Exhaust Explanation

quote:
Originally posted by Capt. Bill1

What if you just put a restriction in the water line to force more water to the hot side? Did the cooler side temp go up at all when you did the pinch test?

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Tomorrow, we are going out on the boat for the day. Will see how the temp issue goes. I have a hose clamp I will put on the cool side if I have to, to restrict just a bit.

Restricting it on the cooler side just a bit had no discernible temp difference to the cool side, but did have a significant impact on the hot side.

--Rick
 
Is the temps on the hot riser the same, top and bottom?

I say that cuz I've been doing quite a bit of 'experimenting' making my SS exhaust system. I've found out that too much unrestricted out-flow in the riser section of the exhaust will not allow the cavity at the top of the riser to fill with water. There actually has to be restriction during idle speeds to let water to 'back-up'. It's just a different way of 'pinching' the supply hose.
 
Rick,
If you found that restricting the cool side improved the hot side, I'd say that you've got a situation that Charlie describes. The water exits so fast it doesn't fill the riser to the top. There are two different riser gaskets for Mercruisers. The full flow and the restricted flow, if you've got the full flow your problem could be solved by switching to the restricted flow gaskets.
Rob
 
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