Long block vs short block crankshaft question
 

Is there any difference in the crankshaft for 3.0 crankshaft? Also, other than"longer or shorter" what's the diff. between long and short blocks, and are their cranks interchangeable? TIA

The cranks are the same. In my experience, a "short block" is a term used to describe an engine block with crank, con rods, and pistons assembled. A "long block" can mean anything from a short block plus valvetrain to a complete, running engine with ecu and everything. Others may have different experiences.

a difference between a 3.0 crankshaft and what else? the 3.0's are the same from 968's and s2's. but yes they are different than 2.5 cranks.

http://gallery.rennlist.com/albums/a...lock.sized.jpg
short block

http://gallery.rennlist.com/albums/a...lock.sized.jpg
long block

http://gallery.rennlist.com/albums/a.../complete1.jpg
almost complete motor.

2.5 crank has a 78.9 stroke, 3.0 crank has 87.8 stroke, the next photo will show WHY you have to use custom rods with 3.0L cranks or you have to cut on the rod bolts, machine girdle, etc if you use stock rods; the clearance.
http://gallery.rennlist.com/albums/albur13/3Lcrank.jpg

Ski, it looks great!

Ski,
Nice shots. I'm curious though, what are the heat discolorations on the crank adjacent to the rod caps? I don't think I've ever seen that before.

Steve

"2.5 crank has a 78.9 stroke, 3.0 crank has 87.8 stroke..."

The 3.0 liter crank is 88mm, no?

Don't know why you've never seen them before, it's the normal heat treat for all of the cranks in our cars, 3.0l and 2.5l.

Dal.

Tom, I thought it was 87.8 exactly...I just thought everyone used 88. Thanks John but that's Jims motor. Mine is still in the the trailer. I'll start on it after Hallett.

The tech spec book says 88. If you run the math, an 88mm stroke with 104 bore comes out to 2990, which is the published displacement. If the crank was only 87.8, the displacement would be only 2983. I've never actually measured one though...

3L crank is 88mm just had one measured last week while examining a newly purchased 3L cranK.

As ususal Ski, you're the man. i have a lead on a crank, but never really knew the diff. in the two terms...'long block","Short block" In essence "long block" means that the engine has been built up "vertically" from the block, and "short" means that the bottom end is complete. I didn't want to dig up the dumb assed quesion thread that i started, but I'll add this.( Ski the pics really help us atist types.)

p.s. John, if anyone trades in a stage V kit, let me know. or is it stg IV......anyway, the one for a 3.0 8 valve.

Engine M44/43


M44/44 (Tiptronic)
Number of Cylinders 4
Bore 104 mm
Stroke 87.8 mm

Ok, 88mm, the above is copied from Clarks-Garage...but I know different now.