NoPistons -Mazda Rx7 & Rx8 Rotary Forum - One More....1st Time Porting...please Critic

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[quote name='z8cw' date='Dec 12 2004, 02:41 PM']

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It is fun but what a mess. The dust goes everywhere. I look like a coal miner. What do you think, large enough?

Thanks

CW

I square off the upper/outer corner of the port just a bit more, and then radius the closing line and polish it.

When you move the outer edge of the port you get earlier opening, and you loose support for the trailing end of the side seal. As time goes by the end of the seal gets pinched in the corner radius and gets rounded off a bit. If you take away that curve and radius and polish the face of the closing line, the end of the seal cannot get pinched. It probably only happens at cranking speeds, but it happens.

Lynn E. Hanover

Lynn,

thank you for taking the time and posting those pics with the explanation. that's great, it really makes it easier to understand things.

Quote:

Originally Posted by Lynn E. Hanover' date='Dec 14 2004, 08:46 PM

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Thanks so much, will do.

I am just wondering about the bevelling. The last 1/2inch of the port looks like a gigantic bevel. I was trying to get the latest possible closing without breaking through to the water jacket, so I ended up with a hill kind of shape. I tried to lighten up the pic a bit but you can't really see it.

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