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Search: Posts Made By: rocketbob
Forum: RV-10 10-06-2017, 10:28 AM
Replies: 11
Views: 750
Posted By rocketbob
Pressurize with compressed air and use a...

Pressurize with compressed air and use a mechanic's stethoscope to look for the leaks. Works well.
Forum: Traditional Aircraft Engines 09-15-2017, 11:56 AM
Replies: 43
Views: 3,838
Posted By rocketbob
Check for a loose fuel injector.

Check for a loose fuel injector.
Forum: Fuel Injection Systems 09-26-2014, 05:51 AM
Replies: 123
Views: 35,410
Posted By rocketbob
Like I said previously in this thread the notion...

Like I said previously in this thread the notion of restricting the WOT throttle travel is a bandaid approach to fixing the incorrect hole pattern at WOT throttle.
Forum: RV General Discussion/News 09-25-2014, 09:15 AM
Replies: 34
Views: 8,753
Posted By rocketbob
A well tuned fuel delivery system has a huge...

A well tuned fuel delivery system has a huge impact on temps. Had a 3878 carb on 55BC and it would hit 420 on takeoff, and would settle down to 350 in cruise. With the Rotec am now seeing 390...
Forum: Fuel Injection Systems 09-25-2014, 09:04 AM
Replies: 123
Views: 35,410
Posted By rocketbob
If you increase the fuel pressure by extending...

If you increase the fuel pressure by extending the spring, when the local pressure inside the venturi at WOT there may not be enough pressure differential to draw enough fuel out of the spray bar...
Forum: Traditional Aircraft Engines 09-25-2014, 05:30 AM
Replies: 3
Views: 1,710
Posted By rocketbob
First off Don is likely correct so I don't see...

First off Don is likely correct so I don't see why you should be stumped. A hair dryer cannot create an air pressure difference. Bottom line: remove all intake tubes and put new gaskets on but do...
Forum: RV General Discussion/News 09-23-2014, 12:43 PM
Replies: 33
Views: 7,294
Posted By rocketbob
One other thing to inspect for. Carbon arcing...

One other thing to inspect for. Carbon arcing covered under the soft distributor brush AD.
Forum: RV General Discussion/News 09-23-2014, 12:18 PM
Replies: 33
Views: 7,294
Posted By rocketbob
I have the T-100 tools and have never found it...

I have the T-100 tools and have never found it necessary to use to do a 500 hour check. Unless the seals are leaking I wouldn't pull the rotor. Mainly one is checking the timing, for evidence of...
Forum: Traditional Aircraft Engines 09-23-2014, 09:29 AM
Replies: 90
Views: 22,511
Posted By rocketbob
I really don't understand why Lycoming doesn't...

I really don't understand why Lycoming doesn't get in sync with the rest of the world and use circlips to retain the pins.
Forum: Fiberglass 09-23-2014, 08:24 AM
Replies: 26
Views: 10,385
Posted By rocketbob
I learned from a friend who used to be a training...

I learned from a friend who used to be a training instructor at Scaled Composites that the best way to prep for additional layers is to sandblast rather than sanding. I did this when I had to add...
Forum: RV-9/9A 09-23-2014, 05:42 AM
Replies: 16
Views: 3,475
Posted By rocketbob
The Champion stuff is ****. It dries and gums up...

The Champion stuff is ****. It dries and gums up the threads. A good nickel antiseize is a better choice.
Forum: RV-7/7A 09-22-2014, 02:20 PM
Replies: 4
Views: 1,138
Posted By rocketbob
That does not sound plausible to me. Anything...

That does not sound plausible to me. Anything that has pulleys with belts that slip make a horrible noise and/or leave lots of rubber dust on everything. I suspect you had a bad field wire...
Forum: RV General Discussion/News 09-20-2014, 07:20 AM
Replies: 10
Views: 1,699
Posted By rocketbob
Baffling that normally doesn't rub in the cowling...

Baffling that normally doesn't rub in the cowling rub when subjected to negative g loads.
Forum: Traditional Aircraft Engines 09-19-2014, 12:07 PM
Replies: 90
Views: 22,511
Posted By rocketbob
That much aluminum off of all pistons should have...

That much aluminum off of all pistons should have been clearly visible in the filter. It shouldn't take oil analysis to see that there was something not good going on in the engine.

Unless of...
Forum: Traditional Aircraft Engines 09-19-2014, 08:49 AM
Replies: 90
Views: 22,511
Posted By rocketbob
9 or 9.5:1 is a good compromise. 10:1 seems to...

9 or 9.5:1 is a good compromise. 10:1 seems to be hard on things like prop shank bearings. I have friends that have run 10:1 and they run into those sorts of problems.

