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1977 R100s cylinder sleeves
- schrader7032
- Posts: 9065
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 36 times
1977 R100s cylinder sleeves
So you're saying that going past the 2nd oversize won't get rid of the pitting? The R100s were stretching the limit as far as "meat" in the original liners. If you go too far, you'll possibly get warping in the walls where the tunnels are for the four head bolts.
From reading postings from a couple of "gurus" on the Airheads list, they don't recommend trying to resleeve R100 bores. It's dicey at best and there might end up being heat transfer problems. Heat's a big killer on the larger engines. Don't know where you are, but you could check with Ted Porter out in NorCal, Scotts Valley, at http://www.beemershop.com/. He has access to good machinist and is a good Airhead wrench.
Ted and others say the way to go is the Nikasil route...it'll be more expensive than a resleeve or rebore. Finding used parts would reduce the costs. You'll need new jugs and rings. You might even need new pistons because the head in your bike might have a squish band with could conflict with other pistons. This site has some pictures on various piston shapes - http://moragafalconers.org/bmw_pistons/.
Nikasil should be bulletproof for many, many miles. I think what people are saying is that resleeving is a "for now" solution but it will have to be fixed again sooner rather than later.
Give Ted a call and see what he suggests.
Edit: I just rememberd Bore-Tech. A lot of the /2 people have used their services to bore and apply a carbide treatment to the bore for longer life..similar to Nikasil. They list resleeving on their website. Might be worth a call, too.
http://www.bore-tech.com/
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
1977 R100s cylinder sleeves
- schrader7032
- Posts: 9065
- Joined: Fri Oct 27, 2006 3:00 am
- Location: San Antonio, TX
- Has thanked: 3 times
- Been thanked: 36 times
1977 R100s cylinder sleeves
http://rubberchickenracinggarage.com/
Kurt in S.A.
'78 R100/7 '69 R69S '52 R25/2
Fast. Neat. Average. Friendly. Good. Good.
1977 R100s cylinder sleeves
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