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davis&keen racing
Joined: 01 May 2008
Posts: 80
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 Posted: Mon Jun 11, 2012 8:42 pm Post subject: 6200 flat line |
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| I had my car out this pass weekend for the first time after new engine not as fast as i wanted but they never are but i know there is more in her. I was planning on shifting at 7500 but when i hit about 6200 it flattens out fast like you put your hand over the carb Then bang second and its like you hit a n20 button. I was thinking carb to small but a 850 should be plenty i would think .I have plenty of fuel pressure and pump to feed it, exhaust is big enough cam should be plenty big im kind of scratching my head on this one any thoughts? its a 383 sbc roller motor 13.5 comp |
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b wendling
Joined: 22 Jan 2009
Posts: 129
Location: canton
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| Posted: Mon Jun 11, 2012 9:10 pm Post subject: |
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did u pull the plugs and get a reading? my be to lean and just need more jetting in the carb!
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street car 6.43 @ 106 on 10.5 tire 3500#
malibu best is 5.67
went 5.37 on a 190 shot
5.19 on a 300 shot
it is for sale! |
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davis&keen racing
Joined: 01 May 2008
Posts: 80
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| Posted: Mon Jun 11, 2012 9:18 pm Post subject: jets |
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| yeah i jetted the carb up two jet sizes front and rear and picked up 2 tenths and 4 mph but ran out of time friday so i just left and raced saturday have 81 front 88 rear |
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b wendling
Joined: 22 Jan 2009
Posts: 129
Location: canton
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| Posted: Tue Jun 12, 2012 6:42 pm Post subject: |
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if you picked up that much on jets it sounds like you just need some more....try takin those 81s up some more and leave the 88s for now! maybe try 88 all around....
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street car 6.43 @ 106 on 10.5 tire 3500#
malibu best is 5.67
went 5.37 on a 190 shot
5.19 on a 300 shot
it is for sale! |
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davis&keen racing
Joined: 01 May 2008
Posts: 80
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| Posted: Tue Jun 12, 2012 9:10 pm Post subject: jets |
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| Ok thanks man. |
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GRADYS Performance
Joined: 03 Jun 2011
Posts: 25
Location: 6881 Ridpath RD Grove City, OH
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| Posted: Tue Jun 12, 2012 10:15 pm Post subject: |
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What carb number do you have? That way you can find out the baseline jet size for it.
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GRADYS Performance
Performance Parts & Accessories
Transmission and Rear End Service
614-875-3936 |
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beretta43050
Joined: 13 Jun 2006
Posts: 19
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| Posted: Wed Jun 13, 2012 6:33 am Post subject: |
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| Are you running a hydraulic roller or solid roller camshaft? |
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davis&keen racing
Joined: 01 May 2008
Posts: 80
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| Posted: Wed Jun 13, 2012 7:39 am Post subject: Motor |
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| Solid Roller And not sure of carb number its a older demon ill look at it tonight. |
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