New build pic, looking for jetting/timing recommendation |
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New build pic, looking for jetting/timing recommendation |
consolidated |
Feb 5 2012, 04:26 PM
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#1
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Newbie Group: Members Posts: 15 Joined: 14-November 11 From: Texas Member No.: 13,781 Region Association: None |
The 914 Spec series or "H2R Challenge" is starting next week but I feel the car may not be making optimum power. It has dual 40 IDF Webers with stock 155mm main jets, I'm in Austin, Texas 450' elevation.
Any carb and timing tuning advice would be very much appreciated. The motor is s stock 1.7L, rebuilt with new pistons, rings, bearings, crankshaft, seats etc. Compression is good. How much timing advance is optimal for these motors? Thanks! |
jmill |
Feb 16 2012, 09:32 PM
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#2
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Green Hornet Group: Members Posts: 2,449 Joined: 9-May 08 From: Racine, Wisconsin Member No.: 9,038 Region Association: Upper MidWest |
Sounds like lean transition issues. That's why I'm not a fan of the F11. It was designed for a leaner transition. You can get it to work. You can step up your idles and/or main jets to richen up your transition. You'll then have to step up your AC jets above 2.00 to lean your mixture up at higher RPM.
I prefer the F7 because it is designed to give a richer transition. Most don't want to spend the $80 for the new ET's and then more $ on jets. $80 will buy a bunch of jets to get the F11 to work. On a side note you need to check your float level. I've had them set too low right out of the box. That would also cause a lean transition. |
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