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Looking for a solid answer. Have been reading everything I can to understand that if your QSM is Re-propped according to the recommendation then should you or should you not be able to run at WOT or is it always a cruise below 18.6 GPH at 2000 RPM? Going off this comment from another post:
“…it is far from OK if you want to help prevent early exhaust manifold leaks or worse… The damage to the turbo’s and manifolds do not happen at WOT, it all happens in the 1800-2000 RPM range where most boats burn over 20 GPH, with 22-24 GPH all too common at around 1900 RPM. This is where the issue is that warps the manifolds and turbo bases.”
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IMO, WOT is for very occasional testing of base line performance for a few seconds max..
The QSM11 engine is a rock solid engine platform, but the dry manifold/turbo system does not do it justice.
The same engine with a coolant cooled turbo & Manifold can run 1000 of hours a year burning 20 GPH at 1850 RPM and will give no grief.
Limit, by proper propping , the GPH at 2000 RPM to 18-19 GPH and you’ll may get some decent life from the manifolds & turbos.
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