Rwhp / Rwtq
Race Director
Joined: May 2000
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Modifications usually improve high rev volumetric efficiency, which keeps torque from falling off at high revs so power increases and often peaks higher, but peak torque does not increase dramatically.
Peak torque is basically a function of displacement and compression ratio, and unless a design is very restrictive aspriation efficiency at the torque peak is high, but then drops off. By mitigating the drop off in VE the engine will make more power in the upper rev range.
Duke
Peak torque is basically a function of displacement and compression ratio, and unless a design is very restrictive aspriation efficiency at the torque peak is high, but then drops off. By mitigating the drop off in VE the engine will make more power in the upper rev range.
Duke
Race Director
Joined: Apr 2000
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Yes the mods will keep the torque from falling off in the higher RPMs and since the Tq and HP curves intersect at 5250 RPM's if the torque is still good at this RPM then the HP is going to climb higher and higher above 5250 RPM's 
Race Director
Joined: Sep 2000
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From: The Top of Utah
Originally Posted by Bob50th
What is it that makes the hp increase more than the torque does as we add mods?
HP = Tq x RPMs / 5252
Therefore it is clear to see, that by definition, the horse power and torque are equal at 5252 rpms, regardless of how meager the torque may actually be at 5252. It is also obvious, that if you raise the rpms at which the torque peak occurs, even without increasing the amount of torque, the horse power increases.
RACE ON!!!
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Joined: Jan 2000
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From: Corsicana, Tx
2020 C2 of the Year - Modified Winner
2020 Corvette of the Year (performance mods)
C2 of Year Winner (performance mods) 2019
2017 C2 of Year Finalist
Yeah...what they said!!
While I love an engine that has killer off idle response and low speed pulling TQ, I REALLY love an engine that keeps on pulling as rpms climb. I hate it when they nose over as they go through peak HP. If you can keep the TQ curve from diving, it's a fun motor!
One of my most enjoyable combos was the last one in my 427. It used a very nice set of ported Merlin oval ports and a relatively mild street roller cam. It made peak HP at 5850 rpm and peak TQ at 4300 rpm. The neat part was that at 7000 rpm it was only down 6 RWHP! THAT is a fun to drive combination!
It would also lug around at 1000 rpm in high gear with 3.36's and not buck or surge. Nice overall drver.
JIM
While I love an engine that has killer off idle response and low speed pulling TQ, I REALLY love an engine that keeps on pulling as rpms climb. I hate it when they nose over as they go through peak HP. If you can keep the TQ curve from diving, it's a fun motor!
One of my most enjoyable combos was the last one in my 427. It used a very nice set of ported Merlin oval ports and a relatively mild street roller cam. It made peak HP at 5850 rpm and peak TQ at 4300 rpm. The neat part was that at 7000 rpm it was only down 6 RWHP! THAT is a fun to drive combination!
It would also lug around at 1000 rpm in high gear with 3.36's and not buck or surge. Nice overall drver.
JIM
