[Ecotec] Ecotec intake manifold, restrictive at 291rwhp

[Tsunamix]

Fair point. But.. the base line for the port floors is taken from the same point for each.

When I get home Ill check port heights compared to the base line.

It's also possible something else is out of alignment...Like my head/eyes/drinking hand which is the opposite to my grinding hand

 

[Immortality]

There probably isn't much point going to hard on the exhaust port, most of the restriction would be around the bowl and valve guide.

 

[Tsunamix]

FYI port top is within 0.1 mm of 53.98 mm from the plug flange machine mark on all ports (using a vernier caliper and tip extension)

The heads look like they are fly cut at the factory to ensure mounting height of plugs is all the same. or something.

I checked it our fairly well before I started, estimating distances from deck height etc, but the photos I have really do suggest something is out of skew on this head.

Not going to spend too much time on this now, just going to set port top height to 51.5 mm and open up the bottom a bit more.

More heads coming, will start a new thread and try and do a real build on em.

 

[delcowizzid]

ive been playing round with a couple of buick heads roughing out some test ports.flow bench was so helpfull ive gained a heap of flow just getting the air to exit around more of the valve than stock.they were pretty bad for favouring the port floor and only about 1/3rd of the valve really flowed a decient amount of air.

 

[Tsunamix]

I've done something very similair on the ughotec inlets.

I know that boundary layer flow makes the exhaust tend to stick to the port floor a bit, but genereally the gas flow should head more to the port roof than the floor, as it's pressurised around the valve, and will flow in a doughnut shape out around the valve opening itself, then get guided back to run almost along the valve stem.

I think that spending heaps of effort on the port floor will be wasteful, hence working the port roof.

 

[Lawther146]

will we finally see the walky manifold on and running?!?!?!?!?!!! doooo it!

i've never heard of the manifold being a restriction!

Where would i get one of these

 

[Immortality]

I don't think those Walker ecotec manifolds ever went into production so I doubt you will ever find one.

 

[LSV MALOUF]

Port matched correctly with l67 gaskets a small cathedral arch porting and removing some meat from valve stem and a small convex behind the seats , mace spacers and stock throttle and a lil boost 350 hp is cheap and easy ,for anyone interested I'm building a variable capacity long ram plenum and slide throttle for l36 but I need a new metal melting sticking thingy ! the manifold sorta works like an Su or ISO carby so it'll have response and top end no throttle body needed

 

[BowTie]

6x fly by wire tb's mounted directly on variable length servo controlled runners?

No plenum.

 

[woteva]

Mmm very sexy addition for your ecotec
http://www.proflowfab.com/performance-products/inlet-manifolds/