Originally posted by jeffnhiscars
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m20 cam profiles and rockers
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Originally posted by zaq123 View PostWhat do you think about my post regarding eccenrics? To dial proper lash with HD rockers, eccentric will be pushed in closer to point A on the pic vs. A1 on oem rocker. When at full lift, A moves to B and the change in eccentric's radius is greater vs OEM A1 to B1 resulting in probably greater lift.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by jeffnhiscars View PostThere's a variable that I think could skew the math here. The distance between the eccentric bolt hole and the edge of the rocker tang varies greatly from rocker to rocker. Less so on OE but the range on the new Febis I had was so extreme I sent them back.
Either way the hole locatoion is not consistent89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by zaq123 View PostAlso it looks like cam pad on HD rockers is 2.5 mm longer (about 1.25mm in each direction). Should help with the "run off the cam" vs oem.89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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original post fixed.
if its a custom cam why do you care what the stock cam is? what does the cam card say?89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by digger View Postoriginal post fixed.
if its a custom cam why do you care what the stock cam is? what does the cam card say?
Cam card? er.... I don't think there is one?
The engine builder wanted to know what the specs of an original 323i 731 head are - cam lift, lobe lift, valve lift, rocker ratio e.t.c so he can compare to what is in there now.
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Normally you get a cam card telling you the specifics of the cam so it can be installed correctl especially if it's s custom one. Who did the custom ?89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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Originally posted by digger View PostNormally you get a cam card telling you the specifics of the cam so it can be installed correctl especially if it's s custom one. Who did the custom ?
It was lumpy. Not too bad for daily driving, just right.
So now with the engine rebuild.... the block and crank are fine, and I can get new 323i pistons for $400. But the head was previously welded right across the middle and is corroded.
So I told the engine builder I want whatever new head to be done exactly like the old one, as it was great. But in order to figure out what was done he wants stock measurements to compare the current one to.
I thought it was a schrick cam (or equivalent copy), something that would have a part number on it. But no, nothing!! Its blank.
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ok fair enough89 E30 325is Lachs Silber - currently M20B31, M20B33 in the works, stroked to the hilt...
new build thread http://www.r3vlimited.com/board/showthread.php?t=317505
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