Jump to content

Nominations for Tractor of the Month
Garden Tractors and Parts on eBay



Photo
- - - - -

Onan Djb 2Cyl Air Cooled Diesel For Repower... Thoughts?


  • Please log in to reply
19 replies to this topic

#1 twostep ONLINE  

twostep

    Rockstar

  • Senior Member
  • Contributor
  • Member No: 10198
  • 1,850 Thanks
  • 2,476 posts
  • Location: Berea, KY

Posted June 20, 2013 - 02:06 PM

Does anyone have any thoughts on using a 2 cylinder air cooled Onan DJB for a GT repower? Looks like they are 0.98 liter so that is pretty good size, specially for 2 cylinders. Seems like (due to low rpm) it would only be useful for hydraulic drive.

 

From what I've found, they are rated at 11.8hp and 0.6 gal/hr @ 1800rpm.

 

Any thoughts?


  • Texas Deere and Horse and JRJ have said thanks

#2 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted June 20, 2013 - 02:14 PM

Never heard of them!



#3 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted June 20, 2013 - 02:33 PM

What is the operating RPM's?



#4 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted June 20, 2013 - 02:37 PM

What is the operating RPM's?

 

Get your glasses on Brian, he said 1,800 rpm!  :smilewink:   The low rpm would be a snag.  Half normal of most any garden tractor, but if used in belt drive, no problem, just pulley down to double the shaft speed & you'd be good to go.  I can't say, but this engine "might" be able to run faster, but I have no way of knowing for sure.


  • Texas Deere and Horse said thank you

#5 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted June 20, 2013 - 02:51 PM

Thanks Daniel, I didn't fully read the last line. :wallbanging: :rolling:



#6 twostep ONLINE  

twostep

    Rockstar

  • Senior Member
  • Contributor
  • Member No: 10198
  • 1,850 Thanks
  • 2,476 posts
  • Location: Berea, KY

Posted June 20, 2013 - 02:59 PM

Here are a couple of links where I found info:

http://www.google.co...u9LHpAgq4Uf5ENQ

 

http://www.google.co...Ee2nmD6RneSxX_A

 

Looks like they are constant speed with either single speed or 2 speed governor. Operating speed is 1800rpm up to 2400rpm (power and fuel info is @ 1800).


  • Texas Deere and Horse said thank you

#7 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted June 20, 2013 - 03:05 PM

2,400 is a lot closer to where you need to be. What are you re-powering, is it direct drive or belt?



#8 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted June 20, 2013 - 03:11 PM

Thanks Daniel, I didn't fully read the last line. :wallbanging: :rolling:

 

I'm "usually" the world's worst at not reading entire posts before abusing my keyboard!   But not this time!  :D


  • Texas Deere and Horse said thank you

#9 twostep ONLINE  

twostep

    Rockstar

  • Senior Member
  • Contributor
  • Member No: 10198
  • 1,850 Thanks
  • 2,476 posts
  • Location: Berea, KY

Posted June 20, 2013 - 03:13 PM

Nothing yet... Actually I've been keeping my eyes open for a 2cyl kubota for repowering the 140 (packaging will be :wallbanging: if not impossible). I just happen to find one of these engines for a pretty good price.



#10 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted June 20, 2013 - 03:15 PM

Between the identical engines on my 430 vs 935, there is a 300rpm difference, making a 10% rise in HP.  If this held for this engine, then the 600rpm would convert to 20% rise, so 11.8 x 1.20 would = 14.6HP @ 2400rpm.


  • twostep said thank you

#11 Texas Deere and Horse OFFLINE  

Texas Deere and Horse

    RED Wild Hogs, Horses & Deeres

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 1435
  • 14,464 Thanks
  • 15,392 posts
  • Location: East of San Antonio Texas

Posted June 20, 2013 - 03:17 PM

Like Daniel said, If it is going to be belt driven, you can gain back the RPM's in the sheave ratio.



#12 olcowhand ONLINE  

olcowhand

    Red Tractor Nut & Diesel Addict

  • Staff Admin
  • Staff
  • -GTt Supporter-
  • Sponsor
  • Contributor
  • Member No: 20
  • 35,648 Thanks
  • 29,840 posts
  • Location: South Central Kentucky

Posted June 20, 2013 - 03:18 PM

Nothing yet... Actually I've been keeping my eyes open for a 2cyl kubota for repowering the 140 (packaging will be :wallbanging: if not impossible). I just happen to find one of these engines for a pretty good price.

 

Hey, I know it can be done!  Where there's a will, there IS a way! 


  • twostep said thank you

#13 JDBrian OFFLINE  

JDBrian

    Super Moderator

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2507
  • 9,574 Thanks
  • 14,136 posts
  • Location: Hubley, Nova Scotia - Canada

Posted June 20, 2013 - 07:51 PM

Sounds like it was a gen set engine. They have strange model numbers. 3 letters instead of a typical Onan model like P218 for instance.  The gas Onans designed for gen sets have a huge flywheel and a slightly lower compression ratio. I've got one in my garage right now. I thought it would be useful for a GT repower but I don't think it's worth all the trouble. I don't think I'd try to spin that big flywheel at 3000+ rpms. I'm not sure if the diesels could be sped up enough to run a hydro properly. You may be able to trade it or get a good price for it as they were used a lot in RVs. 


  • twostep said thank you

#14 skyrydr2 OFFLINE  

skyrydr2

    Tractorholic

  • Senior Member
  • -GTt Supporter-
  • Contributor
  • Member No: 5032
  • 3,413 Thanks
  • 3,163 posts
  • Location: Gardner, Massachusetts!

Posted June 21, 2013 - 03:49 AM

Ive seen them on military generators only! I think it was built specifically for these units. The ones I saw were vertical twins not opposed too. And were huge honkin' things that would be a real challenge to fit into a gt .
  • twostep said thank you

#15 JDBrian OFFLINE  

JDBrian

    Super Moderator

  • Super Moderator
  • Staff
  • -GTt Supporter-
  • Contributor
  • Member No: 2507
  • 9,574 Thanks
  • 14,136 posts
  • Location: Hubley, Nova Scotia - Canada

Posted June 21, 2013 - 05:04 AM

Ive seen them on military generators only! I think it was built specifically for these units. The ones I saw were vertical twins not opposed too. And were huge honkin' things that would be a real challenge to fit into a gt .

 

I've seen the opposed diesels for sale here on Kijiji. They are huge as well. No way the width could be kept inside the engine covers, even on a Ford or JD. I'm not sure what the crankshaft is like on them. If they were used with a single bearing gen head then it's going to have a tapered shaft. Would be a torque monster though!






Top