Well Gareth ran the Pulsar D4R85 dizzy up on Ivan's `Vane' dizzy graph this morning.
Its tach doesn't work with electronic dizzys- so we hooked up a power timing light, set advance point zero at tickover (maybe 50 rpm) then spun it up to preset 2000 dizzy rpm and then preset 4000 dizzy rpm.
The D4R85 (manual) dizzy got 12* (at dizzy = 24* at crank) at 2000 dizzy rpm (= 4000 rpm at crank). Spinning it to 4000 dizzy rpm made no difference to the reading.
Corresponding figure for Gareth's D4R83 (auto) dizzy was 16* at dizzy = 32* at crank at the same speeds.
So the D4R83 (auto) one is close to a 1275S it terms of advance but it happens at 4000 rpm not 7000.
The D4R85 (manual) one is close to a 1275LS or 998 stock 45D dizzy, and is better suited to a well modified motor (like mine....)
It would need 8* more static advance than the auto one for the same max advance.
Clear as mud??
It would be nice to run one up on a stationary motor with degree wheel attached and a working tacho... or on a rolling road.
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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.