webers with CIS pistons????????
02-16-2004, 11:43 PM
#1
Track Day
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webers with CIS pistons????????
Steve, (and the rest of you rennlisters)
I have a 3.0 out of a 1983 SC. I also have a set of 40IDA-3C webers that I could install on this 3.0. Can I just bolt these on and gain the HP benefit of carbs vs the cis WITHOUT tearing the engine apart and replacing the cis pistons??? Or would you just stick with the cis for now??
Thanks,
Mark
I have a 3.0 out of a 1983 SC. I also have a set of 40IDA-3C webers that I could install on this 3.0. Can I just bolt these on and gain the HP benefit of carbs vs the cis WITHOUT tearing the engine apart and replacing the cis pistons??? Or would you just stick with the cis for now??
Thanks,
Mark
02-17-2004, 03:02 AM
#2
I have that setup on a 2.7L. I've never dynoed it, but it feels and sounds great! You need to jet the carbs rich.
A better cam and pistons would be a better but more spendy idea.
A better cam and pistons would be a better but more spendy idea.
02-17-2004, 02:32 PM
#3
RL Technical Advisor
Hi Mark:
Yessir, with the correct manifolds and fuel pressure regulator, these are a bolt-on. You might need to rejet the carbs for your SC motor, depending on what motor they came off of.
You do not need any internal changes unless you want more "zip". In that case, your CIS pistons will limit what cams you use.
Lastly, the success of any carburetor installation lies solely with how carefully these are set up. Fuel pressure (3.5 psi), precise float levels, and fuel filtering are VERY critical to making these run right. Webers are totally intolerant of any dirt or contaminants and the floats must be spot-on.
Yessir, with the correct manifolds and fuel pressure regulator, these are a bolt-on. You might need to rejet the carbs for your SC motor, depending on what motor they came off of.
You do not need any internal changes unless you want more "zip". In that case, your CIS pistons will limit what cams you use.
Lastly, the success of any carburetor installation lies solely with how carefully these are set up. Fuel pressure (3.5 psi), precise float levels, and fuel filtering are VERY critical to making these run right. Webers are totally intolerant of any dirt or contaminants and the floats must be spot-on.
