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Old 05-03-2013, 03:54 PM
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4.127" bore which pistons?

Hello everbody,

I bought a very nice Dart SHP block from ebay. As the bore has been torqueplate honed to 4.127" for the previous pistons I'm wondering what piston diameters I can just for this bore? Do I only choose from pistons with a advertised 4.127" bore or also 4.125" etc etc? As this is going to be a high compression engine I want it to be in the ballpark with everything so I'm not going to cut corners.
Thanks!

Greetings Peter

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Old 05-03-2013, 04:24 PM
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what engine are you building?The piston manufacturers may have what you want in stock.You may still have to hand fit them,,,
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Old 05-03-2013, 05:27 PM
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Dial bore measure it in multi locations and all the bores,Wisco will made anything you want.Tell them what you measured and what you have/want.
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Old 05-06-2013, 10:03 AM
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Thank you, as I already have a dail bore gauge I'll check every bore on 3 locations so I can email the measures to some manufacturers.

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Originally Posted by vinniekq2 View Post
what engine are you building?The piston manufacturers may have what you want in stock.You may still have to hand fit them,,,
I'll just start a new topic on this subject as I have some other questions

Greetings Peter
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Old 05-06-2013, 10:31 AM
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Quote:
Originally Posted by Peer81 View Post
Hello everbody,

I bought a very nice Dart SHP block from ebay. As the bore has been torqueplate honed to 4.127" for the previous pistons I'm wondering what piston diameters I can just for this bore? Do I only choose from pistons with a advertised 4.127" bore or also 4.125" etc etc? As this is going to be a high compression engine I want it to be in the ballpark with everything so I'm not going to cut corners.
Thanks!

Greetings Peter
If the bore is in finished condition; that is finish honed and ready for assembly and measures a true 4.127 inches, then you would need to provide an operating clearance, a 4.125 piston would furnish a .002 inch clearance which is in the ball park but on the tight side. This would require a high silicon piston that is more thermally stable whether hyper-eutectic cast or 4032 forged, even then this would be a street clearance. For a hard woking engine, race or industrial you'd want to rehone the block to open up the bore another .001 to .0015 inch with the 4.125 piston.

Bogie
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Old 05-06-2013, 03:58 PM
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Here's a chart from Keith Black pistons backing up what oldbogie says about a KB hypereutectic (high silicon, cast) piston.....
http://www.kb-silvolite.com/assets/kb_installation.pdf

By the way, if any of you guys want to learn about pistons and rings, this is a good source for quality information.....
http://www.kb-silvolite.com/features.php
http://www.kb-silvolite.com/news.php
http://www.kb-silvolite.com/article.php

Last edited by techinspector1; 05-06-2013 at 04:05 PM.
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