555 BBC
4.25 stroke
long rod
9.8/1 C/R
dart 360 cnc ported heads
2.3 intake
hyd roller 240 @ 050
dart single plane intake
motec efi
msd 7 34 degrees lead
92 octane
750 ft lbs
735 hp
> -----Original Message-----
> From: owner-land-speed@autox.team.net
> [mailto:owner-land-speed@autox.team.net]On Behalf Of Daniel Wright
> Sent: Wednesday, June 30, 2004 12:53 PM
> To: land-speed@autox.team.net
> Subject: An interesting study of bore and stroke
>
>
> 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
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