502 Dyno numbers
05-21-2002, 08:03 PM
#1
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Join Date: Mar 2001
Location: st. clair shores mi ,us
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502 Dyno numbers
I found my dyno sheets from my old 502.
This motor had iron oval port (Merlins) , with a Brodix intake , 1050 dominator and 8:5.1 CR.
The cam is a solid roller.
.715/.715 258/[email protected] on a 112 , I think we had in installed 4 deg advanced.
These dyno pulls were using 89 octane gas. And 34 degrees of timing.
At 4000rpms the torque was at 522 and it peaked 571ft/lbs at 5100rpms, it stayed at around 560 ft/lbs all the way to 6000rpms.
At 5800rpms it had 620hp , 625hp at 6000rpms.
I ended up grenading this motor. I purchased one of those Carter mechanical fuel pumps from CPperformance that I was told would work in place of the Merc fuel pump (Gen6) well that was a joke, when I put a gauge on it I think it had 2lbs of fuel pressure, not even enough to keep the float bowls full. The combination of that and a major reversion problem caused the motor to detonate to death.
I have all those problems fixed and now am even happier with the 540 !
Now I have the same heads ,cam , intake on a 540 and we bumped the CR to 9.1
A question i have is the 502 made 1.245 hp per cubic inch , am I safe to say that the 540 is making 670-675 ?
This motor had iron oval port (Merlins) , with a Brodix intake , 1050 dominator and 8:5.1 CR.
The cam is a solid roller.
.715/.715 258/[email protected] on a 112 , I think we had in installed 4 deg advanced.
These dyno pulls were using 89 octane gas. And 34 degrees of timing.
At 4000rpms the torque was at 522 and it peaked 571ft/lbs at 5100rpms, it stayed at around 560 ft/lbs all the way to 6000rpms.
At 5800rpms it had 620hp , 625hp at 6000rpms.
I ended up grenading this motor. I purchased one of those Carter mechanical fuel pumps from CPperformance that I was told would work in place of the Merc fuel pump (Gen6) well that was a joke, when I put a gauge on it I think it had 2lbs of fuel pressure, not even enough to keep the float bowls full. The combination of that and a major reversion problem caused the motor to detonate to death.
I have all those problems fixed and now am even happier with the 540 !
Now I have the same heads ,cam , intake on a 540 and we bumped the CR to 9.1
A question i have is the 502 made 1.245 hp per cubic inch , am I safe to say that the 540 is making 670-675 ?
Last edited by 26scarab; 05-21-2002 at 10:10 PM.
05-21-2002, 10:29 PM
#3
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No opinion this time, but I DO have a question----If the Carter mechanical fuel pump didn't work then which fuel pump did you end up using that worked well?. The new Holley's I installed last year aren't holding up to their advertised pressures. I was told to use an Edlebrock fuel pump with an external regulator, and I was just curious as to which one you ended up with? Thanks in advance
05-21-2002, 10:39 PM
#4
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The bump in compression and the extra cubes using the same cam will make things happen at a lower RPM than on the 502. That is probably good since you are running oval port heads. I would say your guess is close with max hp at 5800 to 6200 rpm. You probably have more torque down low. Only a guess. I see your torque curve is pretty flat. That is one of the benefits of a roller cam. It extends rpm range on both ends of the curve. Nice combo.
