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Wed May 21, 2003 6:41 am

I have a 1600cc case that came off a rebuilt motor and i want to build a hi-po motor out of it, i was thinking along the lines of a 2275. Is this possible and if so, what kind of machine work has to be done to it? Would it even be worth it? And cb performance has a "super case" are they even worth the money, what makes it so "super" anyways, what does it do that a stock one can't?

Wed May 21, 2003 7:46 am

Buy a new case! The "supercase" is machined for a "Bored (larger pistons) and stroked (larger crankshaft) engine.
Their cases are usually welded behind #3 cylinder, case savers etc.
Rick

Wed May 21, 2003 7:52 am

what is the purpose of having welds behind #3?

Wed May 21, 2003 8:21 am

re-inforce the walls for #3 to prevent it from blowing out or cracking

Wed May 21, 2003 4:42 pm

Actually, it is just to hit you up for more money. Gene Berg doesn't do it to his engine cases! And does not recommend it. And can actually increase the heat build-up. I've had engines 1776-1835-2016 and presently a 2332 and haven't had any of the cases welded. Right now I am running 9:1 compression in my 2332 daily driver.
Rick

Thu May 22, 2003 6:50 am

what kind of machine work is needed for it to work?

Thu May 22, 2003 7:11 am

Sin, you don't need a new case unless yours has been re-cut a few times, or if you are building a monster that you want to last.

Used cases often get the crank journals out of line and some of them get beat up a little, so they have to be re-machined. This opens up the journal saddles a little, and then you use bearings specific to that oversize to put it back together. Common oversizes are 0.020", 0.040", and 0.060". I personally would not build a stroker out of anything larger than 0.020" over.

The other main issue is the thrust saddle (front main, closest to the flywheel). These can be re-cut to custom sizes (by machine shops that know how) to keep from taking any more material out of them than you have to.

The crank is larger and a stocker case needs to be clearanced for that, if it is an 82mm crank like a 2276 would use.

There are other things that need to be checked, and some other options as well, like rear seal machine and full flow but these are the ones that will most likely need to be done.

Welding cases? I don't see a need if the case is good and you are planning to build a reasonable engine.