Intake wall wetting and intake pulses strength

[boofhead]

So furthering my hunt for good tech - he is a great video showing how much
wall wetting occurs in carbi topped intake system. In addition it shows the force of the intake pulses that are occurring.




BTW: If you are enjoying these please say so. We are the tech site after all.

[Shaunp]

A lot of fuel isn't there, moving around.

[boofhead]

Yes - interesting upward movement in places from which I assume is reversion and then you see fuel running down the ports from heavy pooling. Easy see how a port injection EFI system is better at fuel metering especially at lower RPM and partial throttle.

[Nuts]

Awesome.

[Shaunp]

Having said that V8 super car engines I've seen actually inject at the top of the ram tubes not at port level, the spray it into the air flow but then I guess they are not looking for any power down low.

[nassi]

Very enjoyable thanks Boof, it could be a little better though.....
How about you replace John and his finger with a suitably un-attired female technician?
Just a thought.

[xpconnor]

So when you back off the throttle what happens to all that excess fuel that seems to be in the manifold? Is that why you get a black puff of smoke when you back off the throttle? Or is there fuel like that sloshing around even at low RPM?

[ants]

Having said that V8 super car engines I've seen actually inject at the top of the ram tubes not at port level, the spray it into the air flow but then I guess they are not looking for any power down low.

Not sure how they do it now, but I believe F1 in the past had a bank of injectors mounted in the air box. Apparently at the revs they were doing, if they mounted them in the ram tubes the injectors couldn't be opened for long enough to supply the required fuel, shut off and have time to open again for the next compression stroke. Instead with the injectors in air box they are pulsed like an idle control motor and put out a continuous fuel mist into the air box to mix with the air befor going into the engine.

[Pinto-Pete]

So when you back off the throttle what happens to all that excess fuel that seems to be in the manifold? Is that why you get a black puff of smoke when you back off the throttle? Or is there fuel like that sloshing around even at low RPM?

Or flame out of the exhaust on over run...

[Pinto-Pete]

Jon Kaase the man is the guru of ford V8's especially 385's and yes Boof keep up the good work with the vids most informative...