cmi headers
#1
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cmi headers
my buddy has a 27 awesome cat we just put his new engine in and the water jacketed tails on his CMI stainless headers dont have enough drop to fit the transom cut outs for the exhaust. they are about an inch and a half to high.
the questions are:
1) do the tails have to be water jacketed or can i make my own stainless tails and run em dry with the water going over board from the header outlet? or if i make my own tails do i need to weld in a bung for water to enter them?
2) where and how much should he expect to pay for a set of tails that will fit his application. also how do you measure and make sure you get the right ones when he does find some or decide to buy new ones?
the questions are:
1) do the tails have to be water jacketed or can i make my own stainless tails and run em dry with the water going over board from the header outlet? or if i make my own tails do i need to weld in a bung for water to enter them?
2) where and how much should he expect to pay for a set of tails that will fit his application. also how do you measure and make sure you get the right ones when he does find some or decide to buy new ones?
#4
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Thread Starter
i was sure there had to be some kind of hazard running them totally dry.
Question: what about injecting the water into a stainless tail?? hence a water injected tail rather than a water jacketed tail????
i know water injected headers stay really cool and dont have much problems.......
thanks for the info guys!
#6
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If you need new tail pipes you can mock it up with pvc pipe and then send that to cmi and they will make the new pipe exactly the way it needs to be. Just and idea
#8
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forgive my questioning, but if all tails must be water jacketed then whats the difference in the the stock exhaust that Mercruiser uses, in most cases either a straight stainless pipe clamped on both ends by rubber boots or simply a rubber hose, that goes from the manifold riser where the water is injected to the exhaust tips at the transom. hence a "water injsected" wet tail pipe and not a water jacketed tail pipe.
just wondering......im gnna do what is right...but at the same time i understand that there is often more than one way to skin a cat and still be safe and functional at the same time.
reversion wont be a problem.....so why couldnt i run "wet" tails with the water being injected into the tial pipe at the joint where they meet the riser......just like stock merc stuff???
the point being that i have the material and can make my own tails for almost no money if this idea will work.
Last edited by 2tonchevy; 01-23-2012 at 12:14 PM.
#9
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Merc stock exhaust dumps it at top of the 90 in the riser so tail or rubber boot is cool. Cmi runs a jumper and dumps at end of tail, but the water runs in the whole tail so it keeps it cool. No real way around this. Many have tried to think or try a way around it and char grilled their transoms. You can bend the cmi tails to a point.
#10
Charter Member # 55
Charter Member
ok.
forgive my questioning, but if all tails must be water jacketed then whats the difference in the the stock exhaust that Mercruiser uses, in most cases either a straight stainless pipe clamped on both ends by rubber boots or simply a rubber hose, that goes from the manifold riser where the water is injected to the exhaust tips at the transom. hence a "water injsected" wet tail pipe and not a water jacketed tail pipe.
just wondering......im gnna do what is right...but at the same time i understand that there is often more than one way to skin a cat and still be safe and functional at the same time.
reversion wont be a problem.....so why couldnt i run "wet" tails with the water being injected into the tial pipe at the joint where they meet the riser......just like stock merc stuff???
the point being that i have the material and can make my own tails for almost no money if this idea will work.
forgive my questioning, but if all tails must be water jacketed then whats the difference in the the stock exhaust that Mercruiser uses, in most cases either a straight stainless pipe clamped on both ends by rubber boots or simply a rubber hose, that goes from the manifold riser where the water is injected to the exhaust tips at the transom. hence a "water injsected" wet tail pipe and not a water jacketed tail pipe.
just wondering......im gnna do what is right...but at the same time i understand that there is often more than one way to skin a cat and still be safe and functional at the same time.
reversion wont be a problem.....so why couldnt i run "wet" tails with the water being injected into the tial pipe at the joint where they meet the riser......just like stock merc stuff???
the point being that i have the material and can make my own tails for almost no money if this idea will work.
Also, that is not "water injected" per se. That is just wet exhaust. Water injected is like what is used on jet boats.