AJP valve shims

[TwinKam]

Jhonno said:

TwinKam said:

That is the least important of all the dimensions!... but, out of intetest, I've just measured a few from my collection and they are there or thereabouts, varying from 2.5 to 2.6mm

How so?! I have 16 shims I don't know the thickness of.. So I need to know what the depth of the pocket is, so I can work out the thickness of the shim!

Measure the actual shim part, that's the bit that matters! Won't your micrometer anvil fit into the recess? (If not, use a ball bearing as a known size spacer) I then write the size on the top of each shim with a sharpie.
I think you will find the overall height of shims varies somewhat because as I said, it is not critical.

[Penelope Stopit]

TwinKam said:

Penelope Stopit said:

Is there any chance that these are called lash caps rather than shims? I've found some lash caps at websites I've previously visited when looking for shims but the prices are high
Perhaps you have time to search for lash caps

'Lash' (amongst other things) is American for 'free-play' or 'clearance', so yes, I could imagine them being called that.

I thought so but wasn't sure
Cheers

[Jhonno]

TwinKam said:

Jhonno said:

TwinKam said:

That is the least important of all the dimensions!... but, out of intetest, I've just measured a few from my collection and they are there or thereabouts, varying from 2.5 to 2.6mm

How so?! I have 16 shims I don't know the thickness of.. So I need to know what the depth of the pocket is, so I can work out the thickness of the shim!

Measure the actual shim part, that's the bit that matters! Won't your micrometer anvil fit into the recess? (If not, use a ball bearing as a known size spacer) I then write the size on the top of each shim with a sharpie.
I think you will find the overall height of shims varies somewhat because as I said, it is not critical.

I've found my micrometer now.. So I can just measure the thicknesses..

[TwinKam]

What were you using before, a wooden ruler?

[Jhonno]

1/2 my 30cm ruler from school..

[Mr Cerbera]

Jhonno said:

1/2 my 30cm ruler from school..

[Wolvesboy]

So..... which gap is the correct one to use for the Inlet and Exhaust as two different measurements seem to be bandied about!

Another point - anyone tried removing the shims without removing the cam? Is it possible on the AJP if the valve kept open and the resulting gap exploited to remove the shim?
I am also a little concerned that there don't seem to be any timing marks anywhere - most unusual! TDC can obviously be worked out but surely there must be some timing marks somewhere?

[spitfire4v8]

The tvr valve setting was 8in10ex and it was me who first suggested around 18/20 years ago using 10in12ex as the valves only ever close up and once they start going closer than 6thou it impacts on the slow speed running quite considerably. The extra 2 thou clearance seems to have no impact on the life of the cams or the followers.
There's no timing marks as std.

[julian64]

spitfire4v8 said:

The tvr valve setting was 8in10ex and it was me who first suggested around 18/20 years ago using 10in12ex as the valves only ever close up and once they start going closer than 6thou it impacts on the slow speed running quite considerably. The extra 2 thou clearance seems to have no impact on the life of the cams or the followers.
There's no timing marks as std.

Hi jules. I thought it was you who eventually said do them equal because that s where you have found the best power, or am I imagining that?

[TwinKam]

julian64 said:

spitfire4v8 said:

The tvr valve setting was 8in10ex and it was me who first suggested around 18/20 years ago using 10in12ex as the valves only ever close up and once they start going closer than 6thou it impacts on the slow speed running quite considerably. The extra 2 thou clearance seems to have no impact on the life of the cams or the followers.
There's no timing marks as std.

Hi jules. I thought it was you who eventually said do them equal because that s where you have found the best power, or am I imagining that?

I think the 'equal' bit refers to the timing, not the valve clearances, ie equal lift on exhaust and inlet (followers level or 'equal'...) for cam timing purposes.

[julian64]

TwinKam said:

julian64 said:

spitfire4v8 said:

The tvr valve setting was 8in10ex and it was me who first suggested around 18/20 years ago using 10in12ex as the valves only ever close up and once they start going closer than 6thou it impacts on the slow speed running quite considerably. The extra 2 thou clearance seems to have no impact on the life of the cams or the followers.
There's no timing marks as std.

Hi jules. I thought it was you who eventually said do them equal because that s where you have found the best power, or am I imagining that?

I think the 'equal' bit refers to the timing, not the valve clearances, ie equal lift on exhaust and inlet (followers level or 'equal'...) for cam timing purposes.

Yep that's right.