Jump to content


Photo
- - - - -

Roller Rockers Can I Just Fit Them ?


  • Please log in to reply
3 replies to this topic

#1 GT Gray

GT Gray

    Learner Driver

  • Noobies
  • PipPip
  • 15 posts
  • Location: Evesham

Posted 16 September 2019 - 02:54 PM

Hi there.
The question is can I just fit some roller rockers without having to do any adjustments apart from obviously valve clearances ?
Motor is a 1380 with MK 3 S head and swiftune SW5 cam.
I presume I would need 1.5 been looking at MED and Minisport any recommendations from you guys ?

Cheers for now!

#2 Ethel

Ethel

    ..is NOT a girl!

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPipPip
  • 25,379 posts
  • Local Club: none

Posted 16 September 2019 - 03:55 PM

More or less, yes they can be just bolted on. There is the possibility of the valve springs coil binding and you'll be amplifying the spring rate seen by the cam. You'll also be decompressing the head gasket to get them on & you could probably get more out of them ìf you perfected the fitting height with shims or machining.

...and they might hit your rocker cover.

#3 DeadSquare

DeadSquare

    Up Into Fourth

  • Members
  • PipPipPipPipPipPipPipPipPip
  • 2,733 posts
  • Location: Herefordshire
  • Local Club: Unipower GT Owners Club

Posted 16 September 2019 - 05:06 PM

I'd say, not really, unless the rocker shaft just happens to be at the correct height.

 

To get the best out of them, the upward angle of the rocker with the valve closed has got to be the same as the downward angle with the valve fully open.

 

As Ethel mentions, this means shimming or shaving the rocker pedestals, and hopefully when this has been done, there will be sufficient adjustment in the tappet screws.


Edited by DeadSquare, 16 September 2019 - 06:06 PM.


#4 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 17,899 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 16 September 2019 - 05:59 PM

You can just fit them. But as some people find they fail as they did not check and adjust and set up.




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users