Cox Engines Forum
You are not logged in! Please login or register! Guests are limited to posting in the "General Questions (Guest Posting Allowed)" section only. Becoming a member is fast, easy and FREE!


Olympic .15 Disc Valve Engine? Babe_b10
Log in

I forgot my password

Search
 
 

Display results as :
 


Rechercher Advanced Search

Latest topics
» Sig Deweybird 1/2A
by Marleysky Today at 12:21 am

» Remote control planes
by Marleysky Today at 12:10 am

» external fuel tanks
by Surfer_kris Today at 12:06 am

» How's the weather?
by Oldenginerod Yesterday at 11:10 pm

» Nylon tubing
by jbanes1961 Yesterday at 11:05 pm

» Screws For Engines
by ffkiwi Yesterday at 11:04 pm

» Lookie Here
by --Oz-- Yesterday at 10:42 pm

» Carl Goldberg Skylane 42
by NEW222 Yesterday at 10:29 pm

» Late Find Possible Meteor Shower Thursday November 21
by NEW222 Yesterday at 9:18 pm

» Hidden Gem Finds
by DrCox Yesterday at 9:13 pm

Cox Engine of The Month
November-2019
jmcalata's

"Pee Wee .020 throttled combinated"



PAST WINNERS
CEF Traveling Engine

Win This Engine!
The Traveling Prop
Gallery


Olympic .15 Disc Valve Engine? Empty
World of Aviation

Olympic .15 Disc Valve Engine?

Page 1 of 2 1, 2  Next

Go down

Olympic .15 Disc Valve Engine? Empty Olympic .15 Disc Valve Engine?

Post  Jason_WI on Fri Jan 25, 2019 12:04 am

So I won this on eBay a few days ago. I have an addiction.....

https://rover.ebay.com/rover/0/0/0?mpre=https%3A%2F%2Fwww.ebay.com%2Fulk%2Fitm%2F264133758438

It has a disc valve and a drum valve as part of the timing mechanisms. I have never seen mention of a disc valve Olympic engine. I’m thinking this was made by someone other than Cox.

Olympic .15 Disc Valve Engine? 1b343b10
Olympic .15 Disc Valve Engine? 8b10e810
Olympic .15 Disc Valve Engine? De2c9810

The rear drum valve is included. It looks to be authentic but there are differences in the drum.

Olympic .15 Disc Valve Engine? 6c765b10
Olympic .15 Disc Valve Engine? 020fbe10
Olympic .15 Disc Valve Engine? 44ca0710


Here are the comparisons between drum valve assemblies. The broken carb body and the drum valve with the thicker wall is the new one.

Olympic .15 Disc Valve Engine? 8b6a2a10
Olympic .15 Disc Valve Engine? 7e2d1810
Olympic .15 Disc Valve Engine? Cd50f110

Now the concerning part of this purchase. The crank pin on this engine looks to have been pressed in but the diameter is too small to drive the drum valve.

MOlympic .15 Disc Valve Engine? 84e85110
Olympic .15 Disc Valve Engine? A060c710
Olympic .15 Disc Valve Engine? Aa2dfb10

Here are pictures of my other drum valve engine crank pin. It is part of the crankshaft like the RR-1 crank.

Olympic .15 Disc Valve Engine? 140a6810
Olympic .15 Disc Valve Engine? 9e1cc210

I asked the seller for more history on this engine. The crank pin is concerning enough. I seem to be attracted like a moth to a light to fake engines like the fake Strato Bug a few years ago I had to send back to a seller on eBay.
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Cribbs74 on Fri Jan 25, 2019 12:23 am

Interesting Jason, who on this forum could provide an answer? Mudhen?

You either have something rare or something home made. Hopefully the former. Did the seller ever respond?
Cribbs74
Cribbs74
Moderator

2019 Supporter

Trusted Seller
Posts : 10562
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  crankbndr on Fri Jan 25, 2019 6:45 am

One sure thing, eBay will side with you no matter what if you send it back and you will get your money back.
crankbndr
crankbndr
Diamond Member
Diamond Member

I Support My Forum

Posts : 2428
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  getback on Fri Jan 25, 2019 7:15 am

Is that a spot weld in the second pic , one of intake ? i know what you were probably thinking on the plastic replacement but as you said the pin is a problem . You can clearly see it in your pics. And what the heck camera are you using to get souck detail pictures ? Very Happy
getback
getback
Top Poster
Top Poster

2019 Supporter

Posts : 6362
Join date : 2013-01-18
Age : 62
Location : julian

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  crankbndr on Fri Jan 25, 2019 7:39 am

I wonder where the white plastic parts came from?
crankbndr
crankbndr
Diamond Member
Diamond Member

I Support My Forum

Posts : 2428
Join date : 2011-12-10
Location : Homestead FL

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Cribbs74 on Fri Jan 25, 2019 8:07 am

