Avanti R3 Power!

[mfg]

The Avanti R3 engine powering George Krem's "Plain Brown Wrapper" has produced, under controlled conditions on an engine dynamometer, approx ....?.... horsepower!

1) 375.....2) 410.....3) 440.....or.....4) 475

[Dwight FitzSimons]

I will guess 410 HP.

--Dwight

[mfg]

2 hours ago, Dwight FitzSimons said:

I will guess 410 HP.

--Dwight

Close...but no cigar Dwight!

[mfg]

All through here?

[pantera928]

375

[Avanti83]

I'll guess 440 as he probably runs higher boost than average. 300 or so hp without boost would be about 420 at 6 psi boost more or less.

[pantera928]

One of us will be right as i do not believe it is 475

[mfg]

On 3/20/2022 at 11:02 AM, pantera928 said:

375

Sorry, not 375HP

[mfg]

On 3/20/2022 at 11:51 AM, Avanti83 said:

I'll guess 440 as he probably runs higher boost than average. 300 or so hp without boost would be about 420 at 6 psi boost more or less.

440HP is CORRECT....WOW!

[pantera928]

53 minutes ago, mfg said:

440HP is CORRECT....WOW!

Wow! THat would be impressive even by today's standards

[mfg]

23 hours ago, pantera928 said:

Wow! THat would be impressive even by today's standards

Agreed!

[VtMike]

On the issue of extra boost.  I recall a statement by George Krem indicating that his R3 engine came with the high boost pulley, and that he had not made any change.  

Do we know at what RPM his R3 was making 440 hp?  I believe the rating of 335 was at something like 5200?  And I recall reading that the boost was likely to increase a good bit at higher RPMs?  

On the other hand, I recall also reading that Ted Harbit had strict instructions from George not to exceed 6000 rpm while racing, so he may have given the same instructions to the dyno guys?

I would love to see the dyno HP of Ted's Stude Tomato.  I believe he has recorded times that were very close to George's R3?  

 

[mfg]

10 minutes ago, VtMike said:

On the issue of extra boost.  I recall a statement by George Krem indicating that his R3 engine came with the high boost pulley, and that he had not made any change.  

Do we know at what RPM his R3 was making 440 hp?  I believe the rating of 335 was at something like 5200?  And I recall reading that the boost was likely to increase a good bit at higher RPMs?  

On the other hand, I recall also reading that Ted Harbit had strict instructions from George not to exceed 6000 rpm while racing, so he may have given the same instructions to the dyno guys?

I would love to see the dyno HP of Ted's Stude Tomato.  I believe he has recorded times that were very close to George's R3?  

 

You make an interesting point...Horsepower does seem to go through the roof on supercharged engines where the driver never lifts his foot...It's been said that Granatelli used to push the R3 in 63R1025 to 7500-8000 RPM to "Beat the Hemis"....

All it really takes is a big wallet, and a few spare engines sitting back at the garage!!!