Does a vtec head really bump compression?
12-10-2003, 01:55 AM
#11
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Join Date: Jun 2003
Posts: 1,558
Re:Does a vtec head really bump compression?
the y7 and y8 have the same volume for the combustion chamber= 34.0 cc, so the CR will stay the same.
The z6 is abit higher, ~35.5cc, and the 4th gen heads were 38cc.
This is all from memory. I'm gonna throw on my y7 head od my d15b1 = about 10.5~11:1 CR, until my spare motor is ready for tuning. I'm using y7 pistons in a D15b2 with the b2 head to make around 9:1 CR, probably a bit under that. The Mini-me swap on a D16y7 gives no compression bump though, just VTEC.
The z6 is abit higher, ~35.5cc, and the 4th gen heads were 38cc.
This is all from memory. I'm gonna throw on my y7 head od my d15b1 = about 10.5~11:1 CR, until my spare motor is ready for tuning. I'm using y7 pistons in a D15b2 with the b2 head to make around 9:1 CR, probably a bit under that. The Mini-me swap on a D16y7 gives no compression bump though, just VTEC.
12-10-2003, 11:36 AM
#12
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Thread Starter
Join Date: Jan 2003
Posts: 1,183
Re:Does a vtec head really bump compression?
Originally Posted by jung4g
the y7 and y8 have the same volume for the combustion chamber= 34.0 cc, so the CR will stay the same.
The z6 is abit higher, ~35.5cc, and the 4th gen heads were 38cc.
This is all from memory. I'm gonna throw on my y7 head od my d15b1 = about 10.5~11:1 CR, until my spare motor is ready for tuning. I'm using y7 pistons in a D15b2 with the b2 head to make around 9:1 CR, probably a bit under that. The Mini-me swap on a D16y7 gives no compression bump though, just VTEC.
The z6 is abit higher, ~35.5cc, and the 4th gen heads were 38cc.
This is all from memory. I'm gonna throw on my y7 head od my d15b1 = about 10.5~11:1 CR, until my spare motor is ready for tuning. I'm using y7 pistons in a D15b2 with the b2 head to make around 9:1 CR, probably a bit under that. The Mini-me swap on a D16y7 gives no compression bump though, just VTEC.
I'm gonna be doing the swap when I pull my sohc out to build it up. 
12-18-2003, 11:19 AM
#13
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Join Date: Jan 2003
Posts: 4,401
Re:Does a vtec head really bump compression?
well its finished and im amazed at the difference between a a6/z6 head and an a6w/y8 head. the y8 combo has a lot more torque and vtec screams! definatlty worth the 300 bux im spent on the whole thing.
12-19-2003, 08:17 PM
#14
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Join Date: Nov 2003
Posts: 42
Re:Does a vtec head really bump compression?
vtec has nothing to do with the bump in c/r, just the volume of the head, as you can see with the 4th gen heads he was talking about (38cc)
bump for a good topic though, i would of gone z6 head personally, better ports, but the y8 has the most aggresive cam, (shrugz shoulders, it's a toss up)
bump for a good topic though, i would of gone z6 head personally, better ports, but the y8 has the most aggresive cam, (shrugz shoulders, it's a toss up)
12-30-2003, 04:45 PM
#15
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Join Date: Aug 2003
Location: NE-PA
Posts: 4,666
Re:Does a vtec head really bump compression?
I have a d16a6 with d15b1 pistons mated to a z6 head...what would that bump my c/r up to if a stock a6 block and z6 head make over 10:1 c/r, and the b1 pistons are flat tops instead of dish(plus the b1's sit about 8 thousandths over the top of the deck)?
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