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Search: Posts Made By: lr172
Forum: RV-14 Today, 06:44 AM
Replies: 3
Views: 173
Posted By lr172
Resistance decreases as the arm moves up towards...

Resistance decreases as the arm moves up towards full, so voltage observed should increase as you add fuel and mine does this.

Suspect that you may have accidentally selected a parameter in the G3x...
Forum: Traditional Aircraft Engines Yesterday, 02:02 PM
Replies: 43
Views: 1,645
Posted By lr172
Three elements to combustion: compression,...

Three elements to combustion: compression, fuel/air and spark. I see only one listed above. Once both fuel and spark are confirmed it may be time to move on to the mechanical components, but not...
Forum: Traditional Aircraft Engines Yesterday, 01:43 PM
Replies: 43
Views: 1,645
Posted By lr172
Only two mechanical elements to support...

Only two mechanical elements to support combustion with an installation like this. Proper compression and valves opening or closing properly. If you find either of those to be cause here, I will be...
Forum: RV General Discussion/News Yesterday, 10:45 AM
Replies: 4
Views: 183
Posted By lr172
It is possible the the rubber was defective and...

It is possible the the rubber was defective and hardened / shrunk in that spot. If that is the case, re-torquing may not resolve the leak.

Larry
Forum: Traditional Aircraft Engines Yesterday, 10:29 AM
Replies: 43
Views: 1,645
Posted By lr172
Check for continuity of ground on the #1 & #2...

Check for continuity of ground on the #1 & #2 spark plugs with the cyl head. An interesting thing about wasted spark coils, is that the ground return is through the opposite side of the coil and not...
Forum: Traditional Aircraft Engines Yesterday, 08:12 AM
Replies: 43
Views: 1,645
Posted By lr172
I can't see spark as an issue, as the cylinder...

I can't see spark as an issue, as the cylinder wouldn't go dead unless BOTH coils stopped sparking. The likelihood of both wasted spark coils failing to spark only one side of the coil at the same...
Forum: Traditional Aircraft Engines Yesterday, 07:53 AM
Replies: 43
Views: 1,645
Posted By lr172
So, are you saying that after swapping the...

So, are you saying that after swapping the injector wiring between 1 and 3 that #1 continued to stop firing at 2500? Of did the dead cylinder move to #3 at 2500?

I remain convinced that the only...
Forum: RV-14 Yesterday, 07:35 AM
Replies: 7
Views: 721
Posted By lr172
WHile they may be correct that 550* will not...

WHile they may be correct that 550* will not significantly temper the AL further (it is already heated treated), it will not permanently shrink the sheet. Yes, it will expand as it heats up to 550...
Forum: Traditional Aircraft Engines Yesterday, 07:02 AM
Replies: 17
Views: 1,507
Posted By lr172
In my opinion, excessive valve guide wear...

In my opinion, excessive valve guide wear typically stems from poor geometry during any of the several machining processes involved with valve setup. Even poor rocker arm geometry can create it, if...
Forum: RV-10 Yesterday, 06:39 AM
Replies: 4
Views: 475
Posted By lr172
I am in Chicago and would give you a ride, if you...

I am in Chicago and would give you a ride, if you get out this way. I fly to Ames all the time, but not during the summer.

Larry
Forum: RV General Discussion/News 06-17-2021, 12:30 PM
Replies: 6
Views: 388
Posted By lr172
The system is NOT self-purging. You have likely...

The system is NOT self-purging. You have likely introduced air into one of systems. Several potential reasons for that.

Larry
Forum: Traditional Aircraft Engines 06-17-2021, 12:18 PM
Replies: 43
Views: 1,645
Posted By lr172
No bashing. Just reiterating what Robert wrote...

No bashing. Just reiterating what Robert wrote on this forum (he was bragging that his sequential injection is better than all the other batch fire systems on the market) and why it might be a...
Forum: Traditional Aircraft Engines 06-17-2021, 09:50 AM
Replies: 43
Views: 1,645
Posted By lr172
+100 I spent decades in the s/w business. They...

