>I hope someone out there can help me with my problem and steer me in the
>>right direction. I recently had a motor rebuild and have a Petronix
>installed.
> I find that the engine won't irev ( load and no load) above 4500 RPM. In,
fact it >breaks up at 4500 RPM (no backfire but definitelly a feel that its
holding back >without any steady increase to 5000 or 6000, as it should.
HI List,
Above problem corrected as is my low compression numbers on the newly rebuilt
engine. Here's what it was:
POOR COMPRESSION: Re-timed the cam. Now numbers are 150
BREAK-UP AT 4500 (actually was 3800 RPM): The K&N Mini Plenum
I installed on the HD8 SU for a ram air effect, actually was restricting air
flow and I was bogging down with fuel at throttle (3800 RPM).
Anyway, now I'm very happy with the Supercharger installation and the 6 is
very fast.
I ended up using a velocity stack instead of the K&N Mini Plenum (made for
Weber DGV's) with a short rubber 90 degree elbow attached to a 5 1/2" inch long
K&N cone filter tucked between the HD8 SU and the fender.
Regards,
Seth Glassman
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