Super Jet Opinions on this head

[Boz Mon]

I got this protec head and according to protec it should only have 2 water outs. The rear 2 are factory. Would I benefit from using one of the added ones instead of a factory one?

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[Quinc]

unless you are over heating I would leave the 2 new ones plugged. You want the cylinders/head to be around 130-140F

 

[Boz Mon]

Do I even need to use 2 water outs? I was running 1 on the stock head with no issues?

If I did run 2, where does the second one go? Directly to a pisser?


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[mikidymac]

The very generic rule of thumb is if you have dual cooling coming in then 2 outlets on the head.
Single cooling coming in then 1 outlet on the head.

 

[Boz Mon]

I have single cooling but it’s going in 2 holes on the manifold


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[Boz Mon]

I was gonna go with this method unless I can get away with using just one inlet.

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[vomitspot]

still single

 

[Req]

All the y fitting is doing is balancing the flow through the cylinders and making sure they both stay close to the same temperature. Water pressure going in is still the same since its getting its water from one feed still.

On the head I would do the exact opposite. Pick the two original NPT locations and have a y or tee fitting bring it back down to one, feed that to the pipe, out of the pipe to a tee, one leg of the tee goes overboard the other goes to the stinger of your b pipe, possibly with a flow control valve if you want.

If you have two outlets with only one feed you may end up with poor flow though the head and hot spots.

 

[Boz Mon]

So you’re saying use 2 on the head and bring those 2 into the headpipe?


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[Req]

Yes. Both go into a tee or y fitting and that single 3/8 feed goes to the headpipe. This will give you the balanced cooling that dual outlets provides without having issues of not enough pressure.

 

[Boz Mon]

Can I run 1 inlet on the factory pipe manifold? Front or back? I can’t figure out a way to make both work with a single line in


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[Req]

you can but its better to use both off a tee or y like you pictured. That way both cylinders get the same amount of water.

My opinion of course. Besides you would have to plug the second npt thread.

 

[Boz Mon]

Righto. That clears up everything. Thanks!


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[just joe]

I’d use a metal Y connector. The plastic will get brittle and may crack/leak. With a metal one, attach and forget.


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[joelake]

Second the above..... I have suffered the pain from using a plastic T once. It's just not worth it!