Higher compression ratio for NA?
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From: Southwest Florida
From what I read the US and JDM F20C's are both 11:1 compression, however the Japaneese ECU is programmed to run more advanced ignition and therefore it yields 4-5 more hp..
Regarding 12:1 vs 12.5:1 compression, I don't have any personal experience with it as I think forced induction is the way to go for ultimate power.... However I believe that I mentioned 12:1 compression is probably the way to go.
Chris
Regarding 12:1 vs 12.5:1 compression, I don't have any personal experience with it as I think forced induction is the way to go for ultimate power.... However I believe that I mentioned 12:1 compression is probably the way to go.
Chris
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From: SLC, UT
I wouldn't run anything higher than 11.5:1 on 91 octane. On 93 octane I would go up to 12-12:3:1 CR. I think the Spoon pistons and head gasket take the CR to 12.1:1
BTW, the service manual says 11.0:1 CR. I've also heard that the JDM has 11.7:1, that's what makes the power difference.
BTW, the service manual says 11.0:1 CR. I've also heard that the JDM has 11.7:1, that's what makes the power difference.
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Higher compression is always good because it helps with fuel economy too.
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas (94 specification octane gas is the limit of consumer conventional gasoline has. Anymore than 13.5, race gas or octane additive will be required (expensive) bordering 93 oct, also consider the sound and power out of a higher comp engine, sounds signicantly nicer than any forced induction, sort of like a light NOS spray at near WOT. Doable expensiveness.
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas (94 specification octane gas is the limit of consumer conventional gasoline has. Anymore than 13.5, race gas or octane additive will be required (expensive) bordering 93 oct, also consider the sound and power out of a higher comp engine, sounds signicantly nicer than any forced induction, sort of like a light NOS spray at near WOT. Doable expensiveness.
Joined: Feb 2007
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From: Pawtucket, RI
Originally Posted by keafun,Feb 15 2011, 12:00 PM
Higher compression is always good because it helps with fuel economy too.
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas
You cannot run compression ratios that high on pump gas with an S2k.
Higher compression is good *if* you can run it without detonation or having to retard ignition timing.
I seriously doubt 13:1 is going to be a good idea for an S2k on 94 octane...
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Honestly, for NA pwr, i would go for InlinePro's stroker kit and get 12:1 pistons (you get to choose your CR and the price is included in the kit)
http://www.inlinepro.com/s1/p-237-s2000-st...em-sleeves.aspx
No point in getting too high of compression and not getting reliably. just my $.02
might be a good idea to make a post in the NA section. some of them will know better than others (including myself).
http://www.inlinepro.com/s1/p-237-s2000-st...em-sleeves.aspx
No point in getting too high of compression and not getting reliably. just my $.02
might be a good idea to make a post in the NA section. some of them will know better than others (including myself).
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From: Charleston, SC. \>
Originally Posted by keafun,Feb 15 2011, 03:00 PM
Higher compression is always good because it helps with fuel economy too.
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas (94 specification octane gas is the limit of consumer conventional gasoline has. Anymore than 13.5, race gas or octane additive will be required (expensive) bordering 93 oct, also consider the sound and power out of a higher comp engine, sounds signicantly nicer than any forced induction, sort of like a light NOS spray at near WOT. Doable expensiveness.
Consider some motorcycle engines run at 12, on high octane gas. so it is quite safe to run with 13.0 CR as long as your using 94 Octane gas (94 specification octane gas is the limit of consumer conventional gasoline has. Anymore than 13.5, race gas or octane additive will be required (expensive) bordering 93 oct, also consider the sound and power out of a higher comp engine, sounds signicantly nicer than any forced induction, sort of like a light NOS spray at near WOT. Doable expensiveness.
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