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No Exhaust Backpressure

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Mark

09-23-2001 16:32:52




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My friend has fitted his car with a Sports exhaust said to improve performance by allowing the exhaust gases to escape easier. The problem is the car is now difficult to start. The mechanic said that this is because there is no back pressure, Why does it need back pressure? i seldom fit the exhaust to my TE20 when i am tuning it etc, am i doing something wrong?




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Evan MacDonald

09-23-2001 19:36:27




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 Re: No Exhaust Backpressure in reply to Mark, 09-23-2001 16:32:52  
That mechanic is full of it.... I run my truck open headers all the time.... It won't hurt your tractor a bit, but, a well tuned high performance engine will run a bit lean if the exhaust is removed/made more free flowing until it is re-tuned, that only applies to a carbed engine mind you....
Evan



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Bryan

11-14-2002 09:34:16




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 Re: Re: No Exhaust Backpressure in reply to Evan MacDonald, 09-23-2001 19:36:27  
I couldnt agree more, my pickup, a 97 chevy silverado vortec has has the exhaust chopped off, it is not carb, efi, and it has been like that for months, and not a one problem. in fact i gained about 20 hp from that little thing. still running like a beast.



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eddie

10-02-2001 17:30:03




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 Re: Re: No Exhaust Backpressure in reply to Evan MacDonald, 09-23-2001 19:36:27  
i cant disagree with evan more. as a mechanic with a honda /kawasaki dealer, in ky i have installed many after market exhausts on different applications. on all applications the exhaust system being less restrictive causes several problems, only one of which is harder starting in many cases. all engines are set up at the factory to meet epa regulations not total performance. all of the fuel is not burned on each firing stroke. the back pressure keeps some of the unburned, as well as some of the burned fuel, in the cylinder. by opening the exhaust system up you allow more of the leftover gases to leave the cylinder. this causes a lean condition in the engine,evident often times is a noticeable sputter or hesitation just off idle. a lean condition will also allow the cylinders to run hotter, causing a "spark knock" in many cases.
a very lean cndition may also lead to a burned valve, piston, or even cylinder wall.in my opinion, i would contact the maker of the exhaust. with the info about the car it went on and see what thay recommend, as far as fuel sytem enhancements, to allow the engine fully take advantage fo the now opened exhaust. but again all of this is just my opinion

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