Jump to content


Photo
- - - - -

Roller Rockers


  • Please log in to reply
19 replies to this topic

#1 Fastorq

Fastorq

    Mini Mad

  • TMF+ Member
  • PipPipPipPip
  • 123 posts
  • Location: Ayrshire

Posted 14 March 2019 - 08:22 PM

Best ones ?

MED, Minispares or Minisport?

#2 nicklouse

nicklouse

    Moved Into The Garage

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPipPip
  • 11,545 posts
  • Location: Not Yorkshire
  • Local Club: Anonyme Miniholiker

Posted 14 March 2019 - 08:26 PM

the MED ones look the closest to the Windsor ones which were the best. i would just make sure that the main bearings are bushed not rollers.



#3 imack

imack

    Super Mini Mad

  • TMF+ Member
  • PipPipPipPipPipPip
  • 518 posts
  • Location: Orpington, Kent

Posted 14 March 2019 - 08:30 PM

I'm running MED ones, very happy with them. Not used minispares or minisport ones. MED version run on an over sized rocker shaft, 18mm from memory, think the others use standard or thick walled 14mm shafts.

Edited by imack, 14 March 2019 - 08:51 PM.


#4 imack

imack

    Super Mini Mad

  • TMF+ Member
  • PipPipPipPipPipPip
  • 518 posts
  • Location: Orpington, Kent

Posted 14 March 2019 - 08:33 PM

the MED ones look the closest to the Windsor ones which were the best. i would just make sure that the main bearings are bushed not rollers.

MED ones don't run on replaceable bushes, they run straight on the shaft. There is an MED tech video on youtube with more details.
I've got the standard version, not the more expensive LDX version.

Edited by imack, 14 March 2019 - 08:51 PM.


#5 Bobbins

Bobbins

    Mini Mad

  • TMF+ Member
  • PipPipPipPip
  • 279 posts
  • Location: Chester

Posted 14 March 2019 - 08:49 PM

Any advantages of using the 1.3 ratio rather than 1.5 (other than reduced valve stem wear)?

#6 imack

imack

    Super Mini Mad

  • TMF+ Member
  • PipPipPipPipPipPip
  • 518 posts
  • Location: Orpington, Kent

Posted 14 March 2019 - 09:05 PM

Over sized ball adjuster screw threads too.

Attached Files



#7 ukcooper

ukcooper

    Camshaft & Stage Two Head

  • TMF+ Member
  • PipPipPipPipPipPipPipPip
  • 1,546 posts
  • Location: Stoke on Trent

Posted 14 March 2019 - 10:24 PM

med



#8 imack

imack

    Super Mini Mad

  • TMF+ Member
  • PipPipPipPipPipPip
  • 518 posts
  • Location: Orpington, Kent

Posted 15 March 2019 - 05:44 AM

[quote name="Bobbins" post="3587695" timestamp="1552596572"]

Any advantages of using the 1.3 ratio rather than 1.5 (other than reduced valve stem wear)?[/quote

I think some engines/cam combinations work better with 1.3 ratio. Also certain race regs demand 1.3 rocker ratios.

#9 Inno

Inno

    Stage One Kit Fitted

  • TMF+ Member
  • PipPipPip
  • 74 posts
  • Location: Zagreb

Posted 15 March 2019 - 07:39 AM

...not an expert and only doing some research for my own engine but understood that the camshaft wear is the main threat and disadvantage of 1.5 rockers - much lower longevity for a street used engine.

Guess that is not a problem for a race/track engine that will be checked and rebuilt on a scheduled bases anyhow.



#10 Moke Spider

Moke Spider

    Crazy About Mini's

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPip
  • 8,359 posts
  • Location: NSW
  • Local Club: South Australian Moke Club

Posted 15 March 2019 - 07:51 AM

Best ones ?

MED, Minispares or Minisport?

 

MED. They are designed and made better than the other two and that's reflected in the price.

 

I've broken a set of Mini Sport ones and likewise on the Mini Spares version.

 

 

...not an expert and only doing some research for my own engine but understood that the camshaft wear is the main threat and disadvantage of 1.5 rockers - much lower longevity for a street used engine.

Guess that is not a problem for a race/track engine that will be checked and rebuilt on a scheduled bases anyhow.

 

There can be a lot of reasons for increased Cam Wear which is all too easy to blame on the Rockers. If the Cam has received proper treatment and is in fact ground the right way in the first place, run with compatible Followers and run in when fitted, they won't suffer undue wear from running 1.5 Rockers.



#11 GraemeC

GraemeC

    Crazy About Mini's

  • TMF+ Member
  • PipPipPipPipPipPipPipPipPipPip
  • 5,127 posts
  • Location: Carnforth

Posted 15 March 2019 - 10:05 AM

I've broken MED ones (none LDX version).

 

They are bushed. 



#12 DeadSquare

DeadSquare

    One Carb Or Two?

  • Members
  • PipPipPipPipPipPipPip
  • 704 posts
  • Location: Herefordshire
  • Local Club: Herefordshire Motor Club

Posted 15 March 2019 - 10:06 AM

50 years ago, I used to use Triumph Spitfire rockers.

 

I got a better rocker ratio, and they are offset, which meant that I could offset bore and tube the pushrod holes and then open the inlet ports right out until they broke into the pushrod holes, which I smoothed out with epoxy.

 

I see that these days they make Triumph Spitfire roller rockers.



#13 Cooperman

Cooperman

    Uncle Cooperman, Voted Mr TMF 2011

  • Mini Docs
  • PipPipPipPipPipPipPipPipPipPipPip
  • 21,048 posts
  • Location: Cambs.
  • Local Club: MCR, HAMOC, Chelmsford M.C.

Posted 15 March 2019 - 11:51 AM

The ones I have are superb quality. They were made by Titan Motorsport in St. Neots, Cambs. I think they also make the ones sold by a lot of other retailers.



#14 imack

imack

    Super Mini Mad

  • TMF+ Member
  • PipPipPipPipPipPip
  • 518 posts
  • Location: Orpington, Kent

Posted 15 March 2019 - 03:01 PM

Found the links

https://www.youtube....Uk4IJ_3nFIIOysQ


https://www.youtube....Uk4IJ_3nFIIOysQ

#15 Moke Spider

Moke Spider

    Crazy About Mini's

  • TMF Team
  • PipPipPipPipPipPipPipPipPipPip
  • 8,359 posts
  • Location: NSW
  • Local Club: South Australian Moke Club

Posted 15 March 2019 - 05:43 PM

50 years ago, I used to use Triumph Spitfire rockers.

 

I got a better rocker ratio, and they are offset, which meant that I could offset bore and tube the pushrod holes and then open the inlet ports right out until they broke into the pushrod holes, which I smoothed out with epoxy.

 

I see that these days they make Triumph Spitfire roller rockers.

 

Something different.

 

Any idea of the ratio ?

 

I've heard of people also using rockers from one of the Toyota Corolla models too. I think they are 1.43:1 Ratio.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users

Mini Spares