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Turbo charger

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BILL SMITH

10-09-2001 22:00:48




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I WAS WONDERING IF YOU CAN PUT A TURBO CHARGER
ON A JOHN DEERE 720 DIESEL.




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G Taylor

10-14-2001 13:03:39




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 Re: turbo charger in reply to BILL SMITH, 10-09-2001 22:00:48  
It will cost the same or $ less to purchase a 60's or 70's era Deere with more power than the 720/730. Than to get a 720 reliably turboed. For brief extra snort while pulling a 70/720730 with the large valve heads, Albert's dry filter conversion from Renaissance , straight stack & full fuel rack will make 70-75 HP at 1200rpm. As robust as the two cylinders are they still answer to the laws of physics. Engine & drivetain life will be exponentially reduced due to stress & heat. Significant loading or lugging down to less than rated rpm increases torque output & reduces component life.

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Bill

10-12-2001 05:15:51




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 Re: turbo charger in reply to BILL SMITH, 10-09-2001 22:00:48  
The best way to control the amount of boost is to use a waste-gate style turbo that is controlled by oil pressure, that way when the oil pressure drops when the rpm drops the boost pressure will drop,and u will be less likely to break the crank



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ToddF

10-12-2001 11:10:01




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 Re: Re: turbo charger in reply to Bill, 10-12-2001 05:15:51  
Why not use a wastegate that is controlled by boost pressure? That way regardless of what part of the torque curve the engine is in the boost pressure will be known to be within acceptable/capable limits. I may be completely wrong here because I have no first hand experience, but buy the time you are seeing a drop in oil pressure I suspect it is either too late or your engine has already survived the worst and the turbo is already losing boost pressure.

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PI

10-14-2001 11:05:31




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 Re: Re: Re: turbo charger in reply to ToddF, 10-12-2001 11:10:01  
Uneven exhaust impulses...a turbo needs a steady flow of exhaust to work properly, & a 2-cyl. engine does not put out such a flow. You would need something like a plenum chamber to even out the pulses, & that would create an unbelievable amount of turbo lag. I've heard of it being done, but I can't imagine it being too successful. The rod bearings, I suspect would be a weak point, also.



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Bill

10-12-2001 19:42:20




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 Re: Re: Re: turbo charger in reply to ToddF, 10-12-2001 11:10:01  
Running off boost pressure will work too but it might give you more boost at lower rpms than he wants == It all depends on the style of turbo. I do a fair bit of work on older highway tractors and Commins use oil pressure to control fuel delivery etc. that's why I was thinking oil pressure



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G Taylor

10-11-2001 01:17:19




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 Re: turbo charger in reply to BILL SMITH, 10-09-2001 22:00:48  
Tractor pulling, a spare time project or need more power in the field?



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Diesel

10-10-2001 07:29:10




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 Re: turbo charger in reply to BILL SMITH, 10-09-2001 22:00:48  
If you can make it fit on there,you can put a turbo on anything you want,as long as the engine can handle the added stress-(i.e. make sure you won't blow any gaskets,etc.)



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Denny Frisk

10-10-2001 13:20:56




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 Re: Re: turbo charger in reply to Diesel, 10-10-2001 07:29:10  
LOT of wasted space up in front of that engine, I would think fitting the turbo wouldn't be the big problem. The problem would be sizing the blower so You didn't get too much boost and blow the engine up. Lots of the R's broke crankshafts with their measely 45 HP. The center main bearing in the later tractors would help stiffen the crankshafts, but the turbo will really increase the power impulses if boost isn't closely controled. It must be hard to do because I've NEVER seen it done.

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ToddF

10-11-2001 08:34:15




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 Re: Re: Re: turbo charger in reply to Denny Frisk, 10-10-2001 13:20:56  
I've been wondering about this same question of adding a turbo to a two cylinder JD. Where does the crank break generally? It seems to me that the fly wheel is at the wrong end of the crankshaft. The crank has to transfer all the energy stored in the flywheel through the entire length to the clutch pulley drive end in addition to any energy added from the combustion process. If you moved the flywheel to the clutch pulley end would the crank shaft hold up any better? I'm starting to get off the subject, really my question is where does the crank generally break? Has anybody seen this happen enough times to know?

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