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PDX-944 PDX-944 is offline
Autocross/Hillclimbs
 
Join Date: Oct 2012
Location: Wilsonville OR
Posts: 871
Garage
I have located a 3.0 crank, and a place to do the offset grind to 94mm.
Also I have 944enhancement that can do the wet sleeving/boring to 106mm, and supply custom pistons with gapped rings.

but I need to figure out which rods and bearings to get.

someone said mitsu, and another said small block chevy for bearings... but im struggling to figure that out.

the mitsu someone recommended was 150mm length (1.3" pin height), but that lands me .005 over deck height, with 9.3x:1 CR

if I calculate with 149mm rods (1.26" pin height) I end up at .07 deck clearance, 8.37:1 CR
That looks much better right? but how to I get 149mm rods? do I want to go with mitsu or other? I have to decide before I send the crank for grinding.

Deck height 9.05"
Bore 4.17" (106mm)
Stroke 3.7" (94mm)
Rod Length 5.87" (149mm)
Chamber Vol 56cc
Gasket Thickness .039"
Piston Dome -32cc
Pin Height 1.26" (32mm)

Equals deck clearance .07"
CR 8.37:1
Engine size 3.31L
Rod Ratio 1.59:1
Max Rod Angle 18.37 Degrees

Ideas on rods and bearings?
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Old 10-03-2017, 03:23 PM
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