Re: IML: Heat riser rotation?

[sosmi@xxxxxxxxxxx]

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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