Dyno
Team Owner
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From: Sitting in his Nowhere land Hanover Pa
2024 C2 of the Year Finalist - Unmodified
2015 C2 of Year Finalist
that is a loaded question. we are going to need the know whats in the engine the carb and its settings and a lot more things need to be looked at
Race Director
Joined: Oct 2005
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From: Camp Verde AZ
C1 of Year Finalist (performance mods) 2019
2017 C1 of Year Finalist
Need more info about CR and exhaust and intake system, heads and cam.
For a ~9:1 or 9.5:1 CR motor, the Tq is about right.
Doug
Thread Starter
Drifting
Joined: Oct 2008
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From: Woodstock GA
For $45 I said what the heck. They only took it up to 5000 rpm's in forth gear. I wanted to find out before dropping my 327 back in. I think its a good candidate for a 383 being a 70 4 bolt main. I will be selling the 350 short block after I put the 327 back in.
Last edited by VetteRed1965; Mar 5, 2011 at 08:37 PM.
Tech Contributor
Joined: May 2005
Posts: 15,576
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From: Conroe Texas
255 rwhp = 311 at the crank, assuming an 18% driveline loss
255 rwhp = 300 at the crank, assuming a 15% driveline loss
Either way, it's in the low 300 range. Probably a typical street motor out of a camaro or something.
For comparison, a true L79 350 horse car would be 287 rwhp with an 18% driveline loss, so your numbers are in the ballpark.
255 rwhp = 300 at the crank, assuming a 15% driveline loss
Either way, it's in the low 300 range. Probably a typical street motor out of a camaro or something.
For comparison, a true L79 350 horse car would be 287 rwhp with an 18% driveline loss, so your numbers are in the ballpark.
Race Director
Joined: Jan 2003
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From: Central Arkansas
255 rwhp = 311 at the crank, assuming an 18% driveline loss
255 rwhp = 300 at the crank, assuming a 15% driveline loss
Either way, it's in the low 300 range. Probably a typical street motor out of a camaro or something.
For comparison, a true L79 350 horse car would be 287 rwhp with an 18% driveline loss, so your numbers are in the ballpark.
255 rwhp = 300 at the crank, assuming a 15% driveline loss
Either way, it's in the low 300 range. Probably a typical street motor out of a camaro or something.
For comparison, a true L79 350 horse car would be 287 rwhp with an 18% driveline loss, so your numbers are in the ballpark.
I don't disagree with the above but it brings up something I've been meaning to post for discussion about chassis dyno results. It would seem to me that driveline results can't be equated to a flat % loss. It takes so much HP to overcome bearing and bushing friction losses, gear drive losses, rotational inertia - whatever. So, if that amounts to for example, 75 HP driveline loss - that will be 25% on a 300 HP car but only 12.5% on a 600 HP thumper. Does this sound logical?
Dan
Thread Starter
Drifting
Joined: Oct 2008
Posts: 1,901
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From: Woodstock GA
I don't disagree with the above but it brings up something I've been meaning to post for discussion about chassis dyno results. It would seem to me that driveline results can't be equated to a flat % loss. It takes so much HP to overcome bearing and bushing friction losses, gear drive losses, rotational inertia - whatever. So, if that amounts to for example, 75 HP driveline loss - that will be 25% on a 300 HP car but only 12.5% on a 600 HP thumper. Does this sound logical?
Dan
Dan
I was the only C-2 with a bunch of C-5's and C-6's. I can say it did sound the best ! The c-5's
were pulling 370hp to 400hp rwhp,but they took them up to 6500 rpm's instead of 5000 rpm's
Last edited by VetteRed1965; Mar 6, 2011 at 08:37 AM.
Race Director
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From: Central Arkansas
Or something along those lines. The engine dyno results measured at the flywheel obviously do not take into account driveline losses (and some engine accessory losses depending on the dyno setup). The Chassis dyno takes all those losses into account and will always be lower. I'm just not sure the driveline losses are best accounted for as a flat % of rear wheel horsepower. Seems to me that while they may not be an absolutely fixed amount for a given chassis - they should be close to it.
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Thread Starter
Drifting
Joined: Oct 2008
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From: Woodstock GA
Le Mans Master
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From: Prescott Arizona
Thread Starter
Drifting
Joined: Oct 2008
Posts: 1,901
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From: Woodstock GA
2-1/2 Ramshorn, side pipes with 2-1/2"I.D chambered exhaust. 5000 rpm's. They did not want to wind it up to 6000. I do not know if it peaked. I wish I knew that answer...
Le Mans Master
Joined: Oct 2000
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From: Santa Ana CA
One of my older dyno sheets on my 331 CI, 9.5:1 CR. Note that the power maxes at ~5,600 RPM so there is no sense in spinning the engine up to 6K where the valves start to float. Based on the torque/HP ratio and it's a bigger engine, yours would be maxing out lower, probably around 5K.
Last edited by toddalin; Mar 6, 2011 at 03:52 PM.
Melting Slicks
Joined: Jun 2008
Posts: 2,111
Likes: 30
From: Columbia, SC
Undercar exhaust, the CC N11 set. To the best of my knowledge, everything except the HEI distributor is factory spec.
I did 3 pulls, this was the highest torque. But all 3 were within about 2hp, 3ft-lbs of each other. 5500rpm was 125mph on the screen. Speed doesn't make the printout though.
