PP side/center plate intake port filling?
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Joined: Aug 2004
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From: South Coast, England
PP side/center plate intake port filling?
When preparing the side plates(housings) and center plate(housing) when building a PP engine, is it important to fill the original intake ports with devcon or similar, or can you leave them empty?
I have seen engines just using a blanking plate, what is the advantage of filling the ports? If the ports are empty, will a slight vacuum occur as the rotor passes over the ports? Or is it to reduce the likely-hood of unwanted air leaks on the intake stroke?
Or have I missed the mark altogether?
I have seen engines just using a blanking plate, what is the advantage of filling the ports? If the ports are empty, will a slight vacuum occur as the rotor passes over the ports? Or is it to reduce the likely-hood of unwanted air leaks on the intake stroke?
Or have I missed the mark altogether?
OBEY YOUR MAZDA
Joined: Oct 2002
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From: Denmark
From what i have read on this forum and on nopistons.com, filling the intakeports creates less turbulence around the portarea.
There is a reason that even Mazda fills them, im in the process of making a PP motor and plan on filling them with Devcon aluminum thingie
There is a reason that even Mazda fills them, im in the process of making a PP motor and plan on filling them with Devcon aluminum thingie
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Joined: Jan 2004
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From: Colorado
The disadvantage of filling the ports is obviousely that the filler might break lose. It has happened before....
As a side note anyone knows if a PP with sideports has been attempted. I know about the cross or semi pp with smaller pp ports but haven't heard about anyone ever attemptiong a full PP with the sideports in parallel.
As a side note anyone knows if a PP with sideports has been attempted. I know about the cross or semi pp with smaller pp ports but haven't heard about anyone ever attemptiong a full PP with the sideports in parallel.
OBEY YOUR MAZDA
Joined: Oct 2002
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From: Denmark
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From: Colorado
Originally Posted by Kim
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Joined: Sep 2003
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From: BC, Canada
I'd immagine that filling the side ports would give you a much better seal for the side seals and longer seal life. I can't see how a full PP motor could run with side ports too, it would be way too much port and if the motor would run, it would probably not make much power and run like crap.
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Joined: May 2001
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From: Cleveland, Ohio, USA
Originally Posted by Black91n/a
I'd immagine that filling the side ports would give you a much better seal for the side seals and longer seal life. I can't see how a full PP motor could run with side ports too, it would be way too much port and if the motor would run, it would probably not make much power and run like crap.
It is assumed that the side ports would be covered off at the ends if they were left unfilled.
And if you fill, you do NOT go NEAR the sealing surface of the housing, in case the stuff expands and the rotor starts chewing on it. RB recommends 1/8" from the surface. I went 1/4-1/2". No kill like overkill.
Some of the Aussies like to weld the side ports up and then have the housings resurfaced. As long as you are using a simlar material and are careful, that might be a nice way to do it.
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