Stroking/boring M20B25/B27: Sectioned blocks show critical dimensions. PICS!

[digger]

It’s common to bore 80mm bore blocks to 84mm.

[gabriel1982]

So, boring out an M20B20 is out of question?! At most using the crank from an M20B23 to make it 2.3 liter?!
Bmw should have build an inline six like Ford Barra 4.0 😁😎

[Northern]

I see all pics in the OP clearly, no watermark.

* this is with the photobucket hotlink fix though.

All photos by Lorin, digger, and tinkerputzer work for me. A couple broken links from others.

[digger]

When I look at the original pictures I can still make them out clearly with the watermark on them. Is this not the case for others viewing ?

i see yours with the PB watermark.

[LJ851]

So, resurrecting this thread - any chance pictures can be rehosted so they are visible again? Sent from my iPhone using Tapatalk

When I look at the original pictures I can still make them out clearly with the watermark on them. Is this not the case for others viewing ?

[n3nyongmini]

i redid mine

Thanks a mil Sent from my iPhone using Tapatalk

[digger]

So, resurrecting this thread - any chance pictures can be rehosted so they are visible again? Sent from my iPhone using Tapatalk

i redid mine

[n3nyongmini]

So, resurrecting this thread - any chance pictures can be rehosted so they are visible again? Sent from my iPhone using Tapatalk

[digger]

https://www.e30zone.net/forum/viewtopic.php?f=54&t=277867&p=2954961#p2954961

[digger]

Many in the U.K use 80mm blocks and bore to 84 no problem whatsoever

[abit]

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)

[downforce22]

Ted, did you clearance the bottom of the block or the rods?

Clearanced the bottom of the block. I believe the larger bore wouldn't have caused a problem but I bored after clearancing for the rods. It was very minimal, like one piston cleared on the whole rotation, but the second one didn't.

[LEANE30]

Ted, did you clearance the bottom of the block or the rods?

[downforce22]

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:

http://www.r3vlimited.com/board/showpost.php?p=2493301&postcount=42

[digger]

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 ones