PK,
Some Mini valve stems are stellite tipped.
Obviously, not this one.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I'm not sure haw fast it will go really...its dry sump as well I see which will improve things somewhat...


The replacement valve I picked up today has a treatment which can be noted by the change in metal colour to about 1/2 an inch down from the tip of the stem, and once again over the valve head and up the stem a little way. It does look like heat treatment. Is this a localized annealing ?

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Are they?



OBVIOUSLY

So which ones have the stellite tips? I just turned a set of 1275 valves down for a 998 head, and funnily enough the place I checked for hardens was the valve tip

I thought they were Nimonic, and that I'd need to grind them (being mostly nickel) but they were soft enough to turn with HSS.... so I doubt it...

Is it a particluar brand or is it just a particular series from the factory?

I think they were used on some Metros, the triple collet grooved ones.
factory valves I think, it's been a while but I have seen them.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

Doubt it... I'd say it would be hardening actually? You'd only need to anneal it if it was hardened to start with





THATS IT,, i'M RUNNING AWAY...!!!

Wheres the shed keys,,, I'm going dig up some new valves (as in not second hand and of un known origine)

Its going to be cold out there...its pretty bracing over this way..
I've got the garage door open to heat the garage a little, Megan says I am just cooling the house..

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SooperDooperMiniCooperExpertEngineering

All garage work involves equal measures of enthusiasm, ingenuity and a fair degree of irresponsibility.

Now that you mention it, that does sound about right (I think).. They were sodium filled, I know that for sure... I'll check while I'm digging upi std valves

But you'd know if it was a set of these for sure, their a larger Dia...

nope,, on a mission now... gotta... find .... out!!!!! I don't care if its Blizzarding!!!!!!


(Yeah 7 degrees is a little nipple-y)

only the metro "TURBO" Exhaust valves were sodium filled

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No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Surley they must be hardend to some level or they would all just mushroom on start up as there is a hell of a lot of pressure on those stems.

What about case hardened, you can still file case hardening

WWW here I come, teh answer is out there

Kiwiinwgtn

Didn't ah....

*stops,,, re-reads the Doc's post"*

Yes, Matt, you're absolutely right...

Ok, so the only valves I could find quickly were a set of rimflow intakes and a set of C-AEG106 exhausts from Karcraft...

The Rimflows... hard I'd say... about.... OOoooo... hard

The 106's.... about as hard as tool steel.... no signs of heat treatment on these ones though Mick... just on the faces, thats it....

As for the ones I just turned at work.... I'm gunna say, time to revisit those and have a second look... in light of this evenings findings... that is... odd...

Found this from a valve maufactorer website

Engine Valves

We offer an all encompassing range of GRINDLAYS valves, which contains intake valves, exhaust valves and engine valves. Our engine vales are manufactured using superior quality chrome plating and valve steel series- EN18D, EN24, EN52,EN54, EN59(214N) (Non-Magnetic/Bimetal) with varied hardness from 20HRC to 50HRC. Available in over sizes, these engine valves are extensively used in automobiles, tractors, industrial & diesel engines, generators and two wheelers.

Our intake and exhaust valves are manufactured from a variety of materials to be operated under different conditions. These valves are manufactured using super grade valve steel series - EN18D, EN24, EN52, EN54, EN59(214N) (Non-Magnetic/Bimetal). These valves are available in different dimensions ranging from 20HRC to 50HRC as per the material used and the application of the valve.

Normally, our intake valves are manufactured from high quality alloy steel, as these valves are not exposed to the corrosive action of the hot exhaust gases. Consequentially, these intake valves provide the users long time hassle free service. For manufacturing exhaust valves, we use chromium silicon, which makes them resist to corrosion due to high temperature and hot gases.

We offer our range of valves in different customized dimensions depending upon the requirements of our clients. These valves are most reasonable in rates

The thing that made me think that they we left in a soft state was

a) I could file the suckers easy enough

b) if they were heat treated or case hardened, I couldn't see them standing up to a hammering from the rockers for too long before they crack...

BUT

If as thd Doc has said they are stellite, then they would take it, and they wouldn't crack to easy either. Thats why I wanted to check Infact, out of queeeriousity,,, I might take a few different valves to work with me on monday and find out what I can about them.... me thinker is ticking like mad!!!!

<edit> Just picked up a book.... yeah, I'm gonna bet that they are stellite, its pretty common in modern valves... would make sense Doc

Nothing new about stellite- a tank rolling machine I looked after at Rheem had wear plates with 4mm of stellite hardfacing gas welded onto them.
Vintage? 1960.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R.

I've also had a valve on my engine wear like that. Sintered rockers also had a hole worn in them. This was only on 1 valve though and occured in less then 10,000klms with a few adjustments along the way.

Seeing as everyone is commenting on valve hardness, whats the possibility of a cheap valve being put in the batch?