Author Topic: Rizzo....... (Read 29369 times)

NickG · « **Reply #25 on:** June 20, 2011, 05:00:02 AM »

David, it could be, it doesn't take much. Just going off the 32mm and 26mm, the ratio of volumes is only 1.5 (pretty small), as you say, when you take off the diameter of the shaft that doesn't leave much at all, especially when there is quite a bit of 'dead' space in the system. It may require a lot of heat to run? To me the design sounds marginal but you've just shown a working one (can't see it here though)

I was going to say, different piston material could be a good idea too.

Nick

Stilldrillin · « **Reply #26 on:** June 20, 2011, 05:45:24 AM »

Nick.
I have literally, just stripped it down again......

The alloy piston has a few small dings/ burrs, and is a little too tight for my liking, in the stainless cylinder. (Expansion, and all that).

Think I'll give it a polish, and chamfer the "thrust faces" of the crank bearing to reduce oil drag.

If that doesn't work, then I might start to do some alterations.......

Did anyone else see what that green one went for?

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=300567752307&ssPageName=STRK:MEWAX:IT

£226.87 !!! Sheesh!

David D

Bluechip · « **Reply #27 on:** June 20, 2011, 06:23:09 AM »

Hi Dave

Stick at it .. I'm sure the Rizzo will do a Whizzo sooner or later ...

Not sure I'd pay that price for the one on feebay ... it's a bit ugly ...

Not as ugly as me I admit, but it's running a close second ..

Dave BC

Stilldrillin · « **Reply #28 on:** June 20, 2011, 04:16:34 PM »

Gave the piston a deburr & polish. Spacered the two conrods on the crankpin. Put everything back properly, again.

Close, but no cigar! It was trying, spinning free for many revs. Always stalling on the vacuum stroke.........

So, I added more heat.......

YEEeee....... HAaarrrrrr!!!!!

Tried the lighter flywheel. No difference........

Runs only at medium/ high revs. With a lovely thumping sound. I think, due to the pressure stroke doing all the work.

Another Orphan revived!

Happy Little Drillin........

David D

Bluechip · « **Reply #29 on:** June 20, 2011, 04:42:45 PM »

There you are, you see.

I knew you'd crack it

Where's the video then ???

Dave BC

sbwhart · « **Reply #30 on:** June 20, 2011, 05:11:44 PM »

I knew you'd tame it Dave

I wonder

if there was any significance in the ebay engine running with a cowl and chimney getting more heat into the system.

Stew

Rob.Wilson · « **Reply #31 on:** June 20, 2011, 05:37:29 PM »

Just new you would get here sorted David

Rob

I

,,,,,,,, were is the video

Stilldrillin · « **Reply #32 on:** June 20, 2011, 05:54:51 PM »

Thanks Chaps!

Video? Now hang on....... It's not finished yet!

Going to fit a smaller dia displacer shaft, and see what difference that makes, if any.

Then, I've got to make a burner it will run with.

It's not all euphoria here, you know. Can't just sit back and relax, cos it's running. Have to do the whole care package.......

David D

Dean W · « **Reply #33 on:** June 20, 2011, 06:27:13 PM »

I think you've got the touch, David!

stirling lad · « **Reply #34 on:** June 21, 2011, 10:11:43 AM »

Another naughty little engine skelped into shape and set on the right road

puzzle solved.. 10/10

...Mike...

SPiN Racing · « **Reply #35 on:** June 21, 2011, 10:29:22 AM »

Very nice work giving it CPR!
Looking forward to the video!

Scott

NickG · « **Reply #36 on:** June 21, 2011, 07:15:35 PM »

David,

Nice 1, friction seems half the battle with these, my stirling with no heat on it, will move and find it's own position due only to the weight of the piston and the imbalance in the assembly - this is a floor in itself but at least proves the friction is low, balancing only seems critical on LTD engines in my experience, assuming you're just after getting a runner. I have no doubt that a smaller displacer shaft will help slightly, as would the cowl as Stew says.

Well done, you've certainly got the knack of these.

Nick

Stilldrillin · « **Reply #37 on:** June 22, 2011, 02:16:54 AM »

Thanks for all your positive comments Chaps! Much appreciated......

Didn't manage much, yesterday. But I proved sleeve retainer is much superior to the glue previously used.

Getting the assembly apart again, with the blowlamp, was a bit of a struggle. Needed much more heat........

I sawed off the displacer shaft, and "glued" a brass slug into the shaft bearing hole, ready to drill out to 4mm.

Hope to pick up again, in a day or so.

David D

Stilldrillin · « **Reply #38 on:** June 23, 2011, 12:58:43 PM »

Managed a couple of workshop sessions today.

