QSL dry exhaust

[Mark Wanderer]

I am in the process of repowering my 36’ Lobster boat this winter. Removing a 3208 cat and replacing with a QSL9 450. My boat is currently set up with 6” dry exhaust. I have a few questions with the design of the new dry exhaust coming off the QSL turbo.

I need to change direction 180deg to get the exhaust pointing to the existing piping on the port side. Would a 6’ run of 4” pipe (2 short radius elbows, flex belly, straight pipe) be too much back pressure on the QSL? I plan on using a 6”/4” concentric reducer to get me back to the existing 6” pipe.

My Cat turbo points straight aft with a direct 4”/6” elbow to 6” wrinkle belly to bring me to my 6” piping. I would like to use the 4” with the QSL to save some space and ease of fitting. Thoughts? How do I attach pics?

Thanks

Topic

[Tony Athens]

So, do you want a WET port side exit exhaust or ?     

Spent some time this weekend and go thru this link–You will some something close to what you want…………………99.9% of all is custom fit you your boat is you want it right

https://www.sbmar.com/category/articles/exhaust-systems/

 

 

 

[Mark Wanderer]

QSL

This is not my engine, just a pic of a QSL with a wet exhaust that mimics the run I will need to make. I want to use two short radius 90s off the turbo to get the exhaust pointing to port side. Wrinkle-belly and straight pipe combo to a 4”/6” concentric reducer to get me to the 6” flange.

[Mark Wanderer]

Cat exhaust

I would like to remove this 6” flex pipe and have new 4” pipe for QSL to bolt up to the existing flange

[Mark Wanderer]

Finally figured out how to post pics. I’m new to the forum. This is the arrangement with the cat exhaust.

[Tony Athens]

Pictures and sketches needed to understand your plan.. You have it pictures in your mind, but no one elses..

Tony

[Author]

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