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MG MGB Technical - static timing

Have a static timing question...and need the experts to ste this one to rest...Is it 10 or 6 BTDC static on my 74 mgb?...It's date of mgf is 10.73 and its a de-smoged all original with a 25d-41491 dizzy...The marked dynamic value is 11 BTDC at 1500rpm...and Haynes suggests 10 static...while all my reading on line suggests 6 BTDC static...I suspect its 6 BTDC static if the dynamic is 11 BTDC at 1500 rpms...Please comment, thx...
Pete

Leyland Workshop Manual says 10 degrees for 72 model year cars, 6 degrees for 73. However 72 model year cars have the 41370, and 73s have the 41491, which is perhaps where the confusion has come from. So 41491 is 6 degree static.

But you would only be using static if you don't have a timing light, dynamic timing renders static timing uneccessary, except possibly for diagnostic purposes. 41491 has 11 degrees at 1500 rpm, 41370 16 degrees.
Paul Hunt 2

Ah...a definitive source!...Thank you kindly Mr. Hunt...I will amend this evening...I pulled the dizzy and replaced the vacuum capsule and want to get all back to normal...thx
Pete

My pleasure. Did you check the new capsule before fitting by sucking on it and making sure it moved, but didn't pass any air? I'd strongly advise it - Hunt's Fifth Law clause 2: "New parts can be faulty when you receive them".
Paul Hunt 2

Yes indeed...my dad was an old school mechanic...and taught me to approach new parts with caution...It did articulate and I even aplied a mild continuous vacuum to make sure...I set 6 btdc last night and all seems very fine...thx very much...
Pete

A capsule passing air? Fairly bawdy group here.
J.T. Bamford

Then I will avoid any discussion of greasing our nipples JT...
James

This thread was discussed between 02/07/2007 and 11/07/2007

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