Valve spring retainer - cracked!

[roger440]

Having decided to strip my engine down to sort out the bore scoring, ive been busy cleaning up the various parts.

Cleaning up the valve spring retainers, out of the 6 so far, 2 are cracked!!!!

No pics, phone was flat

Around the spring locating ring/shoulder.

The engine runs an STR91 cam, and uprated valve springs, as purchased from Moss/triumphtune back in 1994. Engines done less than 5000 miles in this guise, though who knows what mileage the retainers have done.

Is this a "known issue" when running uprated springs?

Whats the solution? I see sprintspeed do titanium ones. Is this the go, or are there other options?

[xvivalve]

It's not something I've encountered...but then it's also something I've not specifically looked for...

I have a quantity of used retainers and will look them out to see if any are similarly fatigued...

[SprintV8]

May be worth checking the valve springs clearance between coils on full lift..
Think it’s called binding.
Use to have this problem with the race Minis many years ago.
Mainly traced back to valve bounce.
Titanium retainers where not a option then.
I pretty sure Newman cams done us a slightly rework cam to cure the problem.

Are cams where all out race cams..

[SprintV8]

Only just remembered.

The Sprint engine that was in mine originally was sold.
It then went into a TR7.
It broke a couple of Caps on the M2.

Must be a age thing.

MERRY CHRISTMAS .