water manometer

[(RIP) Kaister]

I need to balance or check the balance of the cylinders on the 1100.

Can't be bothered with a twinmax or carbstix cos i don't know where to get them.

So i thought about a water manometer - and found this.
I'll give it a go soon and let you know what happens.
Looks pretty cheap and accurate.
Can't see any downsides apart from the height needed.

http://www.obairlann.net/~reaper/bmw-bike/manometer.html

and here's the theory behind it all :

http://www.efunda.com/formulae/fluids/manometer.cfm

 

[imobu]

water thing

I tried one of these things but used two stroke oil in place of water, I was worried I might get water in the engine. I had 2' of oil in each column and 2' empty tube above that. Along with Oilhead valve adjustment for dummies from the Advrider site (sorry dont know how to do web page link thing) the bike is loads better. I will try a thinner oil next time .
Regards,
Ian
PS the adjusting valves with two pair of feelers at the same time is spookey, the inlet moves when you adjust the outlet.????
I also did not realise how sensitve you have to be when tightening the cable lock nuts.

 

[Rob Farmer]

Been using one for ages http://www.ukgser.com/forums/showthread.php?s=&threadid=1944&highlight=balancing

Automatic transmission fluid works well, water tends to bounce about too much. My throttle cable screwed up in Spain last year so I had to make a manometer, I always carry a piece of tubing when I go away now just in case.

 

[(RIP) Kaister]

i thought somebody somewhere would be using them.

Ialso thought about the viscosity thing - maybe changing the water or using some sort of clamp to squeeze the tube to act as a damper.

I'll be using ATF then if that works - cheers rob.

What happened to the 'guzzi - still going ??

 

[littleredrooster]

So how the f()ck do you strap THAT to the bike to get an accurate reading at 4000rpm under load????

 

[(RIP) Kaister]

If the air inlet butterfly's are balanced at idle speed, then they will be 99.9% right at other openings.

The fuel mixture is controlled on one side by a pot and duplicated
on the other side. - idle balance controls this.

The ratio of closed area to open area of the inlet venturi is greatest at idle, therefore this is where unevenness and out-of-balance characteristics show up the most.

If you're saying that being balanced for 4000 rpm at load is more critical and different to idle then what you're also saying is that the balance is only absolutely 100% at one particular point of the opening cycle.

( theoretically this is true, but you'd never notice it )

If the engine was only operated at one throttle opening, i would agree that you would balance for this point.

If you balance at idle then also balance at 4000 and find you have a marked difference, say greater than 2%, then you'd need to change something like the butterfly operating cam.

Either that or the engine needs 'fettling' or tuning to spec. ( valves, rings, leakdown tests etc to find the cause )

Happy hunting.

 

[Rob Farmer]

Phil,

You can buy ready made manometers from around £10 and put ATF in instead of water http://www.plumbworld.co.uk/613-2630
This sort of kit should be available in Oz for the same sort of money.

Guzzi went quite a while ago, got a Norton Commando coming this weekend.

 

[cookie]

Guzzi went quite a while ago, got a Norton Commando coming this weekend. [/B]

won't be seeing much of you for a while then