Exhaust Manifold

[Smoke them tyres]

Any idea on metal spec used (re durability?)

[Muzza]

Looks the goods,

dam now I got too start saving more $$.

Muzza.

[fordboy1981]

what difference does a single and double entry manifold make?

[bcl]

what difference does a single and double entry manifold make?

Twin/double/dual entry will spool up better. The focus is to have 2 sets of exhaust gas pulses, and the avoidance of gas interference and conflict from one side to the other.

Brian

[fordboy1981]

Twin/double/dual entry will spool up better. The focus is to have 2 sets of exhaust gas pulses, and the avoidance of gas interference and conflict from one side to the other.

Brian

but I presuming they either cost more or don't have the same top end?

[ETM]

twin scroll turbine housings are said to spool faster but in real life you would be lucky if you could notice the difference.

they are also much harder to achieve a perfect wastegate feed setup,space becomes more of an issue.

generally I like an open housing every time.id rather suffer a tiny bit more lag (which can be more than reversed with a good manifold) and have excellent boost control than the other way around

[Smoke them tyres]

metal spec? 304 stainless? other?

[turbotrana]

unless back to back testing is done its hard to say how much benefit a twin scroll gives.

The main reason I started using them was to minimise gas reversion and detonation on a log manifold. I think it did its job well.

I have built split tubular manifolds but think the benefits are less due to reversion being more difficult because of the long runners so maybe its not as necessary. And its much greater pain in the ass to make as IMO you must keep it split to the wastegate so theres only 40thou gap to the w/g valve for it to work properly

There must be a reason why garret has made the TO4Z in split pulse turbine

I make mine in 316 stainless 3mm wall thickness with steel flanges

Edited 08/01/08 01:42 PM by turbotrana