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Posted 16 March 2004 - 01:13 AM
When i juice the throttle, i get a backfire out the top of the carb, a very loud pop, my friend thinks that its the carb gasket letting in air and creating a vacuume leak, my professor thinks that its the timing, are they both right or is one the more likely candidate?
Posted 16 March 2004 - 01:27 AM
Congrats!!! Im getting close to being caught up with you.
Posted 16 March 2004 - 01:28 AM
Posted 16 March 2004 - 01:31 AM
Posted 16 March 2004 - 01:33 AM
Also, is there an easy way to verify the cam timing on the ea81? When I first fired up my engine one of the cams was off a tooth and it backfired like crazy.
Posted 16 March 2004 - 01:53 AM
Timing can seem just fine but be a long way off as demonstrated by the "im at 22 degrees and it runs good" post.
I haven't seen mention of a timing light. Its time to break one out since you have the cool new engine and need to really know where you are setting it. Sorry to be a stickler on this one.
Was the carb on another engine before? Like do you have a history with it or is this a new edition to the family too?
Posted 16 March 2004 - 06:13 AM
I never totally diagnosed it, but advancing the timing seemed to get rid of it.
More specifically, when I first got my CIS injected EA82 running, it would pop just like you describe. It would do this mostly when starting to move from a stopped position (throttle open wide, low rpm). I found that if I set the timing around 15 BTDC, the popping happened less and I got more power. 20 degrees gave great low-end power and virtually eliminated the popping, but caused detonation at higher rpm.
I now have my timing set somewhere around 13 degrees, and the popping just gradually stopped after about 1000 miles. I'm guessing it could have been related to my hacked PCV system or the custom work I did on the heads. I'm pretty sure that if I put the timing back to 8 degrees it will lose power and start popping again.
Posted 16 March 2004 - 11:21 AM
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