Cummins 5.9L 370hp B Series Mechanical vs QSB electronic

SCA's do more than reduce cavitation. They also contain anti-corrosives and reduce foaming which tend to deplete early in regular antifreeze without SCA's. If you don't check your coolant regularly or change it every other year (Cat owners using Caterpillar ELC only need to change coolant every 5th year), then you should consider using SCA's.
 
Thanks, I will read over the PM, looks to have some great info.

I had planned to pull props and have them scanned this winter due to a variance in fuel burn and load at equal rpm. For example at 2400 RPM
Port Fuel burn - 13.8 GPM
Port load - 78%

Stbd fuel burn - 12.9GPM
stbd load -73%

Does this issue need to be solved before load test can be done?
 
I don't know if that is problem or not as I don't know the WOT rpm's nor your CPL code.

I found one rated at 425mhp, cpl 8732 and it stated at 2400 rpm fuel burn should be 11.7, and you would want to be near that or below that. And since that is the only point on the curve we know I can't tell you that is a problem or not, you should really have more data points to confirm you are overloaded or if that is just one spot on the curve that happens to be a little high. I would get the bottom cleaned, take it for a run and get some more information before anything is done to get a base line. Right now you are just guessing and the needed information is not available yet.
 
trit21 said:
I don't know if that is problem or not as I don't know the WOT rpm's nor your CPL code.

I found one rated at 425mhp, cpl 8732 and it stated at 2400 rpm fuel burn should be 11.7, and you would want to be near that or below that. And since that is the only point on the curve we know I can't tell you that is a problem or not, you should really have more data points to confirm you are overloaded or if that is just one spot on the curve that happens to be a little high. I would get the bottom cleaned, take it for a run and get some more information before anything is done to get a base line. Right now you are just guessing and the needed information is not available yet.
Click to expand...

I see what you mean. I was first concerned about the variance per engine. shouldn't they have equal fuel burn?
 
trit21 said:
I don't know if that is problem or not as I don't know the WOT rpm's nor your CPL code.

I found one rated at 425mhp, cpl 8732 and it stated at 2400 rpm fuel burn should be 11.7, and you would want to be near that or below that. And since that is the only point on the curve we know I can't tell you that is a problem or not, you should really have more data points to confirm you are overloaded or if that is just one spot on the curve that happens to be a little high. I would get the bottom cleaned, take it for a run and get some more information before anything is done to get a base line. Right now you are just guessing and the needed information is not available yet.
Click to expand...

Also do I need to contact Cummings directly to get the correct fuel burn curves?
 
Thanks. I just with the boat was in the water to figure this out. I will do more research this winter.
 
Well, I'm about to confirm the boat with the mechanical 370's


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I will, photo's will go up as I'll be moving from the Sea Ray family


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