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Beg4wake So you posted a few good things from the PCM manual, but I started my post with "I believe" which should provide anyone reading my post evidence that I was expressing my opinion about the subject at hand, and I did not quote from any PCM or other materials. It's your money and pricey engine upgrade, do what you want, but proceed with caution regarding anything "learned" from a public forum.
That said, after a little research I found that the "stock" boost level on the 550 engine is approx. 9psi, couple that with the base compression ratio of 9.1:1, provides some basic info that this engine will run on 87 fuel. It won't make the rated power level because the ECU will "retard" the timing to prevent detonation. I don't recommend that practice, merely stated that if you were caught in a pinch on a weekend without access to premium or 93 fuel that you could "get by" running the boat on standard fuel.
I don't know what PCM recommends or not in regards to "additives, oils, etc." but I do know that for several years PCM did NOT recommend synthetic lubricants for their engines, this may have changed recently, but their stance was a defense for PCM against shoddy synthetic lubricants on the market. For most anybody seriously into any kind of internal combustion engines, synthetic lubricants are used to protect some pretty serious equipment. I offer this as some info to understand what PCM needs to control to keep warranty claims(and perceived performance/reliability high) minimized when products are in the public domain, thus they know what products work from their testing and development
Further this base engine comes equipped with piston oil cooling "squirters" (oil sprayed from con-rod to the bottom of the piston dome) which should help keep the pistons from overheating and thus failing prematurely due to detonation. (although this engine doesn't come with the forged pistons which would be better).
Anyway, again, I must reiterate I'm not stating it's ok to run one of these 550 supercharged engines in your packed w/crew and fully ballasted boat with any fuel not specified by PCM/CC, just merely putting some info out there for casual reading...
That said, after a little research I found that the "stock" boost level on the 550 engine is approx. 9psi, couple that with the base compression ratio of 9.1:1, provides some basic info that this engine will run on 87 fuel. It won't make the rated power level because the ECU will "retard" the timing to prevent detonation. I don't recommend that practice, merely stated that if you were caught in a pinch on a weekend without access to premium or 93 fuel that you could "get by" running the boat on standard fuel.
I don't know what PCM recommends or not in regards to "additives, oils, etc." but I do know that for several years PCM did NOT recommend synthetic lubricants for their engines, this may have changed recently, but their stance was a defense for PCM against shoddy synthetic lubricants on the market. For most anybody seriously into any kind of internal combustion engines, synthetic lubricants are used to protect some pretty serious equipment. I offer this as some info to understand what PCM needs to control to keep warranty claims(and perceived performance/reliability high) minimized when products are in the public domain, thus they know what products work from their testing and development
Further this base engine comes equipped with piston oil cooling "squirters" (oil sprayed from con-rod to the bottom of the piston dome) which should help keep the pistons from overheating and thus failing prematurely due to detonation. (although this engine doesn't come with the forged pistons which would be better).
Anyway, again, I must reiterate I'm not stating it's ok to run one of these 550 supercharged engines in your packed w/crew and fully ballasted boat with any fuel not specified by PCM/CC, just merely putting some info out there for casual reading...
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