Compression Ratio Question

[RedLineZO6]

I just had the head off my d15 milled 26 thousandths. My friend that did it for me said that I'd have to run 92 octane gas now becuz of the raised compression. I was curious, does anyone know how much this does raise the compression?

Oh... is there a difference between cams or in the heads at all between teh d15 and d16? is there a difference in the block?

I've been thinking about a MPFI conversion... but If there is a difference besides the intake then I might just save my money and go even bigger for the ZC. Becuz the head I have is milled and port and polished now.

[TheSilentChamber]

d16 came in Si, and they had a slightly more aggressive cam. The head itself it the same I believe, I know they are interchangeable. Stay away from ZC, there chunks of japanese shit (thats why they send them all over here). If your looking for a stuff for a mpfi swap I have everything you need except ecu and dizzy listed in classifieds.

[RedLineZO6]

If I do the mpfi conversion I think I wanna get the Venom intake manifold. Are there any bigger bore throttle bodies available for mpfi?

[Hilikus Funkin]

Originally Posted by RedLineZO6

Becuz the head I have is milled and port and polished now.

Who ported and polished it and how much did it cost?

[RedLineZO6]

I friend of mine and his dad did the work. His dad owns a machine shop. He did it for free tho, he said it would have been like $400. He did a 3 angle valve job too. The whole shibbang!

[TheSilentChamber]

I dont know of any larger bore throttle bodies that arnt made for mpfi

[RedLineZO6]

but are there some that are for mpfi?

[crxlvr]

why do you think the ZC's are trash, they are actually very good motors especially for such a cheap price.

[TheSilentChamber]

yeah there are several companies that make larger throttle bodys, but you can usually find a 64mm used ITR cheeper than what an aftermarket one will be and it is the perfect size.

lets see... There neer impossable to find parts for and when you do there expensive as shit, lack of aftermarket parts, not very reliable, and arnt that great performers.

[RedLineZO6]

but does anyone know how to figure the new compression ratio?

[crxlvr]

they can perform just as easily as SOHC VTEC can, as far as relieble, i cant say, my boys ZC has been working fine for years, yea they are a little light on the aftermarket support, but if you know what the parts interchange is for em, then you neednt worry bout it.

[TheSilentChamber]

sorry man I couldnt tell you how to figure the compressoin, try asking you friends dad who owns the machine shop, it wont be more than a point or so though.

I dont personally own a ZC but there a really really common subject on the forums and the common themes are reliablity and trying to find parts.

[mellowboy]

ZC is GARBAGE! I already know 5 ppl that blown on them. We installed one in a crx dx and 2 weeks later and it blow up.

[icE_x]

Originally Posted by mellowboy

ZC is GARBAGE! I already know 5 ppl that blown on them. We installed one in a crx dx and 2 weeks later and it blow up.

omG Geebuz!! D16A6 PWNAGEALICIOUS!

Yes i've heard a lot of ZC horror stories, at that risingsun engines site, they charge more for my d16a6 than they do for the zc, go figure

[mellowboy]

Hey his cams split in half!