Sokypuller
New User
I was wanting to know if someone can tell me the compression height difference between a wd allis and a wd45 allis what I'm trying to do is up my compression with little or no machine work thanks in advance for all of your help
- Thread starter Sokypuller
- Start date
Sokypuller
New User
Would that give the wd pistons a larger compression height or would the 45 pistons be closer to the top of my block using a 4 inch wd crank
Aaron SEIA
Well-known Member
I think you go backwards using 45 pistons on a 4" crank. Best bet for a 4" crank is M&W pistons, or some high altitude stock ones. I have 175 pistons on a 4" crank in my WC and it dyno'd 32 horse at Old Threshers a couple years ago. Roughly stock power. A 45 crank is a direct drop in, that really opens up your options. Uses the same rods.
AaronSEIA
AaronSEIA
Just askin
New User
So what is the best piston option if I replace WD crank with a 45 crank? Do I use the 45 pistons or WD Pistons? I am also switching to a 4" head, are shorter valve train stands avail? Head bolts I assume have to come from dealer? Thanks in advance.
Tramway Guy
Well-known Member
45 pistons with a WD crank might allow you to run distillate if you want; the compression would be way low.
I overhauled a WD45 a few years back for a guy who wanted a little more "soup" to her. We put in the 1/8 overbore sleeves with D-17 pistons (compression ratio is higher on the D-17) and tweaked up the governer to run it at the D-17 RPM. Otherwise, all stock WD45. We were both pleasantly surprised when he put it on the dyno at a show the next summer... and she was putting out right at 55 hp!
T in NE
Well-known Member
- Location
- Cambridge, Nebraska
Compression height is the distance from the center of the wrist pin to the top of the piston.
Can't think of the term for what you're after. You're asking about height above or below deck.
You need a taller piston to change that number, a longer connecting rod, or a longer stroke.
Can't think of the term for what you're after. You're asking about height above or below deck.
You need a taller piston to change that number, a longer connecting rod, or a longer stroke.
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