I know that, but Im talking dragsters since thats what everyone is bringing up. But even with that said, most race cars dont use just an open header, they have a pipe getting the exhaust to the side or rear of the car. Perfect scenario today. I took the car to the dyno and the guy said he wouldnt run it until the exhaust leaks were fixed because it would burn a valve. I thought he was retarded and I wanted it dynoed anyways, but i didnt tell him that. Its bad enough he has a monopoly on this area, only dyno within an hour and he charges $115 an hour!!
Why is running open headers bad...
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I've also heard that running simply open headers can possibly cause a fire or something.. any truth to this? I mean open headers as in no dumps, since it's scavenging all the exhaust gases to the undercarriage of your car, where all the fuel and brake lines run and such. More of a myth I haven't really heard much talk about I guess
65ShelbyClone
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If the exhaust heat is hitting the floor, fuel lines, or anything that can burn for long enough to ignite them, then fire would be an issue. On a Fox with shorties it would be a BIG concern since they would dump so high up in the bay.
Best thing to really do is get headers if you want and then just pipe a straight pipe back not only is it better for the motor but it gives the exhaust tone
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Just gonna leave this here....
The exhaust spends less time heating the valve with less back pressure. That’s good.I thought it also had something to do with a lack of backpressure or something
If your carb runs lean and is not rejetted, that can make the engine run hot.
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