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Registered
Join Date: Nov 2007
Posts: 18
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912 Jugs
What do you recommend for a slip in big bore cylinder kit? NPR no longer available?! Thanks
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12-13-2007, 01:22 PM
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Registered
Join Date: Jul 2007
Posts: 126
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Big Bore Kit
Go for the quality. Use the Shasta P&C big bore kit. Jim
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12-13-2007, 02:17 PM
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Registered
Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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Take your stock cylinders and have them bored and honed for JE's made out of the 4032 forgings. You can take out the factory cast iron cylinders to 86mm and the 912 biral cylinders to 83.5mm max. Nothing like an original german casting. I even take old alloy cylinders and bore and nikasil plate them for a cheap big bore kit that actually cools.
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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12-13-2007, 04:58 PM
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Bussmuggler
Join Date: Dec 2007
Location: Cheyenne Canyon, CO
Posts: 14
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Does anyone have any experience with Swain Coatings? I have a set of mahle 912 pistons and a decent set of cast iron cylinders the I was going to try to use together. Apparently Swain can built up to .004 on the skirts of your pistons. I thought that I could get the pistons coated then have the cylinders honed to fit them like a glove. Anyone have any experience running a setup like this? What kind of clearances should I run using the pistons that are supposed to be used in Biral cylinder in a steel cylinder? Should I shoot for the specs of a motor that normally used cast cylinders or tighter or looser?
Many thanks in advance! This is great resource by the way. |
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12-27-2007, 08:10 AM
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Registered
Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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Yes, Swain does excellent work, same as Calico.
My only qualm with coating the skirts thicker than say, .001" on diameter, is that these coatings are designed to wear, and you may end up with a scenario were you have piston slap after say 15,000-20,000 mi, when these coatings wear down. You treat a biral cylinder with regards to piston to cylinder clearance just as you would with a cast iron cylinder - just make sure to shoot for the tight end of the factory spec when match honing to a coated piston. Typically, when I take used pistons and coat them, it's to match them up to a nikasil cylinder, when normally is taken right back to the original factory spec, so the coating doesn't need to be thicker than my desired .001" on diameter to ensure the proper clearances.
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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12-27-2007, 06:02 PM
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Bussmuggler
Join Date: Dec 2007
Location: Cheyenne Canyon, CO
Posts: 14
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Thanks! I'll be sure to have the machinest shoot for the tight clearance.
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12-28-2007, 11:42 AM
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