Quantum Mechanics has the UK spec HS4s with linkage, manifold and CapStat jets
for under $200 as is. He also has the exhaust manifold for 65 or 70 (if memory
serve correctly, I didn't buy the exhaust manifold). Don't you have a header?
He imports them off junkyards in the UK.
The stock '78 overflow mount can be used, just connect the rear mounting point
of the overflow holder to the front hole on the frame. I didn't connect the
front mount on the overflow. Moves it up just enough to clear the carbs, but
not interfere with the '78 radiator.
Larry Macy <email@example.com> wrote:
> That sounds reasonable. Now if I can get the carbs I can sell them on eBay
to pay for the right SUs and manifold ;-). And have enough left to buy 2 new
At this exact moment in time 12/5/00 2:33 PM, "Christian Stanton"
made the profound statement:
> Oh yeah, I forgot...you also have to relocate the expansion tank forward a few
> inches. (just fabricate a short bracket)
> I actually did mine for about $150 (not including the carbs, which I already
> owned) and about 20 hours total time (not including just standing there and
> staring at the carbs)
> See also Trevor's web site for pix. (mine is a little cleaner looking (sorry
> I would suggest that you DON'T EVEN TRY to fit MGA carbs into the Midget as
> you will have to also replace the choke levers (later HS4's have a shaft) and
> the fittings are all banjo fittings. I found that with the Carbs off of the
> '70B, that with the existing UK spec pollution control (just a carbon
> absorbtion canister) I could hook up all of the appropriate vacuum and fuel
> vent lines properly. This would me next to impossible with early carbs.
> If I were you, I would get the whole kit from a UK breaker (carb, linkage,
> aircleaner) and then rebuild the carbs. Bolt it up and drive!
> Chris Stanton
>>>> Larry Macy 12/05/00 02:16PM >>>
> These carbs are actually off a 1500 MGA. But the below description is pretty
> helpful, thanks Chris. Now all I gotta do is talk the current owner out of
> them for a reasonable price. ;-) Oh and find a manifold, and modify the
> linkage, and ................
> At this exact moment in time 12/5/00 1:02 PM, "Christian Stanton"
> made the profound statement:
>> HS4's are 1.5" carbs as used on MGB et.al.: To change them over to Midget
>> 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
>> - 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
>> 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
>> 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
>> 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
>> - 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
>> - 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.
>>>>> Larry Macy 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.
>> At this exact moment in time 12/4/00 10:09 PM, "Trevor Boicey"
>> made the profound statement:
>>> Nolan Penney wrote:
>>>>> I was thinking of trying that with my 1500, but the stock manifold for a
>>>>> was for the Zenith Stromberg carb. What kind of manifold can you use on
>>>>> 1500 to fit SUs onto it?
>>>> Get the intake manifold of an earlier Spitfire engine. If I remember
>>>> can go all the way back to a Mk II Spitfire manifold, and have it bolt up
>>>> 1500. The earlier engines ran dual SU's, as did 1500's from countries
>>>> 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.
>> 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.
> Larry Macy
> 78 Midget
> Keep your top down and your chin up
> Larry B. Macy, Ph.D.
> 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.
Keep your top down and your chin up
Larry B. Macy, Ph.D.
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.