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Paul Merolla 01-06-2010 04:27 PM

Measuring pistons
 
Can anyone tell me where on the piston to measure? It's a Lunati pn 327. Thanks

Chad E532 01-06-2010 04:49 PM

Re: Measuring pistons
 
I typically measure the diameter about a half inch below the oil ring groove perpendicular to the wrist pin on the skirt. This is for a standard cast or forged piston, not sure if this applies to pistons with inserted or coated skirts.
Thanks,
Chad

BillK 01-06-2010 07:28 PM

Re: Measuring pistons
 
Paul,
You really need to call Lunati and ask them. Most piston manufacturers measure about 1/2" up from the bottom of the skirt like Chad said, but there are also some that measure half way up the skirt and at least one that I know of that wants you to measure right below the oil ring groove. You really need to find out from the manufacturer.

Alan Roehrich 01-06-2010 07:53 PM

Re: Measuring pistons
 
Bill is right, call Lunati and ask them where to measure their piston, and also tel them everything about your engine and how you run it. If it is a BowTie block, they need to know. If it is poured, they need to know that too. Tell them what temperature you run it at as well. A little exchange of information could save you a lot of time, trouble, and money.

Paul Merolla 01-06-2010 08:42 PM

Re: Measuring pistons
 
Thanks guys, I'll call 'em. I thought maybe there was a standard answer, like, "Lunati says here, JE says there, etc." I've assembled 2 small blocks for my street car, but never have done it accurately...just had the machine work done and put it together. I want the stocker to be right and lay the foundation for learning to make it go faster.

Alan Roehrich 01-06-2010 09:16 PM

Re: Measuring pistons
 
Even more bad news here Paul. I thought I'd drag out a Lunati catalog and see if I could find the information you needed. Lunati was sold a couple of years ago. The major owner of Comp and a couple of other people bought it from Holley. Where the rub comes in is that the new catalog (2008/2009) does not even show ANY of the old pistons, all they show are the new pistons Wiseco makes for them. A bunch of people at Lunati were let go both before and after the company sold. There may not be any information to be had about those pistons from Lunati. I hope you have a lot better luck than I think you will. Let me know what you find out, and if you need help I'll try to find you some.


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