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Old 01-24-2006, 06:12 PM   #1
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Exclamation coolant passage bypass

has anyone ever bypassed the coolant lines that run into the intake (to warm the air i would suppose). just seems like that would leave the air running into the engine much cooler. ive heard of doing this on stangs just never heard of it talked about here. any input would be great.
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Old 01-24-2006, 06:32 PM   #2
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You can do that trick with most cars. I did it with my Honda, but left it alone on my Supra. Just find the inlet and outlet and tie them together with the appropriate male/male fitting or a really long hose, then cap off the open passages. On a boosted car it will probably make little difference, hell even on an NA car it probably makes little difference, but every little bit helps.
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Old 01-24-2006, 07:22 PM   #3
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just what i needed to know. im in the middle of changing the hg so im trying to do a few small things to get what i can out of it. having the head ported, polished, and milled. electric cooling fan, underdrive pulleys. any other small mods u know about? like u said every bit counts.
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Old 01-24-2006, 10:43 PM   #4
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If your head is being ported & polished, just polish the exhaust side. You want the intake side rough to create turbulance for better fuel atomization.
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Old 01-24-2006, 11:59 PM   #5
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Smile I may do it too

Have the machine shop do a '3 cut' on the valves when they do the valve job. This will give it better air flow into/out of the cylinders.

Actually porting (matching the head to the manifold mating surfaces), and polishing (grinding the inside to a smooth finish) the intake will allow quicker, smoother airflow into cylinders. Drag racers have been doing this for ever, with excellent results.

Also...I was waiting for someone to ask about eliminating the hot coolant being passed through the throttlebody. I was thinking about this too. The MAIN reason it is there...to warm up the air sooner for emmisions control, and better engine running during cold operation.
All engines have some form of this. Old V8s ran exhaust through the intake manifold under the carburetor. The main reason was that the fuel AND air ran through the manifold, so it needed to be warmed up to mix it together.

Ported fuel injection (supra) only runs air through the manifold, so I was thinking about by-passing the coolant at TB, too. But it is very cold all winter here, so I'll wait till summer to try it.

Also, coolant runs through the ISC valve (idle speed control), too.

My thought also is that I would do as mentioned above on connections, because if you cap off the hose connections at the block (to eliminate the hoses), you might cause a problem with coolant flow. In other words, the 'flow' may be needed to help other places in the engine stay cool.
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