SU Carburettor Explained - Everything you need to know (and possibly more)
ฝัง
- เผยแพร่เมื่อ 30 ต.ค. 2019
- An overview of everything you need to know about the SU carb.
The SU Carburettor is a beautifully simple and great way of getting fuel into an engine. Used in cars all the way up until 1993, these carbs are simple, reliable yet often misunderstood.
How to Tune the SU: • How to Tune SU Carbure...
Support the channel: / livingwithaclassic
Follow on Instagram: / living_with_a_classic
Business contact: livingwithaclassic@gmail.com
Music used: Dancing Hearts - Anders Enger Jensen • Dancing Hearts
#su #carb #carburetor
I went from not knowing enough to feeling like I could teach someone else about these carburettors. Thank you.
When anybody could fix their own car . Mind you, you had too quite a lot .
One detail he might have mentioned, although I guess that really goes under 'tuning', is that the viscosity of the oil in the dashpot determines how rich the fuel mixture is when you accelerate. Most of the time 15 wt oil is what you want. "Marvel Mystery Oil" is perfect.
As the fella said to me when he sold me my first LBC [''61 Sprite] 'The closest thing to fuel injection'
No mention of how vacuum in the bell chamber rises the piston to increase the size of the venturi allowing more air/fuel into the motor while maintaining high air velocity and atomization at the discharge jet, there is a small orifice in the bottom of the round slide that is the top of the venturi and this is how low pressure is created in the bell ....
Very few people know what SU is an abbreviation of.
MG Midget owner and I love these caburettors. I am not a mechanic but I can fool people when I fix these things. English cars are easy to work on once you forget all your habits you learned working on American cars. Very simple but very different.
I've seen some SU's with a jet lever, what are they for if someone can help me
You have NOOOO idea how badly I needed to see this video! Have a '71 RR Silver Shadow that wouldn't start. This video explains everything! Thanks!
Hi Good video I may have got the dash pots mixed up on the Mk 11 How can I check if the right ones are on the carbs Mike
Great video. Thank you
Thanks, really, really appreciate it. I'm bringing a 1970 Datsun 240z back to life after a 30+ year hybernation and this has really been helpful.
The purpose of the damper is to slow the rise of the piston on sudden acceleration, to give an initially richer mixture, like the throttle pump on fixed jet carbs. It does NOT restrict the fall of the piston, if held up then manually then released it should drop with a sharp click.
Buddy, you are killing me here! Every time I turn on my computer there you are with another lesson.
There is another often overlooked little item on those carbs: it is the damper piston cap. There are 2 versions available, with a little hole on the top and without. Now there are also 2 versions of the „bell housing“, with a little „fin“ on the top and without. Now these items are very important to vent the piston when moving up BUT the 2 versions mentioned above must not be mixed, that means if you have the version with the fin on the bell housing check inside the top throat and see that there is a hole drilled and it should be clean and with this version bell housing you must use a damper piston cap WITHOUT the hole!!! Otherwise if there is no fin with that venting „fin“ than you must use a cap WITH the hole. Those 2 Versions get mixed up a lot since people replace those dampers over the years and use the wrong one thereafter, sometimes they just replace them to get a brass top because it looks nice and shiny but get the wrong type.
Great video! Very clear explanation and demonstration of how these carbs work. Thank you!
Best explanation of how an SU carb. works I 've seen so far. A lot of general information on carbs tends to be about the US designed Holley and Carter designs rather than these British designed carbs. Thanks for sharing here, regards from Australia.
Man you have saved me. I just bought my first Rover, a 3500S and these carbs completely baffled me. I spent hours looking at them yesterday trying to figure it out. I finally get it because of your video. Thank you so much!!!
What a great video ! These carbs have been a mystery to most people and your video proves how simple and sensible they are. Thank you!
Very very useful. I've got a '91 Mini that I'm in the process of preparing to take the engine out, and figured it was about time I understood exactly how the carb worked... And now I know...