[Fredrik Skog]

Hi all,

> I've held a rod / piston assembly from the BMW F1 engine you are referring
> to... pretty cool. Very robust titanium rod but I don't remember the details
> of the piston, 2 ring or 3 - might have to take another look, this time w/ a

A friend of mine has a complete set of these pistons. They are incredibly
well made and strong. the piston crown has a really rigid support under it
with 2 parallell beams on each side of the pin. it has 3 rings. On one
side there is a hole to allow the oil spray nozzle to spray oil into the
crown, wich is hollow. This is made to get rid of the tromendous heat
generated at those boost levels. The piston is not very light due to its
rigid design, I think it's actually heavier than a stock piston.. But in
the turbo era they didn't rev as much as nowadays,
below 10k from what I've heard.

The block they used is the same BMW block design they made in the 60's for
the BMW 1500. I think it was in 1963. Very little is changed over the
years, and the block was used until the late 80's with only minor casting
changes.

We are using these engines in our turbo BMW 2002's with up to 450 HP and
only back yard tuning and carbs. Actually it's the carb that has set
the limit at this point, can't jet them to get more power. Next step
is to EFI it. These blocks and lower ends are incredibly
strong and has no problem whatsoever to handle the 4-5 times
increase in power. Almost everything is stock. crank, rods, block, head.
We only put another camshaft in and lower the CR.


> digital camera. What's even more interesting is that BMW built those motors
> from already "seasoned" high mileage (100k km+) production motors. The block
> is from the 4 cylinder 320i if I remember correctly, and similar to the
> engine used in later e30 M3's.

Yes the block is basicaly the same in the E30 M3, but over the years the
block has become a little lighter due to better casting techniques and
design.

>
> Huge downside is sucking oil by the turbos seals. I'd really suspect 2
> Buterflies Bruce

No problem with a carbon seal on the compressor housing.


/Fredrik Skog

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