Guys,
It would seem the root of all my engine sealing troubles may revolve around my intake/injector setup,or more to the point...the bore wash it could be causing.

Possible reasons to believe intake and injector setup is causing bore wash:

-The 560cc injectors(OE is 280cc) are mounted in the stock location close to the valves,they are a split spray mitsi evo 7 injector and are mounted in the approx same location at the same fuel pressure on a evo7,however im not sure where the spray pattern actually hits,ideally the back of the valve or so i have read. it is possible that these are not far enough back to atomize.

-Very short intake runners that are a larger diameter than stock,so i would imagine low air velocity/cylinder filling at low rpm would not help the fuel situation.

-Tuner noted quite a lot of fuel is needed to hold a smooth idle and on cranking!!

-Small amount of black smoke throughout RPM under WOT,even though mixtures look good...hmmm but dont oxy sensors read oxy,they dont read fuel left over on the bore???.

-Engine hesitates once only under boost after idling/cruising in the lower rpm band for a few minutes,(suspect fuel buildup around rings etc)

-Every engine build has ended with fuel in the oil,never any broken rings.

Are these good enough reasons to believe we have fuel ending up around the rings?...if anyone has any experience with bore wash and it wasn't a failed injector please share!.

My plan if i go through with it is to remake my intake plenum with longer runners to allow a secondary injector setup,we would use stock injectors with an additional set of say 300cc up stream,has anyone here ran this sort of setup and were there implications around bringing the second set on smoothly?. other questions are where to locate the secondary injector from valves and how long to make the runners!??.

Its a fairly big undertaking to accomplish this as i need to change nearly everything even the ECU needs changing as i will need 8 injector outputs,new fuel rails,all plumbing on that side not to mention many hours more on the gold plated dyno.

I guess the big question is do you guys think there's enough evidence there to warrant doing all this work?...what if it ends back where i am now?...if mitsi's can run 400hp effortlessly im sure the M111 can...geeez why must it be so hard^^.


Cheers,
Paul

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