92mm or 94mm Cyl.???
92mm or 94mm Cyl.???
I am building the wimpy 1600cc in my buggy. I am starting with a forged chromolly counter weighted scat crank (69mm) I want to get the most power out of it as I can so I automaticly thought 94mm pistons. But then I got to thinking. With the thinner side walls of the 94's will I run into over heating problems. I will be driving my buggy ALOT so I want it to be as dependable as possible. I had a 69 vw beetle that had 88mm pistons and it over heated on me one day and cracked both heads along with several other things. Are 94mm pistons safe for daily driver use? has anyone had any problems out of them?? thanks for the input
The 94's are actually thicker walled than the 92"s, they open up the heads and case more than they do for the 88"s and 92"s.The only concern I had when I did mine, was how close the studs end up being to the edge of the case next to the barrels. Rimco did the work on my case and heads, and they assured me its done all the time. 3 years and havent had any trouble.
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manxdavid
- Posts: 998
- Joined: Fri Mar 26, 2010 5:00 am
- Location: Bull Bay, Anglesey, North Wales, UK. Manxclub #678
94's can mean machining the case very close to the case studs, 92's are quite thin so for reliability over many miles I'd go for 90.5's (ie 1776cc). Size isn't always everything in something as light as a Manx. An Engle W110 cam and dual 40 Webers or Dellortos will fly!!!
"Wise men talk because they have something to say, fools because they have to say something." (Plato)
There are several places, AJ Sims at LowBugget.com being 1 of them, that machines the bottom of the 94mm cylinders to slip into a case that is machined for 90.5/92mm cylinders. It works great. On another note: I have many years of abuse on the engine in my sandrail which is built considerably more then 99% of the engines you will find on the street and the 94mm pistons and cylinders have held up great and I have never had an issue with the case that has been bored for 94's. If the engine is built to responsible specs and tuned properly 94's will last for many years.