The Ford Barn - So whats it for?

The Ford Barn (https://www.fordbarn.com/forum/index.php)

- Early V8 (1932-53) (https://www.fordbarn.com/forum/forumdisplay.php?f=4)

- - So whats it for? (https://www.fordbarn.com/forum/showthread.php?t=291702)

35ragtop

12-17-2020 01:30 AM

So whats it for?

2 Attachment(s)

Hi guys,
I took this fitting out of the exhaust system (LHS below the manifold) on my 48 Mercury. I would like to know its correct purpose please. To me it would seem that it is for some cold weather purpose but in our climate it would be of no benefit. The car is ex California in recent times.
I look forward to your opinions. I couldnt find any reference to it in my parts book.
thanks
Dave

Alaska Jim

12-17-2020 01:35 AM

Re: So whats it for?

That is a heat riser. its function is to cause enough back pressure to force more of the exh. gas through the intake manifold crossover to help heat the fuel during cold weather to help atomize the fuel, so that it ignites easier for cold weather drivability. yours is missing the spring that opens the valve as it heats up and reduces the back pressure. when it is cold, before the engine is run, the valve is normally closed. hope that this explanation makes sense to you.

McMimmcs

12-17-2020 04:54 AM

Re: So whats it for?

i think they called them a heat riser valve,

54vicky

12-17-2020 10:09 AM

Re: So whats it for?

to add to what is written it is missing the spring that fits on the outer portion.they are (were) handy if you live in a humid climate as they helped with warm up and kept (keep) the moisture from freezing in the throat of carb while engine warms up.later years used a pipe from the manifold to do a similar thing.common until F.I. came along

34PKUP

12-17-2020 10:37 AM

Re: So whats it for?

Quote:

Originally Posted by 54vicky (Post 1963807)

Obviously in your state of exuberance, you failed to read post #2 above :confused:

McMimmcs

12-17-2020 10:53 AM

Re: So whats it for?

Quote:

Originally Posted by 34PKUP (Post 1963816)

Obviously in your state of exuberance, you failed to read post #2 above :confused:

Not a big deal, better to be told twice than not at all !

51woodie

12-17-2020 01:49 PM

Re: So whats it for?

Check on eBay. There are a few listed. Mac's also lists one for a Tbird. Just need to confirm c/c on the bolt holes, and size of the bore.

https://www.ebay.com/itm/NOS-FoMoCo-...-/380967885863

https://www.macsautoparts.com/1955-1...6-28306-1.html

35ragtop

12-17-2020 03:23 PM

Re: So whats it for?

Thanks fellas,
I knew that the answer would be here on this site.
I definitely dont need to warm anything up in our climate. It will make a nice conversation piece on the bar top.
Merry Christmas
Dave

Lawrie

12-17-2020 04:10 PM

Re: So whats it for?

Dave you might want to modify that to help the dist stay warm and run in deep water.LOL
Lawrie

All times are GMT -5. The time now is 08:05 AM.