[Shotimes] Daytona 500 & NASCAR HP

[Ron Porter]

When you get to the more highly-strung engines, the peak torque is MUCH
closer to the peak HP.

Even on cars like the S2000 Honda. The original engine had 153 lbs/ft @
7,500, with the HP of 240 @ 8,300. In 2004, they increased the stroke a bit,
so the engine is a bit more streetable with 161 lbs/ft @ 6,500, and the same
240 HP now @ 7,800.

Ron Porter

-----Original Message-----
From: shotimes-admin@autox.team.net [mailto:shotimes-admin@autox.team.net]
On Behalf Of Mark Nunnally
Sent: Tuesday, February 21, 2006 1:17 PM
To: cmichaelo@optonline.net
Cc: 'shotimes'
Subject: Re: RE: [Shotimes] Daytona 500 & NASCAR HP

>Usually cars don't make peak torque at max rpm. 

race cars do :)  or at least much closer to it than a street engine...

>So it doesn't make sense to calculate TQ from 850HP @ 9000RPM, unless we
know that the car makes max TQ at 9000RPM.

No, you are right (at least in street engine applications), and peak torque
probably is slightly lower in the rpm band with a cup motor as well, but I
bet it's not much lower.  They are gonna be set up to make their peak torque
(or as close to it as possible) in their operating range (7k-9k on a typical
track)

>I guess I should have been more specific and asked what is PEAK torque for
the Nascars?

I doubt you are gonna find an exact pubished number on that, at least from a
top running team.  They stay pretty tight lipped on such numbers.

500 ft/lb from a 358 cub engine is like 1.4 ft/lb per cub, which is probably
about as effecient as you are gonna get on a 12:1 CR pushrod V8 with a carb.
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