Massaging Intake Valves for more power

[Lextreme II]

Hey Gang,

My talked to my Performance Engine Builder few weeks ago. One of the thing he emphrazed was the intake valves. He stated that Lexus intake valves are very restrictive and he also stated that exhaust valves are flowing pretty well as stock.

He mentioned doing some work on the intake valves will help increase power. Very interesting to find out.

 

[SCV8]

I'd noticed from the pictures in the tech articles that there is some room for performance in the valve/seat area. Is this what he was talking about, or is there something I'm missing?
Whenever I get curious about something inside my engine I just start looking through the tech articles here and find it, love that.

 

[Howdy]

Hey Gang,

My talked to my Performance Engine Builder few weeks ago. One of the thing he emphrazed was the intake valves. He stated that Lexus intake valves are very restrictive and he also stated that exhaust valves are flowing pretty well as stock.

He mentioned doing some work on the intake valves will help increase power. Very interesting to find out.

I have a magazine with an article about a seriously modified 1uzfe engine. They're using a 36 mm custom made intake valve.

 

[MWP]

Have you guys seen this?

http://autospeed.drive.com.au/cms/A_1591/article.html

Photo of interest:


These guys are in the city where i live... might have to go see them at a later date

 

[Zuffen]

I'm pretty sure if you do a Websearch and can find a direct link (off the Web) to the page you can read the whole thing.

Autospeed is a pay to view Site but the shortcut appears to by-pass their security.

Whilst I'm a subscriber to Autospeed I sometimes find something of interest whilst searching and take the short cut. I won't cut and paste their Webpages anywhere.

Give it a go.

 

[chrisman]

there is not much you can do to a valve to help flow.. you can backcut it, and cut the stem down.. there is plenty you can do to the valve seat and throat in the head.. in the pic above one of the major improvements i see is the "unshrouding" around the intake valve.. think of where the valve sits in the chamber as a bowl.. when you unshroud the valve, you open up the bowl area around the valve.. this usually increases the cc of the chamber, but for a FI application, thats usually fine..