+100

I spent decades in the s/w business. They are pretty conditioned to say that it can't be s/w, as no one else reported the problem. In the s/w world, it is 100%"innocent until proven guilty!"...
Forum: VAF Classifieds (posts in here deleted after 30 days) 06-17-2021, 07:50 AM
Replies: 1
Views: 169
Posted By lr172
I have 6 from an overhaul. 5 are in pretty good...

I have 6 from an overhaul. 5 are in pretty good shape an one is questionable. Engine had a prop strike and ran fine prior to that. All should be in fine shape for overhauling.

Pm if...
Forum: Traditional Aircraft Engines 06-17-2021, 07:28 AM
Replies: 43
Views: 1,645
Posted By lr172
Certainly sunds like a s/w problem or possibly an...

Certainly sunds like a s/w problem or possibly an electronic component failure one the main board . Just need to confirm injector or ignition. Run at 2475 and observe fuel flow. Then run at 2500...
Forum: Glass Cockpit 06-17-2021, 06:54 AM
Replies: 74
Views: 24,473
Posted By lr172
Th cube on my 6 is horizontal, with wire facing...

Th cube on my 6 is horizontal, with wire facing up, with no noticeable tip up at the out end. It has given very stable readings and variance at fill up is consistently around.2 - .3 gph. Been this...
Forum: Traditional Aircraft Engines 06-16-2021, 07:34 AM
Replies: 8
Views: 3,944
Posted By lr172
Pls read post #3. Allen builds engines for a...

Pls read post #3. Allen builds engines for a living.
Forum: Traditional Aircraft Engines 06-16-2021, 07:20 AM
Replies: 17
Views: 1,507
Posted By lr172
I have 750 hours on the 320 in my 6a. I do not...

I have 750 hours on the 320 in my 6a. I do not lean on the ground (though idle mixture is properly set) and have done MANY x-ctry flights in the winter with cht’s around 300* or less. I am lop 95%...
Forum: RV General Discussion/News 06-16-2021, 07:06 AM
Replies: 30
Views: 1,337
Posted By lr172
From an electron flow perspective, they are thr...

From an electron flow perspective, they are thr same. However, if the electrons flow back to the mag via the shield,, that surrounds the center core, it helps to cancel out EMI. The benefits only...
Forum: RV-4 06-15-2021, 08:01 AM
Replies: 8
Views: 419
Posted By lr172
Gear leg fairings are really small rudders. I...

Gear leg fairings are really small rudders. I suspect they are a likely cause of yaw oscillations if they are loose.
Forum: Propellers 06-15-2021, 07:46 AM
Replies: 4
Views: 331
Posted By lr172
Prop manufacturers sometimes provide guidance on...

Prop manufacturers sometimes provide guidance on rpms to avoid in certain engine prop combinations. I would be following the prop manufacturers guidamce, not dynon’s on what rpms to avoid.

Larry
Forum: RV-9/9A 06-15-2021, 07:38 AM
Replies: 11
Views: 1,402
Posted By lr172
The head creates less drag than the nut plus...

The head creates less drag than the nut plus threaded portion. Not a flight safety issue, so no need to account for failure modes.
Forum: RV-4 06-15-2021, 07:29 AM
Replies: 1
Views: 214
Posted By lr172
I believe these planes are designed to fly +/- 1*...

I believe these planes are designed to fly +/- 1* from longerons level in cruise. However, weight loading and speed changes that somewhat. Variances in Actual wing and h stab incidence can change...
Forum: Electrical Systems 06-15-2021, 07:14 AM
Replies: 5
Views: 284
Posted By lr172
Seems way easier to buy a handheld comm to get a...

Seems way easier to buy a handheld comm to get a clearance. You can put the first couple of waypoints or the sid in the gps while the engine is warming up. At most airports, i can get my clearance...
Forum: RV-7/7A 06-15-2021, 07:07 AM
Replies: 24
Views: 1,528
Posted By lr172
Loose bearings can create brake dragging. 25 psi...

Loose bearings can create brake dragging. 25 psi is way too low IMHO. Possible that tube blew and the now deflated tube was causing an excessive bending moment on the wheel , due to the loose...
Forum: RV General Discussion/News 06-15-2021, 06:51 AM
Replies: 30
Views: 1,337
Posted By lr172
The switch should be connecting that grd terminal...

