View Single Post
JFairman JFairman is offline
Registered User
Join Date: Jul 2006
Location: S. Florida
Posts: 7,274
The first thing I noticed about that modified Carrera manifolds is the sloppy amatuer aluminum tig welding.
Hope you didn't pay anyone to do that because thats the ugliest tungston inert gas welding I've ever seen.

Second is how the second injector bung on the far left is positioned in the runner. The fuel spray from the injector pintle is conical.
Looking at how that injector bung is positioned half the fuel spray cone is aimed directly at the side of the runner because it curves sideways just below the second injector.

That's NFG because around half the fuel spray from the injector will hit the inner wall of the runner. That part of the fuel spray will hit the runner wall and wet out and run down the wall into the intake port and combustion chamber as liqued fuel instead of remaining atomized fuel in the airstream.

Some 935's with high butterfly injection aimed the mechanical injector upwards against the airflow to keep that from happening and atomize the fuel better.
Old 07-21-2010, 10:51 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #11 (permalink)