Valve operating design - Sportbike Forum: Sportbike Motorcycle Forums
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 26 (permalink) Old 03-02-2002, 02:11 PM Thread Starter
 
Join Date: Oct 2001
Posts: 373
Valve operating design

In the 1960s Ducati introduced the Desmo valve, and almost every other company had common valve springs. This company introduced another way to close the valve. It was state of the art and allowed the engine to rev to 10,000 RPM when all other engines of that time only reved to 6,000 RPM.

What year, make, and model was it. What type of valve return mechanism did they use?

Andy
Andy is offline  
Sponsored Links
Advertisement
 
post #2 of 26 (permalink) Old 03-02-2002, 10:51 PM
 
Join Date: Nov 2001
Posts: 377
Need more research, but we talking about Pneumatic valves ?


Last edited by titomike; 03-02-2002 at 10:54 PM.
titomike is offline  
post #3 of 26 (permalink) Old 03-03-2002, 02:58 AM Thread Starter
 
Join Date: Oct 2001
Posts: 373
Hi Mike,

Sorry it was not Pneumatic valves. This was a production motorcycle that was very popular.

Andy
Andy is offline  
 
post #4 of 26 (permalink) Old 03-03-2002, 03:06 AM
 
Join Date: Jul 2001
Posts: 714
Methinks it is the bevel-driven overhead cams you're teasing us with used in the 250 Desmo of 1961.
Smeghead is offline  
post #5 of 26 (permalink) Old 03-03-2002, 03:42 AM Thread Starter
 
Join Date: Oct 2001
Posts: 373
Sorry Smeghead... It has nothing to do with the camshaft.

It was a device used to close the valves. It was not desmo, coil springs, or pneumatic.

Andy
Andy is offline  
post #6 of 26 (permalink) Old 03-03-2002, 05:19 AM
 
Join Date: Jun 2001
Posts: 1,188
It was a pullrod design. No spring needed to close the valve.
desmo079 is offline  
post #7 of 26 (permalink) Old 03-03-2002, 05:32 AM
Moderator
 
Grok's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC Canada V9E 1C8
Posts: 397
Arrow Spring?

Torsion bar valve springs on the 1967, 68, 69 Honda 450 Super Sport?(they later used conventional coil springs)

Try it...........You'll like it!

Last edited by Grok; 03-03-2002 at 05:36 AM.
Grok is offline  
post #8 of 26 (permalink) Old 03-03-2002, 01:33 PM Thread Starter
 
Join Date: Oct 2001
Posts: 373
Hi Desmo,

Sorry it was not the pullrod design. Its interesting that Ducati had such a design in their 1940 Cucciolo model.





Link source: http://www.ducati.com/heritage/museu...del=40cucciolo

Andy
Andy is offline  
post #9 of 26 (permalink) Old 03-03-2002, 01:38 PM Thread Starter
 
Join Date: Oct 2001
Posts: 373
Hi Grok,

Your correct!

It was the 1965 Honda CB450.





Andy
Andy is offline  
post #10 of 26 (permalink) Old 03-03-2002, 04:08 PM
Moderator
 
Grok's Avatar
 
Join Date: Oct 2001
Location: Victoria, BC Canada V9E 1C8
Posts: 397
Arrow Here's one for you Andy.(or anyone)

What does a torsion bar and a helical spring (like a fork spring) have in common?

Try it...........You'll like it!
Grok is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Sportbike Forum: Sportbike Motorcycle Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome