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TriumphTune Roller Rockers


anonymouse
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Spitfire 1500 Stage 4 head, fast road 80 cam, roller rockers, 1.65:1, after 18000 miles since restoration one roller has become detached, one is about to, a crack is evident in third light alloy location. Has anyone experienced this light alloy fracture allowing the rollers to become detached. Would it be possible to retro fit standard rockers, would there be a need to fit shims under the pedestals.New roller Rockers £850!! and they might fail again 18000 is not a great mileage!!    

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Failure of roller rockers is not uncommon - just google for it to find some right horror stories.

 

Whether you would need shims depends on what was actually done to the pedestals when the rockers were first installed.

 

It might be worth talking to Mark Field at Jigsaw Racing.

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On the old lost forum there was a load of clues about certain supplier roller problems

If I remember right Garth looked at some american made units but costs and low demand was never to work out as viable

 

the troubled ones fractured, lost locking screws and dismembered themselves

(Not Moss ones)

 

As for shims depends on the cam lift , stem height, to position the rocker ends at equal heights

And tappet gaps to prevent coil binding

 

Pete

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No chance of getting money back, all that sort of stuff is sold as racing parts with no real warranty.

I am amazed a 1500 engine with that spec has lasted at all, would have expected the crank to let go, so you are doing well!

 

You need to get advice from people used to racing engines, look at who the racers actually use to build engines, not who just sell the parts. 

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