Backfire Issue, need advice.
04-20-2016 | 11:02 PM
#11
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Joined: Oct 2007
Posts: 8,439
Likes: 94
From: yorkville,il
I'm going to throw some old school logic at you on this.
I would base line the timing at TDC with a static timing light...No1 at TDC and the distributor lighting up on the mark. Fire it up and let it run a bit. Then shut down...set up you timing light and start it making sure you don't see the timing mark wobbling around. Loosen the distributor enough to turn it a bit and bring it up to 8* BFTDC.
I think 14* initial is WAY too much. If this works...figure out what you want to have total advance at 3000 and have a distributor guy set those MSD's up.
I had a similar issue with my Vortecs setting them up and at the end of the day I found broken springs in both my distributors. You didn't mention the history of your distributors but if they aren't new...I would guess that's where your problem is.
You might call the guys at DUI in Memphis and talk to them about this. They have a "Small Top" replacement for the HEI's that might fit your set up. I sent my DUI's I bought on Swap Shop here to them and they set them up.
My Dad and Grand Dad always used to say that if air, fuel and spark all get there at the right time it will run good. Knowing that and 18436572,,,there is an answer to your problem LOL !!
Good Luck !!
I would base line the timing at TDC with a static timing light...No1 at TDC and the distributor lighting up on the mark. Fire it up and let it run a bit. Then shut down...set up you timing light and start it making sure you don't see the timing mark wobbling around. Loosen the distributor enough to turn it a bit and bring it up to 8* BFTDC.
I think 14* initial is WAY too much. If this works...figure out what you want to have total advance at 3000 and have a distributor guy set those MSD's up.
I had a similar issue with my Vortecs setting them up and at the end of the day I found broken springs in both my distributors. You didn't mention the history of your distributors but if they aren't new...I would guess that's where your problem is.
You might call the guys at DUI in Memphis and talk to them about this. They have a "Small Top" replacement for the HEI's that might fit your set up. I sent my DUI's I bought on Swap Shop here to them and they set them up.
My Dad and Grand Dad always used to say that if air, fuel and spark all get there at the right time it will run good. Knowing that and 18436572,,,there is an answer to your problem LOL !!
Good Luck !!
04-20-2016 | 11:07 PM
#12
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Joined: Jan 2011
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From: Ocala, Fl
04-21-2016 | 05:11 AM
#17
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Joined: Jan 2011
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From: Ocala, Fl
May send you in the right direction....or at least give you some info.
04-21-2016 | 08:52 AM
#19
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Joined: Oct 2007
Posts: 8,439
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From: yorkville,il
you say you have run locked at 32,and i also used to run locked dist but why do you say 14 initial is not the problem?i believe 14 initial is part of the problem,it needs more.
04-21-2016 | 09:43 AM
#20
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Joined: Oct 2006
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I just talked to Ricky at Holley. He said these carbs will never work. He said to get the 0-80592-s blower carbs. Eric from the blower shop recommended quick fuel 650's. In this application, do you guys worry with the carbs being non marine approved carbs?
Last edited by hblair; 04-21-2016 at 09:48 AM.
