Flow Testing a Stock Cylinder Head (Part 1)

See how we flow test a stock motocross (2010 YZ450F) cylinder head using a flow bench. This is part 1 of a 3 part series...courtesy of Pro-1 Racing Heads. www.pro1racingheads.com

Category:

Autos & Vehicles

Tags:

• flow
• flow bench
• flow test
• cylinder head
• motocross head
• yz450 head
• motocross cylinder head
• motorcycle head
• motorcycle cylinder head

[rwdford]

Very interesting, would I be correct in saying the loud screeching sound from that inlet port at moderate lift indicates turbulance in the port most likely around the valve seat area?

Should the port get quieter as it is modified since the air will flow smoother with a higher flow rate and velocity per port X sectional area?

Does that make sense to you?

Great work as usual :)

Regards

Jason

[ShortBlockCharlie]

@rwdford you are correct this common to find in stock ports. this where spending alot of time trying different valve seat angle a working around the port area around the seat is so inportant thanks charlie

[marek0086]

@rwdford~ the hissing sound is from the high air velocity.... not really turbulence.

[magna59]

Thanks you guys, I never realise how little movement there was, ie as a 'to work' mechanic, if it gets me to work, that fine, I had never thought about the reality of the setting of the gap, and how little space there is to hastle that materials through.

[magnahelic1]

very good charlie, will look out for your following vids