[Healeys] HS4 Tri-carb tuning

Bob Spidell bspidell at comcast.net
Mon Jul 6 21:36:25 MDT 2020

Do you have a Colortune?

On 7/6/2020 7:07 PM, John Spaur via Healeys wrote:
> Bob, raising the piston 1/32” is not my issue. I am wondering why the 
> engine stalls when the center carb piston is lifted all the way up and 
> the others don’t stall the engine when lifted all the way up. I sent 
> another post with a link for that. The carbs are well synced, I used 
> the S.U tuning kit to check the piston lift and they are spot on.
> *From:* Healeys [mailto:healeys-bounces at autox.team.net] *On Behalf Of 
> *Bob Spidell
> *Sent:* Monday, July 6, 2020 6:32 PM
> *To:* healeys at autox.team.net
> *Subject:* Re: [Healeys] HS4 Tri-carb tuning
> 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 1/32" thick
> 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”.
>     TIA,
>     John
>     San Jose, CA

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