[Tigers] Intake coolant

[Allan Ballard]

I believe stock engines also routed coolant through a base plate beneath the carburetor.

-Allan Ballard
Mk1a
Series I Alpine

Sent from my iPhone

> On Mar 1, 2017, at 6:52 PM, Tom Witt via Tigers <tigers at autox.team.net> wrote:
> 
> There are water crossover passages at the front and rear of many small block Ford factory intakes. There are generally two coolant connection points on the front passage. One is for the coolant temperature sender. The other feeds through the heater circuit.  Assuming the day is hot and the heater wouldn't be activated there is no circulation of coolant to the heater. So there is no difference between the hose hooked properly with the heater valve closed, or it being blocked off.  IF (a big if) one was willing to turn on the heater on a hot day there is the OPTION of getting additional cooling through the heater. But it is just that, an unpleasant option. I’m assuming your manifold does not lack a rear crossover. Some manifold designs eliminate the rear crossover passage. Here is one of the debates on the issue. I’m sure you can find more. http://mmb.maverick.to/threads/rear-intake-flow-topic-from-franks-build-thread.79331/  There is a possibility that someone added fittings at the rear of an aftermarket (non-rear crossover) manifold and a bridging hose is not present on yours???
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> From: CoolVT at aol.com
> Sent: Wednesday, March 01, 2017 12:32 PM
> To: atwittsend at verizon.net
> Subject: Re: [Tigers] Intake coolant
>  
> I do indeed have an "air gap" on the Tiger. I was asking the question because of another SBF vehicle that I recently purchased in Florida.  The coolant hose going into the manifold has been cut and plugged. My local guy said it was necessary for cooling. I'm betting the underhood temps of cars down here can get to 250 degrees so maybe it would help in cooling for a southern vehicle.
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> Mark L
>  
> In a message dated 3/1/2017 12:05:39 P.M. Eastern Standard Time, atwittsend at verizon.net writes:
> Yes, in day to day driving the heated intake manifold helps to keep fuel droplets in a vapor state. Obviously in colder weather this is even more practical. This can both increase mileage and improve emissions.  However, it would seem to not help keep the intake cooler (as in the mentioned south) unless the ambient outside air temperature was over 180+ degrees! Some engines simply use the intake manifold as a “crossover” passage between the cylinder heads for coolant flow to balance the heat in the engine.  A lot of engines also run exhaust gases under the center of the intake (under the carburetor) for the same purpose. These are basic statements about a engines in general regarding a heated intake manifold and not the small block Ford in particular.
>  
>   Your intake manifold is likely an “air gap” style.  While a heated intake is practical for reasons stated above..., it is not the best design for outright performance. A cooler intake condenses the air and puts more of it into the engine, thus increasing performance. The air gap design isolates the intake runners from any coolant, exhaust cross over gasses and even the heat from oil under the intake manifold in most “V” style engines.  If you are noticing no difference be thankful. You have likely gained some performance advantage without suffering the corresponding problems that can potential arise.
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> From: CoolVT--- via Tigers
> Sent: Wednesday, March 01, 2017 6:33 AM
> To: tigers at autox.team.net
> Subject: [Tigers] Intake coolant
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> Coolant is run through the stock intake. What is the purpose of the coolant running through? Thought I had heard that it was to help warm the intake in cooler weather.  Down south I am hearing it's to help cool the intake. So, what is the exact purpose?  I have an aftermarket intake on the Tiger with no coolant passages and don't see any difference.
>  
> Mark L
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