401/403 Values

[Geoff Dowdle]

Andrew ,

I agree with you on all points except "lowly" 85 series engines .
I ran a 100D2 engine in my 400 for about 18 years and sold this engine to
complete the restoration of a AC Ace Bristol for a friend . It was replaced
with a "lowly" 85A engine that was basically rebuilt to 405 spec (8.5
pistons , 405 cam , ported head with slightly larger inlet valves, 100
series oil pump and twin point distributor) .
On a dyno this engine produces about the same power as the D2 up to 4000 rpm
(2500 - 4000 is the rev range I use on the road) and is now a more pleasant
car to drive (or am I just getting older) .
Travelling in convoy with other Bristols with later 100 series engines the
"lowly" 85A engine performs as well or better .
I have a modified 85C fitted to my Frazer Nash Le Mans Rep Rep rebuilt with
sports cam , lightened flywheel , 100 oil pump , 8.2 pistons . It will rev
to 6000 rpm in the lower gears which gives a exciting ride .
There is certainly nothing wrong with a "highly" 85 series engine.

Sorry I don't have any spare valve gear but plenty of other spares new &
used.

Geoff Dowdle