crossover system basics

[cutwater]

I'm going to go to a crossover system this season, let me know if I am overlooking anything... SBC.

- When I remove the circ pump, do I need to buy a cover without the pump hole? Is this necessary?

- Where is the best place to relocate the temperature sender unit?

- If I add the inline pressure relief valve fitting from Hardin Marine, where is the best place to locate it? Immediately before the crossover bar? Also, I thought about using a fuel pressure sender right at the crossover to monitor the water pressure. Necessary or overkill?

[Lenny]

Looking forward to your replies as I am in the "same" :rolleyes: ...boat ...

[mjw930]

These parts should work for you.

http://www.cpperformance.com/detail.aspx?ID=2893

http://www.cpperformance.com/images/520-SM34.JPG

http://www.cpperformance.com/products/Cooling_System/thermostat-housings.htm (near bottom)

http://www.cpperformance.com/images/500-0680.jpg

This will accept your temp senders (gauge and alarm).

Your pressure relief would go between the sea water pump and the crossover.

[Barry Eller]

I'm going to go to a crossover system this season, let me know if I am overlooking anything... SBC.
- When I remove the circ pump, do I need to buy a cover without the pump hole? Is this necessary?
- Where is the best place to relocate the temperature sender unit?
- If I add the inline pressure relief valve fitting from Hardin Marine, where is the best place to locate it? Immediately before the crossover bar? Also, I thought about using a fuel pressure sender right at the crossover to monitor the water pressure. Necessary or overkill?
Are you talking about your timing chain cover? If you are, and it has a hole in it for a water pump, you will.
I left my temp sender in its original location.
I only have the by-pass hose from the crossover to the thermostat housing.

[cutwater]

I guess I mean the timing cover, wouldn't mine have a hole for the circ pump shaft? I've seen them both ways... maybe this is for a cam drive only? When I remove the circ pump, will I need to buy a timing cover w/o the pump shaft hole?

I could be way off here... :wink:

ALSO, my setup is OMC with the LOW STARBOARD raw water entry (pump is in the drive). The Stainless Marine crossover bar is for port entry... Are the SBC water inlet holes symmetric? Basically I'm asking if I can turn the crossover bar upside down to make it starboard entry and it will still line up with the inlets?

[mjw930]

I guess I mean the timing cover, wouldn't mine have a hole for the circ pump shaft? When I remove the circ pump, will I need to cover that hole or buy a timing cover w/o the pump shaft hole?

I could be way off here... :wink:

ALSO, my setup is OMC with the LOW STARBOARD raw water entry (pump is in the drive). The Stainless Marine crossover bar is for port entry... Are the SBC water inlet holes symmetric? Basically I'm asking if I can turn the crossover bar upside down to make it starboard entry and it will still line up with the inlets?

CP carries both starboard and port entry versions.

http://www.cpperformance.com/products/Cooling_System/crossovers-stainless.htm

I'm not sure about holes in the cover, I've never seen one but most of my time has been spent on BBC's.

[Barry Eller]

I guess I mean the timing cover, wouldn't mine have a hole for the circ pump shaft? I've seen them both ways... maybe this is for a cam drive only? When I remove the circ pump, will I need to buy a timing cover w/o the pump shaft hole?

I could be way off here... :wink:

ALSO, my setup is OMC with the LOW STARBOARD raw water entry (pump is in the drive). The Stainless Marine crossover bar is for port entry... Are the SBC water inlet holes symmetric? Basically I'm asking if I can turn the crossover bar upside down to make it starboard entry and it will still line up with the inlets?


The crossover will align with the block entry holes either way...but be sure you use a crossover with a bypass hose, with a thermostat housing with the bypass inlet. That will keep you from turning the crossover upside down. Buy a crossover that fits your application.

If your recirculating water pump was cam driven, you will need to replace the timing gear cover.

[BlownCrewCab]

If you can do a oil cooler then you can have the Lower STB Pump, back under the motor thru cooler, then Lower port entry crossover. You can flip one (crossover) if you need too, the only problem is you can't use Stock MerC hoses, no big deal. as long as your getting water everywhere and maintaining good 5-20 psi with good flow you can plumb it like/how you want. just pay attention to flow and check for hot spots....

[cutwater]

My particular setup is OMC, not Merc, and the oil cooler is set up to run starboard, pump is in the drive. That's why I'm having this problem. I would rather not move it if possible. I have thought about going to one of the crossover bars plumbed with two NPT connections, that way I could determine the "polarity".

http://www.hardin-marine.com/detail~ID~1582.aspx (http://www.hardin-marine.com/detail%7EID%7E1582.aspx)

It doesn't say whether it's for BBC or SBC, though. CORRECTION - cpperformance has this listed as for the BBC.

[mjw930]

You did catch both Poodle and my reply that the crossover comes in port or starboard orientation?

Just buy the one that matches your motor. I wouldn't get into re plumbing the entire system, that's way more work than you need to do.

[cutwater]

You did catch both Poodle and my reply that the crossover comes in port or starboard orientation?

Just buy the one that matches your motor. I wouldn't get into re plumbing the entire system, that's way more work than you need to do.

Yep, got it. Thanks guys for the replies. I'm looking around at my options. Barry - my pump was belt driven so I don't think I'll need to replace the timing cover. Thanks.

John

[VetteLT193]

Yep, got it. Thanks guys for the replies. I'm looking around at my options. Barry - my pump was belt driven so I don't think I'll need to replace the timing cover. Thanks.

John

Let me know how this works out for you. I've considered it as well, but it seems like the cost benefit isn't there so I'm curious to your outcome.

Your boat definitely needs the relief valve, it flows a TON more water than mine.

Check ebay for a gaffrig water pressure gauge. There are whole kits on there for cheap. This is the one I have, comes with all the hose and fittings needed. I'm installing mine so I can tell when pressure is low to prevent overheating.

http://cgi.ebay.com/ebaymotors/Gaffrig-Livorsi-Water-Pressure-Gauge-Kit-Marine-Boat_W0QQcmdZViewItemQQcategoryZ124104QQihZ018QQit emZ280204599504QQrdZ1QQsspagenameZWDVW

[cutwater]

Check ebay for a gaffrig water pressure gauge. There are whole kits on there for cheap. This is the one I have, comes with all the hose and fittings needed. I'm installing mine so I can tell when pressure is low to prevent overheating.

http://cgi.ebay.com/ebaymotors/Gaffrig-Livorsi-Water-Pressure-Gauge-Kit-Marine-Boat_W0QQcmdZViewItemQQcategoryZ124104QQihZ018QQit emZ280204599504QQrdZ1QQsspagenameZWDVW

Thanks Vette, I'll look in to that gauge. As far as cost-benefit, I'm also considering the fact that I should pick up several HP by dropping the circ pump. At least that's one way I'm justifying it :wink:

Question - has anyone ever used an electric fuel pressure sender to sense water pressure? Any reason why this wouldn't work?