|
-
POSTING RULES

-
Donate yearly (please).
-
Advertise in here!
-
Today's Posts
|
Insert Pics
|

08-29-2007, 02:49 PM
|
 |
|
|
Join Date: Jan 2005
Posts: 215
|
|
Interim thanks
You guys are really really great to keep tossing ideas around. Jerry (the guy with the sick engine) is down at the hangar right now, I've emailed suggestions as they've come in. Thanks for helping my friend, even if he is a Glass driver.....
I promise I'll publish an update when (hope hope) this comes to closure. Any other ideas, keep em coming, if you can.
This list rocks!
Art in Asheville.
|

08-29-2007, 03:05 PM
|
 |
VAF Moderator
|
|
Join Date: Jan 2005
Location: Pine Junction, CO
Posts: 655
|
|
This sounds like he has his spark plug leads going to the wrong plugs. This is a classic Jeff Rose installation problem. Runs ok at idle but as the throttle is pushed in it belches smoke, pops and sputters. Have him double and triple check that he has the spark plug leads correct.
__________________
Gary "Seismo" Zilik
Pine Junction, Colorado
RV-6A N99PZ S/N 22993 SOLD
|

08-30-2007, 06:55 AM
|
|
|
|
Join Date: Jan 2005
Posts: 1,025
|
|
Try removing the airbox and any ducting going to the carb and running the engine with the carb inlet straight to an ambient source.
Good Luck,
Mahlon
'The opinions and information provided in this and all of my posts are hopefully helpful to you. Please use the information provided responsibly and at your own risk.?
|

08-30-2007, 10:43 AM
|
 |
|
|
Join Date: Jan 2005
Posts: 215
|
|
Yes to all questions, still no go, but Thanks!
Mahlon-thanks, removing the intake elbow and air box was one of the first things tried.
Yesterday took off all the intake tubes and looked into the spider and up to the valves. No obstructions. It will idle before and after it runs rough. Today will check the valve timing.
As to the ignition leads: great idea but we done it every day for two weeks. Even changed leads. All leads are labeled. It doesn't backfire, etc like crossed leads. it just runs rough. I have experienced crossed leads and this symptom isn't it. Have run it on one ignition, then the other and then both. Same symptoms.
Have been talking to the engine builder the last few days. Nothing yet. Even talked with Klaus Xavier. If you don't know him, he is the guy who gets 260 mph out of an O-200 in a vari-eze. He didn't have any solid ideas either. Yes, this sucks pretty bad. I greatly appreciate the help you have been in looking for answers.
On the vacuum gage idea-That was a really super link on the use of the vacuum gauge. Will give it a go today or tomorrow!
**as an aside to this tale, my pal with the Ill Running Q200 has been starting this blasted engine daily for two weeks with his canopy open, and on Tuesday, the prop blast finally did in his canopy hinges that are bonded into his header tank. So, once he gets the engine running, he has to rip out his glass instrument panel, and grind out and bond in his new hinges, right behind his newly revised wiring. Poor guy.
He is really grateful for the RV support and asks me to thank you all from the bottom of his well worn patience.
Art in Asheville
|

08-30-2007, 11:38 AM
|
 |
|
|
Join Date: Jan 2005
Location: Charlotte, NC
Posts: 1,523
|
|
When in doubt, stick a pair of mags on it and see what happens
sounds like you tried just about everything else, other than getting rid of that ignition (swapping for exactly same doesn't count!!)
__________________
Radomir
RV-7A sold
|

08-30-2007, 11:40 AM
|
 |
|
|
Join Date: Jun 2006
Location: Cincinnati, OH
Posts: 837
|
|
Quote:
|
Originally Posted by atreff
Mahlon-thanks, removing the intake elbow and air box was one of the first things tried.
On the vacuum gage idea-That was a really super link on the use of the vacuum gauge. Will give it a go today or tomorrow!
Art in Asheville
|
The vacuum gauge can really tell you a lot about wassup inside your engine. I learned to appreciate them back in the 60's, or the time era known as B.C. (before computers).
__________________
Ron Leach
RV-7 N713CM reserved VAF # 603
Cincinnati
__________________________________________
"Wish I didn't know now what I didn't know then".
.....Bob Seger
|

08-30-2007, 12:17 PM
|
 |
|
|
Join Date: Jan 2005
Posts: 215
|
|
Thurs update #2 good data on valve timing!
OK, guess what? The valve timing is off. They put a dial timing indicator on the prop and looked at the valves on the #1 cylinder and it's off:
Exh Closes @ 3deg ATDC (supposed to be 14 deg.)
Exh Opens @ 50deg. BBDC (supposed to be 65deg)
Int Closes @ 48 deg ABDC (supposed to be 58)
Int Opens @ 7 deg BTDC (supposed to be 21)
Now comes the hard part, the team is trying to find if it's just one tooth off on the cam gear to crank mesh, bad hyd lifters, wrong hyd lifters, wrong pushrod length, clogged oil galley to hyd lifters.
Needless to say, a call to the builder is the next step.
I'll post more as it comes available. Thanks again for your interest.
Oh, and Jerry has sent for a set of std mags, which are on their way to him tomorrow.
Art in Asheville
|
| Thread Tools |
Search this Thread |
|
|
|
| Display Modes |
Linear Mode
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -6. The time now is 07:30 AM.
|