Thermic Valve (air cleaner)

[stagwingnut]

Hi all , I don’t have my Thermic valve in the air cleaner connected due to using four branch exhaust manifolds . so no hot air induction pipe from near side exhaust manifold, I have the short pipe from the carbs which would usually go to the thermic valve blocked off with a screw , just wondering if this is detrimental in any way ? Regards Graham

[mallardstag]

I've been running it like that for years with no problems at all.
Simon

[singapore stag]

Most owners I know including myself don't have it connected
The thermic valve isn't needed in our climate, certainly not during the summer time. Supplying very hot air to the stroms isn't a good idea.

[mole42]

Supplying very hot air to the stroms isn't a good idea.

The thermic valve is designed to supply warmed air until the engine heats up, never hot air - it won't get very hot just because it rushes past the exhaust manifold! The valve switches the air supply to the forward cold air inlet at about 20ºC.

If it's all working correctly!

[singapore stag]

Most owners I know including myself don't have it connected
The thermic valve isn't needed in our climate, certainly not during the summer time. Supplying very hot air to the stroms isn't a good idea.

https://www.socforum.com/forum/forum/stag-owners-club/soc-forum/30794-thermic-valve-sensor-on-a-mk2

check wilf's post....https://www.socforum.com/forum/forum...lve#post516774

[stagwingnut]

All reassuring answers there thank you all Graham

[MikeParker]

It does make quite a difference to the warm up time in the winter. The Stag has a manifold with a very large "wet" area, which means, when cold, a big area for the petrol vapour to condense and collect. That petrol drips into the combustion chambers and does not get properly burnt. To overcome this loss of fuel, you have to use the choke to fire in more fuel. For this reason a Stag when warm will do 30 mpg, but when cold, more like 15. So fast warm up is important if you want to save money. It can also be prone to stalling with sudden opening of the throttle when cold for the same reason. So this fast warm-up device is important in my view.

[mike@thenook]

I still have the valve in the air cleaner but as I have the tubular manifolds I just have the duct pipe resting near the pipes where normally there would be the metal duct attached to the front manifold.
Seems to work....

[richardthestag]

It does make quite a difference to the warm up time in the winter. The Stag has a manifold with a very large "wet" area, which means, when cold, a big area for the petrol vapour to condense and collect. That petrol drips into the combustion chambers and does not get properly burnt. To overcome this loss of fuel, you have to use the choke to fire in more fuel. For this reason a Stag when warm will do 30 mpg, but when cold, more like 15. So fast warm up is important if you want to save money. It can also be prone to stalling with sudden opening of the throttle when cold for the same reason. So this fast warm-up device is important in my view.

I lost my pipe to the LH manifold 25+ years ago.

Based upon the average 2500 mile per year that I have driven my car I doubt that my loss has contributed to the decline of the planet.

[MikeParker]

I lost my pipe to the LH manifold 25+ years ago.

Based upon the average 2500 mile per year that I have driven my car I doubt that my loss has contributed to the decline of the planet.

p.s. can I buy some of your drugs from you MikeParker

Richard,
I am not worried about the decline of the planet. I just find the car less enjoyable to drive until it is warmed up. Mainly, it is more prone to stall. It is part of my Stag driving technique (when the car is cold) to pull out the choke briefly if I need to do a fast pull out into a busy road. Also, the engine doesn't feel fully balanced until it is warmed up. Is that increased leaning of the mixture on some cylinders compared to others?
We are used to most modern cars feeling exactly the same to drive from cold start. That is not true of the Stag. To get the car going as smoothly and as responsively as I can is my drug!
Mike

[richardthestag]

Hi Mike, apologies for the p.s. on my original post - that was out of order.

I think your carbs need some attention maybe. It is not uncommon for folk to install the cold start / choke disc upside down inside the module. Also maybe worth checking that you are not running an excessively lean mixture until the engine starts to warm up and expand. Cold start choke mechanism as you know is not an on/off switch and needs to be adjusted based upon the ambient conditions.

I also greatly prefer the Rover v8 setup where by the choke module is only fitted to the LH carb and a pipe feeds the extra fuel to the RH carb. easier to set up and less moving parts.

I do agree entirely that these old things are not as smooth and convenient to drive as a new car, but then that is most of the charm of driving a classic car for me.

[jbuckl]

I fitted a left side alternator… no way to have the fast warm setup now. Haven’t noticed any difference though yet… but I don’t take her out in the cold! (So to speak!)
Fast warm up was a good thing though, so to speak !
Just too old for it now?