Rotaries: was Buick V6

[David Randall]

Hmm, above 300 HP, a 13B two rotor rotary engine won't "warp".  The term
"housing" can be applied to the side housings / end plates, or the rotor
housings (fat figure 8 part).

Warpage usually occurs when the engine is overheated.  The materials
used in the side housings are different than those used in the rotor
housing.  As temperatures rise, the expansion of these different
materials occurs at a different rate.  That differential usually causes
some type of warpage, or will allow enough of a gap inbetween the two
housings to let the coolant seal become compromised (exposed to
combustion).  

High HP won't necessarily overheat the engine, but a poorly designed
system will cause overheating.

Another possible "warpage" story would be the warpage of a 3 or 4 rotor
eccentric shaft (think crankshaft).  In that case, high horsepower would
cause too much stress on a poorly designed shaft.  Some early 3 or 4
rotor shafts were built up from 2 rotor shafts and welded together.
Given the fact that a 3 rotor engine with full engine management and
turbos can produce up to 800-900 HP, you could see why a welded together
eccentric shaft could become warped.

But, run of the mill 13B and 12A rotaries don't usually warp from HP,
they warp from overheating.

HTH

Dave Randall


-----Original Message-----
From: Jim Blackwood [mailto:jblackwood5 at home.com] 
Sent: Monday, October 29, 2001 11:30 AM
To: diy_efi at diy-efi.org
Subject: RE: was injector staging: now Buick V6


I heard the housings begin to warp around 300 and higher. Anything to
that?

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Bruce
Sent: Saturday, October 30, 1999 11:16 AM
To: diy_efi at diy-efi.org
Subject: Re: was injector staging: now Buick V6



Look up a 4 rotor, and be sure to sit down first.

I can run at about 500 in my street trim GN.  Lots of guys doing about
the same thing, with less work then I have in mine.  $2K takes care of
injectors, a Turbo, better electronics, and money left for tires, etc.,
on a GN. Bruce

From: <bill.shurvinton at nokia.com>
Subject: RE: was injector staging: now Buick V6
> 12A turbo 360Ibs!!! wierd. AFAIK the 12As were around the 200 mark, at

> least in NA form. I will do some research at home tonight. I can 
> believe that the 20B is over 300, but that is a different beast. As 
> for life, splash out on ceramic seals and the engine lasts for ages. I

> have heared of 3 seasons racing on a 500BHP motor with no rebuilds. 
> Mind you at $2k for a set of seals, they ought to be good. Bill

> From: ext Bruce [mailto:nacelp at bright.net]
> Subject: Re: was injector staging: now Buick V6
> Rotary 12A with turbo, 360 lbs.
> B


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