there are dual purpose batteries (starting and deep cycle). however generally starting batteries have thicker plates, deep cycle batteries have more thinner plates.
using a deep cycle as a cranking battery works until the cranking load overheats the plates and they warp, shorting out your...
You have to make test drills into the transom and stringers (from inside the bilge, about 2" up from the inside hull surface)
Drill a 5/16" hole about 3/4 deep (8mm x 19deep) and look at the shavings.
If the shavings are light colored, dry and smell of fresh cut wood. Seal the holes, you are...
5-cylinder VW 2.5 liter marine diesels are rated at 165hp. to get to 180, very slight boost in fueling is needed. most of the available electronic tweeks push it over 200hp
https://www.ptronic.com/performance-chip-volkswagen-marine-tdi-165-5-165.htm
bolting the two together is the least of your issues. getting a GM V8 PDS housing for a 280 and the adapter you mentioned.... just money and wrenching
the water cooled marine manifold and turbo housing is the hurdle that you need to clear first.
the last water cooled one-off manifold that I...
pretty sure the rev limiter in the software is near 5100 RPM. IIRC its a soft limiter on the EFI motors that simply starts cutting spark and fuel by a few cylinders at a time.
