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Search: Posts Made By: lr172
Forum: Electronic Ignition Systems Yesterday, 12:04 PM
Replies: 21
Views: 1,049
Posted By lr172
That is not really correct. As the plane climbs,...

That is not really correct. As the plane climbs, the MAP naturally decreases as the altitude grows, even when WOT. By about 7K, you are below 25" and the advance starts increasing. HOWEVER, most...
Forum: Fiberglass Yesterday, 06:45 AM
Replies: 11
Views: 647
Posted By lr172
curious if you were using the slow or fast when...

curious if you were using the slow or fast when the west stopped curing. I was always told that the slow would do this below 60, but the fast would still cure at much lower temps. Hoping to...
Forum: Fiberglass Yesterday, 06:41 AM
Replies: 11
Views: 647
Posted By lr172
I bought a gallon kit of total boat epoxy. It is...

I bought a gallon kit of total boat epoxy. It is a west knock off and about half the price. Am told the formulation is identical. Has worked well and seems to perform exactly like west.

Larry
Forum: Electronic Ignition Systems Yesterday, 06:21 AM
Replies: 21
Views: 1,049
Posted By lr172
I am not sure that Pmags are anymore reliable...

I am not sure that Pmags are anymore reliable than mags. My hanger neighbor just had his Pmag die and had to send it in for repair at well less than 500 hours. Similar stories out there - search...
Forum: Electronic Ignition Systems Yesterday, 06:18 AM
Replies: 21
Views: 1,049
Posted By lr172
+1 I did not choose Pmags based upon all of the...

+1

I did not choose Pmags based upon all of the information posted here. I chose a more reliable and more tunable solution similar to the SDS system. Another vote to do your homework first.

Larry
Forum: Traditional Aircraft Engines 08-11-2022, 02:09 PM
Replies: 37
Views: 1,484
Posted By lr172
I don't think a plug will get real black after...

I don't think a plug will get real black after only a minute or two of run time. This assumes that the bulk of that 1 hour was before you started richening the mixture from the factory setting.
Forum: Traditional Aircraft Engines 08-11-2022, 02:02 PM
Replies: 37
Views: 1,484
Posted By lr172
At an idle of 800 RPM, a cylinder is firing 26...

At an idle of 800 RPM, a cylinder is firing 26 times per second. Or stated differently, a cyl is firing every 38 milliseconds or .038 seconds. 800 RPM is also ~13 RPS and two cylinders fire on...
Forum: Traditional Aircraft Engines 08-11-2022, 01:57 PM
Replies: 37
Views: 1,484
Posted By lr172
the following assumes no change to idle speed -...

the following assumes no change to idle speed - Idle RPM will be highest and the MAP the lowest at the optimal mixture, which is about 13.5:1 for this type of engine. If he was already richer than...
Forum: Traditional Aircraft Engines 08-11-2022, 11:37 AM
Replies: 37
Views: 1,484
Posted By lr172
He is already richened it so much that the engine...

He is already richened it so much that the engine died. Why are you telling him to go even richer. You guys keep getting hung up on this EGT rise and we have already posted several rational reasons...
Forum: Traditional Aircraft Engines 08-11-2022, 07:02 AM
Replies: 15
Views: 4,397
Posted By lr172
On a good running, broken in engine, there should...

On a good running, broken in engine, there should not be enough oil coming past the exhaust port to collect and leak out of slip joints. If your are getting oil out of the exhaust port, you likely...
Forum: Traditional Aircraft Engines 08-10-2022, 01:20 PM
Replies: 37
Views: 1,484
Posted By lr172
It is not torture on the engine but not...

It is not torture on the engine but not recommended and I avoid it. Look at the hybrid cars, they are constantly starting and stopping without issue. Then again they are not 50's era ditch pump...
Forum: Traditional Aircraft Engines 08-10-2022, 01:12 PM
Replies: 37
Views: 1,484
Posted By lr172
That is good advice and you are wise to think...

That is good advice and you are wise to think this way. Remember, the hotter the engine and the ambient air gets, the leaner you need to be. So if you set the mixture heavily on the rich side...
Forum: Traditional Aircraft Engines 08-10-2022, 01:05 PM
Replies: 37
Views: 1,484
Posted By lr172
Because you went past it while twisting the red...

