Scat Stroker Rotating Assembly Kits

[jeepxj3]

Has anyone used these kits?
They come with crank, forged rods, forged pistons, bearings and balanced.
Flatlander Racing has them for $895. Is there any other source?
Anything to watch out for?

[hurleygo3]

I have a SCAT crank and forged rods sitting in the garage waiting to be built. The kit your looking at for $895 doesn't come with the rods. The only issue I saw with the complete stroker kit from SCAT is the deck height with the KB944 pistons. That's what pistons they are using. It puts it at .025

[YJ Genie]

Hurleygo3,
Where do you come up with the .025 deck height? Is that piston protrusion or recess? Is that on a particular block? Many Years of engine work and research has shown that @ 5000 rpm you are likely to see .030" rod stretch.
With +.025" piston protrusion and .030" rod stretch(.055" @ 5000 Rpm) combined with .045" head gasket will result in .010" interference with cylinder head.... I have to believe Keith Black and Silvolite have a better handle on their products than that.
Now if its -.025" recess, that may be a problem. Is that calculated or measured?
I hope you are wrong, cause I just ordered the stage 3 kit. with Scat rods and crank and IC944 pistons

Can the deck on a 1998 '569 block be cut that much safely? .. Sure hope so!

[jsawduste]

25 in the hole with 4.0 length rod.

The chambers on these engines like (demand) a tight quench/squish. Common is to have pistons with a revised pin height to give a zero deck. Combined with a compressed .043 gasket they work fairly well.

[Cheromaniac]

Many Years of engine work and research has shown that @ 5000 rpm you are likely to see .030" rod stretch.

Depends on the material that the rods are made from.

With +.025" piston protrusion and .030" rod stretch(.055" @ 5000 Rpm) combined with .045" head gasket will result in .010" interference with cylinder head.... I have to believe Keith Black and Silvolite have a better handle on their products than that.
Now if its -.025" recess, that may be a problem. Is that calculated or measured?

Give or take a few thou depending on production tolerances, the IC944 pistons end up 0.027" down the hole at TDC in a 4.0L block with a 258 crank & 4.0L rods. Add a compressed head gasket thickness of 0.043" and you end up with a quench height of 0.070". Even if you reduce the quench height to 0.040", you'd still have 0.010" to spare between the piston crown and head at 5000rpm.
Keith Black quote a 4.0L block deck height of 9.433" on their site for the IC944/945 pistons but since the actual block deck height is 9.453", I guess K-B expect you to have 0.020" milled from the block when using these pistons thus leaving them only 0.007" down the hole (with a quench height of 0.050").

[jeepxj3]

A better 'kit' is use the Scat crank and rods and add the Bulltear pistons.

[YJ Genie]

Bulltear piston?... I'll look into it. Thanks for direction...

[YJ Genie]

I would like to thank each of you for your input. I learn something new every day.
Gene S.

[jeepxj3]

Bulltear-
http://www.bulltear.com/catalog/product ... cts_id=242