Thread: Ve valve size?

Anyone know the stock size of the sr20ve Intake and exhaust valves? I don't feel like going to the shop and measure them if anyone know's off hand thanks.

29.15mm on ex
intake is same as DE 34mm

i'm curious as to why they made the VE ex smaller than the DE? Is it because the DE was a redheaded stepchild from the DET family so they didn't bother re-engineering it or was it purpose built? If so, what explanation is there for the small VE sizes?

Backpressure and some allmotor tech stuff

VE is a an all motor engine essentially so that is why it is smaller. DE/T are turbo motors so that is why exhaust valves are 1mm bigger....

thank you! i've been lookin for this and couldn't find it. -forum FTW!

Sr20ve Valves And Sr20de Roller Cam Are De Same???

it is as daxx has said
the last head i had done the int. measured at:34.17 and the exhaust 29.2

the valve being smaller allows for more velocity exiting the head.

The DET has the 30mm Exhaust valve for more low to mid lift exhaust flow. The DET 30mm Valve also uses a 7mm stem that is flared towards the valve head. This is for strength, heat dissipation, and also, these valves are sodium filled. The DE head with the 30mm valve flows better than the DET everywhere. The 29mm VE valve actually flows more than the DET/DE above .300" lift I believe. I would have to recheck but its pointless i think. The smaller valve allows higher gas velocity as it exits the cylinder as well as for a slight deshrouding on the back side of the valve which increases flow.

Remember, both the SR16VE and the SR20VE were designed to have LESS hp than any DET out there. Also a reason why the DET's have larger EX valves. The DE's have the same size EX valves as the DET because they are 95% the same motor as a DET. Rather than change the valves, valve seats, and so on, they just changed the guides and valves to 6mm stems.

-Ted