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73-87 Chevy _ GMC Trucks => Performance => Exhaust => Topic started by: chronos on August 27, 2009, 07:58:24 pm

Title: Heat riser on exhaust question
Post by: chronos on August 27, 2009, 07:58:24 pm

My heat riser is busted and I want to wire it open.
The question is what is the open position?
Is pulling the lever towards the firewall 'open' ??
Figure thats the easiest way to explain it

Title: Re: Heat riser on exhaust question
Post by: maddog on August 28, 2009, 06:31:53 am

If the bi-metal spring when it heats up would normally turn it clockwise to open you can verify this by looking at spring but in your case the spring is most likely gone, the other thing you could do is with engine running move damper you will know when it's open and closed.

Title: Re: Heat riser on exhaust question
Post by: chronos on September 12, 2009, 11:33:20 am

Got a pic of riser lever today.
Still not sure what is the open position
Any help would be great.Thanks

Title: Re: Heat riser on exhaust question
Post by: VileZambonie on September 12, 2009, 01:39:52 pm

Up should be closed. Why not take it out and gut it?

(http://i6.photobucket.com/albums/y228/Sabaka454/heatriser.gif)

Title: Re: Heat riser on exhaust question
Post by: chronos on September 12, 2009, 02:38:27 pm

Thanks Vile , so is it closed in my pic do you think?
Hard to tell for sure from the diagram but it looks like if
I push the lever down 'towards the front of the truck'
it will be open?
I moved the lever and took another pic of the
lever in the position I hope is open

Title: Re: Heat riser on exhaust question
Post by: chronos on September 12, 2009, 03:44:56 pm

here is the pic