persistent spark plug fouling
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,027
Bad condenser you usually get an orange spark.
DUI units are HEI. They are really nice pieces:
http://performancedistributors.com/p...-distributors/
DUI units are HEI. They are really nice pieces:
http://performancedistributors.com/p...-distributors/
Last edited by Big2Bird; Dec 17, 2018 at 11:02 PM.
Thread Starter
Instructor
Joined: Jan 2015
Posts: 101
Likes: 2
From: Rochester NY
I think i have a lot to do this weekend. Ill be sure to tell everyone what i found out .....or ask more questions. Early when I had this problem i thought it might be the NEW distributor because the back cylinders where not firing. I thought it was the wire so I replaced them and checked with a spark plug light. The light went on so I figured it was working. But if what im hearing now the spark might no be strong enough? Ill look at the spark of the plug now.
Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Is it just me or the camera angle? But in post #18 the end of the ground strap electrode is missing. It just looks short of reaching the center electrode. Maybe not.
Last edited by HeadsU.P.; Dec 18, 2018 at 08:50 PM.
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,027
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Le Mans Master
Joined: Aug 2017
Posts: 8,336
Likes: 2,809
From: Cool Northern Michigan
Yes, intake does look clean. But I still question the grd strap electrode on that plug. Looks short to me.
Blue Print puts the ALT on the passenger side? H-m-m-m-m. More work for you eh?
Anyway, that plug should still fire, just not normal. If you were expecting fuel to be sitting in the plenum, it evaporates pretty fast. I bet its flooding some how.
Hard to tell but looks like the drivers side of your carb base gasket is stained with fuel, leakage? Maybe?
So. Lets digress:
You have a Eddy intake designed for a Spreadbore carb.
You have an Eddy carb
You have an Squarebore bolt pattern.
You have a 4 Hole gasket or spacer.
You are experiencing a flooding condition.
There must be a clue there somewhere. Not sure you should be using the four hole gasket. Maybe an open style would be better What I am getting at, I wonder if that gasket is blocking any ports on your Eddy carb?
Blue Print puts the ALT on the passenger side? H-m-m-m-m. More work for you eh?
Anyway, that plug should still fire, just not normal. If you were expecting fuel to be sitting in the plenum, it evaporates pretty fast. I bet its flooding some how.
Hard to tell but looks like the drivers side of your carb base gasket is stained with fuel, leakage? Maybe?
So. Lets digress:
You have a Eddy intake designed for a Spreadbore carb.
You have an Eddy carb
You have an Squarebore bolt pattern.
You have a 4 Hole gasket or spacer.
You are experiencing a flooding condition.
There must be a clue there somewhere. Not sure you should be using the four hole gasket. Maybe an open style would be better What I am getting at, I wonder if that gasket is blocking any ports on your Eddy carb?
Last edited by HeadsU.P.; Dec 19, 2018 at 07:36 PM.
Race Director
Joined: Sep 1999
Posts: 11,360
Likes: 382
From: Plano TX
It's a cut back ground strap. Old racer's trick from back in the day. I guess this Autolite comes like that? Anyway, cutting the strap back like that it will still fire, just won't last very long. it also won't make more power that way, go with a regular ground strap.
Thread Starter
Instructor
Joined: Jan 2015
Posts: 101
Likes: 2
From: Rochester NY
A thought. The ignition that im using(dui from high performance) says i can widen the gap to 50,so i figured have the half strap at 45. thoughts? On that note i checked the ohms on the ignition parts and they're all good. The carb is my next move i guess. Check the float and the pressure gauge. Can you think of anything else?
Is my vette stock?? HAHA
Joined: Oct 2015
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From: Im not allowed to tell you
2020 C3 of the Year Finalist - Modified
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there should be a metal adapter plate for the spreadbore to squarebore carb. Edelbrock make it and says its mandatory. Its about 1/8" thick and needs gaskets above and below.
Dr. Detroit
Joined: Mar 2012
Posts: 10,093
Likes: 4,019
From: New Braunfels Texas
Edelbrock wants 6 or below psi. Any more than that blows the needle and overflows the bowls which comes out through the booster on the primary.....flooding the engine.
Put a regulator on it....dial it for 5.5 psi and report your results......
Jebby
Put a regulator on it....dial it for 5.5 psi and report your results......
Jebby
Melting Slicks
Joined: Mar 2008
Posts: 2,666
Likes: 289
From: Spring Park MN
I always cut back my straps on the Top Fuel stuff. The shorter ground strap exposes the spark for better ignition of the hard to light off nitromethane. The ground straps also would stay cooler being shorter and wouldn't burn off as bad. I never saw much improvement in gas engines though, although I have run them like this on the street and they last just as long as regular plugs with long ground straps.
Mike
Mike