Re: All the specs to start your dyno #s guesses! 8^)
[Re: BradH]
#2389825
10/19/17 02:02 PM
10/19/17 02:02 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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A few tid bits..... Water temp will be in the 160's for all the testing. Weather is supposed to be pretty nice this weekend, so air temps would be mid-60's/70's. The dyno exhaust isn't really "open". There are 5" pipes coming off the collectors going through the wall, where they attach to tractor trailer mufflers. Testing will be done at a 300rpm/sec rate. Provided everything is still going smoothly at the end of the session, we'll take the "best" carb/spacer combo and make a cold water "bonzai" pull to try for "the big number"....... But we won't use that run for "scoring" How low I can get the water temp will depend on how many runs we have made up to that point, and what the temp of the water in the storage tank has gotten up to......... But I'd expect to be able to get it down into the 110-120deg range. The cooler temp is usually worth something...... But not always. I think it would be on this motor though.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: fast68plymouth]
#2389841
10/19/17 02:32 PM
10/19/17 02:32 PM
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Joined: Feb 2016
Posts: 201 PA
Scully
enthusiast
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enthusiast
Joined: Feb 2016
Posts: 201
PA
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A few tid bits..... Water temp will be in the 160's for all the testing. Weather is supposed to be pretty nice this weekend, so air temps would be mid-60's/70's. The dyno exhaust isn't really "open". There are 5" pipes coming off the collectors going through the wall, where they attach to tractor trailer mufflers. Testing will be done at a 300rpm/sec rate. Provided everything is still going smoothly at the end of the session, we'll take the "best" carb/spacer combo and make a cold water "bonzai" pull to try for "the big number"....... But we won't use that run for "scoring" How low I can get the water temp will depend on how many runs we have made up to that point, and what the temp of the water in the storage tank has gotten up to......... But I'd expect to be as to get it down into the 110-120deg range. The cooler temp is usually worth something...... But not always. I think it would be on this motor though. How many gallons is the water tank.
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: BradH]
#2389885
10/19/17 04:32 PM
10/19/17 04:32 PM
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Joined: Feb 2003
Posts: 1,646 Ontario,Canada
firefighter3931
top fuel
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top fuel
Joined: Feb 2003
Posts: 1,646
Ontario,Canada
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Good luck ! A Day at the PRH dyno cell is loads of fun and a real learning experience. Baseline WAG ; 645hp@6900/605tq@5200 Best pull : 658hp@7100/617tq@5400
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: BradH]
#2390000
10/19/17 08:17 PM
10/19/17 08:17 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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Lots of good guesses so far........ And a pretty big spread from high to low, so I'm sure someone will be pretty close.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: jwb123]
#2390235
10/20/17 11:28 AM
10/20/17 11:28 AM
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Joined: Feb 2008
Posts: 725 Central TEXAS!!!!
sr4440
super stock
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super stock
Joined: Feb 2008
Posts: 725
Central TEXAS!!!!
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for the fun I like your baseline carb Demon RS next pick would be the Holley ultra hp/xp
688hp 652 torque on the demon baseline carb
705hp 667 torque on the Holley ultra
you mentioned 93 octane fuel my engine program shows that it needs more octane, at least 105
And if you have time it shows that it might like the cam installed heads up at 108, instead of advanced to 104.
The ramp rate the dyno guy pulls the engine at will affect the HP numbers as well. I used 600rpm per second ramp rate for the pull. FYI if he is using the latest version of windyn, it has an inertia correction factor, if set right, the sweep rate will not mater, 600 rpm vs 300 rpm vs step will lay right over the top of each other. Explanation: the inertia correction factor is used to correct for the loss of torque as you accelerate the engine internals and related dyno equipment that is connected to the crankshaft. Without this correction you will get different torque reading @ each sweep rate. Joe
Without Data, you’re just another guy with an opinion.
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: sr4440]
#2390300
10/20/17 02:29 PM
10/20/17 02:29 PM
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Joined: Jan 2003
Posts: 5,487 SoCal
Brian Hafliger
master
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master
Joined: Jan 2003
Posts: 5,487
SoCal
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680Hp@ 6700 and 610Tq@ 5500 base carb. 695Hp@ 6800 and 615Tq@ 5700 best carb.
Brian Hafliger
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: Brian Hafliger]
#2390975
10/21/17 09:40 PM
10/21/17 09:40 PM
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Joined: Feb 2006
Posts: 1,057 The Great White North
RAMM
super stock
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super stock
Joined: Feb 2006
Posts: 1,057
The Great White North
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680Hp@ 6700 and 610Tq@ 5500 base carb. 695Hp@ 6800 and 615Tq@ 5700 best carb. Peak torque cannot and will not occur at that RPM with the engine specs listed. If it does-dyno is screwy. J.Rob
2009 PHR\EMC Competitor 2010 PHR\EMC Competitor 2011 PHR\EMC Competitor 2012 PHR\EMC Competitor 2013 PHR\EMC Competitor 2014 HotRod/EMC Competitor 2015 HotRod/EMC NoShow 2016 HotRod/EMC 3rd place SPEC Bigblock 2018 HotRod/EMC 7th place G3
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: BradH]
#2391303
10/22/17 04:11 PM
10/22/17 04:11 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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The big dyno day was yesterday. I told Brad I wouldn't post up any numbers.......but I can say the motor ran well, and we made I think it was 28 pulls without any "incidents".
I'll also reveal that we tried the "cold water" pulls with two different carbs and got nothing out of that either time. The cooler temps thickened up the oil enough(8-10psi higher oil pressure) to offset any gains from having the heads and intake cooler......so it was a wash. In hindsight, I probably should have tried a run with "lowered" water temps, instead of the relatively cold temps I tried it at(105-110).
He's driving back home today........so I'd think there should be some results posted tonight.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: All the specs to start your dyno #s guesses! 8^)
[Re: BradH]
#2391327
10/22/17 04:54 PM
10/22/17 04:54 PM
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Joined: Jan 2003
Posts: 14,539 So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,539
So. Burlington, Vt.
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I had a really mild 505 on the dyno last week.......the cold water test on that was a 14tq/8hp gain.
I've seen it change the numbers on a 700-800HP BBC by about 25hp.
Just depends on what it is.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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