Thermostat Question...

I learned this trick from the jet boat guys 25 years ago. If you route your raw water through your exhaust manifolds first, then into your engine, you pre-warm it. Then all you do is put a drilled thermostat in and you have a bulletproof cooling system that never runs cold. On this setup, the engine outlet water runs to your exhaust tails.

I like that idea. Could you route it like this (1) bottom of one manifold traveling to the top (2) jump across the motor to the top of the other manifold traveling down (3) enter the engine via crossover (4) finally exiting thermo housing with a feed to each tailpipe. What do you think?
 
Probably not enough flow for anything with big horsepower. Under 400 hp, most likely no problem. You're still going to have to tee it somewhere to put water into the engine. Why not do it before the manifolds?
 
I was thinking you go straight from the water pickup, to the raw water pump, through one manifold, jump to the other manifold, then into the crossover and finally out the tailpipes via thermo housing. Basically a single line from the water pickup to the engine and only splitting at the thermo housing to go to each tailpipe. Or maybe I'm just thinking to much again....:ack2:
 
I'm concerned that you're not going to move enough cooling water through one 3/4" hose to cool the engines at max power output. Especially now that you're double-preheating the water through two manifolds. If it got hot enough, you'd be pumping steam into the block, not water.

If you split the lines after your oil cooler, then run in series to each manifold, then to the front of the block, you eliminate the crossover. They split at the water neck on the manifold.
 
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