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WHAT INJECTORS TO USE

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arnie

02-10-2003 20:08:27




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What size injectors should i use on my 435. I am rebuilding it with N series pistons. Mostly going to show it, May hook on a sled at an antique pull, nothng serious. already went throught the trans and rear end.

Thanks




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will

02-11-2003 13:41:48




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 Re: WHAT INJECTORS TO USE in reply to arnie, 02-10-2003 20:08:27  
Arnie, I have seen that you hav'nt gotten any replies, so I will tell you what little I know. I know little or nothing about 435 JD, but I do know a little something about Detroit diesels. As far as your power question goes. The 53 series Detroits will handle a very large injector for short bursts of power, but for a farming application such as yours you would only want a # 55 injector or smaller. The reason being the long hard pulling of a disc or plow a larger injector will eventually result in burnt pistons and valves. 2 strokes do put off lower exhaust heat, but only to a certian point can it keep engine valves cool. The other problem with large injectors is to keep the engine block cool. It can and will overheat on long, hard pulls. A 3-53 Detroit with # 45 injectors has round about 85 horsepower at the fly wheel so 2/3 (2-53)of that is 56.6 horsepower. That estimate is somewhat high because it doesnt work quite that way. you will lose some simply because the 3cyl is smoother as it fires 1/3 times more often per round than a 2 cyl. To help you understand this better a 4-53 with # 45 injectors has round about 125 hp while the 3-53 with the same injectors only has 85. Because of the eveness the 4-53 has 31.25 hp per cyl while the 3-53 only has 28.3 per cyl. To anwser your question in short your engine will stand at least a # 50 or maybe even a #55 with out a lot of stress, but your worry will be in your drive train, as it was only built to withstand about 30 horspower which could be closer to 40 flywheel horsepower. Over powering could cause you more problems than it is worth. It is easy to put in bigger injectors, and just as easy to destroy you tractor with them. I am sorry for such a long post, but I wanted you to understand my reasoning.I hope this helps with your question.

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Johnny

02-12-2003 21:43:44




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 Re: Re: WHAT INJECTORS TO USE in reply to will, 02-11-2003 13:41:48  
Arnie, Will seen's to know alot about D/D and mayself over the years have worked on manyyyyy, This QUESTION GOE'S BACK TO WILL WITH THE LITTLE USE ARNIE WILL DO WITH HIS TRACTOR AND WHEN HE PULLING WHATEVER HOW ABOUT N65 I HAVE SEEN ALOT OF THEM IN 53 TYPE'S.



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will

02-13-2003 10:23:17




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 Re: Re: Re: WHAT INJECTORS TO USE in reply to Johnny, 02-12-2003 21:43:44  
I,m guessing that you are accustomed to working on trucks with detroits,as that is where most of the bigger injectors are used. I am more accustomed to the industrial applications where #45 or #50s are used. #65 injectors will be fine for his engine on short pulls, but possibly not as healthy for his running gear. The pull track is the worst possible place he could be simply because the track is very hard, and will only allow minimal slippage. If his engine was producing an estimated 40 flywheel horepower with #40 injectors it could produce more around the 60-65 horsepower range with a #65. John Deere engineers most likley didnt build his tractor heavy enough to deal with this kind of power increase. His engine will be fine as long as he never uses it for hard long labor. Its kind of like I said above it is easy to put in bigger injectors, and just as easy to destroy his tractor. The best advise I can give is to do whatever you do in moderation. Those detroits are great arent they.

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