Faced end of shaft flush. Tap drilled. Counter drilled 4mm. Tapped 1/8" Whit.........

Turned/ threaded some 4mm silver steel, to spigot 1/4" deep into original shaft.......

Screwed together,with sleeve retainer. All nicely straight/ in line.......

Bushed the shaft bearing and clevis to new size........

Assembled all parts, with sleeve retainer........

Got it all nicely assembled, and spinning freely. Bouncing off compression, when the knurled plug was fitted.........

Then, I realised me little legs had had enough....... And, tomorrow's another day......

You'll all have to wait a little longer, for the grand video! Sorry! ........ (Not really)......

David D

NickG · « **Reply #39 on:** June 23, 2011, 03:43:38 PM »

That looks a lot more sensible to me Dave

now wake up and do the video

bouncing off the compression still shows that ratio of swept volumes is small for this design - that's not a bad thing, it makes the engine more efficient but it does require more heat.

Dean W · « **Reply #40 on:** June 23, 2011, 08:54:43 PM »

How's your supply of sleeve retainer holding out, David? Looks like they have another fan of their product. : )

stirling lad · « **Reply #41 on:** June 23, 2011, 09:30:51 PM »

The tensions unbearable,,will it ?? wont it?? If It does'nt run will he have enough sleeve retainer to rebuild it again ??? so many questions

but it is looking great David,and i cant wait for the video too...

Mike...

Stilldrillin · « **Reply #42 on:** June 24, 2011, 02:16:47 AM »

Mornin' Chaps! Thanks for your comments......

Dean, the "glue" is still coming from it's tube, when requested. Wonderful stuff. Goes a long way!

There were a few days of mild panic, after I'd assembled the displacer assembly for the first time......... Couldn't find the tube in it's card!

Four days of searching, produced lots of things which I didn't know were lost!
On the fifth day, Mrs. Drillin said. Is this what you're looking for? It was under some clean washing!!

Don't ask..... I don't know either!

What a terrifying situation to be in....... NO Sleeve Retainer!

However did I manage, before that little blue tube came into my life!

David D

Bluechip · « **Reply #43 on:** June 24, 2011, 02:27:06 AM »

Dave SD

Is this the stuff ??

http://www.hogparts.co.uk/index.php?main_page=product_info&products_id=85540

Must be very wealthy around Chesterfield ??

Dave BC

Stilldrillin · « **Reply #44 on:** June 24, 2011, 03:19:42 AM »

Quote from: Bluechip on June 24, 2011, 02:27:06 AM

Dave SD

Is this the stuff ??

http://www.hogparts.co.uk/index.php?main_page=product_info&products_id=85540

Must be very wealthy around Chesterfield ??

Dave BC

Guess so........

Don't need to be wealthy Dave, when you have good friends in other places........

David D

Bluechip · « **Reply #45 on:** June 24, 2011, 03:44:30 AM »

Hi Dave SD

Ah yes ...

Er ... shall we say .... 'transparent to the system' ??

My sort of commerce ..

Dave BC

DMIOM · « **Reply #46 on:** June 24, 2011, 05:08:44 PM »

Quote from: Stilldrillin on June 24, 2011, 02:16:47 AM

.........On the fifth day, Mrs. Drillin said. Is this what you're looking for? It was under some clean washing!! ........What a terrifying situation to be in....... NO Sleeve Retainer! ......However did I manage, before that little blue tube came into my life! ......

Well, maybe the washing needed mending too? - how does it work on a Raglan sleeve?

Dave IOM

Stilldrillin · « **Reply #47 on:** June 30, 2011, 03:47:36 PM »

Quote from: DMIOM on June 24, 2011, 05:08:44 PM

Well, maybe the washing needed mending too? - how does it work on a Raglan sleeve?
Dave IOM

Nice one Dave! Never thought, Mrs D might be to blame!

Finally managed to have a heat up this afternoon, and remembered the camera too.......

This is a later video. Taken with a newer/ better camera.......

It's probably run for 2 hours or more, now.

I lube the moving parts with 5W-30 engine oil. But, the power piston gets a fuff of WD-40, as it only gets very slightly warm.

Another orphan rescued!

But, three more have arrived, since mid May.......

David D

Bernd · « **Reply #48 on:** June 30, 2011, 04:29:13 PM »

Very nice David.

Bernd

NickG · « **Reply #49 on:** June 30, 2011, 06:17:28 PM »

Nice work David, looks stunning and runs superbly now.

It's amazing how some of those little things you modded can affect the running of these engines.

Nick

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Author Topic: Rizzo....... (Read 29369 times)

Rob.Wilson