RPM Lug
#1
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Join Date: May 2007
Location: Stevensville, Md
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RPM Lug
have pair of carburetor 540's with 28pitch Bravo 4 blades turning 4600 R's is this lugging? or should I drop down in pitch for better performance? My cruise speed is great 50 mph at 3200
#2
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Depends on a few factors.
1) what cams (rpm range)
2) what drives and ratio (1.5:1 or 1.36:1)
I quick thought would be you have 600-800rpm left. I'd say if all adds up a 4 blade 24-25 would be a perfect set-up and easier on the drives.
1) what cams (rpm range)
2) what drives and ratio (1.5:1 or 1.36:1)
I quick thought would be you have 600-800rpm left. I'd say if all adds up a 4 blade 24-25 would be a perfect set-up and easier on the drives.
#4
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iTrader: (3)
"cruise" speed will always be faster with more pitch. However, the load on the engine, with the 28 pitch props at 3200, is much higher, than if it had say, some 25 pitch props at 3200.
Sounds overpropped to me. Like these guys said, it depends on your engine package. IF your engine makes peak torque at 4600, and peak HP at 5500, running it at 4600 wide open, is not good in my opinion.
Sounds overpropped to me. Like these guys said, it depends on your engine package. IF your engine makes peak torque at 4600, and peak HP at 5500, running it at 4600 wide open, is not good in my opinion.
#6
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iTrader: (7)
"cruise" speed will always be faster with more pitch. However, the load on the engine, with the 28 pitch props at 3200, is much higher, than if it had say, some 25 pitch props at 3200.
Sounds overpropped to me. Like these guys said, it depends on your engine package. IF your engine makes peak torque at 4600, and peak HP at 5500, running it at 4600 wide open, is not good in my opinion.
Sounds overpropped to me. Like these guys said, it depends on your engine package. IF your engine makes peak torque at 4600, and peak HP at 5500, running it at 4600 wide open, is not good in my opinion.