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| macdaddy86 |
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macdaddy86
L Plate Warrior
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Nobby the Bastard
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macdaddy86
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 Posted: 20:53 - 22 Oct 2016  Post subject: picture of the 12v valve |
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Just thought id add a picture of the 12v solenoid valve i intend to use also  |
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macdaddy86
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macdaddy86
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| kramdra |
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kramdra
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Robby
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macdaddy86
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| WD Forte |
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WD Forte
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kramdra
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| Posted: 23:29 - 22 Oct 2016 Post subject: |
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Any decent quality solenoid is not going to fail, you do not need a backup. Possibly if you run out of juice it will prevent bump starting, but most modern bikes recommend against it for fear it will fuck the regulator.
Have serviced my vac tap, worked for a year, now is always on. The manual tap part is also dodgy, it is only off in the very centre of the off position. Good thing my floats do not intermittently piss fuel, but I'm aware they could at any time and I probably wouldn't notice.
Solenoid valves are generally made to a higher quality, example of which being brass body rather than die cast zinc  |
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| Teflon-Mike |
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Teflon-Mike
tl;dr
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| Posted: 07:37 - 23 Oct 2016 Post subject: Re: one pipe |
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As others; that is massively over convoluted.
Tell me, do you spend longer getting kitted up to ride anywhere than riding there? Because that is displaying an AWFUL lot of belt braces and must have spare shoe laces too, 'thinking'.
'Yes', your schematic looks like it could work... it just doesn't need to.
The reason for a vacuum petcock is simply so that if the bike is knocked over, the carburettor float doesn't let petrol over flow and cause a fire risk.
| macdaddy86 wrote: | I've heard that it can flood the carbs and cause hydrolock and/or mix with the oil etc if the float fails? |
I don't know who you have been listening to, there's some seeds of truth in there, but?
| macdaddy86 wrote: | basically wreck your engine beyond repair. |
Possibly.. but incredibly unlikely.
Vacuum petcocks are an innovation that have really only been about since the 1980's, and even then they weren't common. In forty years, I don't think I have EVER come across anyone who has wrecked an engine from not turning off their petrol tap.
I've woken up to a puddle of petrol under the bludi-guzzi, on many an occasion though! As our Snowie isn't in the habbit of turning taps off, and she always forgets that bike has two, AND it's a bluddi-guzzi, with notorious Del-Awful carbs, that give four opportunities to piss petrol, from either of the sticky choke valves and or either of the sticky float bowls!!! Most dire consequence of the matter, has been the damn thing running out of petrol!!!
YES, gross flooding, could, see neat fuel wash into the inlet tract and into the cylinder.... BUT...
You have to have more than 'one' failure for that; first the vac tap has to effup. Next, your carb float has to jam open. THEN, the float bowl over flow has to fail to vent the over flow. THEN, the engine has to have 'stopped' on the induction stroke, so that the inlet valve is open, so that fuel has unimpeded access to flow into the cylinder; that is possible and more likely on a twin or four cylinder engine, but on a single, the engine will normally stop half way up the compression stroke, both valves shut. (Turn ignition 'off'; sparks stop, engine spins 'on' until it's lost momentum; little resistance is applied on the other three strokes, so resistance applied by the compression stroke, is usually the one that brings it to a complete stop}
Now, vacuum taps are USUALLY pretty damn reliable; IF they give any grief, it's more common that the vacuum hose to them has been pulled off and pushed back on so many times, or has perished, it doesn't seal vacuum, so the tap doesn't get turned on, or turns the fuel off when you don't want it to... an old vac hose has had me at the side of the road shaking the tank and scratching my head a couple of times... it's not exactly a 'major' danger! Annoying, embarrassing, perhaps? But it's not likely to put your bike or health at much risk!
So, from that fundamental; ripping out a well proven, high reliability component, on the 'fear' it might fail; to replace it with some lesser known quantity, after market device, in a more complicated amateur installation, DOES NOT make sense. You are swapping a proven system for an unproven one.. WHICH should you have more 'confidence' in to not fail?
You are engineering 'in' potential problems.
Now, look at your proposed schematic; you have three taps, therefore three potential failures, instead of one.
Your 'emergency on' tap; makes the other two redundant, and if you forget to switch that 'off', then you are actually causing the 'failure mode' you wish to avoid!
So whilst, your suggested plumbing might 'work', as arranged, it's not doing what you hope, and reducing the risk of a fuel leak; and on many many counts, it's actually increasing the risk...
AND, it's NOT actually tackling the main 'cause' of a leak, IF you had one... which is in the carburetor, float valve, choke bypass and overflow.
It's like being worried about fire, and rather than getting the oven serviced, looking at the fire blanket over the oven, and thinking "That doesn't look very good!" and buying a bucket and filling it with water....
Carrol Shelby, winning sports car racing championships in the 1960's with a buggy-spring hot rod, when every one else was using more sophisticated twin-wish bone and coil-spring arrangements, asked why he didn't adopt the 'better suspension' famous commented "If it aint broke, don't fix it!"
| macdaddy86 wrote: | Would be nice though to not have to worry about switching it off. |
And there's the nub. The 'only' benefit of even a vacuum tap, is the 'easement' of not having to remember to manually turn the petrol tap 'off', which is what generations of riders lived with for decades before vac taps came along.
My advice... leave it the fcuk alone! if it aint broke, DONT fix it!
If it IS broke, before looking for 'more' than standard, make sure you have all you should AS standard (Another racing adage!}
IF the vac tap breaks, fit a new one. IF the carb is prone to flooding, service it! That little nugget even sorted err-bluddi-guzzi's notorious incontinence problem when she forgets the taps!
____________________
My Webby'Tef's-tQ, loads of stuff about my bikes, my Land-Rovers, and the stuff I do with them!
Current Bikes:'Honda VF1000F' ;'CB750F2N' ;'CB125TD ( 6 3 of em!)'; 'Montesa Cota 248'. Learner FAQ's:= 'U want to Ride a Motorbike! Where Do U start?' |
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P.
Red Rocket
Joined: 14 Feb 2008
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Old Thread Alert!
The last post was made 9 years, 104 days ago. Instead of replying here, would creating a new thread be more useful? |
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