31 replies to this topic

[Cooperman]

the heated inlet is to stop the fuel from "sticking" to the insides of the inlet manifold if you get what i mean

Whoever told you that is really talking rubbish .
It heated manifolds are so ideal, how did the original Cooper & Cooper 'S', the MGB, Escort Twin Cam, Healey 3000, etc, etc, go so well as none of them had heated inlet manifolds and I'm sure the atomised fuel mixture didn't 'stick' to the manifold walls.

[Ethel]

They were all twin carbed models with a shorter, straighter path into the hot cylinder head, and from an era when economy and emissions mattered less. Air's a poor conductor, a hot manifold wont pass on much heat to air that doesn't touch it while rushing through the middle.

[wbutcheruk2]

Just a question, but does it help with carb icing at all?

[jaydee]

Just a question, but does it help with carb icing at all?

Not at all, but it could give a nice placebo effect.

[finch661]

Going on the basis that it might be ok to plumb in the manifold, whats the best way to do it?

[wbutcheruk2]

I'm currently plumbing in the heater as the person before took it out! Which is the in and which is the out? or does it matter? As looking from inside the car the two pipes connect to the right hand side (Drivers foot well side).

[Ethel]

It won't really matter, where you can arrange the flow (from the head to the bottom hose) to go uphill to help clear trapped air.

[rally515]

Just to add my 2p's worth the freezing point of the fuel (petrol) is -60*C which even than it isnt truly frozen so the whole freezing problem (if any) will be to do with the carb.

[jaydee]

Carb icing has more to do with damp air icing in the venturi where temps are close to zero deg. (if not less)

[rally515]

Well then theres the problem,why not create a coil heated dashpot

[robminibcy]

if i remember rightly canadian spec cars did have some sort if carb heater

[mike.]

I've tried mine with it plumbed in and without and find it runs nicer overall with it connected up, so I have mine like that all year round.

I have a valve on my heater pipes so I can turn the heater and the manifold flow off during hot weather but the rest of the time I leave the water flowing through it.

[Jamie_RoverMini35]

we were told at college very recently about carb icing and the purpose of the water heated manifold . carb icing is if the cars going a certain speed for a long time, say on the motorway particles of water entering the carb will begin to stick to the insides and begin to freeze potentially jamming the throttle

[SolarB]

carb icing is if the cars going a certain speed for a long time, say on the motorway particles of water entering the carb will begin to stick to the insides and begin to freeze potentially jamming the throttle

Suffered from that once on a fire breathing 1380 with a Webber. Accelerated down a dual carriageway only to find that when I took my foot off the throttle the car kept accelerating. An interesting few seconds.

[jakejakejake1]

I have suffered from carb icing over the last few weeks, 3 times on country lanes after being on the motorway, and once on the motorway, not fun being stuck at full throttle! (I lie, it was fun, for a moment anyway haha).

The thing is icing happens in the carb, not the manifold, so the water heated manifold doesn't help too much in this respect.