dizzle1

Can you raise the compression ratio on a d15b7?

I was looking at a site called the D series calculator and it seems that if I change the headgasket it will raise compression.

1. So can I use one of these headgaskets? D16Y8 - D16Z6, D16Y8 2 - layer, D17A2 http://www.zealautowerks.com/dseries.html

2. Could I still use 87octane?

3. Just looking for a little more power, but how much I'd like to know?

4. Would this be a bad idea if I turbo it with T3/T4 turbo my max is 8psi?

5. Is the d15b7 a interference engine?

The engine is out of the car and apart I haven't fixed it yet, it was burning oil from worn rings and bad seals.

kris

1- Yes, they will work.
2- Yes, this should still be fine.
3- You are moving .5 points of compression. Not really a big jump, and you will probably not notice the difference.
4- Not if you get it tuned.
5- YES


You could put in PM7 or P29 pistons, and bump your compression up over 10:1 also.

FrankVtec88

Just mill a couple mm's off the head.

PRCIVIC

By this date you should have your engine done and running, but if you are still looking for more power, try to get a D16Z6 head, it is about 36cc combustion chamber, yours is 38cc's, lower number means you will have more compression, you will have about 10.1:1 cr, yours is about 9.1:1 and the intake and exhaust valves are about 1mm bigger than D15B7 valves, then get a P28 ecu from e-bay (about $100) that's what we call mini-me, lots of power gain. For this combination i recommend you to use at least 91 oct. gas. Think about it!

azntech630

if u wanna raise ur compression ratio u need a dome type piston, and the whole valve train. My advice is if this is ur daily car just stick to OEM.

kris

There are other ways of raising the compression ratio besides these you have listed.

Dweezil6969

Y8 HG and enjoy a slight boost for almost no work

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