Morris Minor Owners Club

Hi,

I've just picked up a HIF 44 carb for Rosies rebuild and need help identifying which tubes are which and whether anything is missing (should there be a float chamber?)





Thanks

Philip

Float chamber is built in - hence Horizontal Integral Float. Pipe is fuel in, tube above is overflow, and the bit with the bolt jammed in is the connection to the rocker cover breather tube to help keep your engine fume-free! the manifold has a vacuum connection for a servo - plug it if you don't have servo. Good carb - but on the large side unless running a 1275 ?

Do these have to be run with the dashpot in an upright (vertical) position then as the float chamber is built in? The reason i ask is that i was thinking of fitting one of these to my 1275 marina engine but the manifold face is on an angle!

They work fine at a reasonable angle - that manifold (MG Metro) will fit straight on - but of course you need to cut the old inlet manifold off your existing item to keep the exhaust half - or buy a proper lcb type.

The manifold i have is the all in one cast item and it has the same exhaust exit angle as the standard minor one and has the 4 holes for the carb mounting, but at present only 2 are in use. It would physically fit fine, but i was worried about the angle! Thanks BMC. I knew if anyone would know, you would.

Thanks! I went for the HIF 44 as that is what WinSU suggested for the set up I've planned (also it was cheap and available locally so no postage costs). Have to admit I had no idea what the HIF stood for

Forgot to ask, is there a vacuum connection for the distributor advance?

WPR - that all-in-one manifold heats the inlet charge and so loses you up to 5 bhp. The alloy manifold above - which is not 'hot spotted' to the exhaust is far far better.
There should be a little tube sticking up just in front of the carb - between carb and manifold - that's for the vacuum connection. What is your planned set-up ?

Carburettor(s) : Single SU HIF44 (44mm / 1.75inch)
Engine type : A series (Mini/Metro/Midget/Minor)
Capacity : 1098cc (Morris Minor)
Gearbox type : Other 5 speed gearbox
Wheels/tyres : 14inch + 145/60R14

Engine details...
Air filter : K&N cone or similar
Inlet : MG Metro alloy inlet
Cylinder head : 1275cc head (standard)
Camshaft : Standard
Rockers : Standard
Exhaust system : Metro cast manifold + Medium bore (1-2inch) single-box
Ignition system : Standard distributor with opto/magnetic pickup and uprated coil
Cooling system : Metal 4 blade mechanical fan

Gearbox details...
Final drive : 3.5:1 final drive

Thats the list from WinSU which it claims should produce...

Performance analysis...
Power at flywheel (bhp) : 60.417
Power at wheels (bhp) : 46.884
Transmission loss (bhp) : 13.533
Torque (lbft) : 63.462
0-60mph time (secs) : 14.050
Maximum speed (mph) : 100.525
Transmission ratio (mph/krpm) : 17.727
Quarter mile time (secs) : 18.306
Acceleration (g) : 0.195
Power to weight ratio (bhp/tonne) : 79.080
Specific output (bhp/litre) : 55.025
Fueling constant (bhp/mmsq) : 20.000

Seeing as my plans are for a comfortable daily driver this should be enough (before anyone asks I'll also be improving brakes and suspension to cope with the extra power).

Seeing as my plans are for a comfortable daily driver this should be enough

Well if you are going 5 speed I assume you mean the sierra box if thats the case you should be sticking with a standard 4.2 diff ratio to get good acceleration normally 3.9 need a 1275 to push the extra gearing along or a tuned one for the rare 3.7 diff, where are you going to get a 3.5 from (wont be cheap) and if you are using a 1098 the performance is going to be quite pedestrian, I cant believe a 3.5 diff was reccommended for that set up for a daily driver a motorway cruiser perhaps, and no way is a 0-60 time going to be 14 seconds with that set up.

I am going with the sierra box, I may have misunderstood WinSU, 3.5 was got by 4.2 divided by 0.85 (5th gear ratio on the sierra box).

Thanks

Philip

Sorry you meant the final drive ratio of the gearbox and not the diff ratio as is normally quoted, thats OK then.

Normally in 4th the diff ratio would be the same as the final gear wouldn't it?

The carb is a bit big for a 1098 - I have a 38 HIFcarb with the same set-up you are considering. I goes very well - but 0-60 in 14 seconds is not likely (although I must admit I haven't attempted to measure it) - neither is 18 second 1/4 mile!!
Are you modifying the head before fitting ? Although the 940 head is very good to start with there is a lot of good work that can be done in the valve throats - inlet and especially exhaust to improve the gas flow. these are not as important on a 1098 as they are on a bigger engine - but every little helps.

To be honest I wasn't expecting the full performance that it claims, providing she'll get me to work and back without too much difficulty on the large hills I'll be happy! (If you know Dundee, I have the equivalent of the hilltown to go up every day).

Normally in 4th the diff ratio would be the same as the final gear wouldn't it?

Yes, so with the 5 speed box 4th will be 4.2

ok, good to know that.

BMC, I have fitted my HIF this evening and will give it a test run on the way to the SADMOG meet (18 miles) and see how it goes! Not too worried about every available BHP as long as it has enough to get me from A to B!! Thanks for the advice though, but at the moment any improvement that cost me more than £10 isn't in my budget!

It will work ok - just keep your eyes open for an MG Metro inlet manifold - mine were £5 each from ebay.
And yes - i know Dundee fairly well - did a couple of really good fast Autocrosses in Camperdown Park many years ago - and have often dragged a caravan over the Tay Bridge and then up to my favourite site at Montrose Beach!!

pskipper wrote:(If you know Dundee, I have the equivalent of the hilltown to go up every day)

if you go up it you must go down, so you could get your 0-60 in 14 seconds easy if your brakes cope very well on the hill at the moment then probably not too much to worry about!

You can see why I need a bit more oomph then I used to live on Main Street at the top of the hilltown and my poor little 1 litre polo struggled to get out of first going up it