I would not put the...
Forum: Traditional Aircraft Engines 09-19-2014, 07:43 AM
Replies: 90
Views: 22,511
Posted By rocketbob
The evidence the pistons got hot is judging by...

The evidence the pistons got hot is judging by the amount of oxidized (burned) oil residue stuck to them.

What I do is measure the piston and aim to hone 0.004" cylinder larger than that. Since I...
Forum: RV General Discussion/News 09-19-2014, 07:25 AM
Replies: 4
Views: 1,353
Posted By rocketbob
The 2000lb pad scales from scales4planes.com are...

The 2000lb pad scales from scales4planes.com are nice, well built, and accurate. Our EAA chapter bought a set of three and was just using them yesterday.
Forum: Traditional Aircraft Engines 09-19-2014, 05:37 AM
Replies: 90
Views: 22,511
Posted By rocketbob
It got hot. Why? Dunno but have the cylinder...

It got hot. Why? Dunno but have the cylinder shop measure. Armed with this knowledge I would get all four cleaned up and a set of new ECI pistons and rings.
Forum: Traditional Aircraft Engines 09-18-2014, 07:00 PM
Replies: 90
Views: 22,511
Posted By rocketbob
here's my hammer

Home-made out of a piece of pipe, short piece of aluminum, and some allthread.

https://lh5.googleusercontent.com/-GyAXJSeXVeU/VBt-Q6hWAPI/AAAAAAAA55o/H2Hxkd7t3Nk/s2048/IMG_2580.JPG
Forum: Traditional Aircraft Engines 09-18-2014, 09:09 AM
Replies: 90
Views: 22,511
Posted By rocketbob
I thought we were talking about an O-360 that...

I thought we were talking about an O-360 that doesn't have the ports drilled (Ney mod). So in this case yes its as simple as taking the pipe plugs out and putting the squirters in since its an...
Forum: Traditional Aircraft Engines 09-18-2014, 08:23 AM
Replies: 90
Views: 22,511
Posted By rocketbob
No case has to be apart.

No case has to be apart.
Forum: Traditional Aircraft Engines 09-18-2014, 07:52 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Disagree with you on this point. If there is...

Disagree with you on this point. If there is more oil pressure particularly at low RPM there is going to be more oil escaping around the main and rod bearings, hence more oil to splash. The same...
Forum: Traditional Aircraft Engines 09-18-2014, 05:45 AM
Replies: 90
Views: 22,511
Posted By rocketbob
I don't think that's a good idea! I have a tool...

I don't think that's a good idea!

I have a tool that will press the pin out.
Forum: COMM 09-17-2014, 06:27 PM
Replies: 21
Views: 2,270
Posted By rocketbob
If you can get your hands on an antenna analyzer...

If you can get your hands on an antenna analyzer or a network analyzer that would be your best bet. Most ham radio guys have one. I've solved a lot of antenna problems with mine.
Forum: Traditional Aircraft Engines 09-17-2014, 06:23 PM
Replies: 90
Views: 22,511
Posted By rocketbob
That is something I would certainly do but most...

That is something I would certainly do but most mechanics don't have the tools to do this job. Even with a bore gauge in hand its somewhat of an art to measure effectively with it. I always have a...
Forum: COMM 09-17-2014, 02:06 PM
Replies: 21
Views: 2,270
Posted By rocketbob
Not necessarily. Localizer frequencies are much...

Not necessarily. Localizer frequencies are much higher than VOR frequencies. If the antenna is not properly coupled to the airframe it will have different capacitive and inductive reactance and may...
Forum: Traditional Aircraft Engines 09-17-2014, 01:50 PM
Replies: 90
Views: 22,511
Posted By rocketbob
The RV-6 I fly had some similar cylinder problems...

The RV-6 I fly had some similar cylinder problems last year, but no piston scuffing. I reconditioned #2 and 4 (hone, new rings, new pistons, recut the valve seats) but due to the amount of pitting...
Forum: Traditional Aircraft Engines 09-17-2014, 12:11 PM
Replies: 90
Views: 22,511
Posted By rocketbob
If it was a lubrication failure it likely...

If it was a lubrication failure it likely happened when the first start occurred after the engine was assembled, or from starts with low oil pressure. #4 gets the least amount of oil flow. Might...
Forum: Traditional Aircraft Engines 09-17-2014, 11:49 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Or piston slap due to excessive piston/bore...

Or piston slap due to excessive piston/bore clearance.
Forum: Traditional Aircraft Engines 09-17-2014, 11:34 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Nah you would see trash in your oil filter if...

Nah you would see trash in your oil filter if this were the case.
Forum: Traditional Aircraft Engines 09-17-2014, 11:31 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Actually no, a lot of times its the hottest...

