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Re: Low deck Indy 540 on the dyno
[Re: AndyF]
#3225360
04/06/24 09:00 AM
04/06/24 09:00 AM
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Joined: Mar 2003
Posts: 2,497
PA
moparacer
top fuel
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top fuel
Joined: Mar 2003
Posts: 2,497
PA
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Yes, his carb needs to be reworked. It is a 3 circuit Holley that hasn't been modified and the intermediate circuit floods the engine at certain throttle positions. Evidently it runs okay from him at the track because of his two step and then being WOT down the track, but it was super rich on the dyno when we were trying to start the pulls. But the engine showed some signs of being run rich so we told him to either buy a two circuit, or to get someone to rework his carb.
The dyno carb is a box stock Holley 1050 XP. It works great on every engine we use it on. Usually don't even need to change jets in it. I had problems footbraking 3 circuit Dominators, and always converted them to 2 circuit. Not that big of a deal to do.
Last edited by moparacer; 04/06/24 09:01 AM.
67 Barracuda street/bracket car 11.27-119
68 Dart 502 BB 8.70s-152
414 cid SB Dragster 7.65-174
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Re: Low deck Indy 540 on the dyno
[Re: moparacer]
#3225370
04/06/24 09:45 AM
04/06/24 09:45 AM
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Joined: Jan 2003
Posts: 9,986
Frostbitefalls MN (Rocky&Bullw...
gregsdart
master
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master
Joined: Jan 2003
Posts: 9,986
Frostbitefalls MN (Rocky&Bullw...
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Things that come to mind are what rocker ratio, the lash amount and intensity of rhe cam, thickness of the rings, and the effect of the intake/adapter combo, and how much room for improvement there might be in those areas?
My first 440-1 build after porting the heads made over 840 hp with a similar cam but injected methanol. So i bet the things i mentioned may be holding it back from 850 hp.
Last edited by gregsdart; 04/06/24 09:47 AM.
8..603 156 mph best, 2905 lbs 549, indy 572-13, alky
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Re: Low deck Indy 540 on the dyno
[Re: AndyF]
#3225395
04/06/24 11:28 AM
04/06/24 11:28 AM
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Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,493
So. Burlington, Vt.
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Did you guys do any work on that engine…….or was it just there for a dyno test?
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: Low deck Indy 540 on the dyno
[Re: AndyF]
#3225420
04/06/24 01:30 PM
04/06/24 01:30 PM
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Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
GomangoCuda
master
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master
Joined: Jan 2003
Posts: 4,712
Moved to N.E. Tennessee
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Is it just me or are those dyno headers kind of small for 850-900 hp?
In theory, there is no difference between theory and practice. In practice, there is.
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Re: Low deck Indy 540 on the dyno
[Re: AndyF]
#3225437
04/06/24 03:03 PM
04/06/24 03:03 PM
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Joined: Jan 2003
Posts: 16,923
NC
440Jim
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 16,923
NC
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From what I've seen over the years only about 5% of the customers are actually interested in finding more power after a dyno session. Most customers just want to get the engine home so they can put it in the car and get back to racing. Did the owner at least have a few ignition timing settings tested? The combination 4150 intake with carb adapter to 4500 may have limited top rpm power capability at 540 CID. It would be interesting to see how the HP held up past peak. It might benefit from a higher shift point.
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Re: Low deck Indy 540 on the dyno
[Re: 440Jim]
#3225441
04/06/24 03:16 PM
04/06/24 03:16 PM
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Joined: Jan 2003
Posts: 31,002
Oregon
AndyF
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,002
Oregon
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From what I've seen over the years only about 5% of the customers are actually interested in finding more power after a dyno session. Most customers just want to get the engine home so they can put it in the car and get back to racing. Did the owner at least have a few ignition timing settings tested? The combination 4150 intake with carb adapter to 4500 may have limited top rpm power capability at 540 CID. It would be interesting to see how the HP held up past peak. It might benefit from a higher shift point. That is a good point. The 4150 to 4500 trick might work great on a 440 to 500 inch engine but not so great at 540 inches. I tested it on my 514 and the best intake for that engine was a 4500 intake. The Super Victor worked best for me. The 440-3 was okay, the 440-3x didn't make more power. I think all runs were made at 35 degrees. I don't recall changing the timing on it.
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Re: Low deck Indy 540 on the dyno
[Re: fast68plymouth]
#3225444
04/06/24 03:26 PM
04/06/24 03:26 PM
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Joined: Jan 2003
Posts: 31,002
Oregon
AndyF
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,002
Oregon
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Did you guys do any work on that engine…….or was it just there for a dyno test? It got rings and bearings, upgraded to a belt drive, fixed some issues. I think the short block was built by Indy originally but I might be wrong.
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Re: Low deck Indy 540 on the dyno
[Re: AndyF]
#3225742
04/08/24 09:25 AM
04/08/24 09:25 AM
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Joined: Jan 2003
Posts: 10,021
MN
JERICOGTX
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,021
MN
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From what I've seen over the years only about 5% of the customers are actually interested in finding more power after a dyno session. Most customers just want to get the engine home so they can put it in the car and get back to racing.
Most customers don't want to spend the extra dyno money. Also, there is zero reason to test stuff that doesn't fit the car. Why test carb spacers, if you don't have room for them? What good are dyno headers if they don't fit your chassis, other than they fit the dyno?
69 GTX
68 Road Runner
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