Because you went past it while twisting the red knob. It is easy to do, as it is a very fine resolution, which is why I recommend a different method. If you kept richening it to the point that it...
Forum: RV-10 08-10-2022, 12:45 PM
Replies: 7
Views: 721
Posted By lr172
Unless you specifically asked them to do it, I...

Unless you specifically asked them to do it, I don't think it is their fault. It's an airplane and there are 100's of other exposed rivets that they were not expected to fill and sand. Can't really...
Forum: Traditional Aircraft Engines 08-10-2022, 11:16 AM
Replies: 37
Views: 1,484
Posted By lr172
Note that the upper lever is not indexed to the...

Note that the upper lever is not indexed to the shaft. That means that most of the units will have a slightly different spacing on the turnbuckle. So the OP cant realistically set it based upon...
Forum: Traditional Aircraft Engines 08-10-2022, 11:02 AM
Replies: 37
Views: 1,484
Posted By lr172
Lean mixtures (leaner than Peak, stochiometric or...

Lean mixtures (leaner than Peak, stochiometric or ~15:1 AFR) show no rise, just a drop as you lean. The richer the mixture from peak/stochiometric, the greater the EGT rise as you lean up to that...
Forum: Traditional Aircraft Engines 08-10-2022, 10:40 AM
Replies: 37
Views: 1,484
Posted By lr172
The RPM rise method is hard because it requires...

The RPM rise method is hard because it requires very small increments of knob spinning to see it after a whole lot of knob spinning just to get into the neighborhood. Very easy to blow right past...
Forum: RV-10 08-10-2022, 09:53 AM
Replies: 86
Views: 26,803
Posted By lr172
Be carefull with that. I made one just like that...

Be carefull with that. I made one just like that for the 6 and it works great, it even held in the EF1 tornado we had this spring. Figured it was a good design and stood the test of time and made...
Forum: Safety 08-10-2022, 07:49 AM
Replies: 6
Views: 646
Posted By lr172
Not sure if most know this or not, but the caps...

Not sure if most know this or not, but the caps must be adjusted to provide a leak free seal. I do not use any lube and my 6 lives on the ramp. Only time I found water was after replacing the...
Forum: Fiberglass 08-10-2022, 07:28 AM
Replies: 25
Views: 1,143
Posted By lr172
Mine was terrible (early 2000 part) and made...

Mine was terrible (early 2000 part) and made worse by sitting in an odd position for a decade. As Bill said, you need to clean up the inside surface, then go to town with a heat gun. Use the heat...
Forum: Glass Cockpit 08-10-2022, 07:08 AM
Replies: 6
Views: 205
Posted By lr172
Don't know about the 27, but on the regular G3X,...

Don't know about the 27, but on the regular G3X, you feed a variable voltage source into the lighting bus input and then you build a configuration that relates voltage to brightness level. There is...
Forum: RV Ongoing Maintenance Issues 08-09-2022, 08:19 AM
Replies: 9
Views: 637
Posted By lr172
seems there are clear and distinct interruptions...

seems there are clear and distinct interruptions in power at somewhat regular intervals. Can't really tell from the data if they are complete stoppage of combustion as the cause or just power...
Forum: Electrical Systems 08-08-2022, 12:16 PM
Replies: 16
Views: 2,427
Posted By lr172
I would look for resistance on the wiring that is...

I would look for resistance on the wiring that is feeding your voltage instrument or any wiring between it and the Alt. Any resistance here will under report the actual voltage being produced by the...
Forum: Electronic Ignition Systems 08-08-2022, 11:35 AM
Replies: 47
Views: 2,184
Posted By lr172
I didn't design it and you may be correct. ...

I didn't design it and you may be correct. However, it needs to sense a magnet pulse, relate that to TDC via an offset of degrees (inferred by time) and deal with error handling on that input, as...
Forum: Electronic Ignition Systems 08-08-2022, 09:55 AM
Replies: 47
Views: 2,184
Posted By lr172
logic and software are mostly synonomous. ...

logic and software are mostly synonomous. Software is nothing more than logic that is read by a microprosessor and converted to binary instructions for the hardware to follow. Logic can also be...
Forum: Electronic Ignition Systems 08-08-2022, 09:49 AM
Replies: 47
Views: 2,184
Posted By lr172
Coils vary a good bit, however, you typically see...

