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tornik550 |
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Senior Member ![]() ![]() ![]() Group: Members Posts: 1,248 Joined: 29-January 07 From: Ohio Member No.: 7,486 Region Association: None ![]() |
I am in the process of tuning my car after a rebuild. I have dual weber 40's. My engine is a 2.27L. Everything is going pretty well. I am slowly getting the jetting closer and closer. I was driving around at about 60mph yesterday. The head were hotter than I like (325 degrees). I checked the spark plugs and they were bone white. The main jets were at 160. I increased them to 170 (above 160 I only have increments of 10). With the increase to 170, the car is running very well and the temp at around 60mph cruising is around 275. I sped home, tuned off the car and took out the plugs- bone white. I was quite surprised.
The main jet size sounds high too me. Does it sound high to everyone else? Is it possible that I am needing a high main jet size because of the float level? I have my floats set at 10.5 with the gasket. Any opinions would be greatly appreciated |
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jmill |
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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 ![]() |
If your car were perfect at idle and perfect at mid RPM, but went rich in between (cruizing down the road for example) it's because the idle jets and the main jets are working at the same time. Going to a larger choke would move the main jet up the RPM band and keep them from overlapping. (IMG:style_emoticons/default/agree.gif) If the overlap is minimal or the mains come on just a tad late you can try and correct it with an ET change. F11 = leaner transition - holes are placed higher, diameter of the tube leaves less room for fuel in the main fuel wells. F7 = richer transition - holes are placed lower, smaller diameter to hold more fuel in the fuel wells. |
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