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Post by dave1800 on May 10, 2015 11:31:04 GMT
I would be very grateful if someone could advise me of the minimum clearance beween the HS6 suction chamber and the case of the standard single carb air filter. I am trying to make something that needs to fit over the the suction chamber. It would also be helpful to know how far down the chamber (from the bottom of the neck) this occurs. I am looking for at least 6mm or I will need to change the design. I recall it is quite tight but cannot remember exactly.
Many thanks
David
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Post by Penguin45 on May 10, 2015 13:21:45 GMT
 That what you want? 9mm to the flange. Chris. |
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Post by dave1800 on May 10, 2015 13:54:31 GMT
Yes, thanks Chris. I did recall it was very tight - does the base of the air filter case actually get any closer to the suction chamber than the 9mm you have indicated?.
I'm having a go with a 3D printing program and hoping not to mess up as the printer rental isn't cheap. Now I have a SU HS6 to play with there's a whole series of measurements and I want to make sure I have covered all the clearances. It looked straight forward before I examined the carb closely.
regards
David
That what you want? 9mm to the flange.
Chris.[/quote]
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Post by Penguin45 on May 10, 2015 16:20:08 GMT
 Hmm - that's tight - about 7mm I'd say, but the gap opens vertically. Chris. |
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Post by dave1800 on May 11, 2015 0:06:39 GMT
Many thanks Chris, that's really helpful and makes life a lot easier for me. Regards David Hmm - that's tight - about 7mm I'd say, but the gap opens vertically. Chris. |
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Post by dave1800 on May 26, 2015 6:05:26 GMT
While rebuilding the HS6 I noticed that the nylon tube that carries the fuel from the float chamber to the jet was looking pretty tired and discoloured. Sure enough after just a bit of flexing it broke completely in two. On examination the nylon had gone hard and brittle. Not really surprised.
This could occur when driving and spill large quantities of fuel all over the hot manifold. Most likely when operating the choke but could be any time and at the very least immobilise the car. The "O" ring seal in the float chamber was also perished. Well worth checking as the new jets are not expensive from Burlen if you don't fancy doing or don't need a complete carb overhaul.
David
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Post by tommydp on May 27, 2015 21:32:45 GMT
Very true, Dave!
It's wise to check for leaks there, as you don't want petrol dripping on to the exhaust. Also, I've experienced a kink developing on the tube, caused by choke movement I guess. This can restrict flow of petrol from float chamber to jet, with obvious results. The thing is you won't see this unless you push the insulating piece, which goes over the nylon tube, away. As the nylon tube is hidden, I'm sure many people are chasing ghosts all around the carb and engine to find the fault, while the kink in the nylon tube is hiding there:-)
Regards, Tommy.
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Post by dave1800 on May 28, 2015 11:53:05 GMT
Thanks Tommy. I was going to replace the jet (and needle) anyway and the seal where the pipe fits in the float chamber was destroyed by someone not fitting the pipe correctly (and age). Moss Video Installing the jet pipeThis carb has been sitting in the back of a garage for around 20 years or more and is in quite good condition with no play in the throttle shaft.Now I have managed to undo the jet bearing nut the needle has centred perfectly. I took off the adjusting nut and spring so the jet engaged with the shoulder of the needle before locking the jet bearing nut. As you say you have no idea of the state of the nylon tube as it is hidden, and I imaging the kinking could be difficult to diagnose and more likely on an old jet assembly where the nylon has lost the necesay flexibility to operate the choke - before cracking and spilling fuel over the manifold. David |
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