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?

[cgnj]

Hi,
You never said what type of induction you intend to use. The think the biggest you can run on djet will be 2055. I do recall seeing a post on PP that some was running 2.2 with djet. No direct experience with that issue.

Here is my experience.

I used a 78.4mm crank, with piston pins located fo 78/80 mm stroke I had about -.058 deck. So .058*25.4=1.47mm deck in mm. The math answer is 76mm stoke should give .053 mm deck (.002in).

Size of the spacer will depend on the finished chamber volume of your heads, and what CR you will run.
.04 is the typical minimum. 60cc is the typical volume of a non-flycut 2.0 head. (My finished heads are at 52cc) Using these numbers, you would run 9.2:1. If your married to a hydro cam, you probably don't want to run this high. Play with this tool.

Aircooled.net engine calc tool

I have no idea if you can clear a stock base circle cam.

Both Tom and I used scat rods. I have gleaned from STF that the CB super race rod is smaller at the big end and requires less work or no work for 78.4 stroke.
CB Super Race Rod

Learn from my mistake.
Use belt sander and clear one rod. Send them out and let the machinist finish the others and end to end balance. I did them individually and still sent them out.

Engine width
I'm building without head gaskets. Stock width=x, new width =Y, head gaskets =1.5mm, my shims are .140
Y=X-(2*1.5mm)+(2*.140 in)
Y=X+.162 in.

To me, the marginal cost and work savings of doing 76mm stroke instead of 78.4mm is nothing. If you stroke, go carbs or aftermarket FI and do 2270.

I wanted to thank Tom publicly for keeping me in the game. There was a time early this year when I was going to toss the towel in. We corresponded a little and I was able to go on. My wife is looking for him though.

Carlos

76 2270 (2 years on blocks on 8/29/03)
76 project
74 (in the van, going to the dump on Saturday)