Hi
In selecting the unspecified components, such as heads, intake, carb, oil
pan, and headers, I made very conservative choices from the basic default
selections available.If I swap ONLY the heads I selected (canted stock
valves, oval ports, mild pocket ported) for something more aggressive like
canted large valve (2.04-1.95), rectangular ports, fully ported, with no
other changes except to correct from the incorrect "hydraulic" cam choice
to "Roller", (I had missed the "Roller" part of the cam description) I get
the following numbers.
SS torque peak 677 @ 5500
LS torque peak 698 @ 5500
SS HP peak 827@7500
LS HP peak 850 @ 7500
If I throw in a really radical Roller cam profile, Stepped Racing headers,
a tunnel ram intake rather than the dual plane unit I had specified, and
those numbers go to
torque 743 @ 6000
HP 991 @ 8000
I learned years ago, (from reading Hot Rod instead of doing my schoolwork)
proper selection of heads, cam, intake and exhaust makes or breaks an
engine build.
As always, I crave more information, what heads are you using? how much cam
lift??
Dan
>Well, aside from the fact that it's only off by about 150 to 200 hp and
>about the same lb-ft...
>DF
>Hi
>I ran this information thru the Desktop Dyno computer program. I got the
>following information, which should be regarded as Desktop Dyno's Opinion.
>The Long Stroke (LS) version made slightly more torque from 2000-3500 RPM,
>then the Short Stroke (SS) version takes over and makes more power from
>3500 thru the rest of the rpm range.
>A few comparison points are
>SS torque peak 524 @ 5000
>LS torque peak 504 @ 4500
>SS HP peak 567 @ 6500
>LS HP peak 520 @ 6000
>
>
>I don't intend this as an endorsement of Desktop Dyno Software, it is just
>one way of looking at this comparison. This computer program makes many
>assumptions in order to simplify the task. Those assumptions reduce it's
>effectiveness and accuracy, but it does offer some useful information,
>particularly in direct comparison of a single part change. More
>information on the heads and cam would be helpful.
>If anyone would like a copy of these files to fool with in Desktop Dyno,
>email me off list and I would be glad to email them.
>Dan
Daniel Wright
University of Utah
20 S 2030 E
BPRB Rm 332
Salt Lake City, Ut 84112-9454
email daniel.wright@genetics.utah.edu
801-585-7863
FAX 801-585-7177
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