Hi Scott:
> MY QUESTION IS, can someone help me understand, or point me to a web site,
> how the relationship between the torque and HP values works.
I am not sure how deep you want to get. Horsepower and torque are related by the
formula (first order equation): hp = (torque x rpm ) / 5252. There are several
reference books listed on Harvey Cranes's website - www.harveycrane.com. In
addition, Mopar Muscle and Car Craft have been running some excellent 340 and
360 rebuild artilcles in the last 6 or so months. In these articles they try
various cams and list the dyno results.
> but I would think that an optimum curve would have the HP and torque peak at
about
> the same rpm.
No, they will not (or better not!!!). Actually, your figures are not too bad.
> Will the engine run out of steam at torque peak of 3500 RPM OR contunue to
pull to
> 5500 RPM the HP peak.
I assume you dialed in all the information required by the program (gearing,
converter stall speed and trans. gear ratios if auto, number of gears and ratios
if stick, car weight, exhaust system, carburation vs. injection, etc.), so it
should pull up to 5500 rpm .
Please supply me with the name of the software; I would like to try it.
Regards,
Tom Noonan
Scott H wrote:
> I just got a neat Desktop Dyno program that allows to assemble an engine on
> your computer using any block, bore, stroke, cam, intake, exhaust etc. then
> run a dyno test and even simulate dragstrip runs.
> I have been playing with a lot of different cam specs and am looking for
> someone to help me understand the results.
> I know these programs have their own set of problems but It gives me
> something to do and the results do reflect reality even if the numbers may
> not be 100% accurate
> The engine is a 4" stroke 360 bored .030 over resulting in 408 CID.
> I have been running both small block and big block cam profiles using flow
> rated for mildly ported Edelbrock Aluminum Heads.
> My favorite combination gives me massive torque values, a nearly flat
> horizontal line of 484 lb ft from 2000 RPM to a max of 495 at 3500 rpm. It
> begins to taper down between 4000 and 5500 RPM (from 483 to 348 lb ft) and
> down from there.
> The HP curve rises nicely from 185 hp at 2000 to a peak of 385 at 5500 RPM
> and then begins to taper down.
> MY QUESTION IS, can someone help me understand, or point me to a web site,
> how the relationship between the torque and HP values works. I know that
> more peak torque is better than peak HP especially in a heavier car, but I
> would think that an optimum curve would have the HP and torque peak at about
> the same rpm. In my models the hp always peaks later than the peak torque.
> What is the relationship between the 2 in terms of performance? Will the
> engine run out of steam at torque peak of 3500 RPM OR contunue to pull to
> 5500 RPM the HP peak.
>
> Thanks,
> Scott
>
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