meritlover
31-08-06, 10:51 AM
hello.
last weekend i did some work on my 1.2
i skimmed 40 thou off the head to increase the compression ratio, ground the valves, opened up the head all round the ports and carefully matched the manifolds to the enlarged ports. the over lap was something like 1.5mm in places so it was pretty restrictive.
the problem is now that theres a huge flat spot during accelleration, the car wants to go and the top end is so much quicker than before, it has more torque and is more responsive. over all (except for this hesitation)
when some choke is applied it cleares and pulls better, this would suggest to me that the carburation is slightly lean or the accelleration pump is not supplying enough as the flow drops across the venturi at WOT.
what should i do? should i go changing jets or adjusting the mixture screw? or will i start by increasing the stroke on the accellerator pump?
thanks in advance
last weekend i did some work on my 1.2
i skimmed 40 thou off the head to increase the compression ratio, ground the valves, opened up the head all round the ports and carefully matched the manifolds to the enlarged ports. the over lap was something like 1.5mm in places so it was pretty restrictive.
the problem is now that theres a huge flat spot during accelleration, the car wants to go and the top end is so much quicker than before, it has more torque and is more responsive. over all (except for this hesitation)
when some choke is applied it cleares and pulls better, this would suggest to me that the carburation is slightly lean or the accelleration pump is not supplying enough as the flow drops across the venturi at WOT.
what should i do? should i go changing jets or adjusting the mixture screw? or will i start by increasing the stroke on the accellerator pump?
thanks in advance