So you have to think, Getting the olympic was easy, but re-creating the drum valves and the plastic housing isn’t. You would almost have to think that at least some of the parts are genuine

Cribbs74
Cribbs74
Moderator

2019 Supporter

Trusted Seller
Posts : 10562
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  gkamysz on Fri Jan 25, 2019 8:17 am

How do you prove this was or wasn't a prototype vs. the brainchild of a garage engineer? If this was an early prototype and the cranks with the drive pin weren't ready, it would make sense a smaller pin was pressed in to do some testing. Drilling a hole as large as the designed pin would weaken the crankpin excessively. The disc drive pin and disc looks pretty crude for a factory item, but so does that RR-2 beam mount prototype. I guess a careful machinist would have done a nicer job. Bill Hughes is well known, I doubt he's trying to pull anything. Hopefully there is some history available.
gkamysz
gkamysz
Gold Member
Gold Member

Posts : 133
Join date : 2018-02-22
Location : Chicagoland

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Fri Jan 25, 2019 8:58 am

Here is what I got back from the seller:

“Hi, This engine was part of the Glenn Lee estate. I have been asked to sell some of his old equipment to help pay for some of his health care costs. He is 87 and is now in a memory care facility. In case you do not know, Glenn Lee was a 2x USA F2A Speed Team Member in the 1960/70. He was 3rd in the 1964 World Championship in Hungary. He is one of the Legends of CL Speed in the USA.”

So it makes sense as to why the fins were cut down to probably to streamline the engine. The disc valve looks like it was used as the aluminum behind the plastic valve is a mirror finish polish.

I believe the drum valve portion is real. The disc valve was probably made by Glenn. Maybe something happened to the crank pin and a new one was pressed in. When pushing to the extreme things happen.



Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Fri Jan 25, 2019 9:56 pm

getback wrote: And what the heck camera are you using to get souck detail pictures ? Very Happy

Boom mounted microscope with fiber optic light source. Picked out of the trash at work. I use my iPhone 8 through the eyepiece. Gets good detail. I took off the .5x lens to get more magnification. Comes in handy to remove burrs from cylinders.
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Sat Jan 26, 2019 1:11 am

Working on drawing up the carb body for the drum valve. Hopefully print it out in nylon tomorrow.

Olympic .15 Disc Valve Engine? 5fc8be10
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  balogh on Sat Jan 26, 2019 6:26 am

Jason_WI wrote:Here is what I got back from the seller:

“Hi, This engine was part of the Glenn Lee estate. I have been asked to sell some of his old equipment to help pay for some of his health care costs. He is 87 and is now in a memory care facility. In case you do not know, Glenn Lee was a 2x USA F2A Speed Team Member in the 1960/70. He was 3rd in the 1964 World Championship in Hungary. He is one of the Legends of CL Speed in the USA.


Having read the above I (a Hungarian) searched the net for that 1964 event here and found that the Championship was held on July 29th 1964 with Bill Wisniewski of USA ending in 1st place with a speed of 227 km/ h, the 2nd was a famous Hungarian Gyula Krizsma with a speed of 225 km/h and Glenn Lee the 3rd at 223 km/h...pretty high speeds. The Hungarian Krizsma probably raced with a famous MOKI engine that he himself designed and manufactured...Glorious times of aeromodeling..
balogh
balogh
Diamond Member
Diamond Member

Posts : 2490
Join date : 2011-11-06
Age : 61
Location : Budapest Hungary

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Sun Jan 27, 2019 12:12 am

Thanks for the confirmation of how he placed in '64 in the CL speed event.

Olympic carb body all drawn up and on the printer now.

Olympic .15 Disc Valve Engine? Olympi10


Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Sun Jan 27, 2019 12:26 am

Hot off the printer. Need to shorten the neck a bit and I should be all good. This is clear PETG. Next ones will be nylon.

Olympic .15 Disc Valve Engine? Dd135910
Olympic .15 Disc Valve Engine? Ddc5a110
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Admin on Sun Jan 27, 2019 12:37 am

Looks good! Popcorn

_________________
-Jacob


Admin
Admin
Administrator

Posts : 5064
Join date : 2010-07-27
Location : Roseville, Minnesota

http://sites.google.com/site/coxenginecollection/

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  getback on Sun Jan 27, 2019 7:26 am

You got me wanting a cnc printer !! Nice !! Small Cox Logo
getback
getback
Top Poster
Top Poster

2019 Supporter

Posts : 6362
Join date : 2013-01-18
Age : 62
Location : julian

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Cribbs74 on Sun Jan 27, 2019 11:34 am

Are you going to do them in Nylon? They look awesome. Too bad you didn’t have that printer when you were fixing my TD .15 carb body. It would have been a lot less work!

