hi, i have a b18 engine with a single carb zenith, this looks very similar to that of a s3 landrover, and on these engines thay are crap, is this carb ok on the 1800 engine? also the kind of running/milage/preformance differences are there between these two carbs? also witch manifold should i use, at the muinit i have the combo castiron one but i am worryed about it draining eficency.
Thanks, luke

If you don't like the Zenith-Stromberg there is nothing anyone can say to sway you. Burlein makes an HIF44 kit to swap it out if you want.
Single carb manifolds are restrictive. Much better performance will be realized going to either FI or a dual carb setup (most prolific are the dual HS6 setup). If you live where it is fairly cold (below freezing) a majority of the year you may want the later two-outlet combo iron manifold for the pre-heating properties. Otherwise a two outlet exhaust and aluminum intake are the way to go.

Mike!

What Mike said...

But note that the single-carb motors have a milder cam than the dual-carb motors, and you won't get much if any performance gain from converting without a cam change as well.

I have a 67 P210 that has the single Stromberg side draft(B18A), similar to the SU in concept. It is the original carb and hasn't been touched save topping up the dshpot in the 30+ years that Ive owned the car. I admit its a tad tempermental till it warms up, but after that its great...well, not great, but certainly OK.

I had forgotten that the camshaft was milder on the B18A and that dual carbs wouldnt go a long way to wake up that motor. Thanks for the reminder.

In time, the car will get a bored B20, to hopefully double its original 70hp. My orignial thought was to build a real performance motor with 42DCOE Webers and a "rallye" cam, but as I get older, my needs for performance seem to have waned. So I think a pair of HS6 SUs with IPD's street performance cam or equivalent will be the way I'll go, with a FI head. One of the biggest hassles with a P210 is its small gas tank, and not much room to go bigger, so a "really thirsty" performance motor doesnt seem like the prudent way to go...and being tall and narrow, it'll never be a car that handles well.

Bob Tescione