cross over or circ pump
 

pros and cons to water cross over vs stock circulating pump

I use the EMI crossover with thermostat and bypass. I like it and have not problems. I also have a large oil/ps cooler that pre heats the water. The temps are very stable.

I run one with a by pass and therm, works great...had one with no by pass and no therm ran to cold..Rob

how does the water ciculate without a waterpump? is there used an electric pump?

chris

circulating pump
 

if you are using a bravo drive then the water is comming from the sea-water pump.you pick up h/p by not running the circulating pump.as said by others,run a t-stait .i think the h/p gain is around 5-10.hope this helps.

if i understand correct, the crossover works only at raw water cooling systems, no closed coolings.

thats is correct

Say what you will, Mercury Racing has some very durable racing motors. This one (and many other models) have a recirculating water pump. You decide which is best for you.
http://www.mercuryracing.com/sterndrives/hp525efi.php

I had a 468 putting out about 500 hp with a cross over and bypass and ran it for 5 years with out issue. Unfortunately it threw a fan belt and because i did not have a warning horn and wasn't paying attention to the guages I cooked it. Same thing would have happened with the water pump though.

so which one will run cooler,, cross over w/ t stat and bypass or circ pump w/ t stat

Cool?
 

Heat is your friend, heat is power. Heat makes nice idle quality. In a N/A engine you want heat. With saltwater raw water cooled you cannot have much heat without issues. A circ pump will help with heat distribution. Once yu go Fresh Water Cooled it is hard to go back.
Steve

I've never run a cross over so no 1st hand experience. But I would think you could get temps too cool/cold with either type.

I've half azzed looked into going with a cross over but have stayed with the circ. pump because it's dependable. On the other hand, allot of time there seems to be a bunch of screwing around to get the cross over/temps/water pressure the way it's supposed to be. Cross over is fine if you want to "clean up" the appearance of the front of the engine. Or want to get that last 5-7 hp (only what I've read). Personally I'm not into the bling enough to change over. And I have plenty of hp :evilb: so I wouldn't even realize another 5-7.

Where can i get the cross over kit with bypass.

cross-over
 

stainless marine or cpperformance.i like stainless marine myself.