6 replies to this topic

[johnnycomelately1]

What are the inlet and exhaust valve sizes for any of the turbo engines, either from the 80's or the current formula?

This is to ponder the exhaust size required to effectively remove the extra atmospheres of inlet charge.

Any facts known?

[gruntguru]

It is normal practice to make the exhaust valve larger (ie closer to the inlet size) in a supercharged engine.

Normally aspirated engines will typically have an exhaust diameter 80% - 90% of the inlet diameter. For supercharged engines the range is 90 - 100%. The better the cylinder head breathing and the higher the boost, the higher the ratio.

[johnnycomelately1]

thanks GG

[johnnycomelately1]

I MADE A PREVIOUS POST REGARDING VALVE TIMING, ALL RELATED IN THAT THE DURATION AND THE FLOW CAPABILITY DELIVER THE TOTAL CYLINDER FILL.

THE f1 ENGINES FROM WHAT I CAN SEE HAVE VERY LARGE EXHAUST PIPES, THAT I WHY I WAS CURIOUS TO FIND THE TIMING

[J. Edlund]

Valve sizes of a few turbocharged engines from the eighties

 

BMW M12/13
Bore: 89.2 mm
Inlet valve: 35.8 mm
Exhaust valve: 30.2 mm (84,4% of inlet diameter)

Renault EF15
Bore: 80.1 mm
Inlet valve: 29.8 mm
Exhaust valve: 26.1 mm (87.6% of inlet diameter)

Zakspeed
Bore: 90.4 mm
Inlet valve: 34 mm
Exhaust valve: 31 mm (91.2% of inlet diameter)

 

A naturally aspirated F1 engine for comparison

 

Toyota RVX-09

Bore: 96.8 mm

Inlet valve: 41 mm

Exhaust valve: 33.5 mm (81.7% of inlet diameter)

[johnnycomelately1]

Valve sizes of a few turbocharged engines from the eighties

 

BMW M12/13
Bore: 89.2 mm
Inlet valve: 35.8 mm
Exhaust valve: 30.2 mm (84,4% of inlet diameter)

Renault EF15
Bore: 80.1 mm
Inlet valve: 29.8 mm
Exhaust valve: 26.1 mm (87.6% of inlet diameter)

Zakspeed
Bore: 90.4 mm
Inlet valve: 34 mm
Exhaust valve: 31 mm (91.2% of inlet diameter)

 

A naturally aspirated F1 engine for comparison

 

Toyota RVX-09

Bore: 96.8 mm

Inlet valve: 41 mm

Exhaust valve: 33.5 mm (81.7% of inlet diameter)

thank you so much

[mathewking21]

 

Thanks for this great information about turbocharged engines Ediund