Rotary engine?
06-29-2009, 08:30 PM
#21
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Um, you're grossly exxagerating and have not provided any references.
Some details off of the top of my head...
GTO would be Mazda's 13B engine, which they did not have in production RX-7s in 1982 (12A only until 1983, the 13B came back in the RX-7 in 1984).
GTU is "2.5Liter and less", btw. Of note, the Mazda 12A engine qualifies, but the 13B does not -- due to the "2x" rule applied to rotary engines by nearly all racing sanctions.
A 10000rpm rotary engine won't be "cheap" by any means. A rotary engine is at best $2500 (no crate rotary engines from Mazda, sorry). If you want the bearings staked so that it'll sustain 8000+ rpms, you immediately add another $2000 to the rebuild bill. IIRC, a CSD crate LS2 will run about that same price. If you don't believe me, check out the Mazda engine rebuild prices at mazdatrix.com.
In short, if you want a REPU (Rotary Engine PickUp), just buy a REPU: http://motors.shop.ebay.com/items/?_...pu&_sacat=6001
I've owned more 1982-1985 RX-7s than I can count, I still have two today. I also have enough engine bits'n'pieces to make five functional engines (guessing), including the rare 12AT (turbo).
Some details off of the top of my head...
GTO would be Mazda's 13B engine, which they did not have in production RX-7s in 1982 (12A only until 1983, the 13B came back in the RX-7 in 1984).
GTU is "2.5Liter and less", btw. Of note, the Mazda 12A engine qualifies, but the 13B does not -- due to the "2x" rule applied to rotary engines by nearly all racing sanctions.
A 10000rpm rotary engine won't be "cheap" by any means. A rotary engine is at best $2500 (no crate rotary engines from Mazda, sorry). If you want the bearings staked so that it'll sustain 8000+ rpms, you immediately add another $2000 to the rebuild bill. IIRC, a CSD crate LS2 will run about that same price. If you don't believe me, check out the Mazda engine rebuild prices at mazdatrix.com.
In short, if you want a REPU (Rotary Engine PickUp), just buy a REPU: http://motors.shop.ebay.com/items/?_...pu&_sacat=6001
I've owned more 1982-1985 RX-7s than I can count, I still have two today. I also have enough engine bits'n'pieces to make five functional engines (guessing), including the rare 12AT (turbo).
06-29-2009, 10:36 PM
#22
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I agree.
I also think that people tend to work with what they have. I am assuming, that he has both at his disposal and is wondering how big a nut he is going to crack to make it happen.
Um, you're grossly exxagerating and have not provided any references.
Nah, I just cut and pasted what I needed and then mentioned the source. What I did not do was provide a link to the source. rx7 wiki and wankel wiki.
rx7 - look in motorsport section
http://en.wikipedia.org/wiki/RX7
wankel - look in the applications section
http://en.wikipedia.org/wiki/Wankel_engine
A 10000rpm rotary engine won't be "cheap" by any means.
I am assuming that he already has access to both the power plant and the platform, from savage deals. So, I am thinking rx7 in which case he has access to the 9k area of the tach. You are absolutely correct about staking the bearings. But I don't think that will be necessary if it stays street legal. If the project impresses, a track session should be done and if track days become a regular habit, then the bearings should be staked.
However, I think it will just be a glorified grocery getter and occasional forays into the upper limits of the tach should be ok.
Nah, I just cut and pasted what I needed and then mentioned the source. What I did not do was provide a link to the source. rx7 wiki and wankel wiki.
rx7 - look in motorsport section
http://en.wikipedia.org/wiki/RX7
wankel - look in the applications section
http://en.wikipedia.org/wiki/Wankel_engine
A 10000rpm rotary engine won't be "cheap" by any means.
I am assuming that he already has access to both the power plant and the platform, from savage deals. So, I am thinking rx7 in which case he has access to the 9k area of the tach. You are absolutely correct about staking the bearings. But I don't think that will be necessary if it stays street legal. If the project impresses, a track session should be done and if track days become a regular habit, then the bearings should be staked.
However, I think it will just be a glorified grocery getter and occasional forays into the upper limits of the tach should be ok.
But this is not my thread, it's ckblums.
This is not my area of expertise, it's yours.
This is not my what if?
My what if is a small toyota truck powered by two matched wankel engines in the bed. Powerboat style.
Or one up front and one in the back.
Or a matching set of gsxr 1100 engines in the bed.
Or a small jet turbine spining a generator that powers an electric motor attached to each wheel.
Or a small plane made out of corrugated plastic and tyvek.
Or one of those mechanical arm things from iron man, I'll take two.
And the list goes on
and on
and on
and on
and the beats...
07-13-2009, 06:01 PM
#23
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i think that those rotary engines were a great idea and i wish the car manufactures expanded on the idea some more. its cool how the can rev so high and all but i wouldn't think to put one in a yota. in my opinion the best motors for a toyota are the 20r,22r and the chevy 4.3.
07-13-2009, 06:36 PM
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id look into a 3.4 swap, like you said. economy anywhere from 10mpg to like 24mpg. maybe a little more. i dont have one, so i cant say for sure. a buddys taco, lifted (bro), 4" blocks, 35s, he gets on it all the time (lead foot) gets around 9-10mpg. i dont know everyones situation, so i generalized lol.
Something must not be right.
I have a 3.4L in my 4runner (heaver) lifted, running 35s and drive it like its stolen, and im getting 17-19mpg...
Just wondering whats going on.
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