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Straight pipes and valves

79bonanza said:
just curious what is this goin to be in
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The k5 of course. Ive always pieced my exhaust together with about 9 or so different pieces so i had one mandrel bent up at a local shop. Just deciding if i should run it open pipes until i can afford the borlas i want or buy some cheap ones until then. i know if i buy the cheap ones though, that they will become permanent
 
I think the valve burning myth is just that--on a street driven engine in stock form its rare to have any valve burning troubles caused by too little back pressure...most valves burn from preignition and pinging than anything else on stock engines..

On a race car like a dragster with "zommies" the racers always put tennis balls over the pipes or stuff rags in them,to prevent the exhaust valve heads from warping,they can,and they will,if cool outside air blows on them after a hard run...but on our "normal" stock engines I doubt we'd ever see that happen..maybe in a dirt track/demolition derby situation where they are pushed to the limits maybe...
 
diesel4me said:
On a race car like a dragster with "zommies" the racers always put tennis balls over the pipes or stuff rags in them,to prevent the exhaust valve heads from warping,they can,and they will,if cool outside air blows on them after a hard run...but on our "normal" stock engines I doubt we'd ever see that happen..maybe in a dirt track/demolition derby situation where they are pushed to the limits maybe...
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Not always, we raced my buddies el camino for a couple years. Straight zoomies (was hard to drive around). Built to the hilt 454 never burned a valve and never put anything over the zoomies.

You couldn't go over any kind of rough road in that car and needed ramps that were like 20 feet long to get it on the trailer
 
if you just run open headers or manifolds, its goin to get annoying really quick being so loud lol, but striaght pipes all the way back would be fine
 
I believe stock valves will burn up with just headers or manifold (thought it had something to do with backpressure though), but I've heard stainless steel valves don't have this problem... again "hear say"
 
The first time I installed my headers I guess I didn't tighten them to the rest of the exhaust tight enough so all the bolts rattled out while I was out on the trail. So I essentially had straight headers. I towed some jeep that was broken down back to his camp site this way. I then drove 100 miles back home this way also. Was really LOUD!!. Pulled up to a light next to a nice bmw. Light goes green and I purposely smashed the pedal. Scarred the crap out of the people next me. Was hillarious my girlfriend was hiding in the floor board she was embarased lol.

Had fun with it on the way home never had a problem.
 
Well...if cold air can suck back into the engine... I hope you carb guys don't stall out in 2 feet of water :dunno:
 
DokWatson said:
Well...if cold air can suck back into the engine... I hope you carb guys don't stall out in 2 feet of water :dunno:
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Another one of those myths...I've had trucks stuck in water over the exhaust pipe twice. Neither time did it suck water up into the motor...in the Suzuki Samurai or the Chevy truck.
Both times, pulled them out the next day after sitting in water all night and started right up with no problems.
 
i've stalled with the pipes under water and fired it back up with the pipes under water and had no problems
 
I think its a myth too. I've always wondered though, why at the drag strip do you always see covers over the pipes on the old nastalgia drag cars. Front engine, old school type stuff. Just myth believers or.....
 
cybrfire said:
I think its a myth too. I've always wondered though, why at the drag strip do you always see covers over the pipes on the old nastalgia drag cars. Front engine, old school type stuff. Just myth believers or.....
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I think that's just to keep crap from getting in the exhaust pipe.

On my grandpa's farm, our tractors had those caps on a hinge that closed when it wasn't running. It would stay open while the engine was running and close when it wasn't. It was just to keep anything from falling down the exhaust pipe when it wasn't running.
 
cybrfire said:
I've always wondered though, why at the drag strip do you always see covers over the pipes on the old nastalgia drag cars. Front engine, old school type stuff. Just myth believers or.....
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So the competition does not drop BBs and such into the engine. :haha:
 
cybrfire said:
I think its a myth too. I've always wondered though, why at the drag strip do you always see covers over the pipes on the old nastalgia drag cars. Front engine, old school type stuff. Just myth believers or.....
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because when an engine stops, a couple exhaust valves are still open and dust/debris may get into the combustion chamber.
Funny incident I saw one time at the drags a couple decades ago, a TF was in the pits doing a tuneup fireup, and people are standing around it, and they turn over the engine but it don't fire....a little investigation finds the mag isn't hooked up, so then they turn it over to fire it again, and the headers have a bunch of fuel in them that when the engine fires the fuel gets blown all over the people standing behind the car...:haha::haha::haha:
 
76zimmer said:
because when an engine stops, a couple exhaust valves are still open and dust/debris may get into the combustion chamber.
Funny incident I saw one time at the drags a couple decades ago, a TF was in the pits doing a tuneup fireup, and people are standing around it, and they turn over the engine but it don't fire....a little investigation finds the mag isn't hooked up, so then they turn it over to fire it again, and the headers have a bunch of fuel in them that when the engine fires the fuel gets blown all over the people standing behind the car...:haha::haha::haha:
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And then the car started and shot a flame and lit all the people on fire?
 
Nope just raw fuel got em....or maybe it was water from a rain, who knows?
 
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