high compression rotors on a NA 20b
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high compression rotors on a NA 20b
I've read a few other post and saw some hp numbers with a bridgported na 20b but nothing with high compression rotors and a bridgeport. What kind of power could be expected with that setup, and how reliable would it actually be?
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Ok honest question here...
Where would you get high compression rotors for a 20b? Or can they be machined? From what I remember the 20b rotors are actually a wider size rotor than a 13b rotor, am I right? Basically is a high compression 20b even possible?
Where would you get high compression rotors for a 20b? Or can they be machined? From what I remember the 20b rotors are actually a wider size rotor than a 13b rotor, am I right? Basically is a high compression 20b even possible?
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Hmmm, that is interesting. I have seen na 12a race engines that had lightened rotors that I believe were high compression, and bridgported making somewhere around 200rwhp. Rotorsports racing here in NC is making them and they cost about 10k an engine. Brian who owns the shop explained to me that they will last 3 seasons of hard racing....so it got me wondering if a 12a can make that much power what would a 20b do with the same stuff done to it.
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you can use the 89na rotors, they are high compression and should go right in
mike
mike
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im not 100% i havent actually done it, but all 13b rotor interchange so why not the 20b?
mike
mike
#7
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Originally posted by black99
Ok honest question here...
Where would you get high compression rotors for a 20b? Or can they be machined? From what I remember the 20b rotors are actually a wider size rotor than a 13b rotor, am I right? Basically is a high compression 20b even possible?
Ok honest question here...
Where would you get high compression rotors for a 20b? Or can they be machined? From what I remember the 20b rotors are actually a wider size rotor than a 13b rotor, am I right? Basically is a high compression 20b even possible?
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Yeah you guys are right the 13b rotors should work, sorry for the mixup, I looked at this page a while ago http://www.alamorotary.com/Rotary%20Engine%20Info.htm where they compare 20b parts to others and I thought the 20b's were bigger somehow, but again I was wrong.
Another question though are the '89s the only year with high compression n/a rotors or pretty much any year n/a 13b rotors will work?
Another question though are the '89s the only year with high compression n/a rotors or pretty much any year n/a 13b rotors will work?
#10
Originally posted by black99
Another question though are the '89s the only year with high compression n/a rotors or pretty much any year n/a 13b rotors will work?
Another question though are the '89s the only year with high compression n/a rotors or pretty much any year n/a 13b rotors will work?
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The Cosmo engines already run 9.0:1 CR.  The 1989-1991 Kouki non-turbos run 9.7:1 CR's.  You're talking very little gains (on pump gas) for so much trouble...
You ever TRIED looking for 3 Kouki NA rotors???
-Ted
You ever TRIED looking for 3 Kouki NA rotors???
-Ted
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Actually i've never heard of 3 kouki na rotors. Can you explain their characteristics? Would the gain really be that small on pump gas with slightly higher compression rotors?
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Originally posted by 94touring
Actually i've never heard of 3 kouki na rotors. Can you explain their characteristics? Would the gain really be that small on pump gas with slightly higher compression rotors?
Actually i've never heard of 3 kouki na rotors. Can you explain their characteristics? Would the gain really be that small on pump gas with slightly higher compression rotors?
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Originally posted by RETed
The Cosmo engines already run 9.0:1 CR.  The 1989-1991 Kouki non-turbos run 9.7:1 CR's.  You're talking very little gains (on pump gas) for so much trouble...
You ever TRIED looking for 3 Kouki NA rotors???
-Ted
The Cosmo engines already run 9.0:1 CR.  The 1989-1991 Kouki non-turbos run 9.7:1 CR's.  You're talking very little gains (on pump gas) for so much trouble...
You ever TRIED looking for 3 Kouki NA rotors???
-Ted
mike
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Originally posted by 87GTR
in one of my RX7 Magazines they show a NA 3rotor on the dyno 470 HP
in one of my RX7 Magazines they show a NA 3rotor on the dyno 470 HP
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Well 550hp sounds a little overkill to me, although it would be fun to have. If i'm not mistaken a na 20b would be extremely reliable, and if it can still make 400-450rwhp then thats all I really need for the street. Too bad the conversion is so expensive, I would love to drive around a 20b.
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Originally posted by 94touring
Well 550hp sounds a little overkill to me, although it would be fun to have. If i'm not mistaken a na 20b would be extremely reliable, and if it can still make 400-450rwhp then thats all I really need for the street. Too bad the conversion is so expensive, I would love to drive around a 20b.
Well 550hp sounds a little overkill to me, although it would be fun to have. If i'm not mistaken a na 20b would be extremely reliable, and if it can still make 400-450rwhp then thats all I really need for the street. Too bad the conversion is so expensive, I would love to drive around a 20b.
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What about 250hp and 250 ft lbs of torque? Don't want to be the devils advocate but I bet you wouldn't have to open the motor for that. And low end throttle response should be great.
I know the turbo cancels out noise but if its plumbed right with the right silencers and muffler it seems it would sound like any other motor.
I know the turbo cancels out noise but if its plumbed right with the right silencers and muffler it seems it would sound like any other motor.
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Yeah maybe running turbo with low boost would be the way to go, especially if you can pass full emisions. I'm sure it would still be extremely reliable too.
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Originally posted by repuguru
What about 250hp and 250 ft lbs of torque? Don't want to be the devils advocate but I bet you wouldn't have to open the motor for that. And low end throttle response should be great.
I know the turbo cancels out noise but if its plumbed right with the right silencers and muffler it seems it would sound like any other motor.
What about 250hp and 250 ft lbs of torque? Don't want to be the devils advocate but I bet you wouldn't have to open the motor for that. And low end throttle response should be great.
I know the turbo cancels out noise but if its plumbed right with the right silencers and muffler it seems it would sound like any other motor.
The turbo cancels out noise no matter how it is plumbed, although the turbine bypass air going through the wastgate isn't going to benefit from the noise reduction effect. Exhaust noise is created from the high-velocity, high-temperature exhaust violently shearing with the outside air. The turbine wheel absorbs both temperature and velocity from the exhaust stream, which reduces the exhaust noise by up to 50%. My TII didn't have any mufflers on it at all, and it was about as loud as a stock 2Gen NA.
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Originally posted by 94touring
Well 550hp sounds a little overkill to me, although it would be fun to have. If i'm not mistaken a na 20b would be extremely reliable, and if it can still make 400-450rwhp then thats all I really need for the street. Too bad the conversion is so expensive, I would love to drive around a 20b.
Well 550hp sounds a little overkill to me, although it would be fun to have. If i'm not mistaken a na 20b would be extremely reliable, and if it can still make 400-450rwhp then thats all I really need for the street. Too bad the conversion is so expensive, I would love to drive around a 20b.
-Ted