Re: Let's get the facts straight about straight pi

Posted by Joe Evans--Old Oak Farmal on May 03, 2004 at 03:34:15 from (209.41.235.205):

In Reply to: Let's get the facts straight about straight pipes! posted by Farmallkid on May 01, 2004 at 07:42:08:

I was away from the 'puter for a couple days. Logged on to our site and saw 60 hits for May 2. Usually something's up on YT to generate that many hits. Came here, and now I see why. Thanks for using us as reference. Some facts and perceptions about the W-9 need squared away, however.

When we bought the W-9 last August, it just happened to have been fitted with a straight pipe. We didn't do this to enhance performance or anything else. Don't know in the least if a straight pipe adds or detract performance. We don't pull the W-9 regularly. We haven't had it that long and are still finding out some things about it.

As far as I am concerned, noise does not equal performance. The 3" stack on the W-9 DOES attract attention--the other Clubbers know we've arrived when the W-9 is barking at everyone. That sucker is loud, but a little bit of that noise gets real old real fast IMO. Had the opportunity to do some plowing with the W-9 two weeks ago. After a couple of rounds with the plows, I pulled them out of the ground and headed for my truck to get some ear plugs. Fortunately (unfortunately?) I was called to other duty when at the truck--the Plow Days host needed some corn stalks sliced up, so I used the 460 (has a muffler) and disk for the remainder of the day.

I do not recommend prolonged operation of a W-9 with a straight pipe without hearing protection. For short periods it's OK. I am seriously considering finding the proper muffler for it.

Will it damage the engine? Probably not if the time is taken to let the engine temps normalize after hard running. A very well-respected engine/racer wonk who I work with told me that a straight pipe allows cool air to come in contact with the exhaust valves--there is less metal to heat the incoming air than there is with a muffler. With trailing throttle and when you've throttled down with load behind you, the W-9 will burp and back fire slightly. This is fresh, O2 laden air igniting minute amounts of the unburned charge at the exhaust valves he tells me.

Will a straight pipe enhance performance? Maybe. The seller of the W-9 had several other tractors at this auction, some had been modified for pulling. This seller was indeed a puller. The W-9 appeared to be untouched for pulling, but later inspection revealed the rear lugs had been cut. Other things suggest that engine performance had been enhanced by this seller. Some peeling block paint revealed odd-colored primer indicating the engine had been reworked. We used the W-9 to tow my disk home, and following my brother on the W-9, I clocked him on a slight down hill grade at 20 MPH. Maybe the governor has been diddled with. Also, the W-9 appears to be a very strong performer on our Baker Test Fan--much stronger than what you would expect from a 50 BHP tractor. So, to sum up, perhaps the straight pipe is a piece of the pie with respect to bumping up the engine's pulling performance. Again, don't know.

Get yourself a straight pipe. They do sound cool! Just don't use it for long periods--just call it your "play pipe".

Joe Evans Old Oak Farmalls

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