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#1 |
Registered User
Join Date: Mar 2003
Location: fresno,ca
Posts: 5
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How important is this exhaust damper? My spring broke. Any ideas? please help. My first 250 I-6.
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#2 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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Welcome to the board from West Michigan!
My experience indicates that you don't need them, especially in warmer areas. We don't use the heat risers in our exhaust systems in Michigan, but in real cold areas, they may be of some benefit to help the engine warm up faster. The other question, you may be faced with is does California expect them to work. Jim |
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#3 |
Registered User
Join Date: Mar 2003
Location: fresno,ca
Posts: 5
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Thanks for the input jim. 71 is calif. exempt from smog. Do I weld it open or shut?
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#4 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Be carefull...they are trying to make your truck get smogged again.
With that said, weld it shut. |
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#5 |
Senior Member
Join Date: Jul 2001
Location: Muskegon,MI,USA
Posts: 6,026
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I would set it up, so that it is open all of the time. Otherwise the exhaust will back up.
Jim |
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#6 |
Registered User
Join Date: Mar 2003
Location: fresno,ca
Posts: 5
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How about half way open? Any ideas where I can find some org. side mirrors?
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#7 |
Semi-Senior Member
Join Date: Feb 2003
Location: Washington, MO
Posts: 390
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coming from a mechanic who used to fight engines with carberators, be ready for some things to happen. If you wire it open you MAY have cold engine hesitations. You also may get carb. icing up in cold, humid weather. There were many cases I fixed bad running cars just be lubricating and losening up the heat riser.
The riser being open will not affect emmissions out the tailpipe. Either wire it open or replace, don't leave it half way. Steve ![]()
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'68 50th Anniversery LWB Custom Fleetside, '77 305 v-8, turbo 350, factory speed alert (still works), '71 drivetrain w/front discs. Some call it ugly yellow, others call it Ochre '83 Jeep CJ-7, <80,000 miles, original owner '04 Chevy Suburban, 4x4, 2500, 6.0 ltr, Predator Diablo programmer '95 GMC K1500 Extended cab |
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#8 |
Registered User
Join Date: Mar 2003
Location: fresno,ca
Posts: 5
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OK I found a spring to put back on this manifold. When it is on, is the damper to be shut or open?
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#9 |
Senior Member
![]() Join Date: Feb 2003
Location: WIS
Posts: 1,752
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riser
Technically, it's know as a heat riser valve & should be closed when cold and wide open when everything is up to operating temp. When the engine is cold gasoline doesn't vaporize very well, so GM put this valve in there to force exhaust gasses thru openings in the head, thru the bottom channel in the intake manifold, thru the opening in the other head & out that exhaust pipe.......Zoomy
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#10 |
Registered User
Join Date: Mar 2003
Location: fresno,ca
Posts: 5
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Thanks, Zoomy. I will get this done today.
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