Adding a turbo to a high cam lift engine

[Evoluzione]

Beejayhay said:

One of the guys on GT4OC is putting out 700hp on a 5SGTE BEAMS engine which is VVti ...that's at the wheels! Build thread here.... http://www.alltrac.net/phpBB2/viewtopic ... a627220c7b

Link doesn't work.
The Beams is quite a special engine, the heads are something else - beautiful pieces of work which flow amazingly well, probably one of the best of its era.

Edited by Evoluzione on Thursday 11th February 17:18

[Beejayhay]

Evoluzione said:

Link doesn't work.
The Beams is quite a special engine, the heads are quite something else - beautiful pieces of work which flow amazingly well.

soz.... http://www.alltrac.net/phpBB2/viewtopic.php?f=44&a...

[reggid]

So what sort of pressure differentials does one see around peak piston speed of the cycle at peak hp? and how does this compare to a NA engine of similar configuration?

Max_Torque said:

reggid said:

anyone used pressure equipment to measure cylinder pressure and port pressure to see whats happening in a turbo engine during induction regarding pressure ratios??

Yes, pretty much every day for the past 20 years! We run high speed (10Khz bandwidth) water cooled piezo pressure sensors directly on the intake and exhaust manifold runners to record an engines real time pressure ratio, and generally to provide validation data for the fluid dynamics modelling and to validate the EGR systems (internal and external) performance etc

Edited by reggid on Thursday 11th February 20:42

[227bhp]

Pumaracing said:

YankeePorker said:

High lift valve engines are obviously designed to improve cylinder filling on normal induction engines. In theory the pressure developed by a turbo in the inlet manifold reduces the need for higher lift valves, improving the packing just by increased pressure differential.

Ick!! Read this.

https://web.archive.org/web/20110918115242/http://...

Doesn't the air move through the port at a higher velocity once it has become pressurised by the turbo? I think it does.