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These are some specifications of distributors and equivalents that assist in setting up worn ones.

Whether the curves should be changed for modern petrol, driving conditions and modifications to the engine is open to discussion!

Anyone want to do an extensive trial on a dynamometer?

My take on this table is the max advance is 10 degrees (or 20 at the crankshaft) at 1300rpm.

This agrees with my dyno. reading of 21degrees. The extra degree is probably because it was running on 4 star rather than the pool petrol of the 50's.

 

Service number Model rot'n RPM 1 Advance1 1 RPM 2 Advance2 1 RPM 3 Advance3 1 no advance below years make models
40317A DM2P4 CCW 1300 10 650 4.5 500 2 250 1953-54 Jowett Javelin and Jupiter
40318B DVXH4A                 1954

 

Jowett Jupiter racing model
40571A DM2P4 CCW 1300 10 650 4.5 500 2 250     Jen's xmg258
40795A 25D4 CCW 1200 10 600 6 350 1 225 1961-74 Morgan, Triumph Morgan Plus 4, Triumph TR4A recommended alternative to 40ll5H and 40317A for jowett
40548A DM2P4 CCW 1300 10 650 4.5 350 0.5 250      
                         
40735 DM2P4 CCW 1200 10 600 6 350 1 225      

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