The muffler is there to quiet the engine and is a restriction, and restrictions limit HP,, period. The reason a short pipe might make more HP than no pipe is not back pressure but quite the opposite. Exhaust out of an engine is not steady flow but pulses and a pipe of the correct diameter and length will take advantage of the pulses timing them to provide a scavenging effect that lowers pressure the port. I have never seen any evidence of valve warping from short pipes as a matter of fact I once ground an exhaust valve true and repeatedly heated it red hot and let it cool in open air and it never warped. It didnt even warp when I threw water on it, I call that one BS too. Racers are the biggest bunch of monkey see monkey do types you will ever run across and I dont doubt that some of themc over headers thinking they are preventing valve warpage. However the original reason for covers on dragsters with zoomie headers was to keep the hot sticky tires from picking up gravel and debri and pitching it in the headers when they were being towed back the return road. They also keep things out of the headers that others might throw in there AND they provide protection for the body when working over them.
Upload one or more videos to your post. Photo filesizes should be less than 300K and Videos, less than 2MB. Formats allowed are gif, jpg, png, ogg, mp4, mov, and avi. Be sure to use filenames without spaces or special characters, and filetypes of 3 digits lower case.
We sell tractor parts! We have the parts you need to repair your tractor - the right parts. Our low prices and years of research make us your best choice when you need parts. Shop Online Today. [ About Us ]
Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
... [Read Article]
Latest Ad:
1964 I-H 140 tractor with cultivators and sidedresser. Starts and runs good. Asking 2650. CALL RON AT 502-319-1952
[More Ads]
All Rights Reserved. Reproduction of any part of this website, including design and content, without written permission is strictly prohibited. Trade Marks and Trade Names contained and used in this Website are those of others, and are used in this Website in a descriptive sense to refer to the products of others. Use of this Web site constitutes acceptance of our User Agreement and Privacy Policy
TRADEMARK DISCLAIMER: Tradenames and Trademarks referred to within Yesterday's Tractor Co. products and within the Yesterday's Tractor Co. websites are the property of their respective trademark holders. None of these trademark holders are affiliated with Yesterday's Tractor Co., our products, or our website nor are we sponsored by them. John Deere and its logos are the registered trademarks of the John Deere Corporation. Agco, Agco Allis, White, Massey Ferguson and their logos are the registered trademarks of AGCO Corporation. Case, Case-IH, Farmall, International Harvester, New Holland and their logos are registered trademarks of CNH Global N.V.
