help with HP calculations
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help with HP calculations
hi there .... finally got my 7.3 IDI turbo back in my boat ! here"s the deal ...
i have 2x 7.3 IDI turbo "93 in my boat . "star powr" marinised them . they rate them at 260 HP ? they each have a aftercooler and 5 inch exhausts . also the water system is cooled by heat exchanger from the sea water . so , over heating not a problem . does anyone know if it is possible with the aboved mentioned items to get 260 HP out of these engines and what sort of max RPM"S am i looking at ? thank you in advance
viv
i have 2x 7.3 IDI turbo "93 in my boat . "star powr" marinised them . they rate them at 260 HP ? they each have a aftercooler and 5 inch exhausts . also the water system is cooled by heat exchanger from the sea water . so , over heating not a problem . does anyone know if it is possible with the aboved mentioned items to get 260 HP out of these engines and what sort of max RPM"S am i looking at ? thank you in advance
viv
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From: Nutter Fort, WV
260 HP should be no problem with the exhaust system a boat normally has.
Are you thinking they are delivering less than 260 HP?
A 7.3 is normally goverened to something between 3300 and 3600 RPM.
Are you thinking they are delivering less than 260 HP?
A 7.3 is normally goverened to something between 3300 and 3600 RPM.
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thanks dave ... not sure on output HP??? need to find out HP as i have to work out what size props to put on . seems like , now i can get 3700 - 3900 rpm , which i dont think is right for any motor !!
Post Fiend
Joined: Nov 2003
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From: Nutter Fort, WV
Is that no load RPM or is that what you are able to run with the prop you have on it now?
The supplier should have run several on a dyno to be able to rate them at 260 HP.
Do you have any idea how much boost the turbo is putting out?
Do you have any idea what you are running for EGT?
Ford rated the engine very conservatively since they were developing the Power Stroke at that time.
No one would spend the money for a Power Stroke engine if the IDI was putting out as much or more power.
Also the exhaust they used choked the turbo down quite a bit.
Your radiator is big enough to be able to run at max HP for hours without overheating, that is not true for trucks.
Also the oil cooler would be able to do a much better job cooling the oil in a boat.
The supplier should have run several on a dyno to be able to rate them at 260 HP.
Do you have any idea how much boost the turbo is putting out?
Do you have any idea what you are running for EGT?
Ford rated the engine very conservatively since they were developing the Power Stroke at that time.
No one would spend the money for a Power Stroke engine if the IDI was putting out as much or more power.
Also the exhaust they used choked the turbo down quite a bit.
Your radiator is big enough to be able to run at max HP for hours without overheating, that is not true for trucks.
Also the oil cooler would be able to do a much better job cooling the oil in a boat.
Last edited by Dave Sponaugle; Apr 13, 2007 at 05:27 PM.
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