Cool Honda Picture thread

prelude91 · Post by **prelude91** » Wed Feb 19, 2014 1:59 am

very well, thank you, doggo, just spent 14 days touring the coast round the north island, saw dolphins in Bay of Islands, absolutely awesome scenery too, Russell was a lovely town, saw the site of the first treaty between maori chiefs and early brit traders. I didn't realise that 'proper' colonisation of NZ took place so long after Oz. despite traders and explorers, including Cook, landing here for a couple of centuries or so, the first real colonisers didn't arrive 'til 1840. Makes you wonder why they still helped us out when we had problems with our neighbours, especially the Boer and Great war, potentially they left Europe to escape all that poo, but still chipped in when called upon. Humbling thoughts.

prelude91 · Post by **prelude91** » Wed Feb 19, 2014 2:06 am

Going back to techy, I wonder how the manu's manage to get an engine to work on some, rather than all cylinders, there must either be separate cranks, a balancer, or some arrangement whereby the off load cylinders somehow disengage from the crank, a bit like a sprag clutch, or some such? How to overcome the inbalance when some cylinders aren't firing? The guy with the accord said it could fire on 4 or even 3 of its six cylinders, 3, ok, one bank only, but 4 out of six?

mercutio · Post by **mercutio** » Wed Feb 19, 2014 6:12 pm

the others keep moving so no imbalance the only thing is there is no bang they basically switch off the injectors to that engine the downside is more air going into the exhaust so you would need o2 sensors on each exhaust runner so the fuelling doesn't go through the roof

Post by **Doggo** » Wed Feb 19, 2014 7:12 pm

prelude91 wrote:Going back to techy, I wonder how the manu's manage to get an engine to work on some, rather than all cylinders, there must either be separate cranks, a balancer, or some arrangement whereby the off load cylinders somehow disengage from the crank, a bit like a sprag clutch, or some such? How to overcome the inbalance when some cylinders aren't firing? The guy with the accord said it could fire on 4 or even 3 of its six cylinders, 3, ok, one bank only, but 4 out of six?

I should look this up, but my (uneducated) guess is that the crank is normal and they just cut off the fuel and open the valves to reduce the pressure in the unused cylinders... the weight of the pistons themselves can't be that much to carry...? I reckon someone will be along in a minute to enlighten us.

EDIT: Oh Bollocks, Merc already has ^^^

Cheers, Merc. No idea how I missed that

Post by **Doggo** » Wed Feb 19, 2014 7:15 pm

prelude91 wrote:very well, thank you, doggo, just spent 14 days touring the coast round the north island, saw dolphins in Bay of Islands, absolutely awesome scenery too, Russell was a lovely town, saw the site of the first treaty between maori chiefs and early brit traders. I didn't realise that 'proper' colonisation of NZ took place so long after Oz. despite traders and explorers, including Cook, landing here for a couple of centuries or so, the first real colonisers didn't arrive 'til 1840. Makes you wonder why they still helped us out when we had problems with our neighbours, especially the Boer and Great war, potentially they left Europe to escape all that poo, but still chipped in when called upon. Humbling thoughts.

Indeed.

Most of us haven't a clue about New Zealandish history, I think.

All sounds good.

prelude91 · Post by **prelude91** » Wed Feb 19, 2014 10:49 pm

Thanks guys, even with the valves open on the non firing pistons, I'd have thought the dead weight of several pistons moving up and down with no power stroke would cause a lot of vibration, even at low revs. I'm sure we've all experienced the loss of power and vibration caused when one spark plug breaks down.

mercutio · Post by **mercutio** » Thu Feb 20, 2014 7:56 am

yah that's normally a 4cyl engine running on 3 so is not balanced when you can choose which cylinders to stop an stop an even number! your balance will remain

Post by **NafemanNathan** » Thu Feb 20, 2014 1:10 pm

Nitin's going to flip his lid when he sees all this!

nitin_s1 · Post by **nitin_s1** » Thu Feb 20, 2014 2:59 pm

I was going to Neg rep anyone who posts here without a cool honda pic..

can't be bother..

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[insta][/insta]

Post by **Doggo** » Thu Feb 20, 2014 7:41 pm

Sorry, chaps. Know it's not popular