The switch should be connecting that grd terminal to the other terminal with the plead attached and not to the frame ground.
Forum: RV-4 06-15-2021, 06:41 AM
Replies: 8
Views: 419
Posted By lr172
I have built a 6 abd a 10. Both exhibited...

I have built a 6 abd a 10. Both exhibited stability in yaw. They have a tendency to find their position and hold it. A trim tab will move that position around, but will not address your...
Forum: RV General Discussion/News 06-14-2021, 07:46 AM
Replies: 30
Views: 1,337
Posted By lr172
The p lead is noisy and you want to use the...

The p lead is noisy and you want to use the shield to go directly back to the mag to self-cancel, when grounded. One end of shield should connect to the mag ground screw and the other to the other...
Forum: Temp / Test / Misc. (posts deleted after 2 weeks) 06-14-2021, 07:06 AM
Replies: 7
Views: 959
Posted By lr172
Hope you get a tire. I am not sure I would...

Hope you get a tire. I am not sure I would lainch without identifying the root cause of the locked brake. Heat is not a reasonable cause of locked brakes, IMO. Something else is going on. Do you...
Forum: RV General Discussion/News 06-14-2021, 06:44 AM
Replies: 7
Views: 418
Posted By lr172
I use powersonic as well and happy with their...

I use powersonic as well and happy with their performance.
Forum: VAF Classifieds (posts in here deleted after 30 days) 06-11-2021, 07:09 AM
Replies: 6
Views: 450
Posted By lr172
Sorry, but in the US, the law is a combination of...

Sorry, but in the US, the law is a combination of regulations AND interpretations of the court, as well as precedence. A popular example is Roe v. Wade. You will not find a reg that makes abortion...
Forum: RV Ongoing Maintenance Issues 06-10-2021, 06:46 AM
Replies: 4
Views: 353
Posted By lr172
Safe air style quick drains have an oring inside...

Safe air style quick drains have an oring inside them that can leak over time. Simple replacement.

Only fix on the pump is to remve it and install with new gasket.

Larry
Forum: Glass Cockpit 06-10-2021, 06:41 AM
Replies: 13
Views: 1,042
Posted By lr172
Let us know how it works out. I am anxious to...

Let us know how it works out. I am anxious to get the new sw, but also scared away by the reports last round.
Forum: RV-10 06-10-2021, 06:21 AM
Replies: 8
Views: 689
Posted By lr172
I also made fiberglass pads that bridge over the...

I also made fiberglass pads that bridge over the hinge and create a place for a continuous seal.

Larry
Forum: VAF Classifieds (posts in here deleted after 30 days) 06-10-2021, 06:16 AM
Replies: 7
Views: 944
Posted By lr172
I was always told to never mix different weights...

I was always told to never mix different weights of multi-visc oil. It is ok to mix straight weight oils. It is my understanding that the different viscosity modifiers can sometimes have...
Forum: RV-10 06-08-2021, 07:52 AM
Replies: 7
Views: 565
Posted By lr172
May be a pain to dig them out of the pins.. ...

May be a pain to dig them out of the pins.. maybe consider making a mechanical switch instead. Probably a couple of bucks at digikey. Just need to make an adjustable holder.
Forum: RV Ongoing Maintenance Issues 06-08-2021, 07:20 AM
Replies: 19
Views: 820
Posted By lr172
Check he flared seat that the vernatherm nose...

Check he flared seat that the vernatherm nose seals against. These can become deformed and there is an SB on how to reform it. If the nose doesn’t seal, not all f the oil goes to the cooler

Larry
Forum: Traditional Aircraft Engines 06-08-2021, 07:01 AM
Replies: 12
Views: 1,494
Posted By lr172
likely culprits are a bad saender or wiring...

likely culprits are a bad saender or wiring isssues between sender and gauges. Best bet is to install a mechanical, non electric oil pressure gauge and test fly to rule in or out actual low pressure...
Forum: RV General Discussion/News 06-07-2021, 07:56 AM
Replies: 23
Views: 2,339
Posted By lr172
High EGT is a typical sign of retarded timing and...