Coils vary a good bit, however, you typically see 2-8 ohms on the primary winding (between the two teminals you mentioned that feed power to the coil) and 10K to 20K ohms on the secondary winding...
Forum: RV Ongoing Maintenance Issues 08-08-2022, 09:15 AM
Replies: 9
Views: 637
Posted By lr172
I suspect a batch of bad gas with water in it. ...

I suspect a batch of bad gas with water in it. Looks like the engine is intermittently losing a significant RPM on each event. Also look at the downward trend on MAP over the chart.

I would check...
Forum: Traditional Aircraft Engines 08-08-2022, 09:06 AM
Replies: 6
Views: 377
Posted By lr172
I thought there was on SB on the 540 slick mags...

I thought there was on SB on the 540 slick mags with the inspection interval reduced from 500 down to 250 or 300 hours. Lots of vibration in the back of the 540.

Larry
Forum: Glass Cockpit 08-08-2022, 08:58 AM
Replies: 6
Views: 391
Posted By lr172
FYI, 15 pin connectors come in both low density...

FYI, 15 pin connectors come in both low density (2 rows) and high density (same shape as a DB-9 with 3 rows) configurations.

Larry
Forum: Glass Cockpit 08-08-2022, 08:48 AM
Replies: 7
Views: 300
Posted By lr172
pretty sure that ATC blasts ALL traffic in your...

pretty sure that ATC blasts ALL traffic in your "cone" and ownship issues (separating your own ship from all of the traffic sent to you) are the responsibility of the receiving equipment. ATC does...
Forum: RV General Discussion/News 08-07-2022, 12:10 PM
Replies: 3
Views: 344
Posted By lr172
While CNC is somewhat generic, in cases like this...

While CNC is somewhat generic, in cases like this it is usually a mill with x,y,z axis'. cutters like plasma laser and water are mostly 2D and not really machining tools. You can't really make 3...
Forum: RV General Discussion/News 08-07-2022, 10:05 AM
Replies: 53
Views: 7,867
Posted By lr172
We got there early on Sunday and watched some of...

We got there early on Sunday and watched some of the craziness on 36. It was amusing to watch. Planes would come down into ground effect 1/2 mile before their assigned dot and then just drag the...
Forum: Traditional Aircraft Engines 08-07-2022, 08:18 AM
Replies: 14
Views: 547
Posted By lr172
Many adjust belt tension via deflection. This...

Many adjust belt tension via deflection. This can be a problem, as most cars have free spans around 10-12" and your lyc alt only a few inches. The shorter the span, the less deflection allowed. ...
Forum: Traditional Aircraft Engines 08-07-2022, 07:34 AM
Replies: 14
Views: 547
Posted By lr172
high pitched squealing for 5-10 seconds after...

high pitched squealing for 5-10 seconds after cold startup is typically caused by a loose belt. Many novices don't have a "feel" for belt tightness. Maybe a good idea to buy a belt tension...
Forum: RV-14 08-07-2022, 07:22 AM
Replies: 9
Views: 765
Posted By lr172
Most are designed for auto under hood...

Most are designed for auto under hood installation and it is not a lot cooler there than in our planes. I have an ND alt in my 6 that has provided 850 hours of trouble free service with no blast...
Forum: Glass Cockpit 08-07-2022, 06:55 AM
Replies: 6
Views: 1,190
Posted By lr172
That 5V output is referenced to the PLX boxes...

That 5V output is referenced to the PLX boxes ground, which should also be the airframe ground. GEA24 also has the airframe ground as a reference. No need for a dedicated ground for this type of...
Forum: RV-12/RV-12iS 08-07-2022, 06:51 AM
Replies: 20
Views: 2,123
Posted By lr172
hardware store and auto store stuff tends to be...

hardware store and auto store stuff tends to be low on the quality scale. Places like digi key or mouser sell lots of quality connectors.

Larry
Forum: Glass Cockpit 08-06-2022, 12:53 PM
Replies: 10
Views: 486
Posted By lr172
Mine is wired like the bottom examples above and...

Mine is wired like the bottom examples above and I get voltages around 1 or 2, but can't really remember as I haven't looked in a long time. Getting readings of 11 makes me think that something...
Forum: RV General Discussion/News 08-05-2022, 10:45 AM
Replies: 53
Views: 7,867
Posted By lr172
There is no way that the FAA would direct an...

