Throttle body heating

[blitzracing]

I know its practice to remove the water heating from the inlet manifold, but I notice there is a small bore pipe heating the throttle body. Is this purely a cold start system I can disconect to help keep the inlet charge cool ? Thanks

[victormeldrew]

Which model/year is this on? My 96 500 doesn't have the throttle body heater connected at all.

[cln1]

No, my 98 500 doesn't have the heating facility connected. The water connections are there but not piped up.

Colin

[GreenV8S]

blitzracing said:

I know its practice to remove the water heating from the inlet manifold, but I notice there is a small bore pipe heating the throttle body. Is this purely a cold start system I can disconect to help keep the inlet charge cool ? Thanks

That small bore pipe is the thing that people remove/disconnect. You can't prevent the water from heating the main inlet manifold, because the manifold is an integral part of the cooling system.

[blitzracing]

You've spotted an imposter- I have a 92 Ginetta 3.9 G33, but this is the place to get the answers I need, so thanks. I can see the channel / chamber the feeds water from the head to the manifold. What then are the 2 metal pipes that run between the V to the heater, one feeding through the base of the manifold (is this extra heating ?), plus the small bore pipe that feeds the throttle body.
thanks
Mark

[blitzracing]

Dont worry, Ive just had a closer look, It looks like the heater and inlet manifold are in parallel and cant be disconnected, so Ill just disconnect the throttle body.

[GreenV8S]

blitzracing said:

You've spotted an imposter- I have a 92 Ginetta 3.9 G33, but this is the place to get the answers I need, so thanks. I can see the channel / chamber the feeds water from the head to the manifold. What then are the 2 metal pipes that run between the V to the heater, one feeding through the base of the manifold (is this extra heating ?), plus the small bore pipe that feeds the throttle body.
thanks
Mark

There's normally a metal pipe out the back of the water chamber that feeds the heater, and a similar return that comes back under the plenum parallel to the first one, straight past the water chamber and out the front where it connects to the pump inlet. You'll also have a bypass from the *front* of the water jacket that feeds to a second point on the pump inlet - this is the bypass. If you don't want a heater, you can just blank these two metal pipes off or connect them together through a restriction to form an extra bypass. The throttle body heater should be fed from the manifold and returned to a spigot on the second metal metal pipe - the heater return. The flow through the throttle body heater is so low that you can just blank off both small hoses, or loop them together, whichever is more convenient.