I get what you're saying. Smooth transitions are always best. On mine, with the 89.6 mm crank and s52 rods, it was only the raised text on the shaft that was making contact every couple revolutions. It was barely anything. All that was really needed was to knock down the text on a lathe. For an even bigger crank do like you said and remove the required material in a localized area then blend it all out to have nice smooth transitions.
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Stroking/boring M20B25/B27: Sectioned blocks show critical dimensions. PICS!
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SILBER COMBAT UNIT DELTA (M-Technic Marshal)
RTFM:http://www.r3vlimited.com/board/showthread.php?t=56950
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dumb question what is the thing between the bearings. it looks like it has been added and looks like a cam lobe of sorts
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 Postdumb question what is the thing between the bearings. it looks like it has been added and looks like a cam lobe of sorts
http://www.ecstuning.com/BMW-E30-325...w_All/ES23062/
Bizarre.
It looks like a fuel pump lobe maybe but M20 never had a mech one....
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unless its something machined to give a smooth surface for a weld. Looks like lots of penetration on either side of the "lobe", a lot of heat has been transferred here.
Edit: Looking at the other pics, it's certainly eccentric in shape. Very weird.Just a little project im working on
- http://www.lse30.com -
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Originally posted by digger View Posthiop used to do a 91mm and 95.8mm for the M50/M52 stokers
BMW made a 93.8mm stroke for the S52 block that went into an ALpina B3 3.3 and B3S
MM do an offset ground S54 crank (s54 has bigger rod bearing so can be offset down the M50 size while increasing the stroke) for M50 based engines with 93mm stroke but adapting the nose is an issue89 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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nevertheless if you buy one from the dealer you get the same thing and the shaft in that area is smaller at D18mm either side of the lobe in the new ones89 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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I have an 89.6mm crank in my 325iX. Used some H Beam rods and it was interfering with the bottom of the cylinder bore. But, I did not have clearance issues with the Aux Shaft, which is slightly different in the iX over the i models. I believe it rotates the other direction from the stock 325i's.
Nando's post and picture of this:
318iS Track Rat :nice: www.drive4corners.com
'86 325iX 3.1 Stroker Turbo '86 S38B36 325
No one makes this car anymore. The government won't allow them, normal people won't buy them. So it's up to us: the freaks, the weirdos, the informed. To buy them, to appreciate them, and most importantly, to drive them.
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Originally posted by LEANE30 View PostTed, did you clearance the bottom of the block or the rods?318iS Track Rat :nice: www.drive4corners.com
'86 325iX 3.1 Stroker Turbo '86 S38B36 325
No one makes this car anymore. The government won't allow them, normal people won't buy them. So it's up to us: the freaks, the weirdos, the informed. To buy them, to appreciate them, and most importantly, to drive them.
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hey guys, one quicky.
is all m20 blocks the same, I mean for boring m20b20 to 84mm? we are having discussion in local forum that if u bore m20b20 to 84mm, then cylinder wally will be very thin
as I remember at start they were all the same, and then just bored to specific engine volume b20/b25 etc
talking about new and old type m20 blocks. (with and without additional water bores between cylinder bores)
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Many in the U.K use 80mm blocks and bore to 84 no problem whatsoeverLast edited by digger; 11-28-2019, 01:23 AM.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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