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Home > General Chat > Port Robbing

MikeRace

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Force Racing ICT Dept Manager Miglia Turbo Am frum Yokshyer tha noes!

27th Apr, 2011 at 11:29:31am

Chaps does anyone know where port/charge robbing actually occurs within the port? As in does it occur at the mouth/inlet tract or above the valves? Or both?

Ta

Mike

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/


Paul S

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Formerly Axel

Podland

27th Apr, 2011 at 12:04:02pm

At the point where the ports join/separate just above the valves.

Air flows back out the inner cylinder as the piston starts to rise and goes into the outer cylinder as the piston starts to fall. All helped by the outer cylinder exhaust valve still being open.

Shown graphically here:
http://www.turbominis.co.uk/forums/index.php?p=vt&tid=419783

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

MikeRace

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6549 Posts
Member #: 1149
#1 Basshunter Fan

Force Racing ICT Dept Manager Miglia Turbo Am frum Yokshyer tha noes!

27th Apr, 2011 at 12:07:25pm

Thanks for that Paul, im simply thinking out loud here but have you ever thought of fitting a thin strip of ally that split the inlet manifold which extended into the inlet port somewhat?

Mike

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/


Paul S

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8604 Posts
Member #: 573
Formerly Axel

Podland

27th Apr, 2011 at 12:18:25pm

You could, but that would severley limit the port flow.

Charge robbing only hits performance by 3-4% up to around 7000rpm. Doubling the port velocity would cause far greater loss.

Saul Bellow - "A great deal of intelligence can be invested in ignorance when the need for illusion is deep."
Stephen Hawking - "The greatest enemy of knowledge is not ignorance, it is the illusion of knowledge."

MikeRace

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6549 Posts
Member #: 1149
#1 Basshunter Fan

Force Racing ICT Dept Manager Miglia Turbo Am frum Yokshyer tha noes!

27th Apr, 2011 at 12:19:43pm

I see, thats cleared that up

mike

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/


Asphalt

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Germini, black forrest

28th Apr, 2011 at 09:20:06am



*hehe!*

[X] nail here for new monitor

MikeRace

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6549 Posts
Member #: 1149
#1 Basshunter Fan

Force Racing ICT Dept Manager Miglia Turbo Am frum Yokshyer tha noes!

28th Apr, 2011 at 09:47:16am

This was the inspiration of my thoughts tbh.

1/4 Mile 14.3secs 96Mph Terminal 10psi of boost.


Fibreglass Parts? - http://www.tdkracing.co.uk/
Split Rims? - http://www.force-racing.co.uk/


wil_h

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Betwix Harrogate and York

28th Apr, 2011 at 10:18:12am

They're small bore heads of course.

Fastest 998 mini in the world? 13.05 1/4 mile 106mph



On 2nd Jan, 2013 fastcarl said:
the design shows a distinct lack of imagination,
talk about starting off with a clean sheet of paper, then not bothering to fucking draw on it,lol

On 20th Apr, 2012 Paul S said:
I'm mainly concerned about swirl in the runners caused by the tangential entry.

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