jcem

iTrader: (2)

Just wondering if anybody has tried shaving the head on a D17. I know a couple of guys with 4th gen civics who took .03" &.035" off their DOHC ZC heads and got serious power gains. I wonder if it would work on our engines.

Drakkar

it would mean increaseing flow therefore higher power gains, comes down to a more efficient engine

jcem

iTrader: (2)

It bumps up the compression ratio nicely. Just wondering if anybody has tried it here.

ncirom2003

iTrader: (7)

considering the fact our motors are interference motors i wouldnt do it and 30 thousands seams like alot to do. i bet their engines are also but probably more room.
i wouldnt go with .030 though just seems like alot

jcem

iTrader: (2)

Yeah, I hear ya man. .030 on a D17 sounds scary. It would be cool to know how much could be taken off safely, and how the car would react, running premium fuel of course.

ncirom2003

iTrader: (7)

you would have to take the head off and measure the distance from tdc to the top of the block (most of the time there is one almost always) then include thickness of gasket and height from botom of head to lowest point of the valve then subtract from that the lift of the valve but youd have to push the valve in that much and take a measurement from the old lowest point of the valve to the new one and subtract that from the combined measurement of it all and there would be the most that you could safely do it. although its a pain in the *** because you technicallly could do a lil more because of valve timing but then if you get valve float at all your screwed

jcem

iTrader: (2)

Getting the head shaved is nice and cheap, but if new valve spring and retainers are needed, plus the cost of a new gasket and head bolts = not so cheap.

ncirom2003

iTrader: (7)

yea lol although you could probably find someplace a clearance measurement and take your chances shaving off that much

jcem

iTrader: (2)

I think it's safe to say that my warranty would be buh-bye...

ncirom2003

iTrader: (7)

hahaha yea definately, although they probably wouldnt notice

jcem

iTrader: (2)

It's a nice sleeper mod. That one guy has a CRX with the ZC with .035 taken off and kills at the drag strip. Then he opens the hood and all you see is a DOHC non-Vtec.

ncirom2003

iTrader: (7)

thats sick, i was going to buy a crx off a buddy for like 300 bucks but i decided not too.
did he have to run off of anything higher octane than pump gas due to the compression increase?

jcem

iTrader: (2)

He runs pump gas, but pretty much just Sunoco Ultra 94

ncirom2003

iTrader: (7)

oh so it probably hasnt increased it too much, either way thats pretty cool and its definatley a good idea