13 replies to this topic

[Painterman]

 image.jpg   209.74K   4 downloads hi guys the two pipes either side are they left as they are or should they have hoses on if so were do they go? Iv seen some pics with hoses on but it did not show we're they go to if that makes sense
Cheers

[KernowCooper]

there for a hot water supply from the heater pipes, in one side out the other, to aid cold running/warm up but some dont bother and just leave them blank

[Gremlin]

You can connct them to the heater pipes to heat the air going into the engine but most leave them disconnected including me, to get the best performance the air going into the engine should be as cold as possible

[Painterman]

K guys thanks for that now i know. Il leave em off

[monkey]

I think there may be a school of thought that says by having it plumbed it it stabilises the intake temps so the intake temps are more constant therefore you can tune the engine to give optimum performance all the time.

I may be talking utter crap though lol :-/

[Icey]

You can connct them to the heater pipes to heat the air going into the engine but most leave them disconnected including me, to get the best performance the air going into the engine should be as cold as possible

 

There is more to it than just temperature. It's mentioned in the Vizards books and for a road car they can help performance by improving fuel atomisation.

I'll be plumbing it in on mine. It also helps keep the heater pipe routing tidy

[Captain Mainwaring]

I think there may be a school of thought that says by having it plumbed it it stabilises the intake temps so the intake temps are more constant therefore you can tune the engine to give optimum performance all the time.

I may be talking utter crap though lol :-/

 

Do the maths on how long the charge is present in the manifold and see how much temperature rise you think you may get. In some circumstances a heated manifold may help prevent icing.

 

Engines love a cold intake charge by the way.

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If anyone does want to fit this setup, you'll find it impossible to get a factory hose from the Heater take-off (part # 12G2534 - normally on the front of the block by the clutch-side front corner of the tappet cover) to the pipe that is close to the threaded hole on the inlet/intake manifold.

 

The hose to the opposite side is super easy to find: just order the "combo-hose" http://minispares.co...gs/GRH1159.aspx and then one of the small ID hoses hanging off of that will connect to the pipe on the inlet/intake manifold that is close to the vacuum fitting on the other side (while the other small ID hose on that combo-hose connects to your heater core valve for warming the cockpit).

 

So what to do about the Heater take-off to Intake hose?

 

Some may recommend running some straight 5/8" hose but there are too many sharp right angles between some very short runs to bend straight hose without kinking...

 

So after several hours of pouring over the Gates small ID molded hose catalog images, I bought a part number "19132" molded hose.

 

It's simple to fit:

 

1. Lay it in, keeping the front close to the Heater Takeoff and overlapping the inlet/intake pipe

2. Mark and cut to fit the side to the inlet/intake pipe first (about 4-5" off that end)

3. Slip your two clamps onto the hose, positioning the screws so they are easy to get at

4. Then dry fit the rear and find that you'll need to trim just 3/4" off the front (to sit below the Cooper cold air intake tube if you have one like me)

5. Then with a very gentle twist of the front (to make it vertical), it will fit onto the takeoff very snugly

 

It is effectively a "factory fit" hose once cut to fit.

 

And where a 5/8" hose is 0.625 and is therefore loose at the intake side since it is just a 1/2" pipe, this Gates hose #19132 is 0.6" ID and makes a good snug fit on either side.

 

For forum search purposes I'll call it: "Gates 19132 molded hose for heater take off to HIF44 heated intake manifold".

 

See pics attached

Attached Files

•  Gates-19132-heater-TO-to-intake.jpg   78.74K   4 downloads

[Rorf]

I would imagine this needs to be connected where temperatures get down to below zero deg C

 

But most of us only drive them in hot sunny weather

[Ethel]

It's not so much heating air. Boyle's Law tells us if we reduce the pressure (as happens when the throttle isn't wide open) then you also reduce the temperature. That makes it easier for fuel to condense on your manifold and mess up the air fuel ratio. Putting heat in to the manifold moves the point that happens further out of your engine's operating range. That the air doesn't have long enough to heat up is a plus as ideally you want all the fuel to get in to the cylinders in liquid form, leaving more room for air.

[MarxnJaxCooper]

 72CEBA53-A562-4771-AC25-3004C16D31F9.jpeg   76.31K   2 downloadsOn this same manifold, does anyone know where this vent tube goes too? Was it to the original OEM air cleaner?

I’m running a K&N cone on my SU so wondering if I leave the tube open or can remove it and plug the brass tube on the intake manifold

[panky]

It should be blanked off if not in use as it will draw air in and mess with the mixture. I think it originally went to the air cleaner to operate the cold/warm air diverter valve.

Edited by panky, 11 April 2022 - 10:33 AM.

[MarxnJaxCooper]

Thanks , that’s what I thought but wanted to check before I plugged it.

much appreciated

Mark

[croc7]

I ran a hose from the rad hose to the manifold, then connected the heater outlet to the manifold. Made the engine compartment much more tidy with no effect on power. No regrets-car runs great.