Rotaries: was Buick V6

[Bruce]

Not going to get in a flamefest here but as HP rises the amount of
deflection, *warpage* always increases.  Fact of life.
Take some iron monster like a 426 Hemi and put dial indicator on opposite
corners of the engine and go to max HP, you can read as much as 3/4"
warpage/distorsion, whatever.  If in doubt call Dick Landy, I'm sure he
remembers the testing.

As an engines HP increases, it generates more BTUs.   As you mentioned the
different materials expand at different rates, so yes they do distort more,
and a rotary isn't at all forgiving on being overheated stock or in LeMans
trim.
Bruce

From: "David Randall" <davidra at windows.microsoft.com>
Subject: Rotaries: was Buick V6
> 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

> 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?

> 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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