Modified BMWs

[Kurt in S.A.]

Notice the relationship of the actual 'crank-house' relative to the top of the cylinder spigot and the height of the dipstick on a Type-247 with it's 'starter housing' completely removed:

Never seen a block in quite that form before...thanks...helps a lot.

Kurt in S.A.

[vanzen]

And they are ABOVE the stock starter motor area drain holes that are on either side of the block.

The other side of the "block" contains an "oil condensing chamber"
located to the left of the starter when viewing the engine from the front.
Holes drilled there, without further crank-breather plumbing considerations,
might actually resolve the "stuck breather" scenario that Kurt anticipated.

The only "drain hole" is on the dip-stick side ...

[Major Softie]

But I think the holes on this bike are just cause he likes holes.

Certainly the ones on the front fender are for no other purpose.

[vanzen]

Lightening hole – (civil engineering) An opening cut into a strengthening member
that decreases its weight without significantly altering its strength.



... and a popular motif with "hot-rod" appeal.

[melville]

Is that an NSU in the background?

Yup!


http://www.youtube.com/watch?v=17aqCcHM ... re=related

I thought so! I also considered BMW 700, given the three wheeled company it kept, but those had more of a 'tailfin' back end.

[mattcfish]

But I think the holes on this bike are just cause he likes holes.

Certainly the ones on the front fender are for no other purpose.

I this case, someone needs to take away his drill.

[Deleted User 62]

I this case, someone needs to take away his drill.

I would tend to agree:

[the quinner]

The other side of the "block" contains an "oil condensing chamber"
located to the left of the starter when viewing the engine from the front.
Holes drilled there, without further crank-breather plumbing considerations,
might actually resolve the "stuck breather" scenario that Kurt anticipated.

The only "drain hole" is on the dip-stick side ...

Vanzen's info is true for the 1977 and later blocks...some of the earlier blocks had a drain hole on the right side (rider's right...the non-dipstick side).

[Deleted User 62]

The other side of the "block" contains an "oil condensing chamber"
located to the left of the starter when viewing the engine from the front.
Holes drilled there, without further crank-breather plumbing considerations,
might actually resolve the "stuck breather" scenario that Kurt anticipated.

The only "drain hole" is on the dip-stick side ...

Vanzen's info is true for the 1977 and later blocks...some of the earlier blocks had a drain hole on the right side (rider's right...the non-dipstick side).

Made me look, ya did, and sure enough... one on both sides (R75/5)

[mattcfish]

I this case, someone needs to take away his drill.

I would tend to agree:

Drilling the fins was an old mod I've seen on some vintage racers. It was supposed to improve cooling. Any opinions on that?