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manbridge 74's Avatar
Join Date: Jul 2011
Location: CO
Posts: 6,008
Drill 2.4 MFI throttle body idle passage 3mm to 4mm?

A 2.4S tb idle passage measures 3mm and I need to know what might be gained or lost by enlarging them to 4mm on an engine built to RS spec. I believe the 4mm size info comes from Henry but I can't find a source for this info from Porsche.

Maybe with today's gas formulation it is moot? Anybody have any thoughts as to why a 4mm hole would be needed only on the RS spec engine?

And I searched for a long time on this one....
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
Old 08-22-2016, 07:59 PM
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Join Date: Jan 2012
Posts: 1,019
More air for the idle circuit in the larger displacement engine is my guess

I did something similar on my hot built MFI spica alfa motor
Old 08-23-2016, 09:13 AM
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