914/4 Stroker cranks, Cheaper than Scat Options

[makinson1]

Does anybody besides SCAT make 75mm stroker cranks for the 1.8 motor that are Cheaper than Scat?

[Tom Perso]

Yup,

You can run a T1 rod with a 78.4mm crank with modified crank journals for T1 rods. You get a little longer rod ratio to keep the piston speeds down.

Order up a set of KN HyperEutectic 96mm pistons from Aircooled.net that have the 22mm T1 wrist pin and a stoker location (for 78mm stroke) and you are well on your way.

Get a Webcam reduced basecircle cam (extra $10) and you should not have any case or cam interference.

(IMG:http://www.qtm.net/~persoj/graphics/vw/split_case.jpg)

A view of the case with the 78.4mm crank and the Scat I-beam rods.

(IMG:http://www.qtm.net/~persoj/graphics/vw/rods.jpg)

Another shot of the case, you can see where I just "touched" the rods up for a little more clearance (to make me happier) and then they were balanced be end to end weighing. I took the extra matereal off the rod cap. They were all within .1 gram of each other. (IMG:style_emoticons/default/smile.gif)

I needed .140" cylinder shim to get a 9.5:1 C/R

Make a set of pushrod tube spacers with a lathe and a piece of 1/2" black iron pipe (it pushes the pushrod tubes out just a shade to keep 'em from leaking) and I capped it off with a set of Aircooled.net HD AL pushrods.

I've zinged the motor to 7500rpm once, but I usually keep it to 6500 or so.

Later,
Tom