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Case Tractors Discussion Forum
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6.5 pistons in a DC

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Nedd

01-09-2006 09:11:46




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Anyone ever tried putting Chevy 6.5 diesel pistons in a DC? Looked at some measurement at the Silvolite website and compared it to a 4" I pulled out of a DC that dropped a valve. It looks like they are just shy of 4 1/16" diameter, .010" less on the pin but almost 1/4" shy on the compression height. My question is do you guys think that 1/4" difference would cause too much heat around the flange for the sleeve and crack? Compression ratios are not a big change from a standard 4" piston. Any input would be interesting.

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Doug Boll

01-09-2006 14:36:46




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 Re: 6.5 pistons in a DC in reply to Nedd, 01-09-2006 09:11:46  
If it fits in the hole, the comp. distance is correct and hooks up to the pin it will work! As the bore got bigger they often shortened the comp distance to maintain the comp. ratio for 70 octane gas. For pulling or performance my practice is to run them to the top of the block or out of the top on CC or L heads.



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Nedd

01-10-2006 10:38:46




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 Re: 6.5 pistons in a DC in reply to Doug Boll, 01-09-2006 14:36:46  
So you don't think the sleeve flange will crack from extra heat. I might try this on another DC I have. Thanks for all the info.



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Camboted

01-09-2006 15:32:31




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 Re: 6.5 pistons in a DC in reply to Doug Boll, 01-09-2006 14:36:46  
Doug,

You seem to know quite abit about this. On a DC, most guys go for the LP head for maximum compression, but I've noticed that the 5505 head has bigger valves. DC Tom says you can palne .100 -.125 off of the 5505, now if I use 4&1/16 M&W type pistons the dome pretty well fills the cavity in the 5505. So, which head do you think will produce more power the propane head or a planed down 5505 with the bigger valves?

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TravisM

01-09-2006 20:19:28




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 Re: 6.5 pistons in a DC in reply to Camboted, 01-09-2006 15:32:31  
The 5575 head is the best flowing head out of all of them. If you can get the dome on the piston to fill the chamber enough to get your compression where you want it, the 5575 head is by far the best. In your situation I would go with the 5505 head, as I think it breaths much better than the lp head, making more power.



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Camboted

01-10-2006 00:13:46




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 Re: 6.5 pistons in a DC in reply to TravisM, 01-09-2006 20:19:28  
What was the applicatin of the 5575 head? I never heard of it.



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Thad

01-10-2006 03:51:52




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 Re: 6.5 pistons in a DC in reply to Camboted, 01-10-2006 00:13:46  
The # is 5576 it has a little more room around the valves so they arnt shrouded so bad. Thad



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Doug Boll

01-10-2006 05:00:23




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 Re: 6.5 pistons in a DC in reply to Thad, 01-10-2006 03:51:52  
The 5576A head was the all fuel head and , yes it has a more open chamber, and yes the 6128A does have smaller valves on the ex. A flat top piston and a 5576 would be the best scenario but it takes over 100ci per hole to get the comp. ratio up to 9to 1 or better for pulling. Remember a dome is the not the best for flame travel and on a long stroke engine this is important. The 5505 is a good all around head. I have a 6128A on my CC puller, it diesels on pump gas when I shut the key off but runs ok on race gas(not stock displacement)

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