How the SU carburetter works - Part 1

[@CheekyOllie]

Never understood how the piston was pulled up. Now I do!!! Good video. Thanks

[@rayshortall588]

I do like your clearly explained videos. I've been in this game for a long time,but it does no harm to listen to the whys and wherefores . By the whey, I've throne away more than enough perfectly good wax jets in the past!

[@Goose_from_Norway]

Extremely interesting video, AC. The SU is an ingenious contraption and a beautiful piece of engineering. Thanks for a great video👍

[@davidgerrard8661]

Excellent, thanks

[@keithoftheshire2805]

Clear and concise quality information.....👍

[@mr.buttons8486]

Thank you very much Sir🙏

[@philhuggett4776]

Im enjoying my home tutoring 😁 So interesting. Thanks AC

[@mcmotors100]

Great video 👍I’d love you to explain how the Hif choke works? Thanks.

[@sfraser12]

Great video thanks

[@Hipyon]

Nice one Constant depression carburettors are beautiful things And you mentioned the importance of the crankcase ventilation👍 it is positively dangerous to disconnect it Carbon monoxide isn't friendly

[@ACDodd]

I would not say it was dangerous but it’s most definitely not healthy for you.

[@deancook2377]

Thank you for the presentation; do you use the wax jets on twin HS2's as well?

[@ACDodd]

That’s a good question, and no is the answer

[@pablojimenez8329]

Great video! If I’m understanding well, the momentary enrichment of fuel when opening the throttle happens because the RPMs go up faster than the piston goes up (because of the delay effect caused by the damper), thus the air velocity momentarily increases because the open cross section in the carb body is still small (piston still down) causing a higher Venturi effect in the jet-needle?

[@ACDodd]

Yes

[@demiquadfpv3333]

Great video, one of the most confusing things learning when a piston flys up (thin oil etc) it leans, which I'll admit was not what I used to think due to thinking the needle was pulling out and therefore must be enriching. As a side request you once did a videos with a weight (lay shaft I think) to show approximately the drop speed on a carb, would you be able to show that test on this hs4 please?

[@ACDodd]

Use the same test. It’s only starting point, and still maybe miles out for your actual car.

[@kathysarmcandy1992]

You do do some pretty units. Is that some satin clean on the body?

[@ACDodd]

No.

[@kathysarmcandy1992]

@@ACDodd I was kidding. 🤟 Are you using a tumbling media for body cleaning?

[@ACDodd]

@ no tumbling

[@martinhibbert1428]

Does the float chamber need to be mounted with a rubber mount between it and the carb body ? I was always under the impression that if they were mounted solidly then vibration could cause problems with the fuel supply.

[@ACDodd]

Only rubber mounted on the twin carb models, can’t say I have ever seen an issue on the single carb applications using a solid mount.

[@martinhibbert1428]

@ That’s interesting, never knew that. Both my cars are twin carbs and it’s 30+ years since I have owned a mini so don’t recall how the float chamber was mounted.

[@stuwhite2337]

Do you prefer hs or hif as a general rule?

[@ACDodd]

HIF is a better carb full stop.

[@stuwhite2337]

@ACDodd Thanks. From what I read a lot of people seem to want to swap from HIF to HS, at least on MGBs.