BDR Cosworth Cams fitted in 1987 - What were they? What spec? 290 degrees duration? SOLVED

[anthony1956]

Reason for this consideration is here https://www.caterhamlotus7.club/blogs/entry/1052-bdr-wiring-ballast-resistors-and-types-lucas-43d-distributor-blanking-plate-pertronix-electronic-ignition-and-coil-covertly-damaged-dizzy-cap-no-spark/

=====================================================================================================================

Solution: 

They will be BD3 profile, 290 degrees , 8.83mm lift, lobe centres 110/110, lift at TDC 1.95mm, 1.75mm, valve clearances .010”/.010”.

thanks oilyhands

 

=====================================================================================================================

Need data for vacuum advance curve if I change the dizzy from 43D to 45D (difference respectively being absence or presence of vacuum advance)

Anyone know? 290 degrees duration?

Anthony

supplementary question is how do I check it, .. or even not check, but measure it myself

Edited August 1 by anthonym
Link to summary

[oilyhands]

They will be BD3 profile, 290 degrees , 8.83mm lift, lobe centres 110/110, lift at TDC 1.95mm, 1.75mm, valve clearances .010”/.010”.

[anthony1956]

A complete and perfect answer, thanks Dave. Perchance do you have instructions on how to check all those numbers?  http://www.dvapower.com/kengine

Edited July 31 by anthonym