Lynn,

I think I know which parts to order to rebuild the 2nd gen P Port.  I will stick to the stock Mazda parts and get the Mazda solid corner seals.  A third gen oil pump might help.  I have yet to finalize the injection system but am leaning toward megasquirt.  Any helpful suggestions would be greatly appreciated.

Joe Berki
Limo EZ

---- Lehanover@aol.com wrote:
> The rubber plugs vanish if you operate at high power settings for very  
> long. They just barely last in a street engine. Some usually gone on each tear  
> down. That is not the problem. The
> plug style corner seal is not very strong. All are powdered metal and under
>  great stress, like a detonation event will crack. I have never found a
> stock  solid seal broken. I have found the plug style broken many times. Just
> order the  early solid corner seal. Not an after market solid seal. Mazda
> makes the best  pieces in most cases.
>  
> Chatter marks are from warn apex seal grooves, low spring pressure,  
> overheated apex seals, low or no apex seal lubrication.
>  
> Failed compression "O" rings have been over heated. I have never used an  
> aftermarket "O" ring but as an emergency for a one weekend engine I have used
>  Teflon or Kapton insulated 18 gage aircraft electrical wire as an "O" ring
> along  with a very small bead of silicone in the groove.
>  
> It is nearly impossible to get the water "O" ring to fail. (the outer black
>  one).
>  
> Ran that engine all year since it was not leaking at all. I always use the  
> stock "O" rings, and even reuse them many times. 99% of the sealing is just
> the  clamping forces between the housing and the iron.
>  
>  Racing Beat says to use 32 pounds of torque on the case bolts in  boosted
> engines. Also no split timing, and not more than 12 degrees of advance  in
> ignition timing. I would suggest over-rich mixtures for racing and full  
> throttle climb out from low altitudes. Keeps things much cooler. More apex seal  
> lubrication (if premixing). And even with Richards top oil adaptor I would  
> premix just a bit more oil. The distribution is just much better in a
> premix.
>  
> On street ported engines never turn them backwards unless you know that the
>  builder radiused the bottom of the port to pick up the drooping trailing
> end of  the side seals.
>  
> Lynn E. Hanover
>  
>  
>  
>  
> In a message dated 11/5/2011 1:14:51 P.M. Paraguay Daylight Time,  
> keltro@att.net writes:
>
>  Concerning the corner  seal rubber buttons it seems that they end up
> reverting back to carbon  and
> lose all elasticity (particularity under high  heat) and become useless for
> their original purpose  which
> was to give slightly  increased compression at starter speeds...........I
> personally will use the  solid
> racing corner seals  available from Mazda and other  
> sources.................IMHO
>