Actually no, a lot of times its the hottest cylinder(s) that tend to have issues and the rest can be fine. These engines are simple and robust and give the operator plenty of warning if something's...
Forum: Traditional Aircraft Engines 09-17-2014, 11:24 AM
Replies: 90
Views: 22,511
Posted By rocketbob
You're right its probably detonation as I get the...

You're right its probably detonation as I get the two mixed up easily.
Forum: Traditional Aircraft Engines 09-17-2014, 08:58 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Pistons are machined out of round...they're...

Pistons are machined out of round...they're actually oval by a few thousands. I don't see how a cylinder can be honed out of round.

Wondering if you had preignition. Sure looks like it by the...
Forum: Traditional Aircraft Engines 09-17-2014, 07:16 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Its normal to see some scuffing but not up to the...

Its normal to see some scuffing but not up to the ring lands like that. Its an area I think definitely benefits from a piston coating like ECI puts on their pistons.
Forum: Traditional Aircraft Engines 09-17-2014, 05:24 AM
Replies: 90
Views: 22,511
Posted By rocketbob
Oh no you shouldn't have!. The guy with the...

Oh no you shouldn't have!. The guy with the webinars says so! :p

Looks like it got hot, why I don't know, but stick a fork in the piston, its done.

The cylinders and valves look like they will...
Forum: RV General Discussion/News 09-16-2014, 07:22 AM
Replies: 9
Views: 2,249
Posted By rocketbob
Thomas @ g3i once told me the temp rise of a...

Thomas @ g3i once told me the temp rise of a stock 540 sump was 1.5 deg. F.
Forum: RV General Discussion/News 09-15-2014, 12:28 PM
Replies: 14
Views: 2,865
Posted By rocketbob
I have the unfortunate experience in extracting...

I have the unfortunate experience in extracting occupants out of a flipped 6A on our airport so I guess that qualifies me to answer this in an informed manner (have a scar to prove it.) Fortunately...
Forum: RV General Discussion/News 09-12-2014, 02:39 PM
Replies: 8
Views: 2,124
Posted By rocketbob
I have a Reprap i2 a friend of mine built, and as...

I have a Reprap i2 a friend of mine built, and as I'm typing this it is printing a part for the new and much larger 3D printer I am in the process of building.

The few things I've printed for the...
Forum: Traditional Aircraft Engines 09-11-2014, 07:06 PM
Replies: 8
Views: 1,956
Posted By rocketbob
Yes combustion tech has been around awhile, but...

Yes combustion tech has been around awhile, but I'm wondering if TRW actually makes a piston for a Lyc.
Forum: Traditional Aircraft Engines 09-11-2014, 01:26 PM
Replies: 8
Views: 1,956
Posted By rocketbob
Where do you get these pistons from Smokey?

Where do you get these pistons from Smokey?
Forum: Traditional Aircraft Engines 09-11-2014, 05:46 AM
Replies: 18
Views: 5,998
Posted By rocketbob
Which Aeroshell? In all the cases I've seen its...

Which Aeroshell? In all the cases I've seen its been 100W, 100W plus and 15W50, but not ran on one uniquely the whole time. Perhaps the antiwear additive has something to do with this.
Forum: RV General Discussion/News 09-10-2014, 05:52 PM
Replies: 15
Views: 4,343
Posted By rocketbob
I agree completely however the regs are the regs,...

I agree completely however the regs are the regs, and reality "is what it is." That said there are a lot of older airplanes flying that get a cursory look over and unbelievably bad issues get...
Forum: Traditional Aircraft Engines 09-10-2014, 05:35 PM
Replies: 18
Views: 5,998
Posted By rocketbob
Cork gaskets have nothing to do with Aeroshell...

Cork gaskets have nothing to do with Aeroshell varnish...the entire inside of an engine fed with Aeroshell oil will look like that. Not so with Phillips X/C.
Forum: Traditional Aircraft Engines 09-10-2014, 11:17 AM
Replies: 18
Views: 5,998
Posted By rocketbob
Vlad I'm curious if you used Camguard...?

Vlad I'm curious if you used Camguard...?
Forum: Traditional Aircraft Engines 09-10-2014, 07:00 AM
Replies: 18
Views: 5,998
Posted By rocketbob
No I'm not a believer in additives and won't be...

No I'm not a believer in additives and won't be until there is good data to indicate any of them work. I'm talking about aviation-specific additives. I have seen the varnish so thick from Aeroshell...
Forum: Traditional Aircraft Engines 09-09-2014, 04:50 PM
Replies: 18
Views: 5,998
Posted By rocketbob
Aeroshell oil does that. Doesn't hurt anything...

Aeroshell oil does that. Doesn't hurt anything but if you ran X/C it would be perfectly clean.
Forum: Traditional Aircraft Engines 09-09-2014, 05:43 AM
Replies: 18
Views: 2,879
Posted By rocketbob
Sure sounds like the barrel valve is scored and...

