Re: IML: Heat riser rotation?
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Re: IML: Heat riser rotation?



The clock spring on the riser valve is not a thermal spring. Opening and closing, is a function of exhaust gas flow(volume). When closed, all exhaust gas runs through the passage under the carb, this pre-heats the mixture for better cold weather warm-up.However if the valve is stuck shut ALL exhaust from the right bank, will pass through the manifold with less than a one square inch of passage.This only leads to poor performance, and lean carb conditions. There was also a small coil spring, for anti-rattle at low speed, or idle.Ya'll have a nice day, Dave.
 
-------------- Original message --------------
From: 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 t he 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.
>
> Â
>
> -------------- 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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