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BobSeger
Dodge Dakota
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4/10/2007
18:15:26

Subject: Open Headers
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Right now I'm just running an aftermarket cat, no muffler. I was contemplating open headers for a little while. Any downsides to this? Will it harm the motor? If not, what about straight pipes? I know you guys see that as a ghetto way of getting nice/loud sound, but I just love the way it screams.

BTW, 1998 Dakota CC 5.2L 4x4.



N56629
Dodge Dakota
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4/10/2007
19:19:08

RE: Open Headers
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Knock yourself out, the only thing you are likely to hurt is your wallet.



how about
Dodge Dakota
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4/10/2007
19:29:53

RE: Open Headers
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burnt valves



BobSeger
Dodge Dakota
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4/10/2007
19:45:02

RE: Open Headers
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Can you guys specify? Burnt wallet as in it will result in expensive repairs? And how will it result in burn valves? Will both straight pipes/open headers cause that?



midnightdak
Dodge Dakota
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4/10/2007
21:02:59

RE: Open Headers
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The only thing that you will have to worrie about open headers is that it will cause fumes to get into the cab. It will also bend valves in cold weather but i don't think you would have to worrie about that unless you are up north. Will not harm engine will just be very loud and will make engine run better.



Capt Obvious
Dodge Dakota
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4/10/2007
21:47:19

RE: Open Headers
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to set the record straight, you'll have a better chance of bending a valve due to a timing chain failure than by running open headers. the hot head/header temps will keep cold air from rushing into the chamber if by chance the exhaust valve is open at shutdown.

a burnt valve is the result of a lean condition that will erode away valve material due to excessive gas tempratures. this will eventually lead to loss of compression. some valves will just split from the outside inward.

last but not least, if open headers cause bent valves, how do you explain why top fuel and top alchohol motors do not have bent valve issues?

thats your lesson for the day boys and girls. dont forget to leave an apple for the teacher.



ryan
Dodge Dakota
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4/10/2007
22:18:04

RE: Open Headers
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captain obvious, why is it that top fuel cars like the in the NHRA have to rebuild the motor every time they make a pass? open headers are stupid unless you've got a motor heavily modded. in fact once you cut off the exhaust you'll see how much power you lose.



Bob Seger
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4/10/2007
23:28:26

RE: Open Headers
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I'm just going to remove the cat and run a straight pipe back from the headers. Should sound good.



Capt Obvious
Dodge Dakota
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4/11/2007
00:05:14

RE: Open Headers
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ryan, fuelers dont rebuild the motor just because they MAY have bent valves. the rod bearings take some serious punishment among other maintainence issues. but if we use your answer, pro stock, super gas, etc.. crew chiefs dont rebuild their motors every round. they may change valve springs, adjust valve lash, make carb & clutch adjustments and let it fly. so your reasoning is out the door!

next?



Super bee
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4/11/2007
00:46:07

RE: Open Headers
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2 passes and clutches are welded together, SWEET!!!!

the only problem i have run into with my headers is the cheap paper gasket material burnt up and a chunk broke away and they leaked
just replaced with a Mr Gasket
now its all better

1990 sport RC SB, 1995 318drivetrain, 3.92 gears (came with truck) Powertrax "traction system", 95 dash/steering wheel, hearthrob exhaust, headers, cutout after y-pipe, necessary electric fan add-a-leafs, 30x9.5 mud tires, cranked T-bars, AR 39 15x8 rims, grill guard, roll bars

PACO
Dodge Dakota
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4/11/2007
09:34:58

RE: Open Headers
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open headers are only gnarly on wicked rides with long tube headers and beastly cam with a orgasmic lope to it!



Capt Obvious
Dodge Dakota
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4/11/2007
09:43:59

RE: Open Headers
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PACO, precisely!



N56629
Dodge Dakota
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4/11/2007
21:05:16

RE: Open Headers
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Open headers are no different than using cut-outs. A possible fine is the only reason that it will be hard on your wallet. Without the O2 sensors you will most likely be running rich, not lean.

It's possible to warp a valve but only if you abruptly close the the throttle after a long wot pass in cold weather. This is one reason you don't typically see it in drag racing or stock car racing which a bit more like what we are talking about.



urretarded
Dodge Dakota
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4/12/2007
23:27:45

RE: Open Headers
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Put your muffler back on and get back in the trailer. Stupid questions like that are the reason why this site sucks.



PACO
Dodge Dakota
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4/13/2007
10:52:28

RE: Open Headers
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ryan you asked captain obvious; why is it that top fuel cars like the in the NHRA have to rebuild the motor every time they make a pass?


i'll add some more info to captain obvious's correction. if its a rebuild its because the motor is so vicous that it will twist the crank more than 20 degrees and have to have a cam lobes ground offset to rephase valve timing insync with its weird timing, basiclly everything that flows spark is fried, the fuel burning more than 7000 degrees will takes its toll in the top end. you also dont need a heavily modified motor for open headers or cut outs...a cam only engine with stock short block will make more horsepower with open headers, i know my bros Ls1 always did.



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