maybe i’m too tired to think straight but here is my problem. this was posted on shoforum in a group buy for stroker cranks.
Using the formula for displacement:
pi times radius squared times the stroke times 6
The original 3.0 has a bore of 3.5" and stroke of 3.15" which gave you a displacement of ~182ci or 2.982L
3.14 * 3.0625 * 3.15 * 6 = 182
The 3.2 has a bore of 3.62" and stroke of 3.15" which gave you a displacement of ~195ci or 3.195L
3.14 * 3.2761 * 3.15 * 6 = 195
The 3.6 has a bore of 3.62" and a stroke of 3.5" which gave you a displacement of ~216ci or 3.541L
3.14 * 3.2761 * 3.35 * 6 = 216
The 3.6L is a 3.2 with a .35" increase in stroke to 3.5".
The 3.4L was a 3.2 with sleeves and bored out to 3.75" which equaled 208.7ci or 3.419L
The custom 3.4L stroker that I am aware of has an offset grind to get a .25" increase in stroke with 3.62" pistons.
The stroker crankshaft is made from a new billet forging and not welded, offset ground and reharden as before. Since we SHO owners don’t have the same volume as 383 Chevy stroker cranks we pay much more for the custom made crankshaft.
Hopefully this cleared things up.
so lets take this example.
The 3.2 has a bore of 3.62" and stroke of 3.15" which gave you a displacement of ~195ci or 3.195L
3.14 * 3.2761 * 3.15 * 6 = 195
where did the 3.2761 come from?
the reason I ask is that the spare SHO block sitting in my garage can be over bored and resleeved to 3.4 or 3.75" and I would like to calculate a 3.75 bore with a 3.6 stroke. that should be a interesting engine.
a company a long time ago used to offer 3.4 blocks (over bored and resleeved) but many of them failed shortly because the quality of the sleeves was very inconsistant and they were either cranking or distorting.
on a 3.6 stroker engine with 10psi mild cams and head work they made 510whp and snapped the crank on 3 of 4 cars. but the origional stroker cranks were essentialy regrinds and were not up to the high rpm duty these new ones should be. if i get this new job there will be a few :present: at my door. come summer time :eekdance:
so about that calculation.
