How to raise compression??
05-28-03, 10:16 PM
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How to raise compression??
hey guys!!
how're you all doing? i just bought my 1st FR 3 days ago, picked up a '88 FC NA w/ a blown motor for $500 (Canadian... so like $370 US). i'm very excited about it
i've built a few hondas before, but i've always wanted a an FR. of course, rotory is a bonus i've never worked on a rotory motor, and don't know much about it. anyways, i was wondering, how do you raise the compression ratio on a rotory? w/ a traditional engine, you can change the pistons, shave the head... etc. but what about a rotory?
how're you all doing? i just bought my 1st FR 3 days ago, picked up a '88 FC NA w/ a blown motor for $500 (Canadian... so like $370 US). i'm very excited about it
i've built a few hondas before, but i've always wanted a an FR. of course, rotory is a bonus
i've never worked on a rotory motor, and don't know much about it. anyways, i was wondering, how do you raise the compression ratio on a rotory? w/ a traditional engine, you can change the pistons, shave the head... etc. but what about a rotory?
05-28-03, 10:34 PM
#2
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you can't unless you buy special rotors maybe (I don't think they are even made though).
Since you own an 88 (series 4), you have a 9.4:1 ratio, but if you put in series 5 rotors (from a 89-91 car), you get a 9.7:1 ratio, but then you need a different counterweight and stuff.
I wouldn't bother if I were you. If you are going to pull the engine apart just port it and leave the rotors alone. You can push a lot of power out of a ported rotary. You can also swap in a tII engine and driveline if you want serious power.
Since you own an 88 (series 4), you have a 9.4:1 ratio, but if you put in series 5 rotors (from a 89-91 car), you get a 9.7:1 ratio, but then you need a different counterweight and stuff.
I wouldn't bother if I were you. If you are going to pull the engine apart just port it and leave the rotors alone. You can push a lot of power out of a ported rotary. You can also swap in a tII engine and driveline if you want serious power.
05-28-03, 10:40 PM
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ya.. i didn't think so either.....
so about how many horses on average can i expect out of porting the housing? i know it depends on the porting job, but is it a lot more than a regular engine?
thanks
so about how many horses on average can i expect out of porting the housing? i know it depends on the porting job, but is it a lot more than a regular engine?
thanks
05-28-03, 10:52 PM
#4
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porting it is like changing the cam timing, duration, and overlap, along with the port size on a piston engine.
With a street port you can make anywhere from near stock levels to well over 200 (with other mods like exhaust, etc), with a bridgeport you can make in the neighborhood of 300+, and if you are really crazy you can go with a peripheral port and make like 400 hp. As you go larger , it becomes less streetable, it gets harder to pass emissions, and the engine won't typically last as long.
With a streetport you can expect pretty much stock engine life and good drivablilty. A bridgeport typically (it can be overcome if you make the bridge thicker) does't last as long because the bridge will crack after a while. Bridgeports also don't idle very well and aren't very streetable if at all (mostly because passing emissions will be very hard, and impossible in some states simply because of the idle rpm). Peripheral ports are race engines, and really aren't an option for a street car because they don't last very long and are not very driveable.
With a street port you can make anywhere from near stock levels to well over 200 (with other mods like exhaust, etc), with a bridgeport you can make in the neighborhood of 300+, and if you are really crazy you can go with a peripheral port and make like 400 hp. As you go larger , it becomes less streetable, it gets harder to pass emissions, and the engine won't typically last as long.
With a streetport you can expect pretty much stock engine life and good drivablilty. A bridgeport typically (it can be overcome if you make the bridge thicker) does't last as long because the bridge will crack after a while. Bridgeports also don't idle very well and aren't very streetable if at all (mostly because passing emissions will be very hard, and impossible in some states simply because of the idle rpm). Peripheral ports are race engines, and really aren't an option for a street car because they don't last very long and are not very driveable.
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