Edit: I guess I need to work on reading comprehension... I didn’t see you already plan on doing thrm in Nylon.
Cribbs74
Cribbs74
Moderator

2019 Supporter

Trusted Seller
Posts : 10562
Join date : 2011-10-24
Age : 45
Location : Tuttle, OK

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  NEW222 on Sun Jan 27, 2019 12:47 pm

Very nice work with the 3d printer.
NEW222
NEW222
Diamond Member
Diamond Member

Posts : 2386
Join date : 2011-08-13
Age : 41
Location : oakbank, mb

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Sun Jan 27, 2019 4:54 pm

Here is the carb body in zytel from DuPont.

Olympic .15 Disc Valve Engine? 975e1e10
Olympic .15 Disc Valve Engine? B3a7ec10
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Mudhen on Sun Jan 27, 2019 5:25 pm

That’s way cool.
Now can you build me:
An end cap, rotor, rotor housing, carb body, needle valve, retainer, filter nut, crank shaft, bearing assembly, crankcase, drive plate, cylinder, connecting rod, piston, cylinder head, lower insulator, glow filament, upper insulator, washer, and glow plug core?
I already have glow head gaskets.
Thanks.
Mudhen
Mudhen
Gold Member
Gold Member

Posts : 443
Join date : 2011-09-19

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  ffkiwi on Mon Jan 28, 2019 6:41 pm

The drum valve is certainly genuine-there were a small number of factory produced drum valve derivatives of the Olympic produced ca 1959-60-rumoured to be a total of 50-by Bill Atwood-which were passed out to various people for testing and evaluation-at least one was used at the 1960 FF World Champs.....this was part of the R&D which lead directly to the TD series
....as for the disc valve unit-the workmanship is poor enough to convince me that this is NOT a factory job....
...as for the drive pin holes-well if you're starting off with standard Olympic components it is a lot easier to drill the crankpin for an insert extra pin than machine up, harden and grind a completely new crankshaft-and was well-there is ample precedent for rear disc drum engines using a drive pin of this 'press in' or 'plug in' nature simply for reasons of production economy-the Webra Mach-1, the Taifun Meteor-both 2.5cc BB rear disc engines-use this approach.

ChrisM
'ffkiwi'
ffkiwi
ffkiwi
Bronze Member
Bronze Member

Posts : 56
Join date : 2018-07-10
Location : Wellington, NZ

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Mon Jan 28, 2019 7:15 pm

When attempting to fit the drum valve back half to the crankcase with the modified crankshaft there is interference when the drum valve is tightened up. The crank pin is too long. So this crankshaft was specifically modified for the disc valve rear section as it fits without any interference.

I would like to run the disc valve engine but need to figure out a spray bar and needle valve to use. The venturi opening on the rear is threaded on each side. Not sure if that held in place another insert with spraybar mounted into that. The opening is pretty small so what ever it may have been would need to be thin.

Olympic .15 Disc Valve Engine? 3ab26b10
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  ffkiwi on Mon Jan 28, 2019 7:38 pm

Try a K&B racing NVA-the 7738 one-that screws into each side...an 8-32 or 10-32 thread if memory serves-and is a surface jet type-ie no spraybar-the jet is on one side the the venturi and only the needle itself projects into the venturi...    ie the type used in the K&B 3.5 and the 4.9, and 6.5 FF/CL K&B FR engines of the 80s...

ChrisM
'ffkiwi'
ffkiwi
ffkiwi
Bronze Member
Bronze Member

Posts : 56
Join date : 2018-07-10
Location : Wellington, NZ

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Mon Jan 28, 2019 8:28 pm

Thanks for the tip on the 7738 NVA. That rear disc assembly looks like it was made to use this.

Olympic .15 Disc Valve Engine? 60887b10
Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  ffkiwi on Mon Jan 28, 2019 8:38 pm

That's the one alright-as soon as I saw the tapped holes in your rear disc backplate assembly venturi I thought 'aha-K&B racing NVA...'.....and I omitted to mention earlier-also fitted as standard to the rear drum K&B 15 schneurle series 72 non R/C version....

ChrisM
ffkiwi
ffkiwi
Bronze Member
Bronze Member

Posts : 56
Join date : 2018-07-10
Location : Wellington, NZ

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Jason_WI on Wed Jan 30, 2019 12:26 am

3/8-32 tap and die set came in. Venturi installed. Too bad it’s not the correct venturi. This is one for a TD .15.

Olympic .15 Disc Valve Engine? 38831c10


The one used on the drum valve engines was bowl shaped vs the trumpet shaped shown here.

Olympic .15 Disc Valve Engine? 5e5d5c10


Jason_WI
Jason_WI
Diamond Member
Diamond Member

2019 Supporter

Posts : 2734
Join date : 2011-10-09
Age : 44
Location : Neenah, WI

Back to top Go down

Olympic .15 Disc Valve Engine? Empty Re: Olympic .15 Disc Valve Engine?

Post  Sponsored content


Sponsored content


Back to top Go down

Page 1 of 2 1, 2  Next

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum