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Old 22 Mar 2008, 05:16 am
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Default What Cylinder head can I put on a D15b for max power improvement?

what cylinder head would be the best replacement to improve performance on my Honda D15B engine?what head would improve power? and is there a head that would improve economy significantly?its a D15b Vtec, its got the intake manifold of a d16y8
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Old 22 Mar 2008, 05:31 am
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is it the d15b vtec? if so that head is fine. you can use a z6 or y8 but you'll run into timing problems unless you have an adjustable cam gear. the d15b is like 4.5 degrees off timing with a d16vtec head. i'd just leave it alone.try a nice header and exhaust with a good intake.edit-ok well to avoid timing issues you would have to keep the d15b cam.. which would be like not swapping the head at all. if you swap a z6 head you either need to keep the d15b cam, get an adjustable cam gear, or use a y7 cam gear i think.keep your head.
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Old 22 Mar 2008, 05:46 am
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The D16Z6 head is the same as the D15B, only with a different camshaft. Seriously, the code stamped on the heads are both P08. The D15B's camshaft is slightly more aggressive than the D16Z6's, so it's better. The D16Y8 head does have a smaller combustion chamber, which will increase compression slightly. It will also mess up your timing (robb was correct about that). In the future, if you decide to go further with the performance of the engine and turbo charge it, the D16Y8 heads have been known to lift off the block. You could always use aftermarket ARP head studs, but putting a D16Y8 head on to a D15B (or D16Z6) block requires you to have 9 head studs from the D15B and 1 head stud from the D16Y8.The only heads that would increase fuel economy would be ones that would decrease your horsepower significantly. They also wouldn't mix well with your stock pistons (stock combustion chamber), and would likely run very lean and potentially cause problems, because you'd need the proper ECU for the specific head.You're better off sticking with the head you have.
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Old 18 Feb 2009, 12:12 pm
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Default Re: What Cylinder head can I put on a D15b for max power improvement?

In all honesty, I don't know who this will help, the swap will work just fine, and you can even use the cam shaft from the d15b in the d16y8 head, you will neet that shorter head bolt from a newer d series though. Today is 2-18-09, and we did tis swap last night, it wasn't hard at all, all you need to do is get a v-tec solenoid for the y8 head, and advance the cam timing, about 4 teeth using the stock cam gear, that means make sure the bottom end is at TDC (cylinder#1 at Top Dead Center) you will see an arrow on th right side of the cover behind the cam gear, line up the cam like you would normaly, and then look ad the tooth on the gear that lines up with that arrow, rotate the cam counter clockwise 4 teeth, and put the belt on. you will need a newer distributor to fit properly on the head, but it will run.

I left the d15 distributor on the y8 head, I just driled out one of the ears on the base of it so it wouldn't fall off, and we didn't have one lying around, it started about the second or third try "messing with the distributor position and sounded pretty mean.

I will have before and after pictures up as well as a video verry soon, to prove it.
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