To all,
For any interested parties who dare to venture where fools fear to
tread, I will file this report, in hope it has some relevance.
Having installed a 1300 intake manifold and carbs on my 1500 engine
(mostly to at least appear original in a '63 Spitfire, I realized that
the jetting may be insufficient for the larger engine. Not having a
clue where to start, I contacted Moss regarding selection of jets for
the 1 1/4" HS2's. They were only helpful to the extent that they
referred me to "Mr. SU", (their term mot mine) Joe Curto who is in New
Jearsey.
Calling Joe Curto, I received the suggestion to try a #5 needle which if
I remember correctly, was used on an MGA 1600 engine. (Please no calls
to correct me on that). I installed them on the carbs but they did not
correct my immediate problem (which turned out to be a too much shaved
head). So I put the 1300 needles back in.
After solving the head problem and going through the break-in period, I
decided to re-install the #5's and see if it corrected my rather strange
power range that appeared to be carb. related. I did so and adjusted
the jets only a little bit to achieve the highest idle speed. I must
say, I was amazed how smooth the acceleration is and how the rough idle
suddenly stabilized.
One note on this: Not every 1500 is created equal and results may (and
probably will vary depending on a number of things, compression ratio,
Wear factors on engine and carbs, exhaust system used, etc.)
I hope this helps somebody, I could have used the info when I started.
Regards,
Joe Curry '63 Spit
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