I am thinking about installing crossovers on HP 525's EFI's to try and gain some HP by removing the standard circulating pump.Does anyone know if the 525 sea pumps will work all right without the circulating pumps or will a different sea pump be required. Also, what type of HP gains can be expected by doing away with the circulating pump. Any assistance from someone who has experience in this area would certainly be appreciated.

I have had bad experience trying to run crossovers on non-blower motors. Major P.I.A. trying to dial in temps and water pressures. Multiple threads on this subject here in the past. My advice ... save your money and your motors. Don't waste your time ... it is not worth a few un-noticeable H.P.

[QUOTE=VIPER7. Also, what type of HP gains can be expected by doing away with the circulating pump.[/QUOTE]

I agree. None that you will ever see w/o putting the motor on a dyno. And then very little.

Maybe 12 To 15hp !!!!!!!

Have to agree I would spend my time and money somewhere else on a N/A engine! Way too many issues with heat and pressure with no noticeable gains.

I agree with everyone that there are much better places to look for power on an NA engine but if your determined to do it, Rex marine out of California has a poppet valve kit that actualy works and runs her at 160-170. I had to install one on a customers boat that came with a marine power engine with a crossover and the boat builder didn't leave any room in front of the engine for a circ pump. It had condensation problems becuase it was never getting over 80 degrees. I was suprised at how well the poppet valve sytem worked right out of the box.

525EFI's have closed cooling. You cant remove the water circulating pump. It is what is circulating the coolant.

Duh I don't know what the hell I was thinking

I totally forgot closed cooling. Must be one of those senior moments. Thanks for the correction

Appearantly the same thing I was.