Hello Chris,
Wednesday, January 09, 2002, 8:54:24 AM, you wrote:
CK> I've been doing a lot of research round the web on 1500 carbs. Basically,
since my '79 engine needs to come out at some point to go into the new shell,
I'm planning on poking around a bit inside,
CK> probably checking the rod and main bearings, replacing the thrust washers
(even though they are still in place, it just makes sense with the engine out.)
Compression seems good (last I checked, I
CK> don't remember the numbers offhand), though the car does have the 7.5:1
pistons. I'm also planning on ditching a lot of the smog equipment.
CK> So, I'm looking at cheap ways to get more oomph out of the engine. One way
iscarbs, and I'm looking at several options, and I'm looking for the list's
collective wisdom on what you've tried and
CK> what works.
CK> 1.5" sigle carbs
CK> A. ZS 150CD4T This is what's on there now. Runs rough until warm, but
probably needs valves adjusted, timing set, etc. Autochoke may be stuck open,
and I've heard that these are a real pain to
CK> get working right.
CK> B. ZS 150CD manual choke. I picked up for $40 a ZS 150CDSE from Ebay -
turns out to be the rear carb for a '71-'72 GT6. With the right needle it'll
probably work OK. But no extra oomph.
CK> C. SU HS4. Someone on one of the other MG BBS's uses this in plsce of the
ZS. He used an MGA needle in it (don't know which MGA needle, though).
Advantage is that they're somewhat simpler than
CK> the ZS. But it's still a 1.5" carb.
CK> 1.5" Dual Carbs
CK> A. dual HS4's. A few of you I know have converted to these. How do they run
with a US dizzy and 7.5:1 pistons, if you're set up that way? Sourcing the
manifold doesn't seem to be the easiest
CK> thing, though...
CK> 1.75" single Carb
CK> A. ZS 175 CD, from MGB. Advantage, it's bigger than the 150CD.
Disadvantage, it's still a ZS!
CK> B. SU HS6 or HIF44. Advantage, bigger venturi, not a ZS. Disadvantage, what
needle to use?
CK> Weber DGV
CK> I know some of you have Webers and like them. They seem easy to set up. But
they're a little pricey, given the other things that the Midget will definitely
need.
CK> So if you've read this far, what say you all? Any pearls of wisdom? :-)
CK> TIA
I have converted my 1500 Midget to dual SU4 and it is much better then
the ZS that I had on the car. Of course the ZS was old, worn, and the
had my doubts about the choke. The car seems a bit faster, and it is
much easier to start, hot or cold. Finding a manifold was not easy.
I can check my records and see who sold me the manifold.
I like it better than the ZS, but YMMV. Not sure about a single carb
but there is a guy (I don't remember who) who can convert your single
ZS manifold to a single HS44 manifold. Thing will still have the
really sharp bends, but I suspect it is a better choice.
--
Best regards,
Bill mailto:w.gilroy@verizon.net
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