HIF44 Inlet manifold - None Heated vs Heated

[Oddball67]

I have a heated inlet manifold and was thinking about fitting a none heated inlet manifold but, not sure what vehicle had them fitted. Can any one advise?

I'm sure there's many Pro/cons for and against a heated vs a none heated manifold.

[bmcecosse]

You simply don't connect the water heat pipes...... In theory, the colder the air/fuel gas mix going into the engine, the more dense it will be, and therefore potentially the more power will be produced - hence use of 'intercoolers' on blown engines. Most twin carb inlets for the A series have no heating - there's a good reason! But - it is just arguable that in winter - fuel can 'pool' in the inlet manifold at low flow rates, and so it's possible that heating the manifold will help to evaporate that fuel - and may lead to better economy/emissions around town. It will NOT prevent carb icing - a common myth!!

[Stig]

If it's plumbed into the return feed from the heater, as mine is, then when you're not using the heater in summer it won't get heated. "Simples!"

[bmcecosse]

You obviously live in a warmer climate than I do Stig....... not use heater in summer - that's a laugh!

[Alex'n'Ane]

I sometimes have to use the heater element in summer if stuck in traffic as it acts as an extra radiator to assist engine cooling.