Re: [Amc-list] Compression Ratio: Static, Dynamic

[adh@xxxxxxxxxxxxxxxxx (Sandwich Maker)]

" From: Wrambler242@xxxxxxxxxxx
" 
" 
" All your really doing is changing the cylinder pressures, not changing
" the actual compression ratio.

but the cylinder pressure can also be expressed as a compression ratio,
relative to atmospheric pressure.

" Way back in the 70's or 80's Hotrod built a circle track type tow rig
" box van with about 12-1 static compression and bled the pressure off
" with some "high tech" cam etc to supposedly get optimum whos-is and
" what-is out of the SBC. They succeeded in getting a decnet amount of
" power and about 14-15mpg IIRC.
" That was many years ago and that's about all I remember about that
" specific experiment. Whoever was making the cams, Crane?, was trying
" to create a "new" niche during the fuel crunch of the 70's IIRC. Don't
" think that idea went far.

i recall some experiments with radically different intake and exhaust
durations.  a long intake would cut cylinder pressure while a short
exhaust would recover more low end power.  i don't think the concept
really had much value.

" Guys over on the stroker list have been using the cam design to make
" the lowbuck strokers more driveable by bleeding off some of the
" pressue for less ping. Since the engine is stroked the cubic inches
" make up for the drop caused by cam overlap.

that's kind of a crutch solution though, because cams are cheaper and
easier to get than custom pistons.  you end up with an engine that's
bigger but makes no more low end power.
________________________________________________________________________
Andrew Hay                                  the genius nature
internet rambler                            is to see what all have seen
adh@xxxxxxxxxxxxxxxxx                       and think what none thought
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