The engineering of an engine

[sfenton311]

As I look at the different specs on the 600s out there, I may be asking a question that doesn't matter, but I still wonder...
Is there an advantage to the different angles, or directions a motor is on a bike? and if so what IS the advantage?

such as Suzuki's vs Yamaha's description below:


Suzuki

Cylinder head features a narrow 28° included valve angle (13° intake, 15° exhaust), creating a more compact combustion chamber, higher compression ratio and a straighter intake tract for improved power.

Yamaha

600cc, liquid-cooled, 4-stroke, forward inclined in-line 4-cylinder, DOHC 16 valves

Honda
(nothing about engine design) Does anyone know?

[Pringles]

It's all marketing BS. They know most people haven't a clue what a narrow included valve angle means, perhaps they just say it to make themselves look clever. You shouldn't really pay attention to that BS, but if you want to, there are books that will explain what all these technical terms mean. You can also search google to find explanations.

Both descriptions you posted are completely irrelevant to each other. Suzuki is talking about the positioning of the intake and exhaust valves relative to each other inside the cylinder head, whilst Yamaha is describing the positioning of the whole engine on the bike's frame (forward inclined).

Suzuki, Yamaha, Honda and Kawasaki 600cc bikes are very similiar in terms of engine configuration and positioning so there isn't much to talk about really.

[Blue02R6]

Cylinder head features a narrow 28° included valve angle (13° intake, 15° exhaust), creating a more compact combustion chamber, higher compression ratio and a straighter intake tract for improved power.

This to me is very funny, because compression ratios are determined by many things least of all valve angle.

[94tegRS]

Originally Posted by Blue02R6

Cylinder head features a narrow 28° included valve angle (13° intake, 15° exhaust), creating a more compact combustion chamber, higher compression ratio and a straighter intake tract for improved power.

This to me is very funny, because compression ratios are determined by many things least of all valve angle.

but since the smaller included angle makes the combustion chamber more compact, isnt that a way to raise compression?

[Pringles]

True. Not sure about the straighter intake tract part though...