No more annoying noise and there seems to be no noticeable affect on the engine whatsoever. I did buy a good used replacement one cause my old one was about rusted away but the more I look at it, I think restriction. So the claim made that the Cat has a straight thru pipe performed by same mechanics needs to be verified. Ted Both work equally well in theory. I'm sure this one has been dragged through the coals but here goes. As to running heat to the manifold, I think there must be something to it or all those high paid automotive engineers who developed heat risers would not have wasted their time coming up with them and profit minded car companies would have stopped installing them if they did not help with how the car ran.
You have to be the expert on if this is your part or not. I know this because I go out your way this time of year. This eBay page shows what it looks like: I called my local parts dealer and they said they've been discontinued. It needs to be reduced as the engine warms up or other problems arise such as carb boiling, reduced power, etc. Very nice part, with box, has a casting ew. General Motors and Oldsmobile are trademarks of their respective companies.
I'm not against catalytic converters, but those originals really didn't play well with carbs. Rapid heat is more desirable because it provides for better fuel evaporation and a more uniform mixture. Tue, 31 Mar 2009 00:00:00 -0700 One proposed solution to prop up new-car sales in the United States involves paying bonuses to owners of older vehicles who send their cars to the scrapyard and buy new ones. Should the intake corrode from the exhaust one day, I get another one. The valve shaft also may be seized, so the butterfly is stuck in a stationary position. Nevertheless I would like to get the vacuum switch replaced at some point. The vacuum sensor is mounted on the rear of the intake manifold behind the carburetor, and has a short vacuum line connected to the rear of the carb.
When I lived in Florida, we used to remove any heat riser valve, and block off the heat riser passages completely to make the cars run faster in the warm weather. Since cat was recently removed, it should not be much trouble to deal with. Thanks for the info, It helped me understand it's function alot better. Now I could be wrong on this but that's always how I thought it worked at least on an Olds. If it failed in the closed position you would have all the exhaust on one side traveling under the carb and boiling the fuel.
It does get to freezing temperatures here during a short time of the year. Mine has the vacuum line running to it. I searched the forum but could not find my question specifically answered. Hmmmm, I just noticed in his profile he says he has an 86 with a 5. The vac motor holds vacuum. This auction is for a new old stock Gm group No international bidding or shipping. This system is used to provide a source of rapid heat for quick induction system warm-up during cold engine operation.
. Sold as is no return. Perhaps I can just disconnect the line to it so it stays open and prevents overheating if possible; and block off the line. Gm part payment seller accepts paypal, visa. These parts can be difficult to find sometimes but since we have a large network of salvage yards and part suppliers chances are always pretty good that we'll be able to help you find the parts you need.
What function does it serve? One can sometimes reduce or eliminate one of the variables while significantly increasing the other two. The other shows a six cyl version. This is important because the stock carb is jetted for use with hot intake air. This part was used up until the '90 Caprice I believe and he said those too are discontinued. This web site is not affiliated with General Motors or Oldsmobile.
I still need to send my 52 to your brother to have the front end done! I'm thinking about getting Fentons but I'm afraid they won't provide enough heat in the dead of winter low teens since the tubes are so small, and provide too much heat in the dead of summer high 90s since there's no way to stop the exhaust. No vapor lock or too hot intake in the summers even after long freeways trips and I don't even use carb spacers on the cast aluminum intakes. Years ago I ran two and three carbs on a chev six and never seemed to have any real problem but then that car was so suped up it was cranky anyway. For parts availability questions please contact us at. Efe Exhaust Valve For Sale There are 8 parts available and for sale through our network of salvage yards. In the summer with the engine warm it hurt performance a good bit if you didn't block them off and keep the intake cool. Maybe this is where things got changed around.
He could make it about two miles before the carb would ice up and stall, then sit for 4-5 minutes while the heat rose from the engine and thawed it out. When the engine starts to warm up, the heat riser valve opens and quits forcing heat to the heating pad in the intake manifold. The idea is to heat the intake manifold just enough to keep fuel atomized and suspended in the intake airflow and prevent fuel puddling. With the line broken, the valve in the exhaust isn't opening and blocking exhaust. It really should be thermostatically controlled one way or another. If there was one correct answer, everyone would be doing it. There may be a few exceptions, but that's the way it was.
Nos new old stock Gm gr this exhaust manifold heat valve. Too much heat is very bad. I'll have to check my service manual and see. Thrid picture, if that is the sensor on the passenger side fender, then that is your barometric pressure sensor. When are you ever going to find one? I put a rochester bc on the 235 and now use my choke cable to control the heat valve.