What V8 would you stick in your rx7?

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Old Mar 5, 2009 | 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!!
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Old Mar 5, 2009 | 11:32 AM
  #152  
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to be honest and ill get flamed, but i always wanted to see a 302 5.0L motor in a fd..
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Old Mar 5, 2009 | 09:40 PM
  #153  
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how much does a sr20 weigh?????
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Old Mar 6, 2009 | 02:18 AM
  #154  
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the motor itself is around 300 pounds.. then you add turbo stuff.. its comparable to a ls1 or a 13b-rew give or take 20-30 pounds..
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Old Mar 7, 2009 | 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...

Last edited by *Nemisis*; Mar 7, 2009 at 01:59 AM.
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Old Mar 8, 2009 | 06:40 AM
  #156  
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Originally Posted by heidihi
to be honest and ill get flamed, but i always wanted to see a 302 5.0L motor in a fd..
Funny you should mention that..........check my name. New build in process...
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Old Mar 8, 2009 | 11:01 AM
  #157  
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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.

Originally Posted by *Nemisis*
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...
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Old Mar 8, 2009 | 11:05 AM
  #158  
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Anybody around here have 30k for just the engine?

You could have a fully built FD for less.

Cool idea though just not practical at all.
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Old Mar 8, 2009 | 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.
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Old Mar 8, 2009 | 10:57 PM
  #160  
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From: ames, iowa
Originally Posted by 302_fd
Funny you should mention that..........check my name. New build in process...
i like it! If i didnt already have my ls1 and the full hinson kit.. id be looking for a donor 5.0L engine, and stick it behind a t56 that summit sells for the 5.0L motors.. that would be fun i think! good luck on ur swap n keep us or well me posted
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Old Mar 9, 2009 | 07:00 PM
  #161  
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That Hyabusa V8 is awesome, but a little too small displacement for N/A in a car this size. You see them in Radicals. Might be awesome in an Elise... 200 lb. motor!
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Old Mar 9, 2009 | 07:43 PM
  #162  
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the busa v8 is begging for boost.. people are making over 500 on the 1.3's so i would think the 2.8 could make all the power you want. and with its itty dimensions, theres plenty of room for plumbing!
too bad about the price tho.
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Old Mar 10, 2009 | 01:22 PM
  #163  
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Originally Posted by Josh18_2k
the busa v8 is begging for boost.. people are making over 500 on the 1.3's so i would think the 2.8 could make all the power you want. and with its itty dimensions, theres plenty of room for plumbing!
too bad about the price tho.

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.
Attached Thumbnails What V8 would you stick in your rx7?-f40-5.jpg   What V8 would you stick in your rx7?-f40-2.jpg   What V8 would you stick in your rx7?-f40-1.jpg   What V8 would you stick in your rx7?-f40-4.jpg  
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Old Mar 11, 2009 | 12:37 AM
  #164  
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Originally Posted by ptrhahn
That Hyabusa V8 is awesome, but a little too small displacement for N/A in a car this size. You see them in Radicals. Might be awesome in an Elise... 200 lb. motor!
Errr... Your car currently has a 1.3L motor that makes less than the H1 and weighs more...

If I had cash just to go spending ***** nilly I would put one dem der in a smart car ----->SUICIDE
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Old Mar 11, 2009 | 01:58 AM
  #165  
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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.
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Old Mar 11, 2009 | 11:50 AM
  #166  
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Originally Posted by *Nemisis*
Errr... Your car currently has a 1.3L motor that makes less than the H1 and weighs more...

If I had cash just to go spending ***** nilly I would put one dem der in a smart car ----->SUICIDE
Look at the torque curve of the Busa V8. Peter's car would be faster up till the busa v8 starts making max power around 9-10k rpm. Peter's car would FEEL a LOT faster than the same car with that Busa V8, because of how the engine delivers torque. Getting a rotary to rev to 8000rpm and make 400whp with 300tq is not all that difficult or cost prohibitive anymore. Why would you spend $30k on an engine to give you less? Just for the revvs?


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.
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Old Mar 11, 2009 | 07:56 PM
  #167  
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Ls1 is a great way to go. Light tons of power revs to 7K and cheap.
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Old Mar 12, 2009 | 01:53 AM
  #168  
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ive actually been thinkin of kickin it old school.. and dropping an old 350 small block in a fc shell
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Old Mar 12, 2009 | 06:29 AM
  #169  
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whats a Turbo V?
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anyone consider Volvos V8? lol me and my volvos.
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Old Mar 13, 2009 | 11:45 AM
  #170  
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Originally Posted by cozmo kraemer
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.

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.
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Old Mar 22, 2009 | 06:17 AM
  #171  
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Would have to be anything LSx.. due to cost tho I just stuffed an LT1 in mine. It's a freakin' hoot.
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