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Old 02-06-2020, 02:26 PM   #23
sunchaser
Guru
 
City: Carefree, Arizona
Vessel Name: sunchaser V
Vessel Model: DeFever 48 (sold)
Join Date: Apr 2008
Posts: 10,186
Bypassing an inter cooler on Lehmans and Perkins Sabres (and Cat clones) is a relatively simple plumbing job. I had to do this once until boat back to home port due to a leaky after cooler. I was able to compare engines with and without inter cooler at real time. The biggest difference was higher inlet temperatures at normal cruise RPM with difference escalating as RPMs increased. Cooler charge air at any RPM is a plus and I chose not give that nicety up, thus installed a new after cooler.

Personally, I'd not run without the inter cooler in service for a long period unless I re-propped to suit the lower HP and reduce over loading. But, we really use our boat. For a low hour vessel docked mainly it may be a different decision.

Baker's point about over fueling is likely correct. I'd dig deep even if AD says engines are same whether Inter cooler installed or not from factory. On our engines the fuel settings, raw water pump, CCV setup and injectors are HP specific.
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