6.2 headers

[Sharecropper]

250hp and 450ft lbs torque naturally aspirated?

Yep. That is the spec of the P400. It is the engine for the new upfit NXT360 HMMWV which weighs over 15,000 pounds. Watch my rebuild thread for photos. Engine is due in here within a few days.

 

[Ilikemtb999]

I thought the p400 was 250hp/550ft lbs

 

[red]

Diesels cannot have valve overlap, the pistons would hit the valves at TDC. High compression ratio. ..so the value of headers is minimum to start. Headers work to reduce back pressure at higher engine speed dynamically. This increases volumetric efficiency at higher speed. Speeds which are limited by diesel injection speed. So exhaust manifolds are designed to reduce low speed restriction without attention to scavenging. The runners would have