Powerboat Forums at SpeedWake banner
1 - 18 of 18 Posts

·
Banned
Joined
·
70,398 Posts
Discussion Starter · #1 ·
I was told to remove my circulating pump and install a crossover. This would get a extra 15 hp (about) Does anyone know this to be true,and how many guys/gals are running crossovers? Any problems without the pump?
 

·
Registered
Joined
·
823 Posts
from what I have heard it frees up a little HP, 15 might be a little on the high side, and running a crossover will make your engine run cooler, because the water only flows through once, instead of
twice with a pump{up one side then down the other} anybody else with some input here? Mark
 

·
Registered
Joined
·
510 Posts
I run a crossover. Granted it's one less thing you're turning so you'd pickup some HP. Your engine will run cooler if you run it without a t-stat (that will net you a little HP) You've got less clutter and weight. ????? Net HP gained ???

I run in fairly cold water(WI) so I run mine with a restrictor instead of a t-stat. I can maintain 140* at idle and 175* after a full boost power run. Before with recirc. pump and t-stat I'd be over 200*.

My opinion yes they are nice and you probably grab a few extra horses. Cheap HP !!
 

·
Premium Member
Joined
·
27,558 Posts
of course this assumes you have a bravo drive and I'm sure you do.
The ahpha drive the the water pump built into it.

The bravo drive does not have a pump and relies on the water pump on the engine (the belt driven sea water pump). The water pump on your engine is not necessary because you already have a belt driven sea water pump. I installed a crossover on my 222 stinger and it is trick - it also eliminates the engine water pump.

A lot of guys run without thermostats but I don't. I have a 110 degree themostat and my engine (the blower motor in the stinger) never runs above 120 degrees. The are various schools of thought on running without a termostat. Some guys insist on it and other thinks that cold water shocks the engine too much. I adhere to the second school of thought. I'm just not crazy about running 60 degree water through an engine that likes to run at 150 and I've never seen my boat get above 120 even at idle for long periods.

I don't know if if will get you 15hp (that sounds like a lot), but it will no doubt add hp and reduce rotating mass which always adds up to HP.

I'll take some pics of the setup on my stinger over the weekend and post them here so you can see an actual setup.

- jeff
 

·
Banned
Joined
·
70,398 Posts
Discussion Starter · #5 ·
Hey guys. Just wanted to make sure I understand. I have a 7.4 Ltr carbed with Bravo I. Are you saying that I can replace the large circulating pump with a crossover. If so, do I still run the thermostat(160 degree). Thanks for all the valuable info.
Dan:p:
 

·
Premium Member
Joined
·
27,558 Posts
Yes, you can replace the water pump with a cross-over. The choice to run a thermostat is up to you. I WILL take pictures tomorrow morning with my digital camera and post them here of my setup. I'm pretty sure I left the hoses off the fittings when I winterized the boat, but the pics will show the setup very clearly.

If you take a look at your boat you'll probably find the fresh water pump on the lower left side of the engine looking at it from the front.

- jeff
 

·
Banned
Joined
·
70,398 Posts
Discussion Starter · #7 ·
I more question. After purchasing the crossover,wont I need something to block off where the pump used to be? Any suggestions on where to purchase the needed accessories at a DECENT price.? Oops I guess thats 2 questions.
 

·
Super Goon At Large
Joined
·
6,103 Posts
Hi Boatnut,


The crossover will bolt right up to where the old pump was, it has the falnges that mate up to it and has one hose off of it. I wish I had a picture of one to show you I have them on both of my motors. I also still run a Tstat. I have a 140 in it right now. Look at www.eddiemarine.com they have them, I got mine thru them. I know you can most likely find them cheaper someplace else but I know they have them and the are top notch as far as quality goes. Good Luck:D :D
 

·
Banned
Joined
·
70,398 Posts
Discussion Starter · #9 ·
FA18Driver,yea I am looking in CP performance and see what you are talking. As for the thermostat,I agree I am going to run one. The funny thing is I did not run one all last season,boat ran about a 100 degrees. Did not seem to have any problems,but I still think I will run one.


Thanks Paul


P.S the price seems to range from $130.00 -$260.00
The one for $260.00 does have the thermostat,and housing. All polished stainless
 

·
Premium Member
Joined
·
27,558 Posts
here's the cool engine the very cool cross over is attached to...
don't let the sunny day fool you - it was cold outside when I took thes pics this morning :)
:devious:
 

Attachments

·
Registered
Joined
·
95 Posts
Jeff,
Thats a pretty snappy looking setup. I think it would look good in that sunsation!!!!!!!!!
 

·
Premium Member
Joined
·
27,558 Posts
pretty snappy?
you should know - you rigged it...
It's honker - that's for sure. It's a great engine and ohhhhhhh does it sound so bad :devious:

yea...wouldn't it...
I just need to find a taker for the Stinger first.
One guys is interested and may come next w/e to look at it.
How you been?
Sorry I have not been in touch. I'm wiped out from too many 16 hour days...

like the weather on the forum?

:) jeff
 

·
Registered
Joined
·
95 Posts
Jeff,
Things are going real good. I too have been very busy. I have a couple new projects going on .I currently have a 41 stinger in the the shop I am rigging. When you get a chance you have to stop by my new shop.I also want to give you a pat on the back for a job well done on this site. All of your hard work has paid off and this site is awesome.Good luck!
Jim
 

·
Registered
Joined
·
136 Posts
is a crossover something i could use on my EFI motor(99 7.f efi mag 385hp) i am sure i would need to keep my stat in order for the ECM to work correctly. also what changes have to be done to the serpentine belt? its not like the circulation pump does much if the seawater pump looses an impeller is it?
 

·
Banned
Joined
·
70,398 Posts
Discussion Starter · #17 ·
Mxz800! I think crossovers are best for blower motors that need to run cooler. If the motor is pretty close to stock I stick with the circulating pump setup. And stock t-stat housing. It does a great job of keeping temps constant so you don't build too much moisture in the motor. And in my opinion, won't free up any noticable Hp.

Eric
 

·
Premium Member
Joined
·
8,666 Posts
they never listen Checkmate,,, :D :D :D
 
1 - 18 of 18 Posts
Top