Random question regarding engine sizes

[mikeyw64]

OK we all know that whatever the manufacturer calls it the actual engine size is frequently different


eg the 1400GTR has a 1352cc engine.

Now I can understand why they wouldn't want to call it a 1352GTR but is there any reason why they don't make the engines exactly 600, 1100,1400 etc?

Its not even as though 1352cc (for example) has an exact imperial equivalent (its actually 82.5041 cubic inches)

[Lonewolf]

Is it coincidence that Kawasaki call their bike a 1400 GTR but give you 1352cc and yet BMW call their bike a K1600 and yet give you 1649cc




Perhaps PRD can answer this question, he is after all a spokesperson for BMW. 

[PaulB]

Short answer: Pi is an irrational number. 3.14159265.... etc etc

If they make the bore and stroke nice sensible whole numbers for ease of manufacturing, then the engine capacity (for a 4 cylinder engine) is 4 * (Pi * (bore/2) * (bore/2) * stroke) where the numbers for bore and stroke are expressed as cm rather than mm.

Cheers

Paul B.

[mikeyw64]

Short answer: Pi is an irrational number. 3.14159265.... etc etc

If they make the bore and stroke nice sensible whole numbers for ease of manufacturing, then the engine capacity (for a 4 cylinder engine) is 4 * (Pi * (bore/2) * (bore/2) * stroke) where the numbers for bore and stroke are expressed as cm rather than mm.

Cheers

Paul B.

[PRD]

Is it coincidence that Kawasaki call their bike a 1400 GTR but give you 1352cc and yet BMW call their bike a K1600 and yet give you 1649cc




Perhaps PRD can answer this question, he is after all a spokesperson for BMW. 

sure can. It is because BM need extra cc's to keep up!

[StickyOne]

Short answer: Pi is an irrational number. 3.14159265.... etc etc

If they make the bore and stroke nice sensible whole numbers for ease of manufacturing, then the engine capacity (for a 4 cylinder engine) is 4 * (Pi * (bore/2) * (bore/2) * stroke) where the numbers for bore and stroke are expressed as cm rather than mm.

Cheers

Paul B.

Just what I thought (not)!
Too complicated for my brain!

[O.C.]

you guys need to get out more 

Too busy riding to count ccs...anyways the ZZR1400 has a 1441 cc motor   

[PaulB]

you guys need to get out more 

Too busy riding to count ccs...anyways the ZZR1400 has a 1441 cc motor   

(A) Yes, I do need to get out more!

(B) I thought the ZZR had the same lump but a different ECU. Ya learn something new every day!

Cheers

Paul B.

[mikeyw64]

(A) Yes, I do need to get out more!

(B) I thought the ZZR had the same lump but a different ECU. Ya learn something new every day!

Cheers

Paul B.

Ah that will be down to the bore & (longer) stroke multiplied by pi and the number of cylinders  ;)

ZZR1400  84.0 mm × 65.0 mm
GTR1400  84.0 mm × 61.0 mm

[Boomer]

Early ZZR1400 was 1352cc the same as the GTR1400.
More power was because of different cams and no VVT.
GTR1400 has a better spread of torque thanks to VVT and softer cams.

[coman37]

Talking of bores ............

Coman

[virginiajim]

Is it coincidence that Kawasaki call their bike a 1400 GTR but give you 1352cc and yet BMW call their bike a K1600 and yet give you 1649cc

Wow!

you guys need to get out more 
Too busy riding to count ccs...anyways the ZZR1400 has a 1441 cc motor   

Wow!

[Boomer]

Talking of bores ............

Coman

Nobody is forcing you to read it. Sounds like someone needs to go for a ride.

[coman37]

Irony doesn't transmit well on email, i should have added a laughing banana or something,

Ps just been out for a ride, Mijas to Marbella and back, 38c in direct sunshine, 24c in the shade. Might go to Ronda tomorrow

Coman

[O.C.]

Irony doesn't transmit well on email, i should have added a laughing banana or something,

Ps just been out for a ride, Mijas to Marbella and back, 38c in direct sunshine, 24c in the shade. Might go to Ronda tomorrow

Coman

thanks for that    

It was between  5 and 8 degrees here today and a bit chilly on my ride out ....brrrrrrrrr