mark kibort

I just did a spirited run and came back and measured exhaust collector temps (just after the 4 into 1 part of the header)
385F driver, 405F passenger theroetically, the passenger side is .5 degree advanced .

mark kibort

just checked Cam timing on the passenger side, since that was the only side that was messed with 2 years ago at the track, without actually checking with the guages. turns out, it was dead nuts on where we thought it would be. right at 2mm at 20degrees movement of the crank. did a test at 10 degrees and it was at .8mm. So, if the engine does expand and i really wanted to do 1.7mm as the book suggested, i could go back by moving the cams by about 2 degrees on the crank

We all noticed a different sound of the engine at the track and the dyno showed restored hp when we used the same values for both driver and passenger sides. Anyway, nothing is moved so the car should still hit 320 when we go to the dyno next week.

Ill have to post pictures of how i measure cam timing. i can do it now, pretty repeatable and accurately with a standard micrometer. (if anyone is interested)

mk

H2

I bought the tools to do this from Harbor Freight (all except the mount for the block). If it weren't too big an imposition, I'd appreciate seeing the fotos. It's still not perfectly clear to me precisely how to take an accurate reading with the gauge. Thanks.

Harvey

Bill Ball

Mark: Please do show the photos. Let me know if you want to try the PorKen tool anyway just to see how it compares.

mark kibort

1Here are the pics.

i use the second lifter in from the front of the engine. I line up the micrometer small measuring stick down to the exposed edge of the lifter, resting it against the cam . this allows the distance to be measured to be accurate as it is parallel to the lifter travel. I use the body of the micrometer to line up with the bearing cap bolt .(there happens to be a #8 on it that i use as a aligning mark)
taking the measurement from the same spot, assures an accurate read.
this spot is just to the side of the bearing cap bolt, on the bearing cap body.

first pic is the position on the lifter with the micrometer
then a reading 42.51mm
next pic is the harmonic balancer showing 10 degrees after TDC
then a reading of 43.25
I moved the harmomic balancer to 20 degrees and took a reading
reading is then 44.52

net movement of 2.01mm 20 degrees advance of crank, and just for a data point, .8mm for a movement of the first 10 degrees.

mk