Help with engine

[Miky]

So I found another engine on the junkyard, it's 8hp flathead. Only paid 5 bucks when you convert. It works great but problem is it is running counter clockwise. It has open pull rope ignition sistem
At first I wanted karting but with this engine it Is maybe better to go with go kart.
What do you guys think?


Yeah that is a fire extinguisher, that is going to be fuel tank, one more thing, the engine is very heavy. If I'm going to build a kart I need to put the engine on the opposite side then normal because of counter clockwise rotation

 

[Poboy kartman]

WAIT! WHAT? It looks to me like you wind the starter rope on clockwise on the starter pulley....which would make it run clockwise.....unless clocks run a different direction in Croatia.....Or am I seeing that pulley wrong?

 

[Miky]

You are seeing it wrong, engine is running counter clockwise, for sure

 

[machinist@large]

WAIT! WHAT? It looks to me like you wind the starter rope on clockwise on the starter pulley....which would make it run clockwise.....unless clocks run a different direction in Croatia.....Or am I seeing that pulley wrong?

You are seeing it wrong, engine is running counter clockwise, for sure

He right Doug; when I zoom in on the rope cup, it's designed for a CCW pull as seen from the flywheel end, which would give it a CW rotation at the output end of the crank shaft.

Miky, the rotation direction isn't a deal breaker, so if you plan on using it, it'll just require a bit more creativity on your part. It also sound's like you're putting some serious thought into how to get there, which make's me think that you'll get it to work...

I'm waiting to see how this works out......

 

[Miky]

Maybe this is better because clutch or jackshaft is going to be away from me but the rope cup is going to be next to me. I don't like that so I started thinking about

but problem is all rope pull thing (I don't know how it's called) are for clockwise rotation

 

[OzFab]

I see the issue; it's not that the internals are any different, it's the externals that are different, the crank is reversed from what we're used to seeing...

In most cases, the starter is on the right side of the engine & the PTO is on the left; this engine is reversed...

The simplest way to make it work on a kart is to reverse it but, that will mean the carb & exhaust will be next to the seat...

Another option is to incorporate a FNR gearbox...

As for the pull starter, IMO, OEM would be the best solution...

 

[Miky]

So I adjusted the valves but I am facing another problem, when I give full throttle the engine stalls, sometimes it shuts off. Maybe carb problem and the valves are overlapping somewhere around T.D.C.

 

[Miky]

Anyone? What is the size of piston pin on Predator 212?

 

[OzFab]

So I adjusted the valves but I am facing another problem, when I give full throttle the engine stalls, sometimes it shuts off.

That sounds like a carb issue to me; remove & thoroughly clean the carb...

Maybe carb problem and the valves are overlapping somewhere around T.D.C.

Is that one or two separate points?

The valves are meant to overlap at TDC between the exhaust & intake strokes...

Anyone? What is the size of piston pin on Predator 212?

Asking a new question is fine but, "bumping" a thread (posting just to bring it to the top of the list) within 24 hours is considered rude & impatient

 

[Miky]

Sorry about free bump, carb vas already cleaned and yes the valves are overlapping around intake stroke.
Here is a video of the engine now, I had a bad spark plug, the spark was wery poor,now it's a new spark plug.

https://www.youtube.com/watch?v=7Yo1UV9IXYs

 

[machinist@large]

That sound's pretty good. I'm glad it was something simple to get it running, and since it wasn't smoking like a two stroke, I'm guessing that the internals are OK.....

 

[OzFab]

Well, I'm glad you solved the issue, despite my, seemingly, bad advice Without hearing the engine, it could've gone either way...

 

[Miky]

Thanks guys for your help. Engine had a bad piston pin and I couldn't find the right one because the firm that build this engine isn't working in a long long time so I went to the machinist to make a piston pin. I'm worried it will brake, it's made from a car axle. Maybe piston pin from Predator 212 is the same or near size. Size from this one is 17mmx65mm.

 

[mckutzy]

No that won't break, or at least not from use on that motor.....

 

[Miky]

That engine is going on a karting, it will be high rev'd

 

[OzFab]

It should be fine...

 

[Miky]

New air box

 

[NewbCarter]

Alcohol / Water injection :O