Offset cylinder explained.

[Zynerji]

It seems obvious that F1 would already use this concept, as the intake/exhaust duration seems to be a No Brainer for a turbo formula.

Insights from the forum would be very welcome!

[PhillipM]

It's normal even in a lot of old production engines.

[Zynerji]

It's normal even in a lot of old production engines.

I understand. I would also love to hear about the harnessable benefits for turbocharging. With shorter exhaust duration, the exhaust speed would need to increase. Obviously, longer intake stroke then improves cylinder packing, especially under boost.

It just seems like a dream combination for turbocharger efficiency.

[gruntguru]

You don't think "getting the exhaust out" is important to turbo engines?

[saviour stivala]

Getting exhaust out is important, It is easer done on a turbocharged engine then on an NA engine. BUT. On the present day F1 turbocharged engine with such a high risk of misfire by trying to ignite a mixture at ^-1.4 it is super-important.

[Greg Locock]

It's called Desaxe. If you mess about with a timing diagram you'll see the results are subtle to say the least, for sensible amounts.

[saviour stivala]

Were and when there is a gain to be had no matter how subtle those in F1 will dive head first for it as they are not going to let the competition gain a subtle advantage while they don't.

[Greg Locock]

Indeed. Now consider the disadvantages. Very few modifications have no disadvantages.

[Zynerji]

You don't think "getting the exhaust out" is important to turbo engines?

I know it is. My point is that lessening the time will increase the speed of the exhaust. I believe that to be turbo beneficial.

[gruntguru]

You don't think "getting the exhaust out" is important to turbo engines?

I know it is. My point is that lessening the time will increase the speed of the exhaust. I believe that to be turbo beneficial.

Hmmmm . . . making the exhaust valves and ports smaller will increase the speed too . . . but they don't do that!

[Zynerji]

You don't think "getting the exhaust out" is important to turbo engines?

I know it is. My point is that lessening the time will increase the speed of the exhaust. I believe that to be turbo beneficial.

Hmmmm . . . making the exhaust valves and ports smaller will increase the speed too . . . but they don't do that!

I'm sure there are a million trade offs. I guess the pumping losses increase of the exhaust stroke then as the piston forces the exhaust out the valve?

Or maybe just upsize the exhaust valve to compensate for shorter duration?

[gruntguru]

Yes, something like that would have to happen.

[Zynerji]

Yes, something like that would have to happen.

Interesting that upsizing the exhaust valve then may then restrict the size of the intake valve. It's all trade-offs.

[saviour stivala]

Valve overlap on a turbo engine allows not only a cooling effect on combustion chamber but also help 'flush' the top of cylinder including exhaust valve ports of exhaust gasses.

[gruntguru]

Providing the design has achieved a positive pressure differential during overlap.