High EGT is a typical sign of retarded timing and this occurs when only one plug fires. I would replace both plugs in #1 and test. You can even swap plugs from another cyl and see if problem moves....
Forum: RV General Discussion/News 06-07-2021, 07:27 AM
Replies: 20
Views: 4,982
Posted By lr172
I would add to your list vapor lock and other...

I would add to your list vapor lock and other fuel boiling problems, such as carb bowls overfilling and causing over-rich conditions to T/O risks after a quick stop. It seems many T/O accident...
Forum: RV-10 06-07-2021, 07:13 AM
Replies: 12
Views: 1,774
Posted By lr172
I did a long flight at 14K. I was at gross and...

I did a long flight at 14K. I was at gross and was getting 165 KTAS at around 9.2-9.3 GPH. I have std FI, with balanced injectors, and dual EI with variable advance. Otherwise, bone stock 540C4B5...
Forum: RV General Discussion/News 06-04-2021, 06:57 AM
Replies: 51
Views: 4,786
Posted By lr172
IMHO, there are seveal factors that drive that...

IMHO, there are seveal factors that drive that decision. First is a lack of knowledge. That also has several levels. Builder may not understand it is wrong or may not know the different levels...
Forum: RV-6/6A 06-03-2021, 11:14 AM
Replies: 20
Views: 1,239
Posted By lr172
The 6 tiedown ring is welded on to a relatively...

The 6 tiedown ring is welded on to a relatively thin piece of SS and bolted to an even thinner piece of aluminum. A longer arm on this ring could create enough leverage to bend it if you happen to...
Forum: RV General Discussion/News 06-03-2021, 11:09 AM
Replies: 19
Views: 1,144
Posted By lr172
I originally had the GA-35 under the cowl. Had...

I originally had the GA-35 under the cowl. Had two GPS losses (~ 5 minutes each), while IFR (luckly just enroute) and subsequently moved it to the top of the fuse and have not had a problem...
Forum: RV-7/7A 06-03-2021, 09:15 AM
Replies: 9
Views: 527
Posted By lr172
I am a fan of the UREM37BY as it is designed to...

I am a fan of the UREM37BY as it is designed to minimize lead fouling problems. It requires the smaller caps on the harness though.

Larry
Forum: RV General Discussion/News 06-03-2021, 08:58 AM
Replies: 19
Views: 1,144
Posted By lr172
While many don't like this and I understand why,...

While many don't like this and I understand why, all of the FW pass throughs called out in the RV10 manual use a plastic grommet with no other sealing. Clearly this is ok with the kit developer, but...
Forum: RV-10 06-03-2021, 08:48 AM
Replies: 5
Views: 1,363
Posted By lr172
If you still have enough thread engagement, you...

If you still have enough thread engagement, you can extend the heim out a few turns so that the nut clears the hex rod. I believe this was discussed in the manual and that is the reason the heim...
Forum: RV-10 06-03-2021, 08:43 AM
Replies: 5
Views: 1,363
Posted By lr172
rubbing of control rods = bad. YOu need to keep...

rubbing of control rods = bad. YOu need to keep creating clearance until the rubbing ceases. Trust me, you will like that your ailerons move when commanded more than you dislike the idea of cutting...
Forum: Traditional Aircraft Engines 06-03-2021, 08:16 AM
Replies: 10
Views: 477
Posted By lr172
Will take a look at that. However, if I had a...

Will take a look at that. However, if I had a reduced valve lift I would expect the low CHTs to follow into the full power range. Maybe that is a flawed assumption. Once in high power regime, the...
Forum: Traditional Aircraft Engines 06-03-2021, 08:13 AM
Replies: 10
Views: 477
Posted By lr172
Thanks, good idea! I will try that.

Thanks, good idea! I will try that.
Forum: Traditional Aircraft Engines 06-03-2021, 08:11 AM
Replies: 10
Views: 477
Posted By lr172
That is a good point. This weekend I will do...

That is a good point. This weekend I will do another compression check. WHile I didn't do the wobble test on the intake valve, I did observe free movement of the valve when the spring was off. ...
Forum: Traditional Aircraft Engines 06-03-2021, 08:08 AM
Replies: 10
Views: 477
Posted By lr172
Good idea Bill. I will clean out the injector...

