Re: 13B>>>>Quattro

[Joshua Hadler <josh.hadler@everest.com>]

Graydon D. Stuckey wrote:
> 
> > If you plunk down the big bucks for the twin turbo set up. Yes, 250 or
> > so is feasible from a normally aspirated 13B but it will _not_ be a very
> > nice engine to drive on the street. No bottom end power at that point.
> 
> I'd take exception to that.   A properly built 13B, for this application,
> would be a fine driving motor BTDT.   I wouldn't do it without the turbos
> though.

The turbos would be essential. But a 13B at 200+hp would be an expensive
engine with porting and tuning. And I've had experience with such
crutters and they are not much fun if they're in a street driven car.
They are loud and difficult.

> > Yes, the 13B has a fantastic linear power band with
> > no real redline. Yes, it can put out gobs of power for such a tiny
> > engine. But I don't think that a 13B has the neccessary low end grunt to
> > get a big 'ol Audi quattro moving.
> 
> No real redline?   Hmmm, I think if you rev that little beer keg to 8500+
> too many times, you'll find one of the rotary's few weaknesses - the
> eccentric shaft bearings tend to wander a little.   8 grand is easy
> though :-)

A friend of mine races an RX7 that has a -stock- 13B motor that puts out
170+ rear wheel horse power. The induction and exhaust are _anything_
but stock, but it is normally aspirated and the motor itself is totally
stock. It is a bear to get off the line, the exhaust note is loud and
raspy, but when it's at full song at over 10K RPM, it hauls! He has a
red paint mark on his tach at 10.5 that he won't exceed, but the real
redline for a rotary powered car is not the engine but the transmission.

> The trouble is that it is expensive.   A properly built N/A 13B will cost
> you in excess of 4000 dollars.  A turbo will be even more.   Then to make
> it work at elevated hp levels will require a decent aftrermarket EFI
> system which adds a couple grand.  Then you need to dyno the thing to
> make it work right, which can quickly eat up another grand.   At that
> point you might as well get a 20V engine.

That's how I feel. Audi already makes a killer motor that has lots of
power out of the box (or donor car in this case), why not go with what
works.
 
> The best part would be the four little triangular rings in the grill!  :-)

No pistons good huh? Hey as long as we're dreaming, why not get ahold of
one of those three rotor setups that mazda made (sill makes?) for
racing. Now _that_ would be a kick!
 
-Josh2

-- 
Joshua Hadler          '74 914 2.0 CSP/Bi - Hooligan Racing #29
                       '87 Quantum Syncro - aka stealth quattro

jhadler@everest.com
http://rainbow.rmi.net/~jhadler/jahome.html