RE: Crazy Idea No.2

["Douglas Hurst Quebbeman" <dougq@iglou.com>]

> > > Tony Lum wrote:
> > 
> > > Hey gang,
> > >
> > > Has anyone tried increasing the compression of the turbo engines by
> > using
> > > pistons from NA engines during a rebuild?  Then you could get some low
> > end
> > > grunt and even back off on the boost.  It probably wouldn't pass CA smog
> > > anymore, and you would certainly have to remap the fuel curve...just a
> > thought
> > >
> > > -Tony
> > 
> 	Harrison wrote:
> 
> > I think that the title to this e-mail says it all: CRAZY. Wouldn't this be
> > like sticking a turbo on a NA engine and blowing pistons or connecting rods?
> > 
> > harrison
> 
> Other things to keep in mind.  The piston skirts on turbo motor pistons have
> been clearanced for the oil squirters.  If you were to put NA pistons in a
> turbo block, you'll damage either the pistons, or the oil squirters...  You
> may also have a problem with valve meeting the piston tops, due to different
> shapes and different lift and duration between the NA and turbo cams...
> 
> Food to dissuade crazy ideas from becoming crazy actions.
> -Stott

There is (or used to be) a safer way to raise compression slightly.

I used to get catalogs from a company in Birmingham, Alabama, named
PAECO. They rebuild engines to a number of different levels of 
capability. Complete blueprinting & balancing, Nitriding crankshafts, and
allsorts.

One service they performed for pistons was to coat the tops with a
substance that is initially soft and almost sticky, but which over
time, hardens into a ceramic whose primary purpose is to shield
the piston from heat. Benefits are less heat soak and some protection
from lean fuel conditions. But it also boosted the compression a
little bit.

I bought some stuff from them years ago, like a Weber rebuild kit,
and a Wieand air filter. I always intended them to do the rebuild
on the Porsche 924 engine I wanted to buy and drop into a 100LS.

Anybody else ever heard of them, know if they still exist?
--
-Douglas Hurst Quebbeman (dougq@iglou.com)            [Call me "Doug"]
    QuattroClub USA# 4536              Audi International # 100024
       74 100LS Auto, 77 100LS Auto, 84 Coupe GT, 86 5Kcstq   
"The large print giveth, and the small print taketh away."  -Tom Waits