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| How Long Does it Take to Burn out an Exhaust Valve? https://www.slantsix.org/forum/viewtopic.php?t=22115 |
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| Author: | Daddiojoe [ Mon Mar 05, 2007 2:17 pm ] |
| Post subject: | How Long Does it Take to Burn out an Exhaust Valve? |
I'm working on installing my Dutra Duals, and need to go to the exhaust shop to hook them up. I'd like to save money by installing the manifolds on the heads before I go, and also like to save money by driving twelve miles or so to the muffler shop. I'm not worried too much about being loud or getting a ticket for that. The cops love me. (And old trucks--this is Texas!). I am worried about damaging my engine. What say you all? Thanks, Joe |
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| Author: | rosspulliam [ Mon Mar 05, 2007 3:09 pm ] |
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I've driven with open headers before, but never open manifolds. I guess my worry would be all the exchaust gasses getting dumped under the hood rather than under the car. Can you fab up a pip to direct the gases out of the engine bay until you can get to the exhaust shop? If I couldn't do anything else I'd probably just drive it and be done with it...I really doubt it would hurt anything, though I may be wrong. |
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| Author: | Pierre [ Mon Mar 05, 2007 3:20 pm ] |
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With manifolds that short I'd be worried about raw flames coming out too if you go rich when you accelerate, etc and toasting things around the outlet. Check with your insurance company they may offer discoutned tows - or the exhaust shop itself they may have connection with local company. My exhasut guy towed my car to his shop on his own trailer. |
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| Author: | Jeffc [ Mon Mar 05, 2007 3:28 pm ] |
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I would say that it somewhat depended on how damaged the valves are now, but could push them over the edge if you have a lot of miles on them and/or have had exhaust leaks before...... Running just the mans makes it pretty easy for cold air to get to the valve and cause fast cooling, I would want some pipe on them at least to slow it down some....... at the very least on the short one...... good set of ear plugs too 
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| Author: | SlantSixDan [ Mon Mar 05, 2007 3:30 pm ] |
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Yeah, with those manifolds dumping out under the hood, you'd have a hard time keeping the engine running (exhaust being drawn into the intake tract), and you'd be running a serious risk of carbon monoxide poisoning. You may want to rig up even a cheesy temporary flexible pipe to bolt up and duct the exhaust out from the engine bay. The towtruck idea (pref. flatbed) is probably best. |
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| Author: | Jeffc [ Mon Mar 05, 2007 3:35 pm ] |
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Quote: With manifolds that short I'd be worried about raw flames coming out too if you go rich when you accelerate, etc and toasting things around the outlet.
Agree!Check with your insurance company they may offer discoutned tows - or the exhaust shop itself they may have connection with local company. My exhasut guy towed my car to his shop on his own trailer. Anouther possable> have the shop rig you a set of short pipes....... |
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| Author: | sandy in BC [ Mon Mar 05, 2007 4:20 pm ] |
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Burning the exhaust valves by running no pipe is an old wives tale. The other issues are real though. |
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| Author: | AnotherSix [ Mon Mar 05, 2007 4:27 pm ] |
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I would not drive it with open manifolds. Some small diameter quickie down pipes would work, but for the expense and time a tow would be better. As pointed out check with your muffler guy. If you call around for a tow make sure you let them know it is not an emergency and ask when would be the best time for them and best price for you. |
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| Author: | Bren67Cuda904 [ Mon Mar 05, 2007 4:32 pm ] |
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If there is any traffic at all I think you'll melt down then burn, if you can keep the engine running like dan said. Maybe buy a AAA membership, wait the 10 days (I think) and have it towed. (flat bed) The AAA memberships, at least the Plus level give you (4) 100 mile tows a year, along with other benefits. It good to have anyways. I think it about $130 a year. A simple tow might be cheaper but it comes with no other benefits. I don't work for AAA 
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| Author: | SlantSixDan [ Mon Mar 05, 2007 5:14 pm ] |
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Quote: Burning the exhaust valves by running no pipe is an old wives tale.
Yeah, but warping them ain't.
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| Author: | Jeffc [ Mon Mar 05, 2007 6:19 pm ] |
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Quote: Quote: Burning the exhaust valves by running no pipe is an old wives tale.
Yeah, but warping them ain't.Most valve damage is done by too much heat, .i.e over heating....... not over cooling (however, cold air up the pipe may or may not cause damage). And you may note above, I said it would depend on what kind of shape the valves are in now. However, exhaust mods and leaks, without the right adjustments to the intake side, carb in this case, can lead to a lean burn were too much heat is not able to be removed from the cyclinder, even with nothing after the head. Exhaust leaks alter the ballance-- strait pipes, short pipes, headers, pipe size, ect................... all have effects on the burn. Sometimes lean, sometimes rich........ |
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| Author: | rock [ Tue Mar 06, 2007 2:03 pm ] |
| Post subject: | I asked this last fall and did what brencuda is saying now.. |
Check the old threads...I asked this last fall and the consensus was it would be better to not drive it. After I drove around a bit with 2 foot stubs on the dutras just to hear it roar. Highest class AAA for family cost me $98 a year. Had it flat bedded to muffler shop 18 miles one way as one of the 4 "free" carraiges as membership. The membership is one of the great deals in my opinion because as an experimenter I sometimes need a service like this lift to muffler shop. I figured as many thousand dollars as were in the engine and parts, $98 more was cheap insurance. rock '64d100 |
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| Author: | RDJ [ Tue Mar 06, 2007 2:35 pm ] |
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I'm glad this thread came up. The guy who is going to do my muffler gave me some pipe, and I have an old flange, so I was going to drive it up (BTW, I wasn't going to run an open manifold). But my insurance does have towing on the plan, maybe I should just use that. One problem is, I am going to install a 4 bbl at the same time, will need to get it running and adjusted. Should I just get the exhaust done first, tow it back, then deal with the 4 bbl? Obviously I am going to put the 4bbl offy intake manifold on the same time as the Dutra/split exhaust manifold. |
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| Author: | Daddiojoe [ Wed Mar 07, 2007 12:51 pm ] |
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Good thread! Thanks for the tips. I'm going to have it towed to the muffler shop. Joe |
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| Author: | rock [ Wed Mar 07, 2007 1:38 pm ] |
| Post subject: | RDJ, well since every ...has an opinion, here is mine |
RDJ, I wrestled the same issue re. the 4bbl.. YOu will see my thread about running like a fuelie and shooting fire out the Dutras! I decided to get the carb on and run the cam in for 20 mins because the point of the exhaust was to get a tuned exhaust. Kinda hard to hear if you like the sound at the shop without having the carb on and engine set to run. In those threads you will see a fine support group offering opinions on how long the pipes needed to run back to the union to a single pipe. CHeck it out. Oh, I would NEVER use insurance to do the tow or lift...those folks have a way of raising rates or cancelling for nothing the next call. Even a cheap AAA is a good thing, or horrors, just pay for it if close... Watch that firing order! rock '64d100 |
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