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 Rpms on onan

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Lawren Wimberly
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Kleatus
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PostSubject: Rpms on onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 4:50 pm

Does anybody know how to increase rpms on a B48m onan
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 5:29 pm

Should have an adjustment on the throttle linkages somewhere. I wouldnt mess with the Onan too much, if something blows replacement parts are $$$$$$$$$$
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Lawren Wimberly
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 5:41 pm

3600 rpm max for an opposed onan... they are extremely strong and built to lug (torque rather than high rpm HP)  the 18 hp onan actally producrs about 26 hp at 3600 rpm

they were designed to be run continuously at 1800 rpm, and HP was rated at that rpm

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MightyRaze
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 7:30 pm

I agree with what is said, also my Onan if rev'ed too high will vibrate pretty bad. If speed is what you want, I'd look into pulley sizes.

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PostSubject: Rpms for onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 8:23 pm

No it's for a pulling tractor the class it will pulling in is the 16-18 stock modified
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PostSubject: Rpm for onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 8:24 pm

So where will it produce the most horepower
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PostSubject: Rpm for onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 8:27 pm

I was only gonna rev it at about 4000 rpm is that to much
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeMon Mar 13, 2017 8:38 pm

Are Onan engines pressure lubricated? If not I wouldn't wanna rev it too high without any oil mods.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
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      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


  - Allis B-110 x2, 710 & 716 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic & 1668 - Cub 106 & 124 - Ford LGT 125 & 145 - White 1650 Yard Boss
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PostSubject: Rpms for onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 9:07 am

It doesnt have a oil filter so I don't think it is pressure lubricated I might just run it at 3600
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 11:45 am

@AllisKidD21 wrote:
Are Onan engines pressure lubricated? If not I wouldn't wanna rev it too high without any oil mods.

The 2 I happen to have are. Rpms on onan 2240318088

Rpms on onan 316508e59b08223ed200cf3a8243a321

Who knows what the competitor engine was...
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Kleatus
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PostSubject: Coil for onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 5:42 pm

A Kohler magnum
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 6:34 pm

@Kleatus wrote:
It doesnt have a oil filter so I don't think it is pressure lubricated I might just run it at 3600

Yeah I wouldn't risk it with that ol' engine, if you are looking for high RPMS I'd go for a Briggs single. Unless it has to be horizontal shaft.

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


  - Allis B-110 x2, 710 & 716 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic & 1668 - Cub 106 & 124 - Ford LGT 125 & 145 - White 1650 Yard Boss
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 6:38 pm

@AllisKidD21 wrote:
@Kleatus wrote:
It doesnt have a oil filter so I don't think it is pressure lubricated I might just run it at 3600

Yeah I wouldn't risk it with that ol' engine, if you are looking for high RPMS I'd go for a Briggs single. Unless it has to be horizontal shaft.

Briggs single for vertical, or a Honda GX series for horizontal. Both of which are way easier to find parts for if you mess something up, but will never produce the torque that the Onan does
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AllisKidD21
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 7:37 pm

Yeah Onans are work horses, pretty good for garden tractors and stuff. Also like CQ said, parts for Honda and Briggs engines are way easier to find and cheaper. As opposed to Onan parts, which can break you haha!

_______________________________________________
"This'll either wake you up or put you to sleep forever!"- Red Green         "Whatever you do you should do right, even if it's something wrong." - Hank Hill
     
      - MTD Off-Road Build
      - Ford LT 110 Off-Road Build
      - Craftsman GT 6000 Off-Road Build
       - Sears LT11 Rat Rod Build *2019 Build-Off Winner!*


  - Allis B-110 x2, 710 & 716 - Wheel Horse 655, 953 & 500 Special - Case 444 - Bolens Versamatic & 1668 - Cub 106 & 124 - Ford LGT 125 & 145 - White 1650 Yard Boss
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Lawren Wimberly
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeTue Mar 14, 2017 9:56 pm

@Kleatus wrote:
So where will it produce the most horepower

3600... hp drops off about that point... carb and exhaust limit high rpm, as does the valve spring pressures (valves start to float)

_______________________________________________
I can do anything I set my mind to... the impossible just takes me a little longer   Rpms on onan 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 10:54 am

@Kleatus wrote:
It doesnt have a oil filter so I don't think it is pressure lubricated I might just run it at 3600
My welder with a CCK doesn't have an oil filter but it is pressure lubed
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Lawren Wimberly
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 11:07 am

it is pressure lubed... it has an oil pump... at least my 1969 version does

if it IS a B48m, it has an oil filter... it may be internal, on the pick up tube screen, but it should be there... the oil pump is like a vw pump... two gears that rotate and squeeze the oil between them creating the oil pressure.

http://www.searspartsdirect.com/model-number/b48gga0183475a/0776/1503500.html

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I can do anything I set my mind to... the impossible just takes me a little longer   Rpms on onan 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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Kleatus
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PostSubject: Rpms for onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 12:00 pm

Can't use Briggs cause it has to be horizontal and Hondas just wouldn't be a good torque motor but if I run the onan at 3600rpm it should be fine right and what kind of weight oil should I put in it I'm gonna put royal purple or Lucas in it
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 12:12 pm

I think you want to run conventional dino oil. The synthetic eats away at the gaskets of older engines. That's what I've read anyway. For weight, I would just run normal SAE 30
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Lawren Wimberly
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 12:18 pm

@Kleatus wrote:
Can't use Briggs cause it has to be horizontal and Hondas just wouldn't be a good torque motor but if I run the onan at 3600rpm it should be fine right and what kind of weight oil should I put in it I'm gonna put royal purple or Lucas in it
10w30 is what it was designed for... just like a car... as for additives, slick 50 (half a bottle) will help keep things cool


for pulling, the onan's torque is gonna help you more than the high rpm's horsepower... max torque is in the 25 to 2600 rpm range

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I can do anything I set my mind to... the impossible just takes me a little longer   Rpms on onan 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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Kleatus
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PostSubject: Rpms for onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 8:10 pm

It doesn't really matter because it's got a little oil leak coming from the oil pan or the front bearing cup which I just lapped the valve decarboned the piston and valve shaved the eyebrows a little set the valve lash and replaced the front seal in the bearing holder and replaced the gasket on the front bearing holder so 10w30 oil will be good for high temps
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 8:44 pm

Do these old, (well atleast in my case... ) engines need a zinc additive? We have some old v8s that without the zinc the cam will eat itself... I dont believe oil is the same as it was 40 years ago.
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PostSubject: Rpms for onan   Rpms on onan Icon_minitimeWed Mar 15, 2017 8:46 pm

Royal purple and Lucas have lots of zinc to prevent from engine wear and the metal from breaking down
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Lawren Wimberly
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeThu Mar 16, 2017 8:58 pm

@Kleatus wrote:
Royal purple and Lucas have lots of zinc to prevent from engine wear and the metal from breaking down


slick 50 uses PTFE (Teflon).... it will run for quite a while WITHOUT oil.... don't use it on engines that are not broken in

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I can do anything I set my mind to... the impossible just takes me a little longer   Rpms on onan 1222323911

Tech Manual mod, If ya need it, and cant find it... Just ask.... Pm if I'm not on line
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PostSubject: Re: Rpms on onan   Rpms on onan Icon_minitimeThu Mar 16, 2017 10:38 pm

Good info to know.

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Modified Tractors:
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Kal-El 82 Murray GT
TheGreenMachine - "coming 2022"
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