107 questions compression.

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May 1, 2017 | 05:29 PM

brad75raiders

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Road Warrior

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From: Oakdale Ca.

107 questions compression.

IF I have stock heads .30 head gasket and JE 107 10.25:1 Pistons running Andrews 57h in my 2007 Dyna what is my compression. I ask because the 57h is supposed to like 10.1 to 10.2. anyone have an Idea? How much more could one expect tq wise for heads done as well

May 1, 2017 | 06:09 PM

misfitJason

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From: Florida

I don't know exactly because you are missing some info. Here is a link to play with

http://www.bigboyzheadporting.com/TwinCamComp.htm

May 1, 2017 | 06:14 PM

brad75raiders

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Road Warrior

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From: Oakdale Ca.

I have put numbers in but don't know we're to add the piston compression

May 1, 2017 | 07:35 PM

tonebone_79

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From: Bethlehem, PA

Pistons are most likely -1.5cc, but what are the heads cc's and how far in the hole are the pistons?

May 1, 2017 | 10:11 PM

brad75raiders

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Road Warrior

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From: Oakdale Ca.

dont know yet need to pull everything apart and find out its 96 now

May 2, 2017 | 06:34 AM

prodrag1320

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From: deland,florida

you need to find out the dome cc,and actual chamber cc.HP/TQ increases from getting the heads done will depend on who does the heads.a good porter can set your heads at any compression ratio right at 10.25-1 if that's what your looking for

May 2, 2017 | 09:38 AM

djl

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From: san antonio

Quote:

Originally Posted by tonebone_79

Pistons are most likely -1.5cc, but what are the heads cc's and how far in the hole are the pistons?

The OP does need head CCs and deck height but for planning purposes can use 85cc for chamber volume and .005"-.007" for deck height. However, sounds like the JE pistons are domed to generate 10.25 static, probably 6cc. The link you provided to the BB compression calculator should help the OP answer his own questions.