35 replies to this topic

[MrJenkinsEsq]

http://www.theminifo...inlet-manifold/

A good thread on the water heated debate. My first engine had it plumbed in, and the first time I took it to be tuned on the rolling road at MiniSport, the operator told me to bypass it, so I bowed to his greater knowledge and suppose I've never really questioned it since.

[neal]

 

Too much heat in the inlet tract robs power and too cold causes icing

You are quite correct but the water heated manifolds don't introduce too much heat. Vizard notes that for most engines the loss of power will be a near imperceptible 1hp. It's a worthy sacrifice for the improvements it provides in other areas.

 

It's a little tangential to the point but it's notable on engines with longer intake tracts (my LandRover is a good example) that heated manifolds provide much better economy figures because the improvement in atomisation counters the reduced charge density. The same problem is evident for fuel injection - wall wetting (X-Tau).

 

What I'm really getting at is that it's not always clear cut that hot intake == bad - like any analogue system, it's a balancing act.

 

Your absolutely right, that's why I wrote 'Too much heat in the inlet tract robs power and too cold causes icing' I didn't bother to comment on the grey area in between too hot and too cold due to the lengthy post and I do like to leave a bit of meat on the bone for others to have a chew on, (keeps the thread/topic on the boil) I think we're all versed on Vizard's book and if some are not then It maybe a good time to plug the book.

 

Plenty of bedtime reading there, don't you agree??

Edited by neal, 29 October 2016 - 05:28 PM.

[Spider]

http://www.theminifo...inlet-manifold/

A good thread on the water heated debate. My first engine had it plumbed in, and the first time I took it to be tuned on the rolling road at MiniSport, the operator told me to bypass it, so I bowed to his greater knowledge and suppose I've never really questioned it since.

 

For out and out Horsepower, yes, but for a street car, I'd leave it connected.

 

It will give improved fuel usage and smoother idle / low speed running when connected.

[Dusky]

You're All tempting me to connect Mine now
Do you still go to the heater matrix?

[Spider]

Do you still go to the heater matrix?

 

It can make for a tidier hose layout if you are connecting in the heater (and who wouldn't want that?).

[neal]

http://www.theminifo...inlet-manifold/

A good thread on the water heated debate. My first engine had it plumbed in, and the first time I took it to be tuned on the rolling road at MiniSport, the operator told me to bypass it, so I bowed to his greater knowledge and suppose I've never really questioned it since.

 
For out and out Horsepower, yes, but for a street car, I'd leave it connected.
 
It will give improved fuel usage and smoother idle / low speed running when connected.

Good point, but who wants to be at idle? I want to be in the happy gear (3rd) going through those little lanes and to be fair fuel mileage is going to be the last thing on my mind.

Drive it man....... and forget about the petrol penny pinchers!!
(Although, if you are worried about fuel mileage, go on and buy a modern 'plastic fantastic' hybrid)

Edited by neal, 30 October 2016 - 04:50 AM.