Twin cam knowledgable in Cardiff.

[Bitsilly]

Please, please, can anyone suggest a person or garage around Cardiff who would know how to set the valve timing (MOP etc.) on a twin cam?
The engine is not in the car yet so ideally someone who can do a home visit!
Thanks in advance.

Ps I have the books but I cannot seem to get any agreement with reality from them.

[Andy8421]

There is lot of really good stuff on the net about cam timing, although it takes a bit of digging to find it. I am by no means an expert, but I taught myself enough about cam timing by watching Youtube videos and reading up on the subject to feel comfortable timing my twinc.

One of the problems is that there is a lot on nonsense out there as well, sometimes in books. Even the cam manufacturers publish conflicting information and can't seem to agree about specific timing data.

I assume you want to vernier / offset dowel time your engine to get it exactly right rather than just use the timing marks to get it to near enough? If so, I wouldn't give up on DIY, the information is out there.

[JohnMorin]

Ps I have the books but I cannot seem to get any agreement with reality from them.

Do you mean you can't get any agreement on the timing figures or the timing method.

I've done this a few times and it's not really difficult, just a bit fiddly.

John

[Bitsilly]

Both really.
If I just directly check what the dial/protractor says when the back inlet is max open it says 102, pretty much what the longer method of finding when it starts to open, finishes closing, add, halve, subtract one initial value etc.
But the exhaust valve always seems to come up with 285 directly, and other nonsense with the Wilkins method.

[JohnMorin]

What cams have you got?

[JohnMorin]

This is what you should get with Sprint cams

[2cams70]

One area the Miles Wilkins book does well is describe how to set the cams on the Twin Cam. You really don't need any other source of information.

[Bitsilly]

They are 420 cams.
I’ll check the dial against what I have,
All much appreciated thanks.

[Bitsilly]

Sorry Andy,
Yes I am trying to get them spot on using a selection of offset dowels.
Next time I’ll go straight to verniers!

[Bitsilly]

The latest figures are inlet mop is 102 (fine for me).
But ex mop is 131
Which is 25 too much, and should be moved five teeth!?

[JohnMorin]

Are you not getting interference between valves and pistons? I've encountered that with just two teeth out.

[Bitsilly]

Yes when I tried it so decided I’m doing something fundamentally wrong.

[JohnMorin]

So what are the cam timing figures you are working with, i.e.

Inlet opens: ?
Inlet closes: ?
Exhaust opens: ?
Exhaust closes: ?

[JohnMorin]

So what are the cam timing figures you are working with, i.e.

Inlet opens: ?
Inlet closes: ?
Exhaust opens: ?
Exhaust closes: ?

[Bitsilly]

I will start from scratch and post them asap