Doing some stupid shit to an old datsun head

[nine2nine]

Wow!

[morerevsm3]

spark initiated towards inlet and chamber shaped to promote swirl

[TK]

Nope, chamber shaped to minimize swirl!
Swirl wastes energy, with an inline valve engine there is always plenty of swirl, you want to keep it to a minimum & hold that inertia in the charge.
Have a look at the shape & imagine the valve opening - look at the area between the valve and the chamber compared to the area between the valve & the seat ad the valve opens.

[Tripper]

What flow numbers are you hoping/aiming for

[val245]

Tk wondering if you could give me some advice on getting an alloy head welded succesfully? I made thread in the general section..

[BigMuz]

Awesome dude thank you.

[(pennywise)]

this has given me inspiration for my l20b build....

[9triton]

chamber pressure recovery - space between the valve and head shape approximates aventuri as valve liftss - thus maximising chamber pressure recovery via a better co efficent of discharge and hence cylinder filling

vertical valves are bettr as more wall around the circumfernec of valve - rather than a wedge/ inclined 2 valve which loses the wall on the narrow wedge end.

vertical valves also give better centralised compact chamber and adequate squish ( than inclined 2 valves) for better burn


hmmm - kewpie doll for me ?

edit : sorry boys need to sign up to speed talk:
http://speedtalk.com/forum/viewtopic...15&t=23564edit :

[FLI355]

You've lost your mind. But I like it!!

[Sloth]

tk, have you ever done a 1600 escort x flow head?

[Supashake]

What are you up to now, please explain.

Off road race buggy upgrade. Planing the same engine for my C210 Coupe.

[gxxr]

Tk wondering if you could give me some advice on getting an alloy head welded succesfully? I made thread in the general section..

Mate who has welded up more heads than I've had hot dinners, normally gets them heat treated again if there's been significant chamber work or relocation of valves, normally uses argon/helium mix too.

[Benonymous]

WAA??? Swirl is bad??



So Suzuki twin swirl was all bullshit? Dissapoint....

[stockymcstock]

big squish area!

[TK]

With a 4 valve pentroof head swirl is almost non-existant, if you can promote a little swirl it's a good thing.
But we're talking inline 2V heads here, due to the intake valve sitting against the side of the bore there is always plenty of swirl, more than you want.
Better that energy is used to keep the charge following the piston down the bore, rather than swirling around at the top of the bore & impeding incoming charge.