And now for a healthy engine….
We all saw Mason’s Viggen engine all mashed up and golden brown like a nice toasted ham and cheese sandwich, now it’s time to get a little more learned about how a nice lean one looks and works.
Specifically, we’re talking about how fuel gets into a Saab 284L engine, the V6 in the Saab V6 Aero. TedJS is a GM World Class Technician and professorial type at Tri-C - a community college in Ohio. He was preparing a lecture on fuel injection when he saw Mason’s post yesterday and decided to send these through.
Apologies for the brief comments only, but these were done on the fly:
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Upper intake removed:
There is the fuel rail – check out the heat reflective tape that is around some of the injectors and connectors.
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Close-up of injector going into intake port
Lower injector o-ring provides seal against vacuum leaks:
There is the fuel rail fully removed from the intake:
And taken apart (you are looking at a removed injector and the fuel rail pressure sensor). The pressure sensor is used as an input to the computer to control the variable speed pump.
Here is the injector:
Fuel leaves the injector and is atomized here (broken down into really small parts so it vaporizes)
So where does it go? Right here: the lower intake manifold (containing the injectors) is now removed (those are some monster intake ports!)
Same view with gasket gone:
Close-up of the intake valves – this is where the fuel is sprayed into the cylinder. When the valves are hot they help keep the fuel in a vapor form:
Upper intake removed from engine (you can see the injector ports and intake ports):
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Ted isn’t taking apart his own engine for the class is he? That would take a real dedicated teacher to do that.
Now that makes the engine look easy to work on. I’ve always known that “if someone put it together, somebody can take it apart.” But seeing those pictures are good confidence builders. Thanks.
BTW, where can I sign up for classes?
They’re always easy to take apart with the engine out of the car… It’s the stupid car that always gets in the way. (Anyone who’s replaced a coolant pump in a 9-3SS knows this all too well)
Hi Andy - summer session starts at the end of May. I have not let the students work on ‘my’ B284L’s just yet, but with a smaller summer class I might just let the right person learn about one with some gentle supervision.
Too bad Ohio is a state away from IL, or I’d be signing up for that class!
The pictures are GREAT! More please!
Oh, and is the V6 a quad-cam’ed engine? I see the pair of cams on the far side of the pictures, so I’m assuming that the other 2 are under the cover on either side of the spark plugs. Right? Thanks again!
fascinating post. thank you for the detailed analysis and pics!