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Author Topic: Twin piston vs Triple piston..  (Read 1846 times)

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Offline Fransw

Twin piston vs Triple piston..
« on: August 14, 2018, 11:30:54 am »
Most big adventure bikes have a twin piston motor(BMW, KTM, T7, etc) But what about the triple piston Triumph Tiger 800!?..

What are the main differences?

Any thoughts?....thanks! :thumleft:
 

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Re: Twin piston vs Triple piston..
« Reply #1 on: August 14, 2018, 11:33:34 am »
That triple makes a oh so nice sound!! :thumleft: :drif:
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Offline the_BOBNOB

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Re: Twin piston vs Triple piston..
« Reply #2 on: August 14, 2018, 11:36:03 am »
What are the main differences?

1 extra piston

 :peepwall:
 

Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #3 on: August 14, 2018, 11:38:10 am »
That triple makes a oh so nice sound!! :thumleft: :drif:

Yes, some says it sounds like a Tiger! O0
 

Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #4 on: August 14, 2018, 11:39:24 am »
 

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Re: Twin piston vs Triple piston..
« Reply #5 on: August 14, 2018, 11:41:58 am »
What are the main differences?

1 extra piston

 :peepwall:

Good point!  :snorting:
three more rings too ;)

I think maybe compared to the 800 GS which is a twin the Truimph 800 might have more bottom torque with the three silinder. Just a guess.
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Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #6 on: August 14, 2018, 11:46:59 am »
What are the main differences?

1 extra piston

 :peepwall:

Good point!  :snorting:
three more rings too ;)

I think maybe compared to the 800 GS which is a twin the Truimph 800 might have more bottom torque with the three silinder. Just a guess.

What about reliability? ....the service intervals on the Tiger are still only 10k

Yes the torque is nice! Aparantly most of it is available at only 2500rpm..
 

Offline goodtoogo

Re: Twin piston vs Triple piston..
« Reply #7 on: August 14, 2018, 11:50:10 am »
Tiger is so smooth. 3 cylinders little to no vibration. A great compromise bike. Covers a lot of asks. And it sounds great


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Offline Roadhawg

Re: Twin piston vs Triple piston..
« Reply #8 on: August 14, 2018, 11:54:52 am »
I'd imagine weight savings are harder to achieve with a triple.  It's a whole extra piece of block and head, and then longer crank etc.
VTwin probably also heavier than parallel twin, but you can make it a bit skinnier.
 

Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #9 on: August 14, 2018, 11:56:37 am »
Tiger is so smooth. 3 cylinders little to no vibration. A great compromise bike. Covers a lot of asks. And it sounds great


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Yes, the smoothness is a big plus!

...and the toughest oke on the planet, Bear Grylls, rides a Tiger! O0
 

Offline Dux

Re: Twin piston vs Triple piston..
« Reply #10 on: August 14, 2018, 11:58:22 am »


What about reliability? ....the service intervals on the Tiger are still only 10k

Yes the torque is nice! Aparantly most of it is available at only 2500rpm..

Reliability is good , a few older models had starter motor issues but to the best of my knowledge those are sorted , very smooth engine and also a very linear power delivery , a good bike  :thumleft:
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Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #11 on: August 14, 2018, 12:05:19 pm »


What about reliability? ....the service intervals on the Tiger are still only 10k

Yes the torque is nice! Aparantly most of it is available at only 2500rpm..

Reliability is good , a few older models had starter motor issues but to the best of my knowledge those are sorted , very smooth engine and also a very linear power delivery , a good bike  :thumleft:

Thanks! I now its a British bike, but are they built in England?
 

Offline Dux

Re: Twin piston vs Triple piston..
« Reply #12 on: August 14, 2018, 12:41:34 pm »
Yip , made in the UK at the Hinckley factory
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Offline Ganjora

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Re: Twin piston vs Triple piston..
« Reply #13 on: August 14, 2018, 12:41:45 pm »
had a triumph but with the 675cc motor.
torque absolutely everywhere.
 

Offline the_BOBNOB

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Re: Twin piston vs Triple piston..
« Reply #14 on: August 14, 2018, 12:56:35 pm »
Generally the fewer pistons the lower down the torque sits.

