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-   -   Rear Crossover on intake manifold (https://www.offshoreonly.com/forums/general-q/171658-rear-crossover-intake-manifold.html)

getrdunn 02-04-2010 05:52 PM

are guys still doing this? also is it imperative to do it on both sides of the intake? i may do this on my 496's and have a t fitting on one side or the other with a pressure relief valve. seems sensable.

Young Performance 02-04-2010 09:54 PM

I always do it. However, I dump the lines overboard. I not only use it to eliminate any steam pockets at the rear of the heads and intake, but I also use it to control water pressure. I will start out with a #4 coming out of each side. They run to a tee and dump overboard. If I need to get rid of more water, then I will up the hoses to #6. My dump hose is a #10, so I can go up to (2) #8 hoses from the rear of the intake to control water pres.
I do not run a check valve on it because I want it to flow water all the time. You could run hoses to the front of the engine, but then it will not work to help in controlling water pressure. That is always not nesseccary, but it is nice if you need it. You must run a hose from each side of the rear of the intake since there is no crossover to tie the 2 sides together.
Eddie

getrdunn 02-04-2010 10:15 PM


Originally Posted by Young Performance (Post 3039155)
I always do it. However, I dump the lines overboard. I not only use it to eliminate any steam pockets at the rear of the heads and intake, but I also use it to control water pressure. I will start out with a #4 coming out of each side. They run to a tee and dump overboard. If I need to get rid of more water, then I will up the hoses to #6. My dump hose is a #10, so I can go up to (2) #8 hoses from the rear of the intake to control water pres.
I do not run a check valve on it because I want it to flow water all the time. You could run hoses to the front of the engine, but then it will not work to help in controlling water pressure. That is always not nesseccary, but it is nice if you need it. You must run a hose from each side of the rear of the intake since there is no crossover to tie the 2 sides together.
Eddie

Thanks Eddie,
So if I understand you correctly don't really bother tieing into the front jackets. only rear. Makes good sense. Also like the idea of dumping if out and forgeting about the pressure valves. Those are known to NOT always work either. Also as long as were on the sub what is ideal pressure again?
Thanks
John

jeff1000man 02-04-2010 11:06 PM


Originally Posted by Young Performance (Post 3039155)
I always do it. However, I dump the lines overboard. I not only use it to eliminate any steam pockets at the rear of the heads and intake, but I also use it to control water pressure. I will start out with a #4 coming out of each side. They run to a tee and dump overboard. If I need to get rid of more water, then I will up the hoses to #6. My dump hose is a #10, so I can go up to (2) #8 hoses from the rear of the intake to control water pres.
I do not run a check valve on it because I want it to flow water all the time. You could run hoses to the front of the engine, but then it will not work to help in controlling water pressure. That is always not nesseccary, but it is nice if you need it. You must run a hose from each side of the rear of the intake since there is no crossover to tie the 2 sides together.
Eddie

Can I get away with drilling my intake after I have it installed?

Theoretically, It would just be minor metal shavings that would exit with the water, but ???????????????

Young Performance 02-05-2010 03:36 AM


Originally Posted by jeff1000man (Post 3039209)
Can I get away with drilling my intake after I have it installed?

Theoretically, It would just be minor metal shavings that would exit with the water, but ???????????????

Sure. No problem. The few little shavings won't hurt anything.

Noise Pollution 02-05-2010 05:11 AM

Eddie,

Will the lines from the back of the intake affect the cooling cooling of wet exhaust?
Thanks
Mike

fbc25el 02-05-2010 09:12 AM

Is there still a benfite to do this even if you have a circ. pump?

Panther 02-05-2010 09:57 AM

I'm running #6's to a "y" connector, then a single #6 overboard. Helped me lower water pressure a few lbs. and control the temps! :)

Also, I put the dumps on the side of the boat so I could peer overboard to confirm I'm pumping water at any given time. :)

Young Performance 02-05-2010 10:34 AM


Originally Posted by Noise Pollution (Post 3039259)
Eddie,

Will the lines from the back of the intake affect the cooling cooling of wet exhaust?
Thanks
Mike

The only way it would affect the cooling of the exhaust is if you have very low water pressure now.



Originally Posted by fbc25el (Post 3039391)
Is there still a benfite to do this even if you have a circ. pump?

Yes, it will still benefit you by not allowing steam pockets to form in the back of the engine.

Eddie

killfast1 03-15-2012 07:24 PM

Yes I know this is old, but going through reading stuff.

Would this still work if I ran the hoses to the back of my exhaust wherer I have another place I can remove the plug and put in another fitting?


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