Cogsy Builds Rupnow Engine

[Brian Rupnow]

Cogsy--Out of the ten good men who stepped forward to build Rupnow Engines, I think yours was the next nearest to completion. Swifty's is done (and beautifully)--Gus's is done and I have seen videos of it running. Yours was, I think, the next nearest to completion. Many of my other builders have "faded away". I hope you are still making progress.---Brian

 

[gus]

That's what I thought when I built my Bonzer so I wimped out and used one of Jan Ridders' Vapour carbys. That got the engine running with minimum fuss.

Later on I tackled the complicated carby and found that it wasn't so hard after all.

So if you run out of time, try the vapour carb.

Jim

Hi Jim,

It's true most of us have Carbuphobia. Been trying out three versions------
Webster Original Carb,Webster OS .75 c.i. Carb,Brian's Carb(which I must have goofed/messed up converting to mm and the jet needle) and a bigger OS Carb which just won't match.
About to rework the Brian's Carb in Imperial Units and make a tool post grinder to grind needle.Another option would be beg/borrow/steal my wifey boss's big sewing needles
Fotos show two OS carbs.
The fuel line check valve works wonders. No more fuel dropping back to fuel tank and no air bubbles that can stop engine. Will incorporate check valve into all future engines. The Nemett Lynx IC Engine will have check valve.

Restarting engine was successful for every start. No more choking and flooding.

 

[Swifty]

Hi Gus, looks like you might have to ease back on the oil for the cylinder, black spots everywhere. I wonder if you used a thicker oil, that it might flow a bit slower.

How's the work on the governor going, and don't forget, if you want me to give you a drawing for the mitre gears, just let me know the number of teeth and mod number.

Paul

 

[gus]

Hi Gus, looks like you might have to ease back on the oil for the cylinder, black spots everywhere. I wonder if you used a thicker oil, that it might flow a bit slower.

How's the work on the governor going, and don't forget, if you want me to give you a drawing for the mitre gears, just let me know the number of teeth and mod number.

Paul

Hi Paul,

Please send mitre gear drawings. This beats reinventing the wheels.
Will add on 2T to the petrol. Cylinder Lube. is messy.
Next week will rework Brian's Carb. To get the H&M going ,best to use same Carb. This way we can compare notes.

 

[Swifty]

What module cutter are you going to use?
Don't want to hijack Cogsy's build, maybe you can send me a PM.

Paul.

 

[Cogsy]

I hope you are still making progress.---Brian

My apologies - I have been AWOL lately, both from the forum and the shed.

I have mated up most of the parts that I have, although I still have to mount the cam gear/cam assembly. I am guaranteed some shed time this weekend, although the outlook is not good after that for a while, so I should make some progress.

As it stands, I need to make the baseplate (shouldn't take long), make something up to hold my ignition bits, finish off my half made spark plug, then move on to the carby and check valve. I do have some compression already and I expect that will improve once the first couple of shots are fired and the rings and valves bed in a little.

I promise I'll have some photos to show by Sunday night, and if all goes exceedingly well, I may even have a running engine by then (but it's a very long shot).

Thanks for checking in.

 

[Cogsy]

As promised, I have a couple of photos at long last. I didn't get as much shed time as I hoped over the weekend, and I had a bit more to do than I thought, but progress has been made.

After several attempts at it, I have a spark plug which should work for an initial start (though I haven't tested it) but I'll need to make another that's a bit better proportioned, just for looks. The one in the photo isn't the new one, I forgot to put that in.

I also made an exhaust with a muffler/blast deflector of sorts, which looked really snazzy in my head, and it turned out horrible. Again, I'll use it to get the engine running then replace it with something that looks better.

The cam and gears are installed and working as they should, and I have the baseplate finished up good enough for now. I'm still not sure what the wooden base of the engine will be like, so I may end up rounding the corners or maybe chamfering the whole thing. I'll decide after I have a runner.

So I still have to mount the ignition and make up the carb. My plan says I'll get the ignition sorted during the week but the carb will have to wait until next weekend at least. I also need to make up something so I can spin the engine with an electric drill to get it started. I don't know what yet but I'll give it some thought.

Until next time - thanks for looking!

 

[Philjoe5]

Al,
That's a fine looking engine you've made. I'm sure you will work out the final details to get it running

Cheers,
Phil

 

[Brian Rupnow]

Cogsy--You are doing a wonderful job!!! I am sure you will soon have the fourth running "Rupnow Engine" in the word. You will become a member of a very elite club that so far has only 3 members. ---Brian

 

[Swifty]

Looking great Cogsy, yours will be the second water cooled version.

