Rebuild Runs Rough
I’m not sure what you mean. It runs poorly at idle and rpm with 18*/33*, if I retard ignition to 10*/23* it runs slightly better. By better I mean it has more consistent vacuum and rpm.
No float bowls, MPFI
Ohchit :(;wrong thread
then back to post 17, for same ending.
I back calculated your total chamber volume from the 9.15 previous Scr and added your estimated 4cc increase to re calculate your Scr to 8.62
I calculated your swept using a 3.94 bore
I grossed your 218/218/115 hydraulic roller cam up by 52 degrees to get a cam with advertised specs of 270/270/115,which, in at 113, equals an ICA of 68 off the assumed advertised.
I plugged in 6150 altitude
The overlap works out to 40* using the assumed advertised specs.
Static compression ratio of 8.62:1.
Effective stroke is 2.47 inches.
Your dynamic compression ratio is 6.68:1 .
Your dynamic cranking pressure is 97.76 PSI.
V/P (Volume to Pressure Index) is 71
This does not match your 110/120 psi, so I assume some erroneous input(s), on my part. But the point is the same; she has a fairly late-closing intake angle, which means the intake manifold, at idle, is gonna be full of air going everywhichaway, which, if the injection timing is too early, will pump a lot of fuel back up into the intake, driving your AFR crazy. If you can, put the computer into open loop, (oh I see you did), and richen her up, and inject as late as you can, to dry up the intake and avoid that backflow.
