1999+ 6.5L marine motor, questions?!?!

NVRENUFF

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I have a new to me 6.5L marine NA motor with approx 4,500hrs on it. It has a little more visible blowby than the old 6.2, but otherwise the motor runs perfect and smooth. I just finished putting a turbo from an 07.5 Cummins 6.7 on it and cranked the fuel up about half a turn. Without the turbo fuel was bumped 1/8 turn and max EGT towing uphill was 1,200*. Currently the WG is set for 14psi max and even with the added fuel it isn't getting over 850*.

I have several questions so please bear with me. Being a 99+ 6.5 marine NA, is this still a lower compression motor? What is the safe boost range for this particular motor? HWY cruising, hills, and even moderate towing it keeps around 10psi and only goes up to 14psi when you stay in it and wrap the rpms higher. Also, what is acceptable blowby? Oil pressure is steady but I seem to burn a QT every 500-600 miles. More than I'm used to, but it's a spotless clean running motor otherwise.

TIA.
 

NVRENUFF

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It has serpentine accessories on it so it's a reverse water pump if that's what you're referring to. It also has the 8qt oil pan, which is how I know it's a 99+ 6.5.
 

porkysplace

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It has serpentine accessories on it so it's a reverse water pump if that's what you're referring to. It also has the 8qt oil pan, which is how I know it's a 99+ 6.5.
I believe he was refering to the crank rotation . Viewing the motor from the front it should turn clockwise. A lot of marine engines turn counter-clockwise depending on the application.
 

NDT

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That would have to be the ultimate fail to go through all the work of de-marining an engine and installing it in a pickup only to have the truck go 65 mph backwards.

I don't have a boost gauge on my 2000 6.5 TD, but I recall safe boost levels being discussed on Dieselplace I think.
 
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