Reason behind manifold coolant passages?
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Hunting Skylines
Joined: Apr 2001
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From: Brisbane, Queensland, Australia.
Reason behind manifold coolant passages?
Anyone know exactly why the passages are there on the stock manifold? Obviously it's done to warm the manifold but why? Better fuel atomisation?
Are you referring to the coolant passage through the throttlebody? The coolant hoses on the tb go to the thermo wax pellet which keeps the idle high when the engine is cold. I forget why it actually flows through the tb. The only other coolant passages I know of are on the turbo cars lower manifolds. These are just passages to the turbos. Only thing I can think of.
Last edited by rotarygod; Sep 5, 2002 at 05:14 PM.
Joined: Oct 2001
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From: Fort Branch, Indiana
No the reason coolant goes through the inatke manifold is cause of the proximity of the exhasut manifold. The coolant is a HELL of a lot cooler than the exhaust manifolds tmep, and it keeps the exhaust manifold from cooking the fuel before it gets through the intake manifold.
Old [Sch|F]ool
Joined: May 2001
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From: Cleveland, Ohio, USA
Originally posted by MIKE-P-28
No the reason coolant goes through the inatke manifold is cause of the proximity of the exhasut manifold. The coolant is a HELL of a lot cooler than the exhaust manifolds tmep, and it keeps the exhaust manifold from cooking the fuel before it gets through the intake manifold.
No the reason coolant goes through the inatke manifold is cause of the proximity of the exhasut manifold. The coolant is a HELL of a lot cooler than the exhaust manifolds tmep, and it keeps the exhaust manifold from cooking the fuel before it gets through the intake manifold.
In fact, many engines USE the exhaust manifold to warm the intake up, instead of coolant.
Nikki-Modder Rex-Rodder
Joined: Feb 2001
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From: Trying to convince some clown not to put a Holley 600 on his 12a.
I always thought it was just to keep the mixture at a consistant temperature. The other thought was simply to keep the carb from icing.
On the other hand, there is'nt much meat on that side of the engine for water passages. again...(?) However, I've read many times of people blocking those passages off.
...Ahhh WTF- I dunno!
On the other hand, there is'nt much meat on that side of the engine for water passages. again...(?) However, I've read many times of people blocking those passages off.
...Ahhh WTF- I dunno!
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yeah ... i blocked them once, thinking that i would keep the air cooler and get more power!
A . not thinking about the fact that, yes, the exhaust is right there
B . not thinking that the fuel and air have already been mixed by the time they get in the manifold
so what have we learned children? the diabolical one doesn't think!
young and dumb, i guess 
A . not thinking about the fact that, yes, the exhaust is right there
B . not thinking that the fuel and air have already been mixed by the time they get in the manifold
so what have we learned children? the diabolical one doesn't think!
young and dumb, i guess
Wassup!!
Joined: Jul 2001
Posts: 1,081
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From: Longmont Co.
Speaking of intakes, how much is a lower intake for a 6 port 13B worth? The reason i ask is because i need to replace mine because the casting is stripped where one of the steel bolts goes in causing a vacumn leak. On a side note, you think i could fix it with one of those helicoil kits?
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