04-02-2009, 07:58 PM
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10mm MW
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Join Date: Sep 2008
Location: Michigan
Posts: 794
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Quote:
Originally Posted by ForcedInduction
Yes, that is very low pressure. The pump should be able to make well over 30psi at idle.
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The spring that came in the new lift pump generated about 13 lbs of force just before coil bind which is @.900".
The free length of the spring is 2.450" and the installed height of the spring is 1.425"+-. The witness marks on my old pump suggests a piston travel of .250"+-.
The piston dia is .865 (measured quickly with calipers) and has an area of about .587 sqin.
If we were to say the area was .500 sqin for simplicity, and if the spring was at coil bind, the most pressure the pump could make would be 26 psi.
The spring I am getting has a free length of 2.5" and a rate of 25Lb per inch rate. It will be able to generate the pressures I want and will be able to keep better contact with the cam at high speeds.
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