Circulating pump delete
 

Anyone remove the factory circulating pump & replace with a crossover on a 454/502 MPI merc motor?

Re: Circulating pump delete
 

depends on the brackets and belts/pullies your running
i had to run one unless i wanted to pony up some serious bucks to change everything
so what i did was to remove the impellor from it and seal it back up, they take about 30 hp to run,
i just run the merc sea pump

Re: Circulating pump delete
 

So you just pull the impeller right?

Re: Circulating pump delete
 

is it worth all the hassle on a stock motor set up for maybe 25-30hp?

Re: Circulating pump delete
 

This is a interesting topic to say the least. It has been discussed many times on the technical Forum. The first thing I found out is that 25to30 HP is a Extremely far stretch as far as HP gains. The second major problem people talk about is water pressure amd plumbing in water dumps and relief valves. I personally have put one on a 365 Magnum , carbed and noticed no gains other than cosmetic " Cleaned up the front of the engine" . When i started hearing about water pressure issues and blowing out intake gaskets and the like it scared me. I switched back to a circ. pump. I have seen many engines on this site with crossovers and it didn't appear tha they had water dumps or relief valves and they must run just fine . Ihave ask the question before about crossovers being just a direct bolt on as advertised and could never get a straight answer. If you need relief valves and water dumps with crossovers why dont the companies advertise them like that . Just my 2 cents

Re: Circulating pump delete
 

A huge can of worms for 5-7 hp.not 25-30

Re: Circulating pump delete
 

yes when people say 30 hp just look at the fractional hp belt that drives it and you realize it prob less then a few hp
I did mine and it looks good but no real performance in crease

Re: Circulating pump delete
 

For once I agree with Birdog :drink:


Not to mention you typed "just remove the impeller right?" Uhhm NO please do a search in the Tech section. You may want to enjoy your Turn-key boat and look elsewhere down the line for speed gains.
You may want to have your props worked on for a nice change without spending too much and having engine damage or hotspots.
Call one of the board prop sales/repair sponsors and work with them on custom work. I use Throttle-Up and have heard great things about B-Blades.

Re: Circulating pump delete
 

Props are done, drives are done. I just have a case of winter "what-ifIdidthisitus". I'm getting ready to rebuild the engines at the end of this 2006 season. So I need to gather ideas & parts early so my wife doesn't have a fit this next winter.

Re: Circulating pump delete
 

In that case......................I'm changing my mind..... :evilb: :drink:

Re: Circulating pump delete
 

I did it. It cleaned up the front of the engine and I fortunately have no water pressure issues. Engine temps are also very good w/ the 142 deg. stat.
My motivation was that the thermostat housing was ratty and deleting the pump got rid of one more thing to go wrong.

Speaking of which, I have two cir. pumps that are low hour I will give away just pay shipping...

Bryan

Re: Circulating pump delete
 

I'd be interested in one or both...mine started leaking this past fall....

Thanks,

Doug

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(262) 252-3377 Work
or
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Re: Circulating pump delete
 

What motors Bryanspeedracer ? How can some people have water pressure issues and some dont .

Re: Circulating pump delete
 

What motors Bryanspeedracer ? How can some people have water pressure issues and some dont .

Re: Circulating pump delete
 

I went with cam driven pumps, makes changing the impeller a snap and cleans evrything up...but it aint cheap mine, are not efi motors

Re: Circulating pump delete
 

Neat set up Water pressure peoblems ? water dumps? relief valves ?

Re: Circulating pump delete
 

I have the same...I think it's a slick set-up

Re: Circulating pump delete
 

Twin 468's. I have no idea why some people have problems and others don't.
Each motor has a large engine oil cooler and a smaller trans oil cooler, starboard side has p/s cooler. Both sides have sea strainers.
Maybe that info helps? I don't have enough experience with these set ups to guess accurately.

Bryan