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Author Topic:   Carb tuning help!
Bloose
Gearhead

Posts: 252
From: Milwaukee, WI
Registered: Dec 2001

posted 03-23-2003 09:17 AM     Click Here to See the Profile for Bloose   Click Here to Email Bloose     Edit/Delete Message   Reply w/Quote
Hello all,

I need help!!!

Last year I started with a 650DP but had very bad stumble problems. I later changed to a Road Demon 625 VS. The Demon was much more drivable but I knew there was still problems. I really didn't know if I was rich or lean and when. So over the winter I installed a O2 sensor in one of the headers and built a O2 gauge that I built into the shifter. Anyway I now know I am running into a lean situation.

My Jetting and idle mixure is a bit rich but I think it is fine. I may lean out the jetting later but for now that's not my big problem. The problem seems to be in the accelerator pump circuit or even the PV circuit.

When I do a brake stand it leans out big time. Also when I step on the gas at first it is fine but then leans out until the RPM starts to come up. I had a 31 squiter and tried a 28 squirter to make the squirt longer. That did seem to help but not much. I am thinking about trying a 25 squirter.

When I was trying to work with the Holley I beat my brains out with squirters and pump cams and the problem moved around but never went away. I'm worried that I'm in for the same strugle again this year. Does anyone have some insite they can offers?? I am somewhat lost here. I don't think this should be this hard. Could this be to little stall, to much carb, to little carb???? HELP!!!

My motor and car specs are,

289 +.030
10:1
224 @ .050 .536 lift
E7 heads ported
Headers
X pipe
Performer RPM intake
'68 Fairlane FB
AOD
2000 RPM stall
4.62 gear

TIA,
B-loose

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Moneymaker
Administrator

Posts: 19611
From: Lyons, IL, USA
Registered: May 99

posted 03-23-2003 12:46 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
I don't think you have a squirter problem.
What PV do you have?
Have you checked your air bleads? They may be plugged with crud.

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Alex Denysenko
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www.moneymakerracing.com

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Bloose
Gearhead

Posts: 252
From: Milwaukee, WI
Registered: Dec 2001

posted 03-23-2003 02:10 PM     Click Here to See the Profile for Bloose   Click Here to Email Bloose     Edit/Delete Message   Reply w/Quote
I had the original PV in there which was a 6.5. Today I put in a 7.5. The O2 sensor was not working today, have to check it out. The air bleads look clean and the carb was brand new last year.

Thanks,
B-loose

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Bloose
Gearhead

Posts: 252
From: Milwaukee, WI
Registered: Dec 2001

posted 03-25-2003 07:16 PM     Click Here to See the Profile for Bloose   Click Here to Email Bloose     Edit/Delete Message   Reply w/Quote
No other suggestions guys??? Has anyone else had this many problems with carberation??? Last motor I did long ago I bolted on the carb and it ran great! I may have been able to tune it for more power but it ran very nice right out of the box. This motor is giving me fits, what am I doing wrong, or what am I missing.

B-loose

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