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John Deere Tractors Discussion Forum
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JD two cylinder with a turbocharcher: is it possib

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Johnthelen

01-21-2006 19:39:26




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The past couple of days I have been searching the internet for information about turbocharching a JD two cylinder. I found several discussions about turbocharching/supercharching and rumors that people in past started building a supercharched 830.

Maybe I can find the answer on this forum.

Thnaks, John




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buickanddeere

01-22-2006 07:07:15




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 JD two cylinder turbocharcher: anything is po$$i in reply to Johnthelen, 01-21-2006 19:39:26  
A turbo diesel will work fine with a properly sized and designed system. There is enough inertia in the turbine wheels and shaft along with plenum volume to work around pulsation concerns. Where the trouble occurs is when some tinkerer who can�t spell fluid dynamics let alone understands the basics. They go and weld on a turbo from a 4620 and wonders why the 830 doesn't make a 4620's HP. Compression ratio, injection time/pressure, exhaust/intake pressure and cam timing are vital to success. A turbo gasser two cylinder is more difficult due to detonation and octane requirements of a large open chamber. A throttle blade in the middle of things doesn't help either.

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BushogPapa

01-22-2006 05:34:34




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-21-2006 19:39:26  
Forget Turbocharging a JD 2-Cylinder the turbo won't Spool up with the uneven exhaust pulses...

Go with a Supercharger...it could even be driven off the clutchdrum... You will need a LARGE Plenum chamber too...

Ron.



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barnrat

01-22-2006 04:35:01




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-21-2006 19:39:26  
There is a lot more power to be found in those old 2 bangers before I'd think about pulling out my hair over a turbocharger or superchager. Just ask some of these guys that build these pullers how to get more ponies. Or better yet get your favorite 2 cylinder turning bout 3000 rpms, you won't be worried about no silly charger. I've seen an 830 setup that way, goes down the track like a super modified pulling tractor.

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Johnthelen

01-22-2006 10:13:19




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 Re: JD two cylinder with a turbocharcher: is it po in reply to barnrat, 01-22-2006 04:35:01  

I am aiming at max. 2700 rpm. Do you have some more info on that tractor or who does it belong to?

Thanks, John



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barnrat

01-22-2006 11:16:47




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-22-2006 10:13:19  
It was bout 10 years ago when I was 19. I had just gotten my 830 and was impressed by the display on the track. I tried to talk to the guys to find out how they did it, but they wern't interested in giving away any secrets. Not being to much interested in pulling 2 cylinders I didn't press the issue.



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It will explode

01-22-2006 05:50:20




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 Re: JD two cylinder with a turbocharcher: is it po in reply to barnrat, 01-22-2006 04:35:01  
Please, please,please don't be telling some poor uneducated, unknowing young man to "get your favorite 2 cylinder turning bout 3000 rpms". Do you know that you will most likely be the cause of his death. You were correct when you said, "you won't be worried about no silly charger". DO THE MATH. A standard JD cast flywheel will most likley explode at that rpm range.



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buickanddeere

01-22-2006 07:10:02




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 Re: JD two cylinder with a turbocharcher: is it po in reply to It will explode, 01-22-2006 05:50:20  
Centrifical force increases only 5.76 times when going from 1250 rpm to 3000rpm. What could possibly go wrong?



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barnrat

01-22-2006 07:49:27




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 Re: JD two cylinder with a turbocharcher: is it po in reply to buickanddeere, 01-22-2006 07:10:02  
Hey it wasn't my tractor! Just like most modified tractors I'm sure it wasn't turned up to promote engine longevity. I don't have my 830 anymore, but I'm still content to hear the old bang bang of my 50 or my 730D doing regular farm work.



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WeirdDeere

01-22-2006 02:07:29




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-21-2006 19:39:26  
Regarding the uneven firing pulses and problems with turbocharging evenly....

Why not a separate turbo or supercharger for each cylinder? Sure it would be complicated, but adding a turbo/supercharger would take a bit of work in the first place!

When you start it up the first time, let me know! So I can hide in a bunker. Ha ha.

Brandon

My Industrial John Deere website
John Deere Diesels
The LaGrange Engine Club

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B-maniac

01-21-2006 20:09:15




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-21-2006 19:39:26  
Since a JD 2cyl. fires on #1 turns 180 degrees then fires #2 then turns 540 degrees before it fires again then it only stands to reason that all the other strokes including the exhaust stroke will also have that 540 degree gap. Since exhaust pressure and heat from the exhaust stroke is what turns the turbo then out of 720 degrees of crank rotation (4 strokes @ 180 degrees each)there will be 540 degrees where there will be no exhaust pressure on the turbo. I dont believe it would be very productive. Now a supercharger would because it would be driven presumably off the flywheel and would hold a preset boost pressure on the manifold at all times.Personally I think nitros would be the way to go, the bottle could easily be hidden and the selenoid linked to the throttle lever for preset actuation RPM.

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John T

01-21-2006 19:55:36




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 Re: JD two cylinder with a turbocharcher: is it po in reply to Johnthelen, 01-21-2006 19:39:26  
John, Ive read about it in the past also, but as I recall those infrequent unsteady pulses from ONLY TWO CYLINDERS isnt as good at turbocharging as the much closer and more even and constant pressures from a 4 or better yet a 6 cylinder engine. Lets hear what the guys say who have built or used them??? Good question !!!

John T



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Johnthelen

01-21-2006 20:33:31




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 Re: JD two cylinder with a turbocharcher: is it po in reply to John T, 01-21-2006 19:55:36  
To reduce the pulses you could design a airbox that equalizes the pulses a bit (they mentioned that in former posts, another thing would be to increase the rpm.

Thanks, John



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