Mazda RX-7 rotary engined bike

This thread is for discussion of the article Mazda RX-7 rotary engined bike

Posted: 17/05/2007 at 14:44

That's certainly different

Posted: 17/05/2007 at 14:52

nice furry seat

Posted: 17/05/2007 at 14:57

They are using a non-turbo motor with a standard intake configuration. Stock numbers on the non-turbo 13B were between 135 hp and 160 hp.
They will not 'easily' get 300hp without a peripheral port intake on a full race engine.

180 hp is about the max that would have.

The rotary is loud. I mean really really loud. Those open pipes will be interesting.

Power to weight, that bike would have trouble keeping up with a R1 in the stop light gp.

'Two power strokes for every dead stroke', That is not true at all. It is still a 4 stroke engine. It just goes round and round, not up ad down.:burnout:

The bottom mount radiator is pretty cool though.

Posted: 17/05/2007 at 15:54

True even the older 12A came with around the 105hp mark from memory

Posted: 17/05/2007 at 16:20

Hope the brakes don't suffer from fade!!

Posted: 17/05/2007 at 20:56

KneeDragonR1 wrote

'Two power strokes for every dead stroke', That is not true at all. It is still a 4 stroke engine. It just goes round and round, not up ad down.:burnout:

eh?? you're wrong there for a start.

The Wankel rotary effectively has 3 "fires" per rotation of the crankshaft - a 4 stroke has one every 2 rotations of the crankshaft.

Posted: 17/05/2007 at 21:26

RiceBurner wrote

eh?? you're wrong there for a start.

The Wankel rotary effectively has 3 "fires" per rotation of the crankshaft - a 4 stroke has one every 2 rotations of the crankshaft.

Wankel is a 4 stroke, dur.

What you meat to say was:
"The Wankel rotary effectively has 3 "fires" per rotation of the crankshaft - a [strike]4 stroke [/strike] reciprocating engine has one every 2 rotations of the crankshaft."

You are still wrong though.
The engine fires three times for every revolution of the rotor.
It is an eccentric shaft not a crank shaft.
The eccentric shaft rotates 3 times for every revolution of the rotor.
Times two rotors.


HTH

Posted: 18/05/2007 at 14:55

KneeDragonR1 wrote

Wankel is a 4 stroke, dur.

it doesn't 'stroke' at all...it 'cycles'

as for the original article, the power figures are balls, as pointed out by others. Had it been a 20b (three rotors) then it could get 300 without turbos...but not a 13b.



I've got an RX-7

Posted: 20/05/2007 at 17:51

Papercup wrote

it doesn't 'stroke' at all...it 'cycles'

as for the original article, the power figures are balls, as pointed out by others. Had it been a 20b (three rotors) then it could get 300 without turbos...but not a 13b.



I've got an RX-7

It still follows the 4 strokes of the otto cycle.

I've owned, raced, rebuilt, several RX-7s

Posted: 22/05/2007 at 12:34

Looks like it'll make your ears bleed if you stand close enough to it without industrial strength ear mufflers.

My old rx7 13b had a street port, with a straight through 3" exhaust. You could hear it over the top of WRC cars it was so loud. That thing looks like it has maybe a couple of inches of exhaust piping!

Posted: 22/05/2007 at 13:11