Advice on stroker build with cracked cylinder

nm9stheham said
If I may... DCR is a fixed computation. I'd call what moper speaks about as 'effective CR' or 'effective DCR' which adds in the effects of volumetric efficiency (like which varies with RPM's), any intake pressure from turbo-or-super-charging, and altitude effects (negative turbo-charging).

If you don't start with knowing your DCR, then you don't have any chance of knowing where your 'effective DCR' will end up, unless you:

Build the same thing as before

Just randomly experiment

Just looking for thoughts/opinions here... Isn't the VE at cranking speeds assumed as 100% in the DCR computations? Since it only considers the intake effects, and ignores any exhaust effects (like reversion), then it seems to be so. If that is true, then 'effective DCR' would typically peak only a few % above computed DCR. But I am not 100% sure on that aspect, so would welcome comments.

"They ain't lazy"? The suggestion was made that he lay in some $$ for tires a few posts back LOL

I was thinking about this while puttering around the house before and you're right NM - I had pressure and ratio mixed up. Ratio won't change. Pressures will. I thinking about it (I didn't go look it up) that VE at cranking will always be 100%. It has to be because there's no actual dilution, no power stroke, and no blowdown. Meaning all the dynamic things are not present at that low an rpm. But a good street engine wil go 110%+, and a good race engine go 115%+. So the pressures will change as the physics of the running engine come into play.

Edit - My position of "it's too much overthinking" is still unchanged however...lol. Unless this is a max effort in every part choice and a specific performance window to hit, it's not really relevant beyond setting up for the static ratio and estimating the dynamic ratio in regard to cam choice.