MSC isn't what it used to be... 

Its fine, at least the humor helps with trying to see it through and I said I would measure. They are 1.33 inches.

Actually for any service with a purchase like this that was made sometime ago, I cannot complain. Wait till I ask Simon about the broken one. I was planning on doing that after I had the 1.3 replacements in hand. They no longer list replacement parts on the website, but I know they can be obtained, because he got the 1.3s replaced.

Yeah I sympathize. didn't mean to make light of your predicament with my tongue in cheek comment.

I will have to measure as my jaw hit the counter when I opened it and I walked away in disgust.

1.3 or 1.5 freeze plugs?

Replacement rockers not yet received.

Instead I got some nice new freeze plugs...

Just an FYI

The original eccentric roller tip issue with the Mini Spares 1.3 full roller rockers is in the process of being resolved.

Replacement rockers are in the mail.

The second issue with the broken full roller 15 set is being investigated courtesy of Mike.

Terry

Mike said he may have a line on some one who would look at it.

I will try to take him up onit, just for curiosities sake.

Terry

With out a Failure Analysis by a recognized Materials Lab it is not possible to tell exactly the failure mode but  I would make an educated guess that it is a fatigue crack with the origin indicated by the arrow on the photo. It doesn't appear to be overload as in overstressed by a push rod action.  A Materials lab can nail it down with their tools such as Scanning Electron Microscope (SEM) and material mass spectrometer. Sounds expensive and it probably is. This probably doesn't help very much but may be of some interest.

ETA: photo didn't load. anyway origin at oil hole at the channel.

Here are two of the close ups:

Steve:

I do not remember the specifics on the HS rockers. Originally I was told it was a drop in replacement. Then after discovering others had issues that needed some geometry adjustments, I ordered the "special" pedestals which still did not work. I was looking for a set that could be used on multiple engines without creating a unique head to match the rockers.

I think Marcel got a set to work, but he may have created his own pedestals.

Some photos of the broken parts are here:

//www.tmsmini.com/cooper/2015_broken_rocker/content/index.html

With standard rockers the car seems to run fine. I did not see any coil binding on other valves, before I removed the Titan rockers.

Obviously could not check the broken one, but no reason to think it was different than the others.

What was the builders issures with the Harland Sharps? I'm waiting for Calver to get me a set of pedistals in 1.4 to try with my Harland Sharps. Steve (CTR)

Many people have used the MSC roller tipped/bushed shaft rockers with out issue for many years.

I do not think my experience is typical.

This engine started out with the Harland Sharp rockers and the engine builders went through alot to try to make them work. Eventually I said enough. I really wanted some thing less for than 1.5 for this engine. The extra stress of the high lift seemed to take its toll on cams. I even had a set of the purple rockers on hand. At the time, the other common roller tipped 1.3 set was not available(sold out and on back order) so I went with the fuller roller version. The engine then waited to be put into use.

The engine will have stock rockers installed today waiting for the Calver ST 1.4.

I will get some close up pictures of the failed rocker later today.

Terry

I have several customers running the purple MSC rockets. No problems yet but they have only been in service a couple of years. Harland Sharpe makes rockers for minis but I'm not sure of the ratio. I'm looking for a set of pedistals to match. I have been told they are 1.4 but still in blister pac so I have not tested yet. The ST 643 cam does not like long ratio rockers so I plan to use them on a 1071 race engine. Steve (CTR)

I just installed the cheaper 1.5 ratio roller rockers, Mini Spares unit that is anodized in purple.  Now I wonder if I should risk even using them.  Maybe I should swap out for the forged 1.5 ratio rockers, as they certainly seamed to work fine on my Mini 30 years ago.  By the way, I have had Harland Sharpe roller rockers in my Cobra with a 351W motor for 15 years with no issues whatsoever.

Randy

1968 Morris Cooper S

Image Gallery

I know there are alot of rockers discussed, so just to clarify:

• the original issue was with the 1.3 full roller sold by Mini Spares and made by Titan with no markings. The vendor is working on this. These are in the youtube video and brand new.
• the second issue is with the 1.5 full roller also sold by Mini Spares and made by Titan but with the stamp on them. This is the one that broke. More than 50 K miles, probably closer to 70 K miles on them, but on a different engine.

Terry

And indeed the full roller rockers are still made by Titan, just no labels, at least on mine.

Terry

I got a reply back from the vendor of the original full roller 1.3 set I originally posted about.

They are waiting for a reply from the manufacturer, so progress on one front.

Terry

When vintage racing I found Titan rollers were the best at that time. The last couple of race engine I had built we used Nick Swift's roller rockers. Check the price, would you expect to buy for $200. what well known suppliers are selling for $700.? Adding a cam and long ratio rockers gives a lot to check. The last engine I did a freshening up on we went one step up on cam. During the dry build with flash light springs on two valves I found the retainer just contacting the valve guide at full lift. The springs we were using had enough space but there was still contact static. It was a street engine but still required care in assembly. Steve (CTR)

You can also fit offset bushes to these rockers for a little more lift. Don't believe the web BS that this will make them 1.5:1, the best you can hope to get is around 1.28:1.
Stock, pressed rockers measured 1.20-1.21:1 for me.
I made custom bushes with .044" offset, this gave a measured 1.31:1 with the common 850-998-1098 pressed rockers, and 1.35:1 with the oval pad pressed steel 1275 ones. But these bushes were so thin, I bored them to size from solid LG2 bronze after fitting.