Jump to content


Photo
- - - - -

dot-to-dot cam timing.......


  • Please log in to reply
4 replies to this topic

#1 mighty_mini

mighty_mini

    Sambo Spoon

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 2,499 posts

Posted 13 May 2004 - 07:06 PM

what degree is the dot-to-dot method of cam timing??

1xx degrees???

#2 dklawson

dklawson

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 10,923 posts
  • Name: Doug
  • Location: Durham, NC - USA
  • Local Club: none

Posted 20 May 2004 - 05:26 PM

I'm not sure I understand your question. If I do... there are too many unknowns to answer that. It all depends on what cam you have. It's also worth remembering that the cam and its associated components are all subject to manufacturing tolerances. Even if the dot-to-dot method ideally gave a timing of 102 degrees (or something), the range might be 99-105 degrees when the tolerances are added in... and of course the chain will stretch too. That's one of the reasons there are offset keys and variable cam timing kits... so you can get it just right.

#3 mighty_mini

mighty_mini

    Sambo Spoon

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 2,499 posts

Posted 20 May 2004 - 06:56 PM

i wanted to know what degree the dot-to-dot method produced on a standard cam.. si i cud figure out what key i needed for a certain cam. badabing!

#4 dklawson

dklawson

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 10,923 posts
  • Name: Doug
  • Location: Durham, NC - USA
  • Local Club: none

Posted 20 May 2004 - 07:10 PM

Sorry, you have to measure it then figure out what key you need. There is no point in guessing which offset you need. You measure what you've got.

#5 Cooperman

Cooperman

    Uncle Cooperman, Voted Mr TMF 2011

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 23,014 posts
  • Location: Cambs.
  • Local Club: MCR, HAMOC, Chelmsford M.C.

Posted 21 May 2004 - 08:14 PM

With the dot-to-dot method it's about 106 degrees if you have a standard cam. For a kent 276 or 286 it should be 110 deg. However, as mentioned, it's always incorrect due to the tolerances in crank, cam, & timing gear machining, so 3 to 5 degress out either way is not uncommon.
To save buying vernire timing gears i often ust offsewt woodruf keys. you can get these in a range of 1 degree increments up to, I think, 8 degrees, so you can get the cam timing spot on. it's not difficult to do, either. All you need is an engine protractor and a dial gauge. If you time the cam about 2 degrees advanced from manufacturers recommended it seems to give a bit of an advantage, especially as the chain stretches during use.




1 user(s) are reading this topic

0 members, 1 guests, 0 anonymous users