Larry,
HS4's are 1.5" carbs as used on MGB et.al.: To change them over to Midget use,
here is what you need to do:
- UK Spec manifold and linkage for Midget 1500 or Spitfire 1500 (The UK cars
never had the ZS carb). Don't get the 1300 manifold for HS2's. Get ALL of the
linkage.
- Heat shield for above
- New fuel bowls (different height) and rubber bowl spacers. (the MGB spec is
at an angle, the Midget is not)
- New needles (see O2 sensor below).
- Depending on your year exhaust manifold you will have to bung the openings
for the EGR valve and air pump. (I made a threaded brass plug), grind manifold
off to clear UK intake. Make spacers up (copper plumbing pipe) for intake to
exhaust mounts.
- The carbs will now be closer, center to center than the were on the B so you
will need to cut the cross shafts down or better yet get a UK spec set with the
manifold. The throttle levers have the spring return in a different place than
the B and you will need these for proper throttle return.
- New choke cable/handle - I just purchased the MGB one and located it down
next to the hood release.
- I also installed an Oxygen sensor in the exhaust stream so I could tune it
finer.
- Modify the body near the rear carb - BFH time - New motor mounts help here. I
found after I made the mods that I had plenty of room even without modifying it.
- K&N airfilters with offset down 1" or UK spec air filter.
Changed the character of the car completely! Best performance change you can
make for the 1500.
Cheers
Chris
>>> Larry Macy <macy@bblmail.psycha.upenn.edu> 12/05/00 12:23PM >>>
OK Pardon my ignorance, and my deleting a series of mails about what the HS4
etc designations mean. Is the HS4 the 1 1/2 inch variety?? The reason I ask
is I may have a set of 1 1/2 inchers for nearly free. Not sure yet then I
have to get a manifold.
Larry
At this exact moment in time 12/4/00 10:09 PM, "Trevor Boicey"
<tboicey@brit.ca> made the profound statement:
> Nolan Penney wrote:
>>> I was thinking of trying that with my 1500, but the stock manifold for a
>>> 1500
>>> was for the Zenith Stromberg carb. What kind of manifold can you use on the
>>> 1500 to fit SUs onto it?
>>
>> Get the intake manifold of an earlier Spitfire engine. If I remember right,
>> you
>> can go all the way back to a Mk II Spitfire manifold, and have it bolt up to
>> a
>> 1500. The earlier engines ran dual SU's, as did 1500's from countries other
>> then
>> the US. The 1500 SU's are the bigger ones.
>
> While the above would work, for the 1500 you probably should
> get the real carb set for the 1500, which is dual HS4s on
> a larger manifold. (compared to dual HS2s on a smaller manifold)
>
> The carbs are not hard to get, use the internet to find
> a UK junkyard.
>
> Consider you are probably seeking more performance, this
> is the only way to go.
Larry Macy
78 Midget
Keep your top down and your chin up
Larry B. Macy, Ph.D.
macy@bblmail.psycha.upenn.edu
System Administrator/Manager
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 1015 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a
question and you're a fool for the rest of your life.
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