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!

Log in

I forgot my password


Display results as :

Rechercher Advanced Search

Latest topics
» How's the weather?
by KariFS Today at 2:59 am

» Videos not loading
by Marleysky Yesterday at 11:04 pm

» Shark XV Video
by Tee Bee Yesterday at 9:18 pm

» *For Sale* NIB Dick Mathis "Pinto"
by Ken Cook Yesterday at 5:12 pm

» Select Hobbies.
by 66 Malibu Yesterday at 4:21 pm

» 1939 Plymouth truck.. with radial engine installed
by rsv1cox Yesterday at 12:19 pm

» Cox Odyssey Spare parts and more ...
by MauricioB Yesterday at 11:43 am

» Differences between Texaco and other cox back plates
by NEW222 Yesterday at 11:10 am

» R/C dumb. Could use some help
by getback Yesterday at 8:22 am

» Tee Dee Head vs Medallion Head
by getback Thu Dec 14, 2017 8:59 am

Cox Engine of The Month
1/2A Nut's

"Chrome Moly TD .020 RC"

Speed Contest 2018
CEF Traveling Engine


Win This Engine!
The Traveling Prop
World of Aviation

RR1 valve information

View previous topic View next topic Go down

RR1 valve information

Post  jleboida on Sun Oct 27, 2013 10:50 pm

Do you have a one inch micrometer, a number drill set, good measurement skills, and an RR1? I have an RR1 in very good condition, but it is missing it's rear rotary drum valve. I have the skills and equipment (lathe, milling machine, dividing head, and measuring tools) to produce a new valve, using measurements of existing parts (crankshaft rotary valve drive pin, fuel tank rotary valve bearing, and the relative spacing between those parts), trial and error fitting, and best guess method to determine intake timing, but if I could get a few measurements of an actual valve, it would save a lot fiddling.

The basic measurements that would be most helpful, in descending order of importance are;
1. The outside diameter of the valve drum which slips into the fuel tank bearing +/- .0002 of an inch.
2. The thickness of the drive flange +/-.0005 of an inch.
3. The total length of the valve, drive flange and drum combined, +/-.0005 of an inch.
4. The number drill size of the inside diameter of the drum.
5. The number drill size of the drive pin hole in the flange.
It seems to me that 2 cycle engine timing is more art than science, so if anyone has any information on the actual RR1 intake timing I would really appreciate it. I was going to start with a total intake duration of180 degrees, and make both the opening and closing 35 to 40 degrees after bottom and top dead center, and see what happens.
New Member
New Member

Posts : 1
Join date : 2012-11-05

View user profile

Back to top Go down

Re: RR1 valve information

Post  RknRusty on Mon Oct 28, 2013 2:28 am

If you don't get all the responses you need, send a PM to Mudhen. He's the best RR1 builder on this forum.
Good luck, and welcome to CEF.

Don't Panic!
...and never Ever think about how good you are at something...
while you're doing it!

My Hot Rock & Blues Playlist

Posts : 10445
Join date : 2011-08-10
Age : 61
Location : South Carolina, USA

View user profile

Back to top Go down

Re: RR1 valve information

Post  Kim on Mon Oct 28, 2013 5:19 am

Sounds like a GREAT project, jleboida !!!!

Rusty's right...Mud oughta be able to get you the info. If possible, please keep us informed on your progress!

And Welcome to the Forum !!!!

Top Poster
Top Poster

I Support My Forum

Posts : 5746
Join date : 2011-09-06
Location : South East Missouri

View user profile

Back to top Go down

Re: RR1 valve information

Post  Sponsored content

Sponsored content

Back to top Go down

View previous topic View next topic Back to top

- Similar topics

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