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Old 03-04-2013, 02:55 PM   #1
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1993 Mazda RX-7
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Default 1000whp LS3 piston to wall and ring end gap recommendations

Iím running std bore (4.065) JE forged pistons with the rings that came with the kit and a new GM aluminum LS3 block, PT7675CEA turbo.

Please recommendation piston to wall and ring end gap clearances.

Thanks for your help,
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Old 03-04-2013, 03:20 PM   #2
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Maybe this will help but my diamond pistons 2618 aluminum say to run .004 for NA applications and when adding a power adder to add .001-.003 to that depending on power level..

I will be running between .005-.006 on my Iron 347 build shooting for 700hp on the street, and hopefully 850-900 race gas at the track..
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Turbo 347 build here http://ls1tech.com/forums/forced-ind...t-machine.html
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Old 03-04-2013, 03:51 PM   #3
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I run .005 on my builds with great results
2006 GTO 10.7@131.7 12psi 23deg 1.8 60ft. Back to stock.
1998 z28 camaro twin 62/66 precision turbos, forged 365 e85. PB 9.02 149mph
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Old 03-05-2013, 01:29 PM   #4
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Originally Posted by 9sectruck View Post
I run .005 on my builds with great results
Thanks, I was thinking the same!
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Old 03-05-2013, 01:47 PM   #5
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Thumbs up

On my new setup, after talking to may people and Wiseco, we went with 0.0055" piston to bore wall. My setup is in my sig. We will be heating the engine (oil and coolant) to 160* before each startup and using the LSX block. One thing they did tell me that they would have recommended .005" on my setup if I was using an Aluminum block. (1500hp goal) To be totally safe on mine (wider than called for), we did .030" ring gap.

Some things to think about are what your doing with the engine (street/race/hot lapping?)... N/A or power adder (sc or turbo), high or low IAT's? (W2A or no intercooler), how much boost and what fuel? Get a list together and call JE Pistons tech line. Tell em all the details and they should be able to get you close (the card that comes with the pistons is only for reference in my opinion as there are many assumptions made to come to those tolerances they give), but the .005 talked about by others should be close/safe/in the ball park.

Good Luck

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Last edited by BMF_Racing; 03-05-2013 at 01:57 PM..
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Old 03-05-2013, 01:47 PM
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