Rene van Maanen wrote:
> Does someone know what the number of degrees is that the
> vacuum advancer creates for the ignition?
>
> It's a 25d4 advancer distributer on a 68 B.
Rene,
Here is info that Kelvin posted awhile back ...
> MGB Dist# Vac.# Vac.Adv. Type
>
> 18GF 40897 54411230 5.13.10 ported
> 65-67 41288 54411985 5.13.10
> 67 41290 54412170 5.11.7
> 68 41288 54411985 5.13.10
> 69 41264 54415625
> 70 41288 54411985 5.13.10
>
> 71 18GK 41339 54414868 7.13.5 manifold
> 72 18V 41370 54423989 7.13.3
> 73-74 41491 54425359 10.15.5
> 75 41599 54425516 10.15.5
>
> Note the change in advance characteristics in 1971.
> The later units come in at a higher vacuum and gives
> less advance.
>
> 10.15.5 = Movement starts at 10 ins of Mercury
> Movement stops at 15 ins of Mercury
> 5 distributor degrees advance at maximum movement
>
Hope this helps ...
**********************************************************
Safety Fast! ... larry.g.unger@lmco.com
'61 MGA 1600 MkII
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