11-15-2008, 09:25 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 tomnik
the ball can be pushed out from one side. Mark the position before.
What are your plans for PC mods?
Tom
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See post #26. Main objective is to increase PC VE and possibly reduce some thermal losses to the cooling system( keep the heat is the gasses not the block).
Regarding the reflective coating:
If the thermal coating was on the outside of the PC, the PC temp would remain at a higher temp between ignition cycles due to the reduced thermal conductivity to the head. This would help vaporize large amounts of fuel quickly which is one of the benefits of the PC, (allowing for a higher operating RPM compared to DI engines) but it might cause the PC to over heat.
I have two theories:
One theory I have is that if the outside was coated and the PC body could not transfer as much heat to the head, the PC would, 1) only reach the max burn temp, and 2) the PC would be cooled by the vaporizing fuel. The more fuel the more heat and the more cooling. It might be the way to go but if the material that the PC is made from can't take the temps, a different material could be used.
The other theory I have is that if the inside of the PC was coated, the PC would not get as hot and preheat the air inside the PC, (before compression). Cooler air is more dense=more oxygen. This is a difficult argument with a diesel because it relies on hot air. It would be the same argument for an inner cooler. Keep the air as dense as possible. But there is so little time from the point where fresh air starts being pushed into the PC to the point that the pressure raises the temp that it really is not even practical to even consider it .
Having just reviewed this, my new thoughts are that coating the inside would not be beneficial, even with a hot ball. I bet it would run like a cold engine all the time and would not handle lots of fuel well.
If it seems like I am contradicting myself , it is because I am. I try to identify as many sides and aspects of an idea (pros and cons) before I decide on a plan of action. That is where everyone comes in. Any thought or idea, regardless of how frivolous it may be, helps insure that as much as possible has been thought of.
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