Custom Sleeves 88mm-90mm (opinions)

[P@]

"Juan Cardenas" you wrote:

> cool, so darton is actually gonna make these? that
> sounds like a deal to me,

Their making them, because Im paying them too  :-)  Im sure if there is
enough interest, or if they see some demand, they could stock such a sleeve,
considering thats all they do, and they have no sleeves for the Nissan
platform, this would be a great project for them to jump into our market.

>I can get custom pistons
> made pretty easily, would be cool to have the sleeves
> ready to buy, but that .pdf might come in handy.

Once all the details about the design reach a few more people, Ill refine
the drawing and leave it for people to use.  Question, isnt there a 90mm
piston for the 300ZX that fits out there already?  Im sure thats in the
archives but I didnt look all that hard.

> What's gonna be the bore size out of the package 88mm
> or 90mm? stock bore is 86mm correct?

Stock bore is 86 mm.  The bore size out of the box will be 3.400" +/- 0.002"
or about 86.36mm.  Once installed, youll have to resurface the top and
bore/hone the sleeve to the correct size according to the piston choice.
This is why Im going with this particular dimension on the rough finish
bore.   The plan is to have a sleeve that will fit 88mm - 90mm
pistons....kinda like a universal fit situation, but for the SR20.  Youll
need a torque plate to bore and hone these properly.  This design would also
accomodate an 87mm piston, but its been proven that you dont need sleeves
for a 1mm overbore.

> BTW - even if this material is stronger than the stock
> cyl sleeves, how would the thinnness of it affect it's
> endurance in high performance applications? would be
> cool if we could get a nice tech viewpoint on this.

Yes it would.....George, Mike, Rob....anyone???  From Darton, they wont do a
sleeve with less than 0.093" wall thickness.  Im sure they have their
reasons.

P@
www.customsteel.com
99 G20 with some mods....