Rank: Member
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Joined: 4/10/2008(UTC)
Posts: 77
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Have a 350 chev with a Weiand 177 super charger /Demon carby.
Car has been running fine but lately when excellerating has back fired and starts to run rough.Any clues anyone.
Will check plugs when engine cools down
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Rank: Member
Groups: Registered
Joined: 18/10/2007(UTC)
Posts: 897
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check your dizzy and could be a damaged cam lobe
Havent you learnt anything from that guy that gives sermons at church?...Captain whats his name. |
Havent you learnt anything from that guy that gives sermons at church?...Captain whats his name. |
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Rank: Veteran
Groups: Registered, Veteran
Joined: 3/08/2007(UTC)
Posts: 1,902
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1) check timing
2)inspect valvetrain
3) did it ever backfire and then run rough-
inspect powervalve.
WANTED:
-2 14 x 9.25 CSA style Centrelines.
-2 x 15 x 8 Dragway centrelines |
Old holdens brought on the spot, quick decision, cash paid. |
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Rank: Member
Groups: Registered
Joined: 4/10/2008(UTC)
Posts: 77
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backfired ages ago & was then running fine but the Barry Grant Demon carbs are built in such a way that they dont blow power valves but Ill have a look later.
Thanks
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Rank: Member
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Joined: 5/07/2005(UTC)
Posts: 349
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Does it only backfire when you accelerate? If so, is it getting plenty of fuel? Are accelerator pumps working OK?
Have you wound the boost up lately? Is it detonating? Or has it been detonating and damaged anything.
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Rank: Member
Groups: Registered
Joined: 4/10/2008(UTC)
Posts: 77
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yes when starting to eccellerate,accelerator pumps working fine, no its never detonated and I havnt increased boost
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Rank: Member
Groups: Registered
Joined: 14/06/2007(UTC)
Posts: 582
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Causes of backfiring.... lean? Timing? Intake valve damage or not seating?
How consistant is it? My twin-carbed 202 runs beautifully right now, but every now and then when i blip the throttle on downshift it backfires lightly and doesnt rev. Just a weird combo of engine speed, throttle and my tune i guess.
If it happens constantly under accleration, and didnt before, its more of a problem. When was the last time you cleaned out your carby and fuel lines? |
"Silly modern cars" |
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Rank: Member
Groups: Registered
Joined: 4/10/2008(UTC)
Posts: 77
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Thanks guys advanced the timing a bit,changed the plugs and blew out the carby and touch wood all seems good
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