Prop question??
06-09-2011, 12:53 AM
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Prop question??
Hello!! I am a newbie to the site! I have a question of which prop i should change to. I was runnin a 23 foot powerquest with a 23 pitch stainless Mirage, the boat was powered by a 454. I upgraded over the winter to a 502 EFI, and i can barely get 4200 RPM out the boat now. What do I do to get more r's out it? Thank you!!!
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06-09-2011, 11:37 AM
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Pull the 502EFI out and rebuild it?
First off, you should be spinning a 25p prop with that set up, or 24 4 blade. The fact that you can't even spin the same prop as the 330hp shows that somethign is wrong. The weight of the engines is so close that it is a non issue. I would tach the engine directly with something reliable to verify.
Was the 502EFI new or fresh?
If it was used did you perform compression and leak down tests before the install?
First off, you should be spinning a 25p prop with that set up, or 24 4 blade. The fact that you can't even spin the same prop as the 330hp shows that somethign is wrong. The weight of the engines is so close that it is a non issue. I would tach the engine directly with something reliable to verify.
Was the 502EFI new or fresh?
If it was used did you perform compression and leak down tests before the install?
06-09-2011, 11:42 AM
#7
Pull the 502EFI out and rebuild it?
First off, you should be spinning a 25p prop with that set up, or 24 4 blade. The fact that you can't even spin the same prop as the 330hp shows that somethign is wrong. The weight of the engines is so close that it is a non issue. I would tach the engine directly with something reliable to verify.
Was the 502EFI new or fresh?
If it was used did you perform compression and leak down tests before the install?
First off, you should be spinning a 25p prop with that set up, or 24 4 blade. The fact that you can't even spin the same prop as the 330hp shows that somethign is wrong. The weight of the engines is so close that it is a non issue. I would tach the engine directly with something reliable to verify.
Was the 502EFI new or fresh?
If it was used did you perform compression and leak down tests before the install?
BUT before I rebuilt the engine I would check a few things
Fuel Pressure, was the 454 EFi? I thought the EFI 454's were 310HP, and 385?
Electrical, check all wiring to make sure you are getting full spark, advance etc.
It only takes fuel and fire to make power, if the engine is healthy, it is one of thise 2 things, otherwise the engine may not be tired.
06-09-2011, 02:05 PM
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ok i just went a ran the boat in the driveway. I noticed gas was dribbleing out of the over flow hose down into the mechanical fuel pump. so I pulled the cover off of the fuel cooler, and under the cover there was the rubber diaphram piece that had a whole in it, so it was allowing fuel to dump out. where there overflow hose comes out. Do ya think that may have been the prob?