Sure sounds like the barrel valve is scored and leaking air, no amount of fiddling as you've already done will get it to idle right.
Forum: Fuel Injection Systems 09-07-2014, 06:21 PM
Replies: 123
Views: 35,410
Posted By rocketbob
There are two versions of the spraybar the second...

There are two versions of the spraybar the second one having larger holes. Could very well be he has the one with smaller holes.
Forum: Fuel Injection Systems 09-07-2014, 11:14 AM
Replies: 123
Views: 35,410
Posted By rocketbob
If the mixture is correct acceleration is not a...

If the mixture is correct acceleration is not a problem.
Forum: Fuel Injection Systems 09-07-2014, 10:33 AM
Replies: 123
Views: 35,410
Posted By rocketbob
Gabor you will need to drill out the holes in the...

Gabor you will need to drill out the holes in the spraybar as I mentioned. Rotec is of no help in this process. I have traded numerous emails with their support staff and they simply do not...
Forum: RV General Discussion/News 09-05-2014, 05:12 PM
Replies: 20
Views: 4,131
Posted By rocketbob
The best bet is to go to Lycoming's school. Some...

The best bet is to go to Lycoming's school. Some of the things they teach are behind the times. They still recommend against LOP operation which to me is almost like believing the world is still...
Forum: COMM 09-05-2014, 12:51 PM
Replies: 12
Views: 2,404
Posted By rocketbob
And if you did that...poof. Actually both...

And if you did that...poof.

Actually both transmitters would go poof.

The XCom radios I servce have varactor diodes in the output section to isolate the receiver any time the transmitter is keyed...
Forum: COMM 09-05-2014, 11:49 AM
Replies: 12
Views: 2,404
Posted By rocketbob
No you can't have splitter on a transmission line...

No you can't have splitter on a transmission line because the impedance gets screwed up.
Forum: COMM 09-05-2014, 11:05 AM
Replies: 12
Views: 2,404
Posted By rocketbob
There will be a negligible loss in the splice and...

There will be a negligible loss in the splice and its usually specified in db by the connector manufacturer. It will be minor so having a loop of wire where you can get to it with your handheld is a...
Forum: Traditional Aircraft Engines 09-05-2014, 07:49 AM
Replies: 10
Views: 2,510
Posted By rocketbob
The click could be the movement of the rings as...

The click could be the movement of the rings as one cylinder comes back up on compression. Since there's no oil it may be more noticeable. Normally you don't hear it on a Lycoming but on some...
Forum: Traditional Aircraft Engines 09-04-2014, 05:46 PM
Replies: 30
Views: 8,521
Posted By rocketbob
I have read his articles and I disagree with some...

I have read his articles and I disagree with some them. Some I agree with but certainly not the recent one a few months ago where he discusses cylinder fastener fatigue, and to avoid cylinder...
Forum: Traditional Aircraft Engines 09-04-2014, 01:10 PM
Replies: 13
Views: 3,402
Posted By rocketbob
If a metal particle is not large enough to be...

If a metal particle is not large enough to be caught by the filter and visible to the naked eye its not worth worrying about.
Forum: Traditional Aircraft Engines 09-04-2014, 11:26 AM
Replies: 30
Views: 8,521
Posted By rocketbob
Yep mechanics are dumb and we should avoid fixing...

Yep mechanics are dumb and we should avoid fixing things because of our inherent stupidity.:p
Forum: Safety 09-04-2014, 11:03 AM
Replies: 22
Views: 6,916
Posted By rocketbob
About five years ago I was helping a friend work...

About five years ago I was helping a friend work on a F8F Bearcat. It caught on fire and literally there were flames all the way back to the cockpit. Fortunately he KEPT ON CRANKING and prevented...
Forum: RV-6/6A 09-04-2014, 10:56 AM
Replies: 6
Views: 1,794
Posted By rocketbob
There's no reason you can't run throttle,...

There's no reason you can't run throttle, mixture, and carb heat thru one hole. I did this on my Rocket and it made for a much cleaner install that is easier to fireproof.
Forum: Glass Cockpit 09-04-2014, 10:51 AM
Replies: 32
Views: 7,753
Posted By rocketbob
I think the D180 is a good choice but my...

I think the D180 is a good choice but my experience with it has been that the screen brightness in sunlight is not as good as some of the newer systems.
Forum: RV-9/9A 09-04-2014, 10:49 AM
Replies: 52
Views: 12,729
Posted By rocketbob
The 9 would be a good airplane to put a Precise...

The 9 would be a good airplane to put a Precise Flight speed brake on. With a FP prop its hard to kill altitude. I did a few test flights of a wood prop fixed pitch 9 and had to go to idle on...
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