V8 - Rx7

[RotaryWeapon]

Pic of installed turbo.

[nx468]

Originally Posted by onikageka

RotaryWeapon: The information I'm offering to you is from posting on the following forums. Like I said, it's been hammered to death in these forums.

http://www.torquecentral.com/forumdisplay.php?f=11
and
http://www.rx7club.com/forumdisplay.php?f=118

As far as R&D, you're a but off. The rotary engine was originally developed and tested in 1926. That's plenty of time for "R&D" to give it the same love and attention that piston engines have had. A little known fact is that the patent for the rotary engine has been purhcased and researched by every major car manufactuer. Mazda was the only company that felt they could make it work.

As far as building a 3 rotor RX7 for free, that's pretty far off. At least here in the US. Only a handful of companies can do it and even then it's very costly. Estimated at $30k a swap. You don't like the LS1, that's fine. But you cannot deny the simple fact that it's an amazing engine.

Oh, and on the drag racing note.... do I even have to mention how fast 427ci V8s run?

newp
here ya go 1500hp Ls1 Ta Fastest GEN III LS1 to date in a Street Car

[onikageka]

1500hp, nice!

[RotaryWeapon]

Well what I meant is I have spare motors that I can throw together and put in my car myself. And theres a difference between purchase and research and R&D.

[Gir89]

that is sooooooooo cool

but i would still want a 3 rotor

[RexRyder]

Originally Posted by 68 Vette

Oh, i wasnt sure if you were talking about boost so i just threw that in there but you have to admit, the reliability of them goes down so much after they have turbos put on them. But i still love rotaries, the powerband is nice and smoot, but one thing i hate is the fact that there is no torque, but even the best things in life have some fualts...

you do kno that torque is also dependent on the turbo as well right. a frend of mine has a 13b-re cosmo. 310rwhp. 405ft/lbs of torque.

[onikageka]

I don't really want to start another arguement but I think your 310hp and 405ft.lbs. are wrong. Either it's a typo or just a flat lie.

Here's why:

HP = (Torque * RPM) / 5252. - Basic formula to calculate horsepower.
310 = ( 405 * X) / 5252 - Formula with the numbers
310 = 405x / 5252
310 = 0.7711x
23 = x

So based on the numbers you've provided, the engine make 310hp @ 23rpms. It's actually not very possible for a rotarty engine to make more torque than horsepower because a rotary makes it's power through higher engine speeds. Like a sportsbike. The higher you take the engine's RPMs, the more it's multiplied agaist the torque and the more horsepower it makes.

About the only way I can come up with a rotary having more torque than HP is if someone made it into a diesel. Not calling you a liar or anything, but I'd like to see a pic of the dyno sheet if you have it.

[Verrückt]

Originally Posted by onikageka

I don't really want to start another arguement but I think your 310hp and 405ft.lbs. are wrong. Either it's a typo or just a flat lie.

Here's why:

HP = (Torque * RPM) / 5252. - Basic formula to calculate horsepower.
310 = ( 405 * X) / 5252 - Formula with the numbers
310 = 405x / 5252
310 = 0.7711x
23 = x

So based on the numbers you've provided, the engine make 310hp @ 23rpms. It's actually not very possible for a rotarty engine to make more torque than horsepower because a rotary makes it's power through higher engine speeds. Like a sportsbike. The higher you take the engine's RPMs, the more it's multiplied agaist the torque and the more horsepower it makes.

About the only way I can come up with a rotary having more torque than HP is if someone made it into a diesel. Not calling you a liar or anything, but I'd like to see a pic of the dyno sheet if you have it.

You suck at the car math.

Engines almost never produce peak torque and peak horsepower at the same RPM.

[Verrückt]

V-8 RX-7's kick ass and I wouldn't mind having one myself.

[RexRyder]

Originally Posted by onikageka

I don't really want to start another arguement but I think your 310hp and 405ft.lbs. are wrong. Either it's a typo or just a flat lie. .

its neither typo or lie.

Originally Posted by Verrückt

You suck at the car math.

Engines almost never produce peak torque and peak horsepower at the same RPM.

i agree

[onikageka]

Then let's see the dyno sheet. As for my math, I was guessing at a peak torque or near 5252. Even so, it shows how far off your numbers have to be.

[Verrückt]

Originally Posted by onikageka

Then let's see the dyno sheet. As for my math, I was guessing at a peak torque or near 5252. Even so, it shows how far off your numbers have to be.

Your math doesn't work period. You have one equation and two unknowns. I have seen many 2.7 liter engines with approximately the same dyno numbers.

[onikageka]

True there are two unknowns, but I am using common sense about rotary engines.

The simple fact of the matter is that the only way for that engine to make more torque than horsepower is if it never went higher that 5252rpm. HP is an expression of torque as it raises in RPM. 5252rpms is where the HP and Torque lines should cross (SAE corrections move this mark but never by very much). Even if the motor had 405ft.lbs. of torque, it would have more HP than that as soon as the engine goes above 5252rpm. What rotary engine redlines at 5200rpms?

[onikageka]

RexRyder: Help me out here. Post the dyno sheet. Or at the very least post the RPM's for the peak power ratings on this mythical rotary.

[Toyotadude]

This is so far my favorite LSI RX-7>>>> http://www.hinsonsupercars.com/