Re: IML: Heat riser rotation?

[David Wilker <wilkerbeast01@xxxxxxxxxxx>]

You could try finding another car with a working valve, and try it. See which way the valve opens. The spring will expand when it gets hot, so my guess would "against" the spring pressure. Maybe try moving it when the engine is running and seeing which way makes the engine run best?Isn't there a cross-over passage through the intake manifold to allow that side of the exhoust to go out the other manifold? I think it was to heat the intake up on cold starts.
--


David C. Wilker Jr.
USAF (RET)

---- randalpark@xxxxxxx wrote: 
I have seen the counter weight slip on these, particularly between '64 
and '66. The only way to determine with certainty that the valve is 
open is to remove the exhaust pipe and look. The idea of comparing the 
amount of exhaust coming from the right side vs. the left side is a 
good one, but most Imperials built since 1962 have a single exhaust 
pipe, rendering this test useless.

If the valve is stuck closed the car will over heat. If the valve isn't 
stuck, then it will always open when the engine is "reved". The counter 
weight isn't strong enough to keep it closed. If it is moving, it is 
working fine. If it isn't moving, then you should be concerned.

Paul W.


-----Original Message-----
From: nicholasadamo@xxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Thu, 16 Aug 2007 5:38 pm
Subject: Re: IML: Heat riser rotation?



So Dave, I've wondered about this too. If the valve is open (engine 
warm position), it is rotated all the way clockwise??? The cold 
position would be all the way counter-clockwise or too the left?  I am 
correct??

-----Original Message-----
From: sosmi@xxxxxxxxxxx
To: mailing-list@xxxxxxxxxxxxxxxx
Sent: Thu, 16 Aug 2007 4:52 pm
Subject: Re: IML: Heat riser rotation?



NOT a dumb question, If memory serves me correctly, the valve rotates 
clockwise. There should be a stop pin which prevents the valve from 
opening past center.If you feel a lot of restriction opening the valve, 
its possible to break the spot welds on the valve, and it will remain 
shut.If you have dual exhaust, have someone listen to the right pipe 
for a louder exhaust sound, when you open the valve.This is one of the 
simplest issues for performance, and mileage that goes un-checked.When 
we remove the manifolds, we remove the valve completely.Ya'll have a 
nice day, Dave.

 

-------------- Original message --------------
From: therichardsonfamily@xxxxxxxxxxx

> Dumb question time:
>
> On a '67 440 (from an Imperial - required content), looking at it 
from the
> passenger's fender, which way does the heat riser rotate as it opens? 
I suspect
> mine does not work correctly and I want to wire it open.
>
> Dan Richardson
> 300L Family Heirloom
>
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