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Engine - Turbo & Block Modifications and upgrades to maximize your Dodges turbo output & Improving strength and durability - pistons to crank.

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Old 05-13-2004, 05:11 AM   #1
piston clearance and ring gap numbers  
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ebola is keeping the peace
Im rebuilding a 2.2 block. What piston to cylinder best clearance and ring gap would you do for high load/boost engine?
Thanks
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Old 05-13-2004, 10:23 AM   #2
 
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i believe its .0008-.0015 and the ring gap can be anywhere from .014-.020
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Old 05-13-2004, 03:08 PM   #3
 
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Quote:
Originally posted by 89turbomini
i believe its .0008-.0015 and the ring gap can be anywhere from .014-.020

Hi !

Off course !

With Cast piston Tolerance side wall-piston is 0.015-0.018''
Hipereutectics Piston is 0.012 - 0.015''
And Forged Piston is 0.005 - 0.010''

First ring end gap 0.014 to 0.018''
2nd ring end gap 0.012 to 0.014''

For Racing Aplications

Salu2!!!
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Old 05-13-2004, 09:47 PM   #4
 
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I think you've got the cast and forged specs backwords. Forged pistons expand significantly more than cast, so they require a larger clearance.

Really you should use the specs from your piston maufacturer. Every piston is slightly different, depending on the silicon content (along with others of course) the expansion rate can be quite different between manufacturers. For example a Venolia piston requires a large clearance compared to a JE, and they make some noise when cold because of it.
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Old 05-13-2004, 09:50 PM   #5
 
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Exactly, My wiseco's were .0035 tolerance.. very tight for a forged piston.


For ring gap, I had mine gapped at .022 and .018 respectively (boost is a good thing) I do know the fastest 5 sp going has current gaps of .028/.026" (I helped grind and install them). Obviously that car runs like a champ:)
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Old 05-15-2004, 01:43 AM   #6
 
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Quote:
Originally posted by MachineHead
I think you've got the cast and forged specs backwords. Forged pistons expand significantly more than cast, so they require a larger clearance.

Really you should use the specs from your piston maufacturer. Every piston is slightly different, depending on the silicon content (along with others of course) the expansion rate can be quite different between manufacturers. For example a Venolia piston requires a large clearance compared to a JE, and they make some noise when cold because of it.

Hello !!!
the Forged Piston is aleation with carbon in 40% , a expansion rate is minimun front heat (tolerance in combustion chamber up 450'celsius) in comparision a Cast Piston (only thermal resistence a 300'celsius). I think Cast Pistons expand more than Forged pistons .

http://victorylibrary.com/mopar/billet-c.htm

Salu2!!
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Old 05-15-2004, 03:58 AM   #7
 
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if i understand right, engines with higher BMEP's dont like tight piston/ring clearances. Or in other words higher load or piston speed engines has to be "loose" inside comparing to economy/eficient performing engines, am I right? And looser rings/pistons need higher case vacuum? Im going with cast piston now, but Id like to machine the rest for higher piston speed and big low end cylinder pressures.
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Old 05-15-2004, 04:42 AM   #8
 
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Wow, the Wiseco's only need .0035? That about half what the Venolia's need. Out of curiosity where did you get the Wiseco's? I am probably going to use them in my next short block.
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Old 05-15-2004, 08:15 AM   #9
 
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I deal directly with Wiseco. Duane Snyder. ring, pins, keepers and pistons 400 or less.

With that tight clearance.. I'm very comfortable with the larger ring gaps. FWIW, wiseco's are the choice for inducted Honda's...

Last edited by glhsken; 05-15-2004 at 08:19 AM..
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Old 05-15-2004, 08:47 PM   #10
 
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Wiseco also makes a real nice piston for boosted 2.4's. I will have to talk to them and see if they can use the same design with the pin location moved up a bit.

Do you have any contact info for Duane?

BTW- What size pin are you using?
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