OHH60 rod specs

[J.S.@SMS]

So, I tore down the Tecumseh today, which wasn’t as fun, or as painless as I thought it would be, but it got me out of the house. I don’t think that it’ll be a good base to start with. The cylinder has no sign of any cross hatching, and looks like the engine never had an air filter. I could hone the bore and replace the rings, but the rings are $55. Also there’s some scoring on the crank, both in the rod journal, and the, well I am not sure what to call it. It is the spot where there is a ball bearing on a Honda. Also the head gasket is iffy for performance, like the rest of the engine.

So I’m thinking that I’ll put it back together, with a slight head shave, and run it till it dies. Even though it still runs like a turd. Also I think that it’d be wiser to invest the money in one of my clones.

I did find a few surprises when I pulled it apart. Like the oil based tar in the bottom of the crankcase. And I completely forgot that I knocked down the sharp turn in the intake some. I am still thinking about adding some NOS.

PS: I’m sorry about posting long messages, I know that they can be hard to read, that is if you made it this far. Also I’m not usually up at 2am, but advil makes it hard for me to fall asleep

 

[JTSpeedDemon]

It's fine with the long messages.
'sid does it all the time!
We like details anyway.
And yes, please kill that Tecumseh by running it into the ground.

 

[J.S.@SMS]

A small update, I started re assembling the engine yesterday. The rings looked like they were in good condition so, against my better judgement, I honed the bore. Most of the scoring was removed, but there is still some, because I didn't want to take to much off. I would have liked to replace the rings, but they're half the price of a 212, and the engine is exactly 3 months older than I am. Then I cleaned the tar out of the crankcase. And I cleaned the carbon out of the head and piston. At this time it's back to a short block.

Also, the engine is about 2 months away from being 17, and from what I can tell, the PO never changed the oil. So it'll probably be a while before it blows with proper maintenance. Also I will be reducing the engines top speed some for some more longevity.

 

[J.S.@SMS]

Another small update. Apparently the date I had was wrong. The governor that was used was discontinued in august 1992. So either it is the wrong governor, or the engine is 10 years older than I thought.

 

[KartFab]

well, nitrous does require a pretty large ring gap anyway.... and with that $55 you saved by not buying rings....https://www.amazon.com/Nitrous-Oxide-Injection-racing-Bottles/dp/B01L4E1XGK

 

[J.S.@SMS]

I was thinking of something closer to this:
https://www.holley.com/products/nitrous/powersport_systems/parts/03001NOS

 

[65ShelbyClone]

There's also this smaller one without the fuel system parts.

https://www.holley.com/products/nitrous/hidden_systems/parts/05029NOS

 

[J.S.@SMS]

Thanks. Ill look into that system.

 

[KartFab]

for what its worth, when i was doing the con rod and flywheel information request, a lot of the broken conrods were from tecumseh engines. Notoriously weak conrods.

 

[txluke]

Another small update. Apparently the date I had was wrong. The governor that was used was discontinued in august 1992. So either it is the wrong governor, or the engine is 10 years older than I thought.

1992 seems like just a couple of years ago! My how the time flies.

 

[J.S.@SMS]

I don't even remember the 90s. But that kindof makes sense, being that I wasn't born until the early 2000s.

And I'm still working on reassembling the engine. I had to take a break for a few days because my shoulder started hurting.

 

[J.S.@SMS]

Fun fact, Remember how I was thinking of trying the flywheel off of a three horse on this engine. Well, it is a useless mod. I held up the 6.0 flywheel next to the 3.0 flywheel, and they're exactly the same.