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

Cox Engine of The Month

"Prototype T.D. .010 c.1960"

Speed Contest 2018
CEF Traveling Engine

Win This Engine!
The Traveling Prop

World of Aviation

RR1 valve information

Go down

RR1 valve information

Post  jleboida on Sun Oct 27, 2013 9:50 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 1:28 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 : 10630
Join date : 2011-08-10
Age : 62
Location : South Carolina, USA

View user profile

Back to top Go down

Re: RR1 valve information

Post  Kim on Mon Oct 28, 2013 4:19 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 : 6246
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

Back to top

- Similar topics

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