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Re: Will straight pipe hurt motors??
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Posted by Mark - IN. on October 14, 2005 at 05:13:29 from (205.188.117.6):
In Reply to: Will straight pipe hurt motors?? posted by logan on October 13, 2005 at 19:54:20:
Yes, no, and maybe. First off, it's not back pressure that prevents valves from floating, it's spring pressure. The weaker the spring, the better the chances of valves floating at higher RPMs. The stronger the spring, the less chance, but the more wear and tear on the rest of the valve train (cam lobes, fulcroms, etc). Back pressure actually keeps the face and back of the valve at a more even temperature, which lack of can cause failure. Too little back pressure over time and will notice damage caused because the face of the valve is typically hotter than the backside exhausting the burnt gases into a cooler manifold, header runner, etc. As far as adding horse power, that can be true under the right conditions. Runner length and diameter directly affect both horse power and torgue. I can't count the number of times I've seen headers or open exhaust on an engine show a decrease of either horse power, torque, or both because the diameters were too large, the lengths were too short, or too long, or a combination of both. Chances are you're going to want to run a longer pipe because your engine is a lower RPM engine, and torque is what you're after. Is your engine normally aspirated? Turbo charged? What's your cam lift? It's duration? Straight pipes can be good, under the right conditions. They can be just as bad if aren't tuned to the needs of the engine, which should be tuned to your needs. The answer to your question as posed is yes, no, and maybe. Mark
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