With the ceramic Thornly headders you really loose a lot of heat fast. I pulled a
hill tonight with the cover open to have Tom checking the carburetor settings.
The headers were red red red. But on the way down the hill they were normal with
in a matter of minutes. Absolutely little to no heat coming off the engine. Five
minutes after shut down you could touch the headers. I have the exhaust ports
(like a boat) on the side. They look good even if they don't do a lot. I think
the proper place would be within the inner fender wall just above the heads where
the heat seems to collect because of the flat surface at the back of the engine
compartment. Chuck Lompoc
> Paul,
>
> I don't see any problems with the cool down time, with or without the side
> vents. What I am really looking for is a quantifiable rationale for
> installing them. I don't believe the benefit is realized when underway
> because the volume of air due to ram at road speed and induction at low speeds
> is so large that the small vents would be insignificant in improving the
> venting of the engine compartment.
>
> Fred Hudspeth
>
>
> Subject: RE: GMC: Side Vents - GMCMh
>
> Fred:
>
> Just wondering what difference you see if it takes longer to cool the engine
> compartment area after engine shut down without vs. with same side vents?
> I've found that if you open the front access doors after shut down, you'll
> feel a significant amount of rising hot air escaping for a short while. But
> if it takes longer without facilitating the venting process, so what?
>
> I too, share your reluctance vs. the unsubstantiated benefits, particularly
> after I've installed ceramic coated headers.
>
> Paul Bartz
hill tonight with the cover open to have Tom checking the carburetor settings.
The headers were red red red. But on the way down the hill they were normal with
in a matter of minutes. Absolutely little to no heat coming off the engine. Five
minutes after shut down you could touch the headers. I have the exhaust ports
(like a boat) on the side. They look good even if they don't do a lot. I think
the proper place would be within the inner fender wall just above the heads where
the heat seems to collect because of the flat surface at the back of the engine
compartment. Chuck Lompoc
> Paul,
>
> I don't see any problems with the cool down time, with or without the side
> vents. What I am really looking for is a quantifiable rationale for
> installing them. I don't believe the benefit is realized when underway
> because the volume of air due to ram at road speed and induction at low speeds
> is so large that the small vents would be insignificant in improving the
> venting of the engine compartment.
>
> Fred Hudspeth
>
>
> Subject: RE: GMC: Side Vents - GMCMh
>
> Fred:
>
> Just wondering what difference you see if it takes longer to cool the engine
> compartment area after engine shut down without vs. with same side vents?
> I've found that if you open the front access doors after shut down, you'll
> feel a significant amount of rising hot air escaping for a short while. But
> if it takes longer without facilitating the venting process, so what?
>
> I too, share your reluctance vs. the unsubstantiated benefits, particularly
> after I've installed ceramic coated headers.
>
> Paul Bartz
