09-07-2010, 12:34 AM
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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 tomnik
take care that the additional supply bore does not get in conflict with the lub grooves and the control edges. Btw. does the plunger reach this bore at all as it is below the original bore? Then when the lower bore is filling the element and the plunger moves upwards it will pump the fuel out of the upper original bore?
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The new bore will be the same diameter as the original, "Control Bore", and the top of the bore will be located .010 inches lower than the top of the "Control Bore". It will be clocked to be free of the end of injection control edge and lube grooves.
The original, "Control Bore", will be the last to close as the plunger goes up, and the only one that will pass fuel at the end of injection.
This additional hole is intended to provide an additional bore to aide in filling at high speed as this element has a smaller dia bore than the other 10mm elements I have.
I like the smaller bore because it will close sooner, (less plunger travel), and less fuel will be pumped in and out of the element from bore opening, to the start of injection. This will allow for a shorter stroke cam.
Quote:
Originally Posted by tomnik
The thing I would do is to measure the peak pressure first in the hard line with different nozzles. This will provide an idea whether the volume of a 10 mm element can go through the nozzle within the time at all.
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I agree. The goal is to be able to controllably deliver fuel in quantities from idle to about 90cc. The issue that concerns me is the spray pattern at the upper end of the delivery range.
It appears that the rate of delivery of your 7.5mm elements with the M pump cam works very well in NA and turbo applications. I am curious to see if there is a magic delivery duration, that if shorter, power is lost. If that is the case. I can reduce the rate of delivery via the cam profile.
Quote:
Originally Posted by tomnik
Any information from jeemu on PC bore diameters/modification?
Tom
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Nothing other than his last post.
His 60X prechambers have more 3.5mm holes to drill out than I had in my 617 Prechambers. I did not have a chance to touch the IP before I sold the car, but I did see a reduction in EGTs at high RPMs, and the feel of increased torque when the alda started increasing fuel.
I did not notice anything different about the turbo, but I had stock fuel settings and I think the waste gate was not sealing as it should.
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