Re: Re: Re: Muffler back pressure question

Posted by Steve - IN on June 25, 2003 at 21:17:22 from (12.223.205.149):

In Reply to: Re: Re: Muffler back pressure question posted by KX on June 25, 2003 at 08:31:26:

KX,
You're welcome.
The guys who designed your stock engine did all the worrying for you. Generally within the bounds of time, technology, and costs - they got it right. The proof of that is that there are so many guys with old tractor engines still running.

The thing to remember when you start modifying is that one thing usually calls for another. For example, if you rigged up some whiz bang ultra efficient exhaust system for your tractor (and didn't touch the head, cam, intake side) you could have a setup where - at up to 3/4 throttle - the exhaust scavenging was pulling lots of fresh fuel air mixture right through and out the exhaust. You'd have a big fuel guzzler that was only happy wide open, and not too practical for daily chores around the farm.

We used to build up 4 cyl. blocks that left the foundry thinkin' they'd live in some nice little econo-box car, and we'd throw DOHC heads on them with Weber carbs and light rods, pistons, dykes rings, etc. with loose clearances all around then give them 180mph thrill rides with 2G turns. Fun stuff, but I also respect the fact that my >50 yr. old tractors can make huge amounts of torque at barely turning over RPM levels. By comparison a race engines would gurggle and sputter until it got to 3500 RPM.

Have fun with your shade tree wrench turning.

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