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235

08-15-2002 18:09:35




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I want to put bigger valves in my 620 and have a few questions. First what are the biggest valves I can put in it? And will I still be able to use it to work on the farm?
Thanks 235




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G-MAN

08-16-2002 10:52:15




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 Re: Need help in reply to 235, 08-15-2002 18:09:35  
I can't give you an answer on valve size, but I had a question. Are you planning on doing any port work to the head? If you simply install bigger valves and don't open up the ports, you may not see much of a gain, as valve size is matched to port size. You might be able to get as much of a flow improvement with a sufficiently large paper air filter, rather than the oil bath type, if you weren't planning on doing any other head, manifold or carb mods. There should be no reason you can't use it on the farm, providing all the work is properly done.

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235

08-16-2002 13:55:21




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 Re: Re: Need help in reply to G-MAN, 08-16-2002 10:52:15  
Ok say I would match the ports and put bigger valves in it, them would I see a difference? Does anyone know a good machinest to do this? Next Ive heard alot bout MSD ignitions, what do they do to help? Is this a pure puller feature or could it work on a plowin tractor too? Thanks 235



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G-MAN

08-16-2002 14:07:25




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 Re: Re: Re: Need help in reply to 235, 08-16-2002 13:55:21  
If you open up the ports some and put in bigger valves, you will definitely improve the airflow. Whether it would be enough of an improvement to make a big difference, all other things being equal, would probably have to be determined on a dyno. Any increase in airflow in and out of the engine will help produce more power. That's another consideration. When you're bringing more air in, you also need to get more air out, so you might consider some exhaust work, too. Steve Crum is the man to talk to on that subject, as he builds stainless intake and exhaust pipes for old tractors. The electronic ignition question is another "can of worms" type of question. For every guy that swears by electronics, you'll find a guy that will not give up his points. The MSD stands for "multiple spark discharge", which means that instead of one spark at ignition, there are many over several degrees of crank revolution, which can result in a more thorough fuel burn. I have installed electronic ignitions (Pertronix kits) in New Generation Deeres, and they make a world of difference in starting and the overall performance of the engine. They also eliminate all of the problems commonly seen with point-type ignitions. They truly are an improvement over the old systems. When's the last time you saw a new car with points? I see no reason why an MSD set-up would work fine on a tractor that sees daily use, as there are thousands of cars running around with these boxes under the hood. The only problem might be the constant pounding that tractors take doing field work. I don't know how well they'd hold up under these conditions. You might want to contact MSD and get their take on the subject. Good luck with your tractor.

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Thanks G-MAN

08-16-2002 15:03:54




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 Re: Re: Re: Re: Need help in reply to G-MAN, 08-16-2002 14:07:25  
nt



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