There is no way that the FAA would direct an aircraft off a runway on anything but a paved taxiway unless someone else assumed liability for doing so. Too many lawyers at the FAA to allow that. ...
Forum: RV General Discussion/News 08-05-2022, 10:30 AM
Replies: 53
Views: 7,867
Posted By lr172
airport likely has no negligence here. It wasn't...

airport likely has no negligence here. It wasn't the airport personnel that directed them into a concrete block; That was a volunteer working under the guidance of the EAA. Possibly they could get...
Forum: RV General Discussion/News 08-05-2022, 09:23 AM
Replies: 19
Views: 1,890
Posted By lr172
I used this service this year and they are great....

I used this service this year and they are great. I foolishly left my gust lock in the hager. Went there and they gave me a couple 2x4ís and a saw. A few minutes later i had two pieces to...
Forum: Electronic Ignition Systems 08-05-2022, 08:01 AM
Replies: 47
Views: 2,184
Posted By lr172
If the box swap didn't move the problem it is...

If the box swap didn't move the problem it is hard to imagine how the box could be faulty. Further, this is NOT a problem with the interface to the garmin box as you are seeing the rev limiter take...
Forum: RV-12/RV-12iS 08-05-2022, 07:31 AM
Replies: 20
Views: 2,123
Posted By lr172
Why all of this fear mongering for anything other...

Why all of this fear mongering for anything other than "aviation products?" There are 1000's of VERY high quality crimped connectors out there and when used with the proper tools are as good as and...
Forum: VAF Classifieds (posts in here deleted after 30 days) 08-03-2022, 11:00 AM
Replies: 5
Views: 838
Posted By lr172
Yes. A VR for a ford crown victoria from the...

Yes. A VR for a ford crown victoria from the 70's or early 80's. VR166 is a good part #. You will also need a few 1/4" faston connectors and the wiring diagram. Wires can be soldered on if an...
Forum: RV Ongoing Maintenance Issues 08-03-2022, 10:53 AM
Replies: 21
Views: 2,210
Posted By lr172
I use 3/8" Fuel injection hose from the auto...

I use 3/8" Fuel injection hose from the auto store with constant tension clamps. 7 years and 800 hours on the 6 and still look brand new. The FI hose is designed to be impermeable to fuel vapor. ...
Forum: Oregon 08-03-2022, 08:12 AM
Replies: 1
Views: 248
Posted By lr172
climate differences may make this impossible,...

climate differences may make this impossible, however, I rented a two place snowmobile trailer that worked great. It is more than wide enough and it tilts for easy on load off load. Not too...
Forum: RV-10 08-03-2022, 07:27 AM
Replies: 13
Views: 2,759
Posted By lr172
In a proper O2 setup, you should be using push to...

In a proper O2 setup, you should be using push to connect style fittings, so that the tubes are only installed when they are being used. Therefore none of the issues mentioned should be a problem. ...
Forum: RV-10 08-02-2022, 01:39 PM
Replies: 6
Views: 1,159
Posted By lr172
colder air is denser and therefore more O2 per...

colder air is denser and therefore more O2 per cubic measurement; The only components of air that produce power are O2. Therefore, cooling the intake air will net more available HP for any given...
Forum: RV General Discussion/News 07-30-2022, 09:54 AM
Replies: 40
Views: 4,389
Posted By lr172
Glad we got out just a bit earlier. I was the...

Glad we got out just a bit earlier. I was the plane directly in front of the aeroshell birds first time around-departed around 8:15. We did have to sit there for 15 minutes while the 777 took over...
Forum: Traditional Aircraft Engines 07-28-2022, 05:27 AM
Replies: 17
Views: 1,348
Posted By lr172
+1 Buddy had similar symptoms and i put a...

+1

Buddy had similar symptoms and i put a borescope in there and found a burned exhaust valve.

Larry
Forum: Electronic Ignition Systems 07-25-2022, 07:46 PM
Replies: 47
Views: 2,184
Posted By lr172
Happy to hear that you confirmed the source of...