So a big single has lots of meaty torque low down.

More cylinders equal more top end.

So the 3 cylinder is a best of both between the 2 cylinder and 4 cylinders.

Has more usable torque than 4 cylinders but revs up more freely to higher rpm than the 2 cylinders.
 
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Offline Beebop

Re: Twin piston vs Triple piston..
« Reply #15 on: August 14, 2018, 01:00:27 pm »

So the 3 cylinder is a best of both between the 2 cylinder and 4 cylinders.

Has more usable torque than 4 cylinders but revs up more freely to higher rpm than the 2 cylinders.

This is where I believe they hit paydirt with the triples.
My son had the Daytona 675, and now has the Speed triple.
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Offline roxenz

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Re: Twin piston vs Triple piston..
« Reply #16 on: August 14, 2018, 01:10:48 pm »
Generally the fewer pistons the lower down the torque sits.
So a big single has lots of meaty torque low down.
More cylinders equal more top end.
So the 3 cylinder is a best of both between the 2 cylinder and 4 cylinders.
Has more usable torque than 4 cylinders but revs up more freely to higher rpm than the 2 cylinders.
Agree with your analysis. To me this means that more cylinders are better suited to road-oriented riding, and fewer cylinders would suit slower technical riding better. I think that is the main reason why adventure (dual sport) bikes are mainly singles or twins. Just mentally surveying current engine arrangements, it would seem that the smallest cylinder size is around 400cc, i.e. 800cc twins, or 650cc singles and up. Adventure bikes are relatively heavy and need a bit of torque to work with on slow technical stretches.
« Last Edit: August 14, 2018, 01:11:41 pm by roxenz »
 

Offline Fransw

Re: Twin piston vs Triple piston..
« Reply #17 on: August 14, 2018, 01:16:43 pm »
Generally the fewer pistons the lower down the torque sits.
So a big single has lots of meaty torque low down.
More cylinders equal more top end.
So the 3 cylinder is a best of both between the 2 cylinder and 4 cylinders.
Has more usable torque than 4 cylinders but revs up more freely to higher rpm than the 2 cylinders.
Agree with your analysis. To me this means that more cylinders are better suited to road-oriented riding, and fewer cylinders would suit slower technical riding better. I think that is the main reason why adventure (dual sport) bikes are mainly singles or twins. Just mentally surveying current engine arrangements, it would seem that the smallest cylinder size is around 400cc, i.e. 800cc twins, or 650cc singles and up. Adventure bikes are relatively heavy and need a bit of torque to work with on slow technical stretches.

According to Triumph most of the Tiger's torque is available at only 2500rpm.. That's not bad!?...or what?
 

Offline Welsh

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Re: Twin piston vs Triple piston..
« Reply #18 on: August 14, 2018, 01:29:02 pm »
Its not all about that, like the "big bang" Yamaha fours and the new Africa Twin, the turbine smoothness doesn't give great grip particularly off tar, so the Africa Twin has a 270 degree crank, to give a pulsing power delivery, better for grip.  :sip:
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Offline Dux

Re: Twin piston vs Triple piston..
« Reply #19 on: August 14, 2018, 01:36:32 pm »
Generally the fewer pistons the lower down the torque sits.

So a big single has lots of meaty torque low down.

More cylinders equal more top end.

So the 3 cylinder is a best of both between the 2 cylinder and 4 cylinders.

Has more usable torque than 4 cylinders but revs up more freely to higher rpm than the 2 cylinders.

The only reason for that is that singles tend to rev lower than twins which in turn rev lower than triples and that is due to frictional losses more than anything else , the power delivery will all be due to the state of tune of the engine , so you could easily have a triple making more torque than a single or twin , but as things are at present Triumph haven't done that and have instead gone for a very user friendly power delivery over a very wide spread of rpm so you might have 90% of peak torque at 2500rpm  while the peak torque itself is at about 8000rpm , peak hp will probably be at about 9000rpm so you have a nice 6500rpm wide powerband to play with . For the record the BMW 800 and Triumph 800 make the same torque .
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