I see a lot of ads for their use but has anybody used them on A Series?
Are they necessary to prevent roller rockers from wearing the top of a stainless valve stem (wear would be U shaped from the roller??).

Opinions and suggestions from my peers please

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'98 Mpi Sportspack + 7 port alloy head

I had a set of S/S inlet valves that got severely radiused by roller rockers in a very short time, so I would say, YES! Good idea.

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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.

Thanks again Doc. I'll measure the stems and have a look-see on the interweb.
Do you know of any stockists?
One small worry; is there the possibility they can come off?

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'98 Mpi Sportspack + 7 port alloy head

Maybe a dab of locktite could help the worry?

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1963 Morris 850 Smoke Grey
1963 Morris 850 Shadow Blue
1965 Morris Mini Smooth Van
1966 Morris Mini Van
1969 Morris Mini Deluxe Resto
5/72 Clubman Gt

They won't come off, think about it... the bits are all travelling in each direction, together. They are common on many more modern engines.

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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.

Thanks for putting that straight

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'98 Mpi Sportspack + 7 port alloy head

Lash caps are designed to rotate on the valve stem too so I wouldnt be using lock tight. They sre very unlikely to come off.

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The best part of fixing your mini is the test drive

Minis..

1976 van daily drive
1975 van
1968 deluxe in the shed
1967 deluxe high strung 1310
1959 austin healey sprite

Minibob - there are quite a lot of the 6mm valve set-ups for A-series which use lash caps. These are normally used along with valve retainer cap which is machines to allow snug fit for the lash cap.

The standard A-series valve stem is 9/32 inch, close to 7mm.

Thanks Carbon.
My understanding is that they go on the stem above the collett and are a push fit.
I can't go by standard measurements because the s/s valves are part of the alloy head I'm fitting. Will need to measure them.

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'98 Mpi Sportspack + 7 port alloy head

I did't know what lash caps were, found this after a google search, yeah they are probably a good idea.


http://ls1tech.com/forums/generation-iv-internal-engine/1509661-public-service-announcement-w-pics-lash-caps-important.html

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Nick

http://www.ausmini.com/forums/viewtopic.php?f=3&t=86675

Thanks for posting the pics, very interesting to see the damage caused.

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'98 Mpi Sportspack + 7 port alloy head

Regardless what was said in that LS1 forum, stock S/S valve stems are pretty soft. Good valves have hardened or stellited stem ends.

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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.

It was more of a what could happen, and more the photos showing, ignoring most of what they said. I assume that those pics are a good representation of what could happen?

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Nick

http://www.ausmini.com/forums/viewtopic.php?f=3&t=86675

Yank pushrod motors run a heap of valve spring pressure, they have to.
Never seen that sort of valve or cap damage on an A series though, worst case the end of the valve stem gets burred out a bit or gets a radius in it. Unlike most V8 motors,
A series valves don't spin, they are gripped tight by the collets. A+ triple groove collet ones can though.

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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.

Spent lots of time fettling the nissan/datsun L20B and they use lash pads. When the pad thickness starts to get over 5.5mm they can jump out in operation. The aftermarket alloy valve caps use a very deep pocked to retain the lash pad. I source from http://www.precisionshims.com.au/ in Melb, he's a nice guy (train spotter) and works out of his shed. Last set I bought was 8 different sizes to suit the rocket/valve wear (+- 0.01mm), they will suit whatever size you want. Changing the rocker pad geometry and integrating lash pads allows you to change the acceleration path of the valve sort of like re-profiling the cam without touching it.

Just started working on a 12G940, have a set of 6mm OE valves I'll be putting lash pads on. Will be fun clearing the hurdles.