Cogsy Builds Rupnow Engine

[gus]

All of us are graciously and anxiously waiting for the birth of the H&M baby.

Gus now on holiday with darling boss in South Thailand. No worry .Cheap Air fare and cheap hotels and cheap but good seafood.
Nellie having a great time shopping.

 

[Path]

Nellie having a great time shopping.

That may not be cheap!

Have a great time ... looking forward to your return!

Pat H

 

[Brian Rupnow]

Cogsy--What's up Doc?? Any progress??

 

[Cogsy]

Brian - I have a tale of woe but I'll spare you and just say that I jinxed myself and haven't set foot in the shed at all since my last post. However, after tomorrow I have a forced 8 day hiatus that should let me get back to work on my engine. Fingers crossed but lesson well learned - no more promises!

 

[gus]

Brian - I have a tale of woe but I'll spare you and just say that I jinxed myself and haven't set foot in the shed at all since my last post. However, after tomorrow I have a forced 8 day hiatus that should let me get back to work on my engine. Fingers crossed but lesson well learned - no more promises!

Hi Cogsy,

Take it easy. Christmas around the corner.

Gus too struggling with the H&M mechanism.:wall:

 

[Brian Rupnow]

Cogsy--What's happening brother?? This year has almost got away on us. We are still waiting with great anticipation to see the worlds 4th running 'Rupnow Engine". Hope all is well with you.---Brian Rupnow

 

[Cogsy]

I have made progress, slowly, between stupid self-inflicted injuries. Yesterday I got the ignition sorted to the point it will spark when required and now I only have to make a head gasket and assemble the engine.

Today is forecast to be 41 degrees celsius in the shade, so it will be quite late in the day before I can get into the uninsulated tin shed. I will make it though, and I'll attempt to get it fired up either tonight or tomorrow.

So, my next post will either be - "It's running!" or "%$^#&*@ - I QUIT!!!!". We'll see...

 

[Philjoe5]

Too much invested to quit...just keep at it, 'cause that's all it takes. From someone who's been there

Cheers,
Phil

 

[rcfreak177]

I have made progress, slowly, between stupid self-inflicted injuries. Yesterday I got the ignition sorted to the point it will spark when required and now I only have to make a head gasket and assemble the engine.

Today is forecast to be 41 degrees celsius in the shade, so it will be quite late in the day before I can get into the uninsulated tin shed. I will make it though, and I'll attempt to get it fired up either tonight or tomorrow.

So, my next post will either be - "It's running!" or "%$^#&*@ - I QUIT!!!!". We'll see...

Yes Very hot here in Kelmscott too. measuring 43C or 104.9 degrees farenheight in my yard

Fingers are crossed for you on getting the engine running mate. Can't wait to hear it.
Good luck.

Baz.

 

[Brian Rupnow]

Send some of that heat my way guys. Its -10 F here, colder than a witches tit, with 8" of snow on the ground!!! I've had pneumonia for the last 3 weeks so haven't been doing much of anything in my shop. ---Brian

 

[gus]

Done 39 C in NW India .No fun.The hot Indian Curries helped.

Done 41 C in Yangzhou,China ,was sick for a few days. Spent my holiday in the hotel room with
aircon at full blast. Done -5 C in Nanjing,was nice and comfortable in Winter Wear.

Give me back good old Singapore, 28-----31 C with the rain and RH at 85---90.If it gets worse,I can run to the shopping complexes to cool off.


Hi Cogsy. Hang on there and the "worst will be over".Came from Tales of Two Cities.

 

[Cogsy]

So it's still not running, but I'm not quite ready to quit yet.

I did manage to get a couple of pops out of it, but not consistently and then I destroyed my hall sensor with a series of high speed impacts with the trigger magnet. In the car, $20 worth of fuel and $11 for a couple of sensors only to find they either don't suit my ignition or they're just faulty. I've now cobbled together a points setup to trigger the CDI and that seems to be working fine. I'm happier that it doesn't have any advance built in so I can dial the timing in better now.