Happy to hear that you confirmed the source of the problem. Good luck with getting the new part in.
Forum: Electronic Ignition Systems 07-24-2022, 07:05 PM
Replies: 47
Views: 2,184
Posted By lr172
EVERY ei system must know the offset between...

EVERY ei system must know the offset between magnet sense and tdc period. If this ei uses a specifically designed piece of hardware with a known offset, great, you can hard code the offset, with no...
Forum: Midwest 07-24-2022, 06:45 PM
Replies: 28
Views: 5,960
Posted By lr172
Arrived this morning. Row 336, 3 in from concrete

Arrived this morning. Row 336, 3 in from concrete
Forum: RV Ongoing Maintenance Issues 07-23-2022, 12:04 PM
Replies: 8
Views: 623
Posted By lr172
While I have never measured underhood temps on a...

While I have never measured underhood temps on a car, I simply cannot imagine them being under 125* outside of winter. Heck, I bet a car with a black hood will have temps close to 120 under the hood...
Forum: RV Ongoing Maintenance Issues 07-23-2022, 11:17 AM
Replies: 7
Views: 767
Posted By lr172
Hopefully that works. My Tig wll run off 110,...

Hopefully that works. My Tig wll run off 110, but I am not sure I could weld 1/8"+ steel (need to melt that current bead, as the crack is likely in the HAZ) without at least a 20 amp circuit. My...
Forum: RV Ongoing Maintenance Issues 07-23-2022, 11:12 AM
Replies: 7
Views: 767
Posted By lr172
Agree completely! I meant to say remove and re...

Agree completely! I meant to say remove and re grease after welding; I should have been more careful with my words. If it comes off without force, it is likely to go back in. If it doesn't come...
Forum: Electronic Ignition Systems 07-23-2022, 10:26 AM
Replies: 47
Views: 2,184
Posted By lr172
OP, be advised that each box has a programmed...

OP, be advised that each box has a programmed position for the sensors and magnets, relative to TDC, based upon the sensors and magnets locations. This is how the box determines TDC and can...
Forum: RV Ongoing Maintenance Issues 07-23-2022, 10:13 AM
Replies: 8
Views: 507
Posted By lr172
Kind of assumed the risk would be somewhat...

Kind of assumed the risk would be somewhat obvious. If you do it in an open area on concrete surface, it is a non event. It doesn't explode or anything. Un compressed gasoline is just like lighter...
Forum: Electronic Ignition Systems 07-23-2022, 08:08 AM
Replies: 47
Views: 2,184
Posted By lr172
It seems unlikely that the sensor moved on it's...

It seems unlikely that the sensor moved on it's own and that implies something hit it, causing it to move. That means likelihood of damage is great. I recommend replacing the sensor. That said,...
Forum: RV Ongoing Maintenance Issues 07-23-2022, 07:40 AM
Replies: 7
Views: 767
Posted By lr172
No guidance on airworthiness, but the issue is...

No guidance on airworthiness, but the issue is really ground worthiness, as the risk is the leg breaking off on a hard landing, though given the pics it doesn't look like that is going to happen any...
Forum: RV Ongoing Maintenance Issues 07-23-2022, 07:25 AM
Replies: 8
Views: 623
Posted By lr172
Two types of heat you are dealing with. One is...

Two types of heat you are dealing with. One is the air temp in the lower cowl area. Very little you can do about that beyond blast tubes that reduce overall engine cooling performance. Insulation...
Forum: Fuel Injection Systems 07-22-2022, 02:11 PM
Replies: 4
Views: 379
Posted By lr172
No. Using the red knob to adjust idle mixture is...

No. Using the red knob to adjust idle mixture is insanely difficult due to the very fine resolution required to do so. You need to do it with the prescribed idle mixture procedure. I am not even...
Forum: Fuel Injection Systems 07-22-2022, 09:19 AM
Replies: 4
Views: 379
Posted By lr172
Need to spend more time on the idle mixture...

Need to spend more time on the idle mixture setting. Good cold, bad hot idle points to a rich idle mixture. If the stumble occurs when accelerating from idle, but not from higher RPMs, that also...
Forum: Electrical Systems 07-22-2022, 08:05 AM
Replies: 11
Views: 801
Posted By lr172
You can add me to that list. Once you analyze...

You can add me to that list. Once you analyze all the details, it doesn't look good, even on paper.
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