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> which 96mm p's and c's to use
mightyohm
post Jan 18 2004, 10:03 PM
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I am building a 2056 out of a 2.0 core.

Which 96mm pistons and cylinders are the current favorite combo on the BBS?

I have heard in the past that people use new 96mm pistons (which kind?) and then bore out 94mm cylinders. I have two sets of core 94mm cylinders, one set is are rusty Kobelschmidt (KS) the other are Mahle (better shape overall but I broke a couple fins when I dropped one (IMG:style_emoticons/default/headbang.gif) ). If I have them bored out can the fins be fixed or am I better off getting another cylinder?

I have also seen brand new 96mm piston and cyl. sets are available new. I recall people saying the quality of the cylinders was not very good. Is this true? An informed source told me they are ok.

I can't afford Nickies, otherwise I would use them.
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ChrisReale
post Jan 18 2004, 10:11 PM
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B-Hole likes the asian made ones. If you have the $crilla, go nickies
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Brad Roberts
post Jan 18 2004, 10:15 PM
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I like them because they are local and cheap. I would prefer to use a bored out 94 with a KB 96 stuffed in it, but I have yet to get my hands on any (we can have them done locally) I sent 2 extra sets of cylinders to Jake so I could stock a set ready to go.


B
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mightyohm
post Jan 18 2004, 10:26 PM
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Is there anyplace local that can bore out 94's?

I guess this one is a goner...


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Brad Roberts
post Jan 18 2004, 10:28 PM
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Yep. Same machine shops who take forever to get our shit done.


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mightyohm
post Jan 18 2004, 10:32 PM
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Ok, I gotcha.

I have another set of heads, Brad. These are 10x better than the last set. No pics yet.

I wonder if those fins can be welded back on?
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Brad Roberts
post Jan 18 2004, 10:36 PM
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Find another set or another cylinder. Dont use that one.. and I wouldnt try to weld them up.


B
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swood
post Jan 18 2004, 11:04 PM
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Are those two broken fins sole cause not to use those C's? I wouldnt think so...but what do I know? (IMG:style_emoticons/default/wacko.gif)
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mightyohm
post Jan 18 2004, 11:15 PM
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Guess I should tell the story...

Pulled off the head and both cyls stuck to it. One came off with some light pounding but the other required me to beat on it with a 2lb mallet for a while. When it eventually broke loose it flew off the bench and hit the concrete floor.

At least this time I did not break my case when I separated it.
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mightyohm
post Jan 19 2004, 11:33 AM
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Does anyone know the typical costs of having 94's bored out to 96's? I will ask the machine shop when I drop off my heads, but I'd like to get a general idea of what to expect.
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swood
post Jan 19 2004, 11:37 AM
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I think I paid 25.00 each. I'd send them to Rimco.
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mightyohm
post Jan 19 2004, 11:39 AM
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What pistons did you use with them?
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swood
post Jan 19 2004, 11:50 AM
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KB 96's. I havent fired it up yet to know how it'll work, but I presume fine.
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mightyohm
post Jan 19 2004, 01:59 PM
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I just spoke to a machine shop that advised me to go with a new set of 96mm JE pistons and new cylinders to match. They did not know the manufacturer of the cyls. Apparently these run about $600.

They did not like the KB's and prefered forged pistons.

Anyone heard of this combo or have any idea who is selling it?
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Jake Raby
post Jan 19 2004, 02:40 PM
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In a street engine KBs are better than JE!!
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McMark
post Jan 19 2004, 02:54 PM
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KBs are good. Your machine shop is over killing. KBs are as good or better than stock. JEs in a normally aspirated 2056 is way more then enough strength. The KBs won't let you down.
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mightyohm
post Jan 19 2004, 03:31 PM
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Do I have to provide the pistons to the machine shop that is boring out the cyls? When people say they run tighter clearances with the KBs what does that mean? Is this set up with the rings or the bore or both?
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rhodyguy
post Jan 19 2004, 03:40 PM
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good question. aircooled.net asks $250 for kb's w/ rings. is there a better price that you have seen?

kevin
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McMark
post Jan 19 2004, 03:53 PM
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You should give them a sample piston with the cylinders. I think Jake mentioned he runs a 0.0015" piston to wall clearance. That's the measurement betwen the piston and the wall without rings.
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swood
post Jan 19 2004, 03:53 PM
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That price seems fine.

You should have one machine shop do the overbore and check the pistons for roundness, and balance with the others, etc. Make sure the skirt clearance is within the recommended tolerance, I don't have this info on me at the moment. The piston vendor should tell you. He'll also give you the recommended gaps on the rings. Should be Hastings with the KB's.
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