What V8 would you stick in your rx7?
03-05-09, 11:31 AM
#151
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a custom titanium motor based on a hemi stroked out to like 9.4L or something like that with a rev limit of around 15k and produces around 900hp natural and equal torque numbers that is also super streetable and gets around 150mpg.. thats the v8 id go with... ohh wait that was in my dream.. but still haha!!
03-07-09, 01:55 AM
#155
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Don't know if anyone else has brought this up yet (Didn't read the whole thread) but if I were going to stick a V8 into an FD, it would be this one 
http://www.h1v8.com/page/page/1562068.htm
For those of you who have never seen this, its two 1400cc (Stroked) Hayabusa Motorcycle engines sandwiched together with a custom crankcase ect...
Naturally aspirated specs are:
* 75 degree odd fire V8
* 2.8 LITER, 170 cu. in. displacement
* 84mm Bore X 63mm Stroke
* 4 cams, 32 valves via internal silent chain
* 530mm wide x 485mm long x 530mm high
* 400HP @ 10,000 rpm with stock street cams
* 245 ft-lbs torque @ 7500 rpm
* 200 lbs engine weight
* Billet nitrided steel 180 degree crank
* 4340 H-beam con-rods with ARP bolts
* Billet 6061-T6 aluminum crankcase
* Dry sump oil system with 4 stage pump
* 7.25" or 5.5" Twin disc clutch
* DTA S80 full sequential ECU
* Unique cylinder offset and cam drive arrangement yields a compact design- Patented
So about the same size, lighter and makes more power than a 13B turbo, slap some twins on that and pick up a nice 600+
No need to worry about the rpm's the engine was originally designed to rev allot higher than that.
Oh, and with a price of $30,000 you can run down and pick one right up! Forgot to mention that part...
http://www.h1v8.com/page/page/1562068.htm
For those of you who have never seen this, its two 1400cc (Stroked) Hayabusa Motorcycle engines sandwiched together with a custom crankcase ect...
Naturally aspirated specs are:
* 75 degree odd fire V8
* 2.8 LITER, 170 cu. in. displacement
* 84mm Bore X 63mm Stroke
* 4 cams, 32 valves via internal silent chain
* 530mm wide x 485mm long x 530mm high
* 400HP @ 10,000 rpm with stock street cams
* 245 ft-lbs torque @ 7500 rpm
* 200 lbs engine weight
* Billet nitrided steel 180 degree crank
* 4340 H-beam con-rods with ARP bolts
* Billet 6061-T6 aluminum crankcase
* Dry sump oil system with 4 stage pump
* 7.25" or 5.5" Twin disc clutch
* DTA S80 full sequential ECU
* Unique cylinder offset and cam drive arrangement yields a compact design- Patented
So about the same size, lighter and makes more power than a 13B turbo, slap some twins on that and pick up a nice 600+
No need to worry about the rpm's the engine was originally designed to rev allot higher than that.
Oh, and with a price of $30,000 you can run down and pick one right up! Forgot to mention that part...
Last edited by *Nemisis*; 03-07-09 at 01:59 AM.
03-08-09, 06:40 AM
#156
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03-08-09, 11:01 AM
#157
I know it's not good to quote pics but I think this engine deserves to continue to be seen. That is unfricken believable. It looks like a F1 Engine almost.
Don't know if anyone else has brought this up yet (Didn't read the whole thread) but if I were going to stick a V8 into an FD, it would be this one
http://www.h1v8.com/page/page/1562068.htm
For those of you who have never seen this, its two 1400cc (Stroked) Hayabusa Motorcycle engines sandwiched together with a custom crankcase ect...
Naturally aspirated specs are:
* 75 degree odd fire V8
* 2.8 LITER, 170 cu. in. displacement
* 84mm Bore X 63mm Stroke
* 4 cams, 32 valves via internal silent chain
* 530mm wide x 485mm long x 530mm high
* 400HP @ 10,000 rpm with stock street cams
* 245 ft-lbs torque @ 7500 rpm
* 200 lbs engine weight
* Billet nitrided steel 180 degree crank
* 4340 H-beam con-rods with ARP bolts
* Billet 6061-T6 aluminum crankcase
* Dry sump oil system with 4 stage pump
* 7.25" or 5.5" Twin disc clutch
* DTA S80 full sequential ECU
* Unique cylinder offset and cam drive arrangement yields a compact design- Patented
So about the same size, lighter and makes more power than a 13B turbo, slap some twins on that and pick up a nice 600+
No need to worry about the rpm's the engine was originally designed to rev allot higher than that.
Oh, and with a price of $30,000 you can run down and pick one right up! Forgot to mention that part...
http://www.h1v8.com/page/page/1562068.htm
For those of you who have never seen this, its two 1400cc (Stroked) Hayabusa Motorcycle engines sandwiched together with a custom crankcase ect...
