Sad to say, I developed a driveline problem about the half-way mark during
the Gold-Rush Challenge open road race that forced me to the sidelines.
After it was over I just loaded the car on the trailer headed back to
MN. What I thought was a rear transmission bearing problem just turns out
to be a yoke problem. Now that I have the trans out of the car it appears
to be alright.
I stayed overnight at Wendover(the 16th) then drove out to the
end of the blacktop around 9:00 a.m. on Monday morning but didn't see anyone
out
there yet so I continued on my way to MN, another year gone by and not making
the salt.
Anyway, the short of this is that I hope everyone had a good race
weekend. I hope to meet you all in person next year.
After pulling the trans, I decided to check the plugs as the motor didn't
run worth a damn for the 50 or so miles that I did make. I just
figured out the power valve in the carb was open most of the time because of
low
vacuum, creating a dead rich mixture at low speed and it is jetted a little
rich to start with. But here at 800 feet MSL and a super Digital 6
ignition system I was getting by with it. I just ran out of time
and it was either load it on the trailer as is or don't bother leaving as I
wouldn't get there on time. What I didn't know was that the whole 55 mile
road race is over 6,000 feet MSL. Guess why it didn't run worth a
damn. It fouled the plugs during all the dinking around with off and on
the trailer and getting up into race formation. They never did clear
out. It wouldn't pull over 145mph.
Now comes the interesting part:
I also just did a compression check. Just to
see how things are doing in there.....
Six of the cylinders build compression between 180# and 185#. I think
this is a good thing.
One builds 235# (number 2 cyl) and another 245# (number 4 cyl). I
think this is not such a good thing in comparison.
By the way, it's a BBC.
So I believe I have a camshaft/valve train problem. I never did
a compression check right after building the motor. It now has about 1500
miles on it. Compression ratio is around 9.8 to 1.
The cam is a Isky "Mega" series hydraulic. I haven't done much else
yet but I suppose I should start checking lobe duration and lift at the
valve. I can't think of any other reason two cylinders would build such a
significant difference in pressure. I suspect valve timing. I'm not
sure of what the usual compression build would be but I just don't think I have
six bad cylinders. The old manual I have indicates a compression
reading of 150# is the approximate range for a compression check for 454
chevys.
Any thoughts out there???????/
--- Gene Halvorson
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