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Author
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Topic: Backfiring with new cam
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-12-2003 01:32 AM
   
Just installed a new cam and I'm getting backfire through the exhaust. The cam has a tighter LSA (105) than the old one. Nothing else has changed. Installed it straight up. What would be causing the backfire? The extra overlap, or do I need to re-adjust the carb??Thanks for any help. Paul
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MAV
Gearhead Posts: 144
From: Macon,Georgia, U.S.A.
Registered: Mar 2002
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posted 01-12-2003 01:39 AM
WHat kind of engine is it? ... My first wild guess would be that the new cam has a different firing order.
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-12-2003 01:50 AM
It's a Cleveland. Runs ok, just the occasional exhaust backfire.Paul
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two89w
Gearhead Posts: 196
From: sydney australia
Registered: Sep 2002
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posted 01-12-2003 04:20 AM
i thought exhaust backfire was to do with lean carburation
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-12-2003 04:53 AM
I hope that's all it is.. a carb adjustment.
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two89w
Gearhead Posts: 196
From: sydney australia
Registered: Sep 2002
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posted 01-12-2003 05:22 AM
why did you change the cam?
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-12-2003 07:28 AM
Wanted to see what effect a tighter LSA would have. The project was complete and so I was experimenting a little.Paul
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Moneymaker
Administrator Posts: 19704
From: Lyons, IL, USA
Registered: May 99
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posted 01-12-2003 11:29 AM
Exhaust would be rich not lean.
Carb backfire would be due to a lean condition.------------------
Alex Denysenko
Co-Administrator and Moderator NHRA/IHRA/SRA member and licensed Superstock driver
MCA member# 53321
NHRA and IHRA SS/LA National Record Holder '00,'01,'02,&'03
Fleet of FoMoCo products including 88 ASC McLaren Mustang #28
Professional Manwhore
The Barry of BarrysGrrl Quote #1: "I never met a magazine mechanic I liked."
Quote #2: "Make sure brain is in gear before engaging mouth!"
Quote #3: "If you can't run with the big dogs, stay on the porch!"
www.moneymakerracing.com
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itlbrnmoff
Gearhead Posts: 746
From: Indianapolis,IN.USA
Registered: Nov 2002
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posted 01-12-2003 01:30 PM
Too much overlap? Raw fuel being sucked into exhaust valve on intake stroke? Flames shooting out of exhaust? COOOOL  ------------------
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-12-2003 04:32 PM
So Alex is this normal? Or should I be looking for something wrong? It's happening at idle. All I've done is check the timing and run the cam in. I'm yet to adjust idle mixture. Paul [This message has been edited by Clevo377 (edited 01-12-2003).]
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SteveLaRiviere
Administrator Posts: 33371
From: Saco, Maine
Registered: May 99
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posted 01-12-2003 05:24 PM
Is your exhaust lash set too tight?------------------
'70 Mustang Mach 1 - '72 Mustang Sprint - '94 F-150 Please remember our sponsors,
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Clevo377
Gearhead Posts: 312
From: Blackburn, Victoria, Australia
Registered: Nov 2000
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posted 01-13-2003 03:23 AM
Don't know Steve, I need to re-check the lash hot now the cams run in. Shall confirm then.Paul
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