I have a D15 in a 89 crx that I need to rebuild.
This car is raced in SCCA GTL I have raced all year on a stock motor.
The only upgrades that I have done are MPFI - remapped ECU to low temp 6800 rpms, high temp 7500 rpms - Si trans also running racing fuel 110 to 114.
This engine has run very well until the oil filter came lose.
Engine is running but I want to go through it.
This is what I was thinking (low cost ok) going with new stock rods-pistons 20 or 40 over, balancing, New valve springs - valves and after market cam.

Any help or Idea's?

 

Any idea's?????????????

Come on somebody

 

Those engines are free from any busy engine swap shop. (I know one guy who used to push them out the back of the shop at night and hope they'd disappear by morning.) And they ought to be a dime a dozen at any respectable salvage yard. I'd save some money and just get a used one rather than do a rebuild. They make more power when they're loose, anyway. A nice junkyard motor with a valve job should make more power than a fully rebuilt engine with the same bore and compression. Mine went 250,000 on the street with NO issues before I swapped in a B18...

Questions:
• Have you raised the compression on your current motor? If not, you're losing power running high-octane race fuel. 91/92 should be more than enough for that motor with up to 10.5 to 1 compression.
• Are you still running the stock dual injector manifold and ECU? How did you reprogram it for higher RPM? Z-Dyne is the only ECU I've heard of for that vintage and it's for the D16 with 4-injectors. I tried using a D16 ECU on a D15 in a dyno session once, and it was not pretty. It ran, but the injection pulses were all wrong and the power curve looked like a relief map of the Himalayas: rough country.

On the other hand, if you want to rebuild it just for the experience, I totally understand. I doubt it'll save you any money or gain you much power, though.

 

I want to make more HP

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mike84 CRX-GTL &raquo;</TD></TR><TR><TD CLASS="quote">
The only upgrades that I have done are MPFI - remapped ECU (out of a 90 civic Si) to low temp 6800 rpms, high temp 7500 rpms - Si trans also running racing fuel 110 to 114.
This engine has run very well until the oil filter came lose.
Engine is running but I want to go through it.
This is what I was thinking (low cost ok) going with new stock rods-pistons 20 or 40 over, balancing, New valve springs - valves and after market cam.

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Yes I will go up on the compression.
Do I need to stay with stock rods & pistons & balancing, The max RPM will be 7500?