1uzfe vvti head port pics, bench flow data, intake port theory

[ed]

although the porting figures have already been posted, i thought id throw up a new thread with the pics, numbers and a link to a full tech article for those who might be interested.

tech article: http://www.v-eight.com/

pics:











Flow figures:



cheers
ed

[cambelt]

Looks like someones been out in the shed till all hours on those ports .
looks nice , were the ports rough before you started .
I would like to think toyota had made a better effort with there vvt i models.

[ed]

hey mate...
i paid mark to do these heads for me (same guy who did daves 2jz head)

i swore id never port another head after that 7m!

cheers
ed

[Celica RA45]

hey ed do you wont pics of the vvti head of a 3sge to compare with yours

[ed]

surely yes!

email: [email protected]

can you send me your phone number again too please glenn?

[Draven]

ed, would you mind me enquiring how much that cost you?
there's always the possibility the 2j might get this treatment

[Mr DOHC]

is it just me or do they look like golf ball skins

might be the light but they LOOK rough

[ed]

its the flash

greg - call me

[Enchanter]

Slightly off the uz porting I have a basic porting question from the example below.

Why not fill in areas 4 and 5 to reduce losses, I imagine it would be rather turbulent there, especially at 4. Filling it in should also increase flow velocity.
Obviously there are answers to my question somewhere, I just dont know them

Cheers, Tim

[gianttomato]

They will do that (and more). Just depends on how fast you want to spend....

[Enchanter]

Anyone know for interest sake if anyone has played with valvestem shapes that are not round or is this too impractical ?
I cant see why it wouldn't work, you would only need to shape the lower half and somehow stop the valve from spinning.

[Mr DOHC]

i'd be throwing that head back at them and making them clean the face of it, looks like they didnt CRC the face after it'd been washed, or will more work still be gtting done

[Bored?]

Anyone know for interest sake if anyone has played with valvestem shapes that are not round or is this too impractical ?
I cant see why it wouldn't work, you would only need to shape the lower half and somehow stop the valve from spinning.

On the page it mentions shaping the valve stems, but I presume it actually means the valve guides, judging by the pics.

However, reading it also made me wonder about the same thing -- would an aerofoil-shaped valve-stem (at least in the region of airflow) be useful?

Of course, if you're getting that radical that the valves can't rotate, why bother using circular ports? Surely some other port shape would make better use of the available space?

I guess you can't lap in a valve that isn't round, so you'd need much better machining abilities to make it work.

[gianttomato]

i'd be throwing that head back at them and making them clean the face of it, looks like they didnt CRC the face after it'd been washed, or will more work still be gtting done

Needs more work. They still need to be washed.

[Mr DOHC]

ah, good GT

On the page it mentions shaping the valve stems, but I presume it actually means the valve guides, judging by the pics.

However, reading it also made me wonder about the same thing -- would an aerofoil-shaped valve-stem (at least in the region of airflow) be useful?

Of course, if you're getting that radical that the valves can't rotate, why bother using circular ports? Surely some other port shape would make better use of the available space?

I guess you can't lap in a valve that isn't round, so you'd need much better machining abilities to make it work.

in the intake side of my RG there is no VSS protruding, they have been completely removed from the port