Donate!
Welcome, Guest. Please Login or Register :: View Members
Pages: 1 2 3 ... 6
Send Topic Print
Big Cam - Web 340b Install (Read 687 times)
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Big Cam - Web 340b Install
12/16/19 at 18:13:34
 
In my never-ending search for more power, it was time to explore the merits of a big cam.  Not a bolt-in cam with a bit more duration & lift, but a true big cam.  A cam that would bring out the best in my hotrod.
 
An aggressive cam will complement the other modifications and help them all work together.  The ported head, bigger carburetor, free flowing airbox and exhaust, and higher compression were all yearning for a bump-stick with some decent lift & duration.
 
The only candidates that I could find were the Web 420 grind and the Web 340b grind.  Both cams are intended for use in the early DR650.   This post will take you through my installation of the Web 340b.  It is the hotter of the two cams.  I figured if I was gonna go through all the trouble to set up a big cam, I might as well go for the gold.
Back to top
 

340b_Box_2.jpg

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #1 - 12/16/19 at 18:14:41
 
This is a shot of the stock cam and the 340b side by side.  You can see that the basic cores are identical.
Back to top
 

340b_vs_Stock_Core_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #2 - 12/16/19 at 18:15:21
 
If you compare the lobes you will note a pretty big difference.
Back to top
 

340b_vs_Stock_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #3 - 12/16/19 at 18:16:45
 
The 340b has more lift and aggressive ramps.  You must run stiffer springs with more travel.  This is the spring kit Web recommends for the DR650.  
Back to top
 

Web_Spring_Kit_by_RD_2.jpg

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #4 - 12/16/19 at 18:17:46
 
The spring kit is manufactured by RD Valve Springs.  Stock is on the left, RD is on the right.
Back to top
 

Stock_vs_RD_Assy_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #5 - 12/16/19 at 18:18:40
 
The RD retainers are titanium, and a lot different dimensionally.
Back to top
 

Stock_vs_RD_Retainer_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #6 - 12/16/19 at 18:19:32
 
The RD retainers are designed for the DR650 valves.  They won’t work on the LS.
Back to top
 

RD_Retainer_Fitup_2_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #7 - 12/16/19 at 18:21:56
 
The RD cotters are also a lot different.   I tried using the stock cotters with the RD retainers.  The angle is different, so the stock cotters won’t work with the RD retainers.
Back to top
 

Stock_vs_RD_Cotter_2.jpg

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #8 - 12/16/19 at 18:23:02
 
I decided to use the stock spring retainers with the RD springs.  I contacted RD Valve Springs to see if the springs can be purchased separately.  The spring part number is 1010 and they will set you back $38 bucks a copy for a total of $152.  You can order them direct from RD Valve Springs (760) 948-4698.  Website is www.rdvalvespring.com.  Good guys BTW.  They get right back to you.  I might also mention that the finish on their spring is much better than the stockers.  End grinds are nice & square and spring pressure vs lift was consistent on all four assemblies.
Back to top
 

RD_Retainer_Installed_2_2.jpg

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #9 - 12/16/19 at 18:23:56
 
The 340b cam has .417” advertised lift.  The stock springs start coil binding at .400”.  
Back to top
 

Stock_Spring_Coil_Bind_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #10 - 12/16/19 at 18:25:17
 
This shows the RD spring assembly at .450” lift.  Plenty of room left on this one.  Good to go.
Back to top
 

RD_Spring___450_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #11 - 12/16/19 at 18:26:14
 
Here is a graph that compares the RD spring force to the stock spring force.  
Back to top
 

Stock_vs_RD_Spring_Graph_2.jpg

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #12 - 12/16/19 at 18:27:38
 
The valve guides must be shortened to accommodate the additional valve lift.  I made a tool.  It’s a simple design that uses 1/8” HSS tool bits.
Back to top
 

Guide_Cutter_8_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #13 - 12/16/19 at 18:28:26
 
Takes about one-hour to do all four guides.
Back to top
 

Guide_Cutter_2_2.JPG

Knowledge is power.
  IP Logged
DragBikeMike
Serious Thumper
*****
Offline

SuzukiSavage.com
Rocks!

Posts: 4071
Honolulu
Re: Big Cam - Web 340b Install
Reply #14 - 12/16/19 at 18:29:41
 
The finished product at the top of the photo.  This was a test cut on a junk head.
Back to top
 

Finished_Guide_Test_2_2.JPG

Knowledge is power.
  IP Logged
Pages: 1 2 3 ... 6
Send Topic Print


« Home

 
« Home
SuzukiSavage.com
03/28/24 at 10:43:54



General CategoryRubber Side Down! › Big Cam - Web 340b Install


SuzukiSavage.com » Powered by YaBB 2.2!
YaBB © 2000-2007. All Rights Reserved.