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I hope I did Scott. Turned out that at least #8 exhaust
lobe was flat. I haven't seen the cam yet but the shop doing the
investigating called and just said, "What kind of cam are you going to put back
in?" That was causing the minor backfire out the exhaust and hopefully
the extensive "clicking" I was hearing. As it got worse, it was also
causing a "knock" but only sporatically. At times it sounded like a rod or
a main. It'd idle fine with no noise, then start knocking for maybe 10
seconds, then stop again. Maybe it wasn't anything with the injection or
ignition to begin with - I hope, I hope.
I talked with Harold Brookshire of Lunati (formerly Ultradyne) about a
new cam. He's grinding me one with a larger lobe separation (114º) than
the off-the-shelf Comp cam I had (110º) that he and other FI gurus said would be
better for a FI engine. He also said that most cams tend to close the
valves very quickly and that can sound like rockers out of adjustment.
Makes some sense as I never was really happy with the lifter noise and could
never "seem" to get them adjusted so they'd be quiet. He said his grinds
close the valves about 20%-25% slower/easier so they don't beat the seat to
death and cause the minor clicking.
Hopefully it was just the cam causing the problems. When I had the
700R4 put in, they thought the injectors were too loud but they found my oil pan
and rear main oil leak. Had the oil pan/rear main replaced along with a
new oil pump, then the knocking starts to rear its ugly head. I'd get one
thing done and another would seem to crop up. Hopefully, it's just the cam
this time.
I hope to have the cam next week and put the GR8PMKN back on the
road. I already missed the Goodguys event at Ft. Worth and a couple of
local shows/cruises because of it. I want my car back to drive -
argh!
Dale McIntosh
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