Now I know I have a small leak on my intake valve and my head gasket material is a little too thick, so there is a small leak there as well. I'm also not convinced my piston rings are 'round' enough. So, the plan is now, in order : Seal the head gasket properly and re-try, if no success make new rings using a different method, if no success make new piston using an O-ring instead, if no success re-lap the valves, if no success build a model boat and use engine as anchor...

So off I go to the shed again.

 

[Brian Rupnow]

Cogsy--Been there--Done that!!! I had hair before I started building model i.c. engines.---Brian

 

[gus]

Hi Cogsy,

You are almost there. A few pops means you are near the finishing line.

My confession>
Day one. Spent a whole day fiddling around and only get pops.
Day two. Got her running.
Day three .Lost her.

H&M.

I promise will get H&M going after Christmas.
Day four. Got her running smoothly.

 

[Swifty]

Hi Cogsy,

I would be doing the easy things first before remaking anything. Repair the head gasket, lap the valves, then if it still won't start you will have to work on the rings or modify the piston to take an O ring instead.

When I tried my initial run, I used my battery drill to crank it over. It soon enough started to fire, bedding the valves in that little bit more, it was off and running after that. Just check that the fuel is OK as well, I find that I only need a quarter turn of the needle from fully off in hit and miss mode, if I hold the governor down to stop it working, I get more speed out of the motor when I lean the fuel off a bit more..

Paul.

 

[Cogsy]

Thanks guys. I sealed up the head gasket, which made my intake valve leak worse, and I checked the rings which seem fine. So I lapped, tested, lapped, tested, repeat for quite a while with no joy. then made a new intake valve with a tighter fit on the shaft, lapped it repeatedly, no joy. Then I had an ah-ha moment when I discovered a very small leak down the side of the intake valve cage (I couldn't fit my head in it so I'm calling it small). Removed the cage, made a new one, installed it, lapped the valve and my compression has improved dramatically, although there is still a small leak on the gosh-darned intake valve!

I can get it to repeatedly fire when I choke it with my finger over the carby and then release, but still no running. I'm going to keep trying this for a while this morning, in the hope that the valve will seat itself, if it doesn't I guess I'll relap the valve, just for a change.

Can anybody point me in the direction of model boat plans??

 

[Swifty]

Cogsy, what are you using for a fuel tank? Is it sealed up not allowing air to get in. I built my tank filler cap with an air bleed screw in it, but I must remember to open the vent screw to allow the fuel to be sucked up, once I was showing someone the engine and it wouldn't run, then realised that the vent screw was shut.

Paul.

 

[Brian Rupnow]

Cogsy--Do as I have repeatedly told others. Put a v-belt sheave on the output shaft, and drive the engine at about 600 rpm with an electric motor. Make sure gas and spark are working and switch is on. Keep it running and play with the carb setting and timing until you get it to start firing more or less consistently. That will seal up any leaking valves. You need a bout a 3:1 ratio on the v-belt sheaves, --i.e. a 2" on the motor and a 6" on the engine (assuming you electric motors over there are +/- 1800 rpm.) 6" pulleys don't generally have a 3/8" bore, so make a split bushing to fit the 6" pulley to the 3/8" engine output shaft. Make sure its turning the right way.---Brian

 

[gus]

I used a hand held starter to spin engine to run and seat the piston rings and valves.

In between,I let the starter to cool down for two hours and spun engine till I could feel good suction and good resistance to TDC.

The engine gave a few pops and after adjusting fuel jet needle,I did get her started and from there fine tuning of carb. Carb tuning can be evasive and eventually with some patience I got her running. From tune carb. Was good that I had some good experience with the Webster Engine before building the Ropnow H&M.

Hang on there as you are nearly there. Carb/valve timing/igniton timing can be fun and frustrating. Either one will mess up starting.

Happy New Year.

 

[Brian Rupnow]

I take it that the Australian version of the "Rupnow Engine" is now resting on the bottom of a Bilabong??