[Healeys] HS4 Tri-carb tuning
bspidell at comcast.net
Mon Jul 6 19:32:21 MDT 2020
After much effort and consideration, I decided there must be some Brits
who wrote that 'procedure' laughing their asses off knowing there is no
practical* way to lift the pistons exactly 1/32"
* But you can, if you have the little wire thingies in the poor man's
tuning kit--actually quite useful--stick the wire thingies in the piston
and gauge the piston rise; the wires themselves are pretty close to
On 7/6/2020 3:39 PM, John Spaur via Healeys wrote:
> I installed three brand new HS4 carbs on my BT7 this weekend. They
> seem to work really well with no load and light load on some very
> short test drives. The jet adjusting nuts are very close to what the
> old ones were set to. One of the tests is to lift the piston with the
> lifting pin as far as you can. That is supposed to stall the engine.
> However, this only works on the center carb. When I test the front and
> rear, it just slows the engine down a bit. What have others found when
> they do this test? BTW, I can hardly tell a difference in the engine
> speed when I lift the pistons 1/32”.
> San Jose, CA
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