£9.99 Tyre Pump

[King Key]

Cheers Wreford Mile, I bought one of these pumps for a tenner at a local petrol station. Fits nicely in my alloy tool box bolted to the pannier frame.

It wouldn't operate on the accessory socket (used a standard to mini convertor plug), the canbus found it drained too much and switched off the socket each time after a few seconds. So I chopped off the plug and fitted an Optimate type connector plug. There was already an Optimate socket wired directly through a 10 amp fuse to the battery so it's a doddle to connect using this. Almost looking forward to a flat!

 

[Joe narvey]

A lead acid starter battery can only usefully deliver about 1/3 of its charge capacity before the voltage drops too low.

A small tyre pump should be able to inflate a tyre in 10 to 15 minutes.

5 amps for 12 minutes is just 1 Amp Hour. So the typical 14AH Beemer battery should be more than capable of pumping up a tyre with plenty of charge to start the engine.

No need to run the engine.

What is the max current I can draw off the GS battery, engine running for 5 min?

( no, I'm not giving away GCSEs, I'm trying find out if I'm going to fry my battery.

 

[Bendy toy]

Headlight 50 watts (max)
Other lights 10 watts (max)
ECU, and fuel pump 10 watts (my guess)

Generator makes 510 watts (So says Google)

Primary school sums do the rest.
If the bike uses 100 watts you still have 400W to use on *stuff*. Amps = watts/volts.

Battery chucks out 250 cold cranking amps. Probably a lot more at normal UK summer temperatures. It wont do that for very long but it *can* do it.

 

[Joe narvey]

Headlight 50 watts (max)
Other lights 10 watts (max)
ECU, and fuel pump 10 watts (my guess)

Generator makes 510 watts (So says Google)

Primary school sums do the rest.
If the bike uses 100 watts you still have 400W to use on *stuff*. Amps = watts/volts.

Battery chucks out 250 cold cranking amps. Probably a lot more at normal UK summer temperatures. It wont do that for very long but it *can* do it.

Excellent, thank you. I think I was on a Power trip of being school milk monitor so didn't have to pay attention to those lessons.

 

[Roymondo]

Fuel pump on its own draws about 90W. There are also heaters in the Lambda sensors which draw a few Amps between them, plus injectors, not to mention ignition coils. The whole shooting match draws a *lot* more than 100W!

Sent using smoke and mirrors

 

[Joe narvey]

Largest 12v socket I can find is max 120w. My expresso machine is 130w.

 

[Alan R]

Just for clarity - one of these compressors will chug quite happily from the canbus socket if there is nothing connected to the air hose (no load). Connect to a tyre and canbus will shut it down. Similarly,fitted to an optimate direct to battery lead, a 5amp fuse will let it run against no load but will blow the fuse if connected to a tyre. Fit a 10 amp fuse and all is golden. Actual experience, rather than theoretical supposition.
Alan R

 

[kevingambrell]

When it comes down to it BMW wont fit an alternator that puts out twice what the bike wants to run. They will fit an alternator that will cope with
an average usage and let the battery soak up any surges that the systems load up.
Running a pump from the CanBus is probably fineand as long as the Bus dont trip out no harm will be done.
Running a fused line from the battery on the other hand is a sure fire way to get power when you need it, like on a dark wet night in the middle
of puncture land.
Saying to your self that the battery will cope with 20 minutes running a pump and maybe a light and then still start the bike is fine if your
down at the coffee shop drinking your fith cup of goo.
If on the other hand your 150 miles from the next person with a jumper cable START the bike and be sure you have enough power in the battery.
A flat tyre is a pain in the arse but a flat tyre then a flat battery is a pile of crap no one wants.
On loing journies I carry a Co2 inflator and an electric pump. One takes up a bit of room the other takes up the space of a packet of fags.
If I have to I can start the inflation of the tyre with C02 and finish it with the pump.
I also now carry a power pack that will start the bike and its about the size of my Iphone, come to that it will also charge my Iphone and has
a very decent LED torch on the side.
All up the gear I carry cost me less than £40 and may if the gods are with me never get used, but if I need it I have it with me.
Lets face it four or five cups of Joe out of Costastarbucks is pretty much £40.

 

[Roymondo]

Lets face it four or five cups of Joe out of Costastarbucks is pretty much £40.

Feck - I thought Motorway Service Area Costa Express coffees were expensive at 3 quid a go! Where on earth do you pay getting on for a tenner?

Sent using smoke and mirrors

 

[kevingambrell]

I took our boy and his girlfriend into a coffee shop in Crawley for three of us the bill was £24. His GF had a tripple chocolate god knows what that cost me £9.60 I cried almost all the way home silently in my crash helmet.

 

[alex_rsa]

Just for clarity - one of these compressors will chug quite happily from the canbus socket if there is nothing connected to the air hose (no load). Connect to a tyre and canbus will shut it down. Similarly,fitted to an optimate direct to battery lead, a 5amp fuse will let it run against no load but will blow the fuse if connected to a tyre. Fit a 10 amp fuse and all is golden. Actual experience, rather than theoretical supposition.
Alan R

Pumped the tyre on my 800gs through CANBUS plug. Tyre was not flat but was quite happy running for 30 seconds. Bike was running at the time. Documentation on pump some says 6amp draw so must be close enough not to be shut down. Actual experience

 

[Bendy toy]

The smal lithium starter batteries are fine for warm weather and restarts but would struggle with a proper cold start. Add a booster pack and it's all covered.
The larger lithiums will of course be fine but don't have the other uses of the booster pack.

Sent via iPhone so expect strange words

 

[King Key]

Cheers Wreford Mile, I bought one of these pumps for a tenner at a local petrol station. Fits nicely in my alloy tool box bolted to the pannier frame.

It wouldn't operate on the accessory socket (used a standard to mini convertor plug), the canbus found it drained too much and switched off the socket each time after a few seconds. So I chopped off the plug and fitted an Optimate type connector plug. There was already an Optimate socket wired directly through a 10 amp fuse to the battery so it's a doddle to connect using this. Almost looking forward to a flat!

Real experience too. So it looks like it works with some and not with others without a little improvisation.