How much HP can I make with...
06-11-2002, 04:22 PM
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How much HP can I make with...
What's an honest number of hp I could make with a naturally aspirated 540? I would probably run the Dart Pro 1 310cc runner aluminum heads and a Barry Grant Dominator with Stainles Marine exhaust. I would want a healthy cam but be able to idle without major concern and have a fully rollerized valve train. I would want the compression to be either 9:1 or 9.5:1. What would be the difference in hp between the two ratios?
Last edited by SR-24; 06-11-2002 at 04:24 PM.
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06-11-2002, 04:31 PM
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Katdrvr, what would be the difference with a compression ratio of 9:1 and one with 9.5:1? If not much i would go with the 9:1 in case I wanted to supercharge later on. Could I run 5lbs. of boost with an intercooler for both or would I be pushing it with either one?
06-11-2002, 04:47 PM
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I do not know what HP difference between the 2 compression ratios would be but if you are planing to put a blower on it I would not go over 8.5 at max. Tearing up motors is not a fun thing to do. Procharger had a 502 putting out 565HP with marine exhaust natural before they put blower on it. With 10lbs they made i think 980HP with 10lbs. The lower the compression the more boost you can add safetly.
06-11-2002, 05:20 PM
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My 540 dynoed out at 683 @ 5680
They didn't take the dyno any higher because of the hyd. roller cam.
So I probably got 600 to 625 at the prop @ 5300 to 5400.
My SR-24 is running around 84 to 88 with two people and 60 gals of fuel.
Barry from PA came down one weekend. We have the same 1.36 gear, same cu in, and dyno sheets were very close and we ran side by side on a somewhat cool summer day at around 88.
So I probably got 600 to 625 at the prop @ 5300 to 5400.
My SR-24 is running around 84 to 88 with two people and 60 gals of fuel.
Barry from PA came down one weekend. We have the same 1.36 gear, same cu in, and dyno sheets were very close and we ran side by side on a somewhat cool summer day at around 88.
06-11-2002, 09:15 PM
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SR-24,
My 540 is putting out around 675 with 9:1CR.
It's doable (?) but your going to have to spend some money on the heads, intake and cam development, especially if you want to use a hydralic roller.
Here's some info from an earlier post of mine:
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 !
My 540 is putting out around 675 with 9:1CR.
It's doable (?) but your going to have to spend some money on the heads, intake and cam development, especially if you want to use a hydralic roller.
Here's some info from an earlier post of mine:
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 !
06-12-2002, 09:19 AM
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Too Old, I wanted to build a 572 but I'm pretty sure you have to have a tall deck and I just have a standard height 502. Thanks for all the info from everyone. I don't know what to do, it seems so easy to just bore my 502 to 509 and put a blower on and make more horsepower, but I don't know if I want the headaches of trying to dial one in. What would you guys do if you had a standard 502? The only other thing is my crank is already 20/20 so I would probably have to buy a new crank anyway.
06-12-2002, 11:12 AM
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SR-24;
In my opinion you need more head for that Motor. A 310 would really choke it down unless you only want to turn 5000 rpm. I would go with the Dart 345 Pro 1, (the 325 as a BARE minimum)10.00:1 CR, Dart or Merlin Intake and a 975 BG Race Demon. With Hyd roller you should make close to 700hp, solid maybe 750hp @6200, 775 if you really buzz it (like 6700). BG does a good job setting up their carbs..near perfect out of the box if you give the tech guys all your info. Dominators can be a real headache to get dialed in...I have been there and done that.
My 632 has Dart 360 fully ported and polished heads, 10.5:1 CR, dart tunnell ram, 2X775 race demons, 280/288 .785/.760 lift on 115 centerline. Made 901HP@6700. I run 93 Octane with never a sign of detonation, but your cam choice is critical to bleed down cylinder pressures.
In my opinion you need more head for that Motor. A 310 would really choke it down unless you only want to turn 5000 rpm. I would go with the Dart 345 Pro 1, (the 325 as a BARE minimum)10.00:1 CR, Dart or Merlin Intake and a 975 BG Race Demon. With Hyd roller you should make close to 700hp, solid maybe 750hp @6200, 775 if you really buzz it (like 6700). BG does a good job setting up their carbs..near perfect out of the box if you give the tech guys all your info. Dominators can be a real headache to get dialed in...I have been there and done that.
My 632 has Dart 360 fully ported and polished heads, 10.5:1 CR, dart tunnell ram, 2X775 race demons, 280/288 .785/.760 lift on 115 centerline. Made 901HP@6700. I run 93 Octane with never a sign of detonation, but your cam choice is critical to bleed down cylinder pressures.