Paul.

 

[wagnmkr]

Looking Good ... looking forward to seeing it go.

Cheers,

Tom

 

[gus]

Great looking engine.You beat me hands down in finishing.The water jacket looks great too.

Gus is taking a week's break in Thailand 22----28 Oct. The hotel has good WiFi to follow up on your progress.

Fishing was very bad over the weekend. Nearly got caught in a flash flood. 77mm in 2 hours is just crazy.

 

[Cogsy]

No progress to report (again) but for a good reason for a change. I just received my new (to me) lathe on a very large bench, and my shed is now so full I can't step in the door. Now I need to dig out my engine crane to hoist my mill/drill onto the new bench, move my old lathe from it's position and shoehorn the new bench into place. Once all that's done I can move on to adjusting the new lathe and working out how to use it, then get back into engine building.

That all sounds easy, but being in the middle of a rebuild on the V8 turbo diesel in my furniture truck as well, I'm busier than a one legged man in an a$$ kicking contest...

 

[Path]

Al,

Thanks for the update. Looking back on your progress I see some great workmanship. It will be worth the wait. Looks like you will need to post a few pictures of your new lathe and workshop.

Pat H.

 

[Cogsy]

I got my mill/drill onto the new bench and managed to rearrange enough stuff to fit the new bench into position. As you'll see by the warts-and-all photos, I still need to do some major housekeeping to get everything into shape.

In the shortish term, I plan to build a further extension/lean-to off the side of the main shed to get rid of the motorbikes and some other storage type stuff. Soon I will be commencing work on the project car and I'll need all the room I can get for that.

Note to self - NO MORE PROJECTS!!!

Here's my little lathe, now relegated to just thread cutting and making pens.

Here's the new bench, with mill installed and the new lathe (I know, it's got a milling attachment, but I won't use it, I promise).

Now some pics of my 'work area'...

And finally, a stitched together, overall impression of what I'm dealing with.

My truck motor is now 100% back together, so now I've just got to put the 1 ton beast back in the truck. Once that's done, a tidy up in the shed and I'll be back on my engine.

 

[AussieJimG]

I feel much better now Cogsy, I was feeling a bit embarrassed by all the pristine work areas shown by other people.

Now I know that there are other blokes like me in the world.

Thanks

Jim

 

[gus]

There are occasions when one too many machining errrors happened/tools misplaced and hard to locate means it time to review housekeeping.Housekeeping is actually relaxing and it takes your mind away from tough machining job.

The current H&M Engine did suffered a few machining errors because of the rush and bad housekeeping.

 

[Cogsy]

Well I've finally started to make chips on my Rupnow engine again. I put the motor back in my truck, found I couldn't push the clutch in and ended up ripping it out again to fix that problem. It's back in now and running fine so now I just need some jobs to pay for the repairs.

I tidied up my shed just enough to move around in, then adjusted the lathe as best I could, although there's still some slop in the carriage gibs that I can't get rid of. It's usable but I'll have to investigate further.

As the new lathe is quite a bit different from my last one, I figured a small project to get the hang of it was in order. So I tried my hand at making my first ever wobbler. Frustratingly, the darned thing refuses to run and I've chucked it under the bench where I can't see it mocking me. In my defence, it is a tiny little 6mm bore x 10mm stroke and was supposed to run on steam. I'll rework it at some latter date.

So back to the engine. I have the fuel check valve mostly done, I just need to bore the holes for the locking pin and find a 1/8" ball and assemble it.

The carby is also nearly finished and ready for assembly, except for the slot in the needle adjuster knob. Brian - if you haven't given up on me and stopped reading my ramblings - what is the purpose of the slot? The only way I can see for me to make it would almost be considered butchery so if it's not vital I may omit it.

I will now make a very bold statement - Sometime this coming week I will be trying to get my engine to start!!!

Til then - thanks for reading.

 

[Brian Rupnow]

Cogsy--I haven't given up on any of my builders. The slot serves only one purpose.--When the engine is running, the needle valve will either try to vibrate one way and unscrew itself, or vibrate the other way and screw itself in farther. The slot lets you squeeze the sides in a little bit and "grip" the threaded part which it screws onto, to keep the needle from vibrating out of position.---Brian

 

[Cogsy]

Thanks Brian. That makes perfect sense. I'll do my best not to botch it.