is this the right carb for a 948

Post by **bmcecosse** » Sun Oct 18, 2009 11:28 pm

Other options would be Supercharger or Turbocharger - blowing into that hopeless manifold! They could suck through the oil bath too - although it would need to be repositioned slightly........

Post by **PSL184** » Sun Oct 18, 2009 11:31 pm

Supercharger is fairly straightforward to fit. I'm thinking the Merc C class jobbies look nice and compact and can be got for about £100 second hand or £250 new.....

Post by **bmcecosse** » Sun Oct 18, 2009 11:35 pm

Yep - would boost the power by ~100%, for a while - and the insurance premium by ~ 500% for ever!

Post by **andrew.searston** » Mon Oct 19, 2009 5:25 pm

if i change it to a hs2 carb will i be able to keep the throttle spring in the same position as it is now??????????
and is it a strate swop????????

Post by **bmcecosse** » Mon Oct 19, 2009 5:31 pm

Doubt it - there isn't usually a throttle spindle extension on that side - in fact -throttle cable usually goes on that side. It will fit the manifold - but that is the worst manifold - the later 'one piece' manifolds are slightly better flowing - but still have the power zapping 'hot spot'. Just tighetn up the jet gland on your carb and it should be fine. In extremis - get an 'overhaul kit' from Burlen - which will have all new seals/washers etc.

Post by **andrew.searston** » Mon Oct 19, 2009 5:45 pm

so i cant keep the throttle spring where it is???
does that mean making a bracket???
and does anyone have a pic of a hs2 carb on the car???

Post by **bmcecosse** » Mon Oct 19, 2009 6:02 pm

Spring usually goes other side - and down to a bracket on the exhaust clamp. It's a while since I worked with these ancient carbs - but if my memory serves me right (highly unlikely I know!!) the throttle opens the other way on the early carbs?? Part of the redesign to HS type included a realisation that it worked better if opening the other way round!

Post by **andrew.searston** » Mon Oct 19, 2009 6:04 pm

i might just stick to the original carb

Post by **bmcecosse** » Mon Oct 19, 2009 6:08 pm

See josh's thread - with picture of car/manifold etc/ Yes - just sort your carb - it's easy!

Post by **andrew.searston** » Fri Oct 23, 2009 5:32 pm

ive been told that a hs2 carb would not reach the oilbath air filter is this correct???????
and is their a way round it?????

Post by **mmjosh** » Fri Oct 23, 2009 5:47 pm

the throttle is in the wrong place on a hs2 for a start

Post by **andrew.searston** » Fri Oct 23, 2009 5:54 pm

i dont mean that josh i can get round the throttle
i mean the distance between the manifold and the air box down piece.
will it fit???????

Post by **bmcecosse** » Fri Oct 23, 2009 5:57 pm

Why would it not? It bolts to the carb - wherever the carb sits!

Post by **mmjosh** » Fri Oct 23, 2009 5:58 pm

it looks a bit like the 803 carb i think it will fit to the hs2

Post by **bmcecosse** » Fri Oct 23, 2009 6:00 pm

Exactly!

Post by **andrew.searston** » Fri Oct 23, 2009 6:04 pm

the down piece that holds the air filter up might be at an angel and not make a seal if the body of the carb is to small
is their a difference in the size of the carb body between the two????

Post by **bmcecosse** » Fri Oct 23, 2009 6:05 pm

Not any significant difference - that's the least of the worries!

Post by **mmjosh** » Fri Oct 23, 2009 6:06 pm

ont worry about that it will probably fit

Post by **andrew.searston** » Fri Oct 23, 2009 6:07 pm

why is their anything to worry about
ive sorted the position of where the spring will go and how it will bolt on
what about the cables can i keep them the same??????
and have i missed anything?????

Post by **bmcecosse** » Fri Oct 23, 2009 6:10 pm

As I said - very possibly the throttle has to open opposite direction ? Can't remember now - it must be 40 years ago!