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<blockquote data-quote="billstoy" data-source="post: 393441" data-attributes="member: 3156"><p>it's good that someone took a lot of time to write this. It's wrong, this also depends on the cam overlap. high over lap cam can help pull gasses as explained but only at high rpm "flow"</p><p>low rpm will cause lower cylinder pressures" lower Compression" lower low end. I can give a easy example a stock Toyota 22r needs backpressure. try it with no muffler you will loose 25% of your hp. but I changed to a lower overlap cam, I hope back pressure is not needed so much.. This also will allow for higher cylinder pressures at low rpm and is a must for turbo and supercharger applications . who ever rote this is very closed minded. must only work on one kind of motor in only one configuration. There are just to many variables to make such a blanket statement. every motor design and use is different. This is why there is so many parts to choose from and people dyno testing every one.</p><p>no offence Pumpkin as stated you got this from another site.</p></blockquote><p></p>
[QUOTE="billstoy, post: 393441, member: 3156"] it's good that someone took a lot of time to write this. It's wrong, this also depends on the cam overlap. high over lap cam can help pull gasses as explained but only at high rpm "flow" low rpm will cause lower cylinder pressures" lower Compression" lower low end. I can give a easy example a stock Toyota 22r needs backpressure. try it with no muffler you will loose 25% of your hp. but I changed to a lower overlap cam, I hope back pressure is not needed so much.. This also will allow for higher cylinder pressures at low rpm and is a must for turbo and supercharger applications . who ever rote this is very closed minded. must only work on one kind of motor in only one configuration. There are just to many variables to make such a blanket statement. every motor design and use is different. This is why there is so many parts to choose from and people dyno testing every one. no offence Pumpkin as stated you got this from another site. [/QUOTE]
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