Good idea Bill. I will clean out the injector for safe measure. When I posted about spider blockage, it was a friend's plane, not mine and it was brand new, so not surprising to find a bit of...
Forum: RV General Discussion/News 06-03-2021, 07:58 AM
Replies: 44
Views: 4,846
Posted By lr172
Time is a big factor. I was paying a bit more...

Time is a big factor. I was paying a bit more than $900 for the 6A. 1000 hours with 700 in the 6 and IR. I added my son for his PPL training. Full coverage quote was $4500. Decided to go...
Forum: Traditional Aircraft Engines 06-03-2021, 07:33 AM
Replies: 5
Views: 298
Posted By lr172
It is technically a Shear Coupling. It is...

It is technically a Shear Coupling. It is designed of plastic or composites to allow it to shear in half and save your engine gears if the pump ever seized up. Unfortunately heat and time are...
Forum: RV General Discussion/News 06-03-2021, 07:16 AM
Replies: 51
Views: 4,786
Posted By lr172
Looking at your title, it is really sad that if a...

Looking at your title, it is really sad that if a mistake is made and repaired according the manufacturers guidance, someone will pop up and call that persons work "Miserable Quality"

While I...
Forum: RV General Discussion/News 06-03-2021, 07:01 AM
Replies: 33
Views: 5,320
Posted By lr172
V2 would be a popular upgrade ;)

V2 would be a popular upgrade ;)
Forum: Traditional Aircraft Engines 06-02-2021, 12:12 PM
Replies: 10
Views: 477
Posted By lr172
FI - 750 hours since overhaul in '15. Plugs are...

FI - 750 hours since overhaul in '15. Plugs are good. Get a solid EGT rise on both ignitions during runup and EGT is a bit on the low side and would expect a higher EGT if one plug wasn't firing. ...
Forum: Traditional Aircraft Engines 06-02-2021, 10:35 AM
Replies: 10
Views: 477
Posted By lr172
looking for Opinions: Low CHT

Recently, I have noticed that #2 is warming up, after cold start, about 30* cooler than the other cylinders and this is a new development. I can't find anything related to the baffling that has...
Forum: Traditional Aircraft Engines 06-02-2021, 08:31 AM
Replies: 8
Views: 430
Posted By lr172
I have never done it or considered it, but...

I have never done it or considered it, but probably no issue. Assuming you have a more modern sump that uses the oil pickup intregal to the sump casting, there is nothing sticking out more than an...
Forum: RV Ongoing Maintenance Issues 06-02-2021, 08:12 AM
Replies: 10
Views: 1,150
Posted By lr172
You may have something else going on. 13.8 volts...

You may have something else going on. 13.8 volts should be plenty to keep a battery at 90% charge. Clearly something has changed, but is it quite atypical for an alternator to just drop a few volts...
Forum: RV Ongoing Maintenance Issues 06-02-2021, 07:33 AM
Replies: 4
Views: 299
Posted By lr172
With a battery at only 50% charge, I am not...

With a battery at only 50% charge, I am not surprised that there is a slow ramp up in voltage. That is to be expected, as the alternator is pouring a lot of amps into it and this keeps the voltage...
Forum: Traditional Aircraft Engines 06-01-2021, 09:00 AM
Replies: 8
Views: 430
Posted By lr172
The Right Stuff is NOT RTV or at least not...

The Right Stuff is NOT RTV or at least not typical silicone RTV. It is black in color. It is more like construction adhesive than RTV. I would not expect any RTV sealant to work very long in this...
Forum: Traditional Aircraft Engines 06-01-2021, 08:51 AM
Replies: 8
Views: 430
Posted By lr172
While the best course would be to pull the pan...

While the best course would be to pull the pan and replace the gasket, I have a method that has worked for small leaks. Not a great fix, but can stem the tide until the proper repair can be...
Forum: RV Ongoing Maintenance Issues 06-01-2021, 08:44 AM
Replies: 18
Views: 925
Posted By lr172
agreed. $200 is a small price to pay for using...

agreed. $200 is a small price to pay for using fuel flow data to best manage the engine.
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