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89 crx dohc zc swap. milled head.

Discussion in 'HYBRID -> ED-EF / DA' started by bannacrx, Nov 6, 2007.

  1. bannacrx

    bannacrx New Member

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    i swapped a jdm dohc zc into my 89 gutted crx. ive got a coldair, apexi catback exaust, and bigger plug wires with ngk sparkplugs (no biggie there).

    question is, ive heard that shaving the head 1.4mm will increase the compression to 10.6:1. is this true, and what kind of power gains am i looking at? thanks.
     
  2. blackice90HB

    blackice90HB Senior Member

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    Why? Oh so piontless. Drivability will suck. Put that interior back in your Rex, its not saving you any weight. Boost the ZC and be happy going fast.
     
  3. jlicrx

    jlicrx Senior Member

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    milling the head 1.4mm on the DOHC ZC using a stock head gasket will raise the compression ratio to 10.87:1 - with that much milled from the head, you would have to get adjustable cam gears - unless you add bigger camshafts and a bigger throttle body in order to take advantage of the higher compression ratio, it is going to hurt the performance - you would also need to have a chipped ECU in order to supply more fuel and to better control the ignition timing - you would need to determine what is required for fuel and timing by some serious dyno tuning - having tried all kinds of different higher compression ratios on the ZC (all the way up to near 14:1), i can tell you that you are better off leaving the compression alone
     
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