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Tecumseh O H V 12 Hp?


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#16 MH81 ONLINE  

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Posted June 09, 2013 - 12:08 AM

How can that be? that a 14 hp OH140 would have the same bore and stroke as a 8hp??? I've never heard of such a thing with kohlers or cars?


I think he meant stroke, not bore/stroke.

The two different families have diff stroke, but they all have diff bore (except the 150/160 engine)
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#17 OkieGt OFFLINE  

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Posted June 09, 2013 - 12:34 AM

I think he meant stroke, not bore/stroke.

The two different families have diff stroke, but they all have diff bore (except the 150/160 engine)

I see, but the spec sheet I got over at Jacques cant be right where it list all engines as the same bore and strike, can it? I mean manuals have been wrong.



#18 MH81 ONLINE  

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Posted June 09, 2013 - 12:38 AM

I see, but the spec sheet I got over at Jacques cant be right where it list all engines as the same bore and strike, can it? I mean manuals have been wrong.


If they were all the same B&S, they would be the same displacement.

Different hp ratings can be gotten by using larger carb, diff valves, compression, head, etc... But only so much can be done, it is a finite range.

So, I would feel pretty safe in saying that the one showing them all the same is wrong. I'd say Doug's looks to be right.
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#19 TAHOE OFFLINE  

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Posted June 09, 2013 - 01:08 PM

 

Looks like a Sears 12/6 or 14/6 but the 12/6 had a Flat head hh120.

 

It may be a Roper.Roper was known to put different engines in they're machines.

 

Tecumseh did make the 12,14 and 16hp in both HH (flat head) and OH (Over Head Valve).

 

Specification           Model

Number Series      Number

 

120000                     HH120

160000                     HH & OH140
170000                     HH150 & 160
170000                     OH160
175000                     OH120

 

 

The HH 150 and 160 are both OH motors. Tecumseh changed them due to confusion, but they did not make a flathead 15 or 16. I've never seen a HH 140 either I think that was same issue and they were only OH motors.

Hopefully you all can open my attachment, shows specs between all the HP motors with piston strokes, etc.

 

Attached File  Tec specs.docx   270.6KB   38 downloads


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#20 OkieGt OFFLINE  

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Posted June 09, 2013 - 01:30 PM

Thanks Tahoe, just wonder why the OH150 and OH160 are the same in specs?



#21 EricFromPa OFFLINE  

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Posted June 09, 2013 - 02:21 PM

Couple of good manuals.

 

1st 1 is just a service and identification manual

2nd 1 is for 8-18hp cast iron Tecumseh Horizontal engines.

 

 

 

http://www.tecumsehp...Service/BSI.pdf

http://www.google.co....47534661,d.dmg

 

 

 

I want one of those OH18 engines but the ignition system scares the crap out of me.

 

I found a nice clean Sears 12/6 with a cab,blower,deck and blower up the road with a OH120 on it.I could get it pretty cheap but it needs ignition parts.No spark and a butchered wiring harness.


Edited by EricFromPa, June 09, 2013 - 02:34 PM.

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#22 DH1 OFFLINE  

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Posted June 09, 2013 - 03:55 PM

Thanks Tahoe, just wonder why the OH150 and OH160 are the same in specs?

 

OH150 and OH160 probably have different carb or exhaust to give different HP rating.

Or ??? the 15hp OH150 really is a 16hp engine that they rated at 15hp for marketing purposes.

 

HH80 and HH100 are the same bore/stroke, same displacement, again different carb or exhaust ???

One might be a detuned version of the other as I have found a restrictor plate in between the carb and block on 1 Tecumseh engine I took apart.

OH140 is the same bore/stroke as the HH80-HH100, the higher hp rating comes from overhead valve vs flat head.

 

I'd like to point out that a Honda or Honda clone, 13hp is a 389cc engine.

OH140 is a 14hp, 388cc engine, same displacement but has 1 more hp than the newer Honda type engine, done 40yrs ago.


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#23 TAHOE OFFLINE  

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Posted June 10, 2013 - 12:22 PM

 

 

 

I want one of those OH18 engines but the ignition system scares the crap out of me.

 

.

 

They use the same ignition as the other OH motors. There are plenty of modern day upgrades you can do, all run about the same at $150 and parts can be replaced with modern day off the shelf parts.


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