As the season draws to a close, I am getting ready to rebuild my CSP '89 CRX
Si engine. While it still runs well, the 120k miles and low oil pressure at
idle when hot is making me nervous!
I've already matched the ports 1 inch into the heads, and I have a header,
K&N filter, adjustable FPR, and other minor external mods.
I've read through the solo rule book, and understand what is there - I can't
up the compression ratio, completely port the heads, Change from a stock
cam, etc. But what about other stuff?
For example:
The service manual shows a 3-angle valve job. Can I do a 5-angle valve
job?
Must I use stock Honda rings, or can I use Total-Seal piston rings?
Do I have to use stock Honda valves and springs?
What else works well?
Does the "if it doesn't say you can, you can't" rule apply all the way down
to gaskets, head bolts/studs, bearings, etc?
Another question: a recent Grassroots Motosports article said that while a
stock D16A6 engine puts out ~100 hp, a 'professionally built CSP' engine
would put out ~130hp. Is this strictly from intake and exhaust mods, or are
there other changes that would be made internally? (30% more horsepower
would definately help!)
Lastly (and maybe too specifically) most of the national-level CRXs I have
seen are using individual throttle bodies and aftermarket ignition/fuel
injection control systems. However, I thought I read that someone recently
won a national event using the stock Honda fuel injection/ignition. Can you
get the power levels required from the stock system?
Thanks for any input...
Ned Buckmaster
P.S. I like your posts AND your school, Jean!
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