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Registered
Join Date: Oct 2006
Posts: 315
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MFI-measuring pump control rod
I have noticed when measuring my pump control rod to 114mm that my ball sockets(caps)are not spherical. They have a flat spot machined on the end, but otherwise they are rounded (spherical). Is this normal? It appears that this flat spot reduces the measurement of one socket at least .50mm.
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07-17-2011, 02:20 PM
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Max Sluiter
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The measurement is center to center.
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1971 911S, 2.7RS spec MFI engine, suspension mods, lightened Suspension by Rebel Racing, Serviced by TLG Auto, Brakes by PMB Performance |
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07-17-2011, 08:13 PM
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Registered
Join Date: Oct 2006
Posts: 315
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The MFI manual measures the total length, sockets included,then measure the width of 1 socket and subtract that from total. This gives a more accurate center to center measurement as the sockets face opposite directions. I can eyeball it pretty close, but, the tolerance is only .2mm which is hard to see. One spin on the socket cap changes measurement by a little over .8mm so I guess I'm pretty close where it now is.
About five yrs ago I measured the rod as the Manual suggested, corellated TB' and linkages and adjusted AFR. Now that all has changed as I noticed the flat spot on caps. The rod was almost 1 mm longer which probably gave me better off idle transition but I'm wondering if that gave me a over center TB position at 7000RPM? My linkages to #2 and #5 also had to be shortened. Has anyone else noticed the flat spots? |
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07-18-2011, 03:37 AM
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1971 Porsche 911S