Naturally aspirated specs are:
* 75 degree odd fire V8
* 2.8 LITER, 170 cu. in. displacement
* 84mm Bore X 63mm Stroke
* 4 cams, 32 valves via internal silent chain
* 530mm wide x 485mm long x 530mm high
* 400HP @ 10,000 rpm with stock street cams
* 245 ft-lbs torque @ 7500 rpm
* 200 lbs engine weight
* Billet nitrided steel 180 degree crank
* 4340 H-beam con-rods with ARP bolts
* Billet 6061-T6 aluminum crankcase
* Dry sump oil system with 4 stage pump
* 7.25" or 5.5" Twin disc clutch
* DTA S80 full sequential ECU
* Unique cylinder offset and cam drive arrangement yields a compact design- Patented
So about the same size, lighter and makes more power than a 13B turbo, slap some twins on that and pick up a nice 600+
No need to worry about the rpm's the engine was originally designed to rev allot higher than that.
Oh, and with a price of $30,000 you can run down and pick one right up! Forgot to mention that part...
03-08-09, 08:35 PM
#159
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If I was spending that kind of money I would have one of the Katech engines I quoted before... the 8000rpm 346cu in. LS7 produces a lot more power than that haybusa v8. If you look at the torque curve of that H1...why would you move away from the rotary? It is a great engine, and it is pretty sweet and a really interesting engineering experiment, but it seems sort of halfway between the rotary and a standard larger displacement v8.
Part of the draw for most of the V8 swappers is the fact that it is a little less high strung and a lot more reliable. Moving to a high strung v8 requiring as much or more attention as the rotary seems rather pointless to me. I would just stick with the triangles.
That is my opinion though...
Someone above listed an old F1 cosworth engine for $7k... that could be interesting... but I still hold to what I said above.
Part of the draw for most of the V8 swappers is the fact that it is a little less high strung and a lot more reliable. Moving to a high strung v8 requiring as much or more attention as the rotary seems rather pointless to me. I would just stick with the triangles.
That is my opinion though...
Someone above listed an old F1 cosworth engine for $7k... that could be interesting... but I still hold to what I said above.
03-08-09, 10:57 PM
#160
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03-10-09, 01:22 PM
#163
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Would be an interesting project. A little out of my price range though.
Motec controlled boosted busa V8 in an FD or Exige could be a lot of fun. Any other street car chassis out there that could house the thing?
A boosted busa v8 is kind of like the Ferrari F40 engine...or at least in the same vein.
03-11-09, 12:37 AM
#164
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If I had cash just to go spending ***** nilly I would put one dem der in a smart car ----->SUICIDE
03-11-09, 01:58 AM
#165
LS7 if I had the $. I'd settle for a C6 LS2 either do a crazy NA build or just wack a pair of snails on it.
Honestly in terms of ease of modification, lightness, compactness, it's easily the best choice. And I'm not even a muscle car fan nor do I live in the states.
Honestly in terms of ease of modification, lightness, compactness, it's easily the best choice. And I'm not even a muscle car fan nor do I live in the states.
03-11-09, 11:50 AM
#166
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I have a friend that has a Ferrari F430. He took me for a ride and I took him for a ride in my car down the same road. We both said the same thing...the V8 FD 'feels' faster because of the torque. It was actually pretty interesting the way the F430 felt, really started to take off around 7000rpm. That car's most impressive feature (aside from the sounds it makes) is its brakes! HOLY mother!
Some people don't like the 'immediate' torque feel of the larger displacement V8, and I can see that point of view, but one thing that does is make the car a little easier to drive fast because the torque curve is so broad.
03-13-09, 11:45 AM
#170
I think the LS series does just fine. From a driver's point of view my car is TOTALLY in the spirit of the RX7 there is no denying that. I have had discussions with Peter through these threads over and over and I can promise you that the car is every bit as inspiring as it was with the rotary. It is MORE responsive and there is no upset to the handling or balance. Peter, have you driven a well put together LS1 FD?
Maybe because the engine came from a "camaro" it isn't up to standard... but it comes pretty close to meeting your requirements. It is relatively high revving (up to 7000 rpm in certain street applications, complete race engines can go to 8000, my 100% stock engine revs to 6300 which is plenty with the way it is geared and the torque curve), it is high compression, it is all aluminum...etc. I can attest to it being more responsive to throttle than the rotary, and the torque makes the car feel even more like a go kart, just instant power. I think if anything the V8 amplifies the RX7's strength, which is that of responsiveness.
Sometimes I think you give the FD a little too much 'exotic' credit. Like it should have a flat plane Ferrari V8 or something... Just because the engine most used is common, doesn't mean it is not capable.
Maybe because the engine came from a "camaro" it isn't up to standard... but it comes pretty close to meeting your requirements. It is relatively high revving (up to 7000 rpm in certain street applications, complete race engines can go to 8000, my 100% stock engine revs to 6300 which is plenty with the way it is geared and the torque curve), it is high compression, it is all aluminum...etc. I can attest to it being more responsive to throttle than the rotary, and the torque makes the car feel even more like a go kart, just instant power. I think if anything the V8 amplifies the RX7's strength, which is that of responsiveness.
Sometimes I think you give the FD a little too much 'exotic' credit. Like it should have a flat plane Ferrari V8 or something... Just because the engine most used is common, doesn't mean it is not capable.
Agreed. If anyone wants more rpm just put a solid roller cam and a ported intake in it and the power band can extend to 7500+ ... without sacrificing the broad torque curve. The LS motors are an awesome powerplant from stock to wildly stroked and modified.
It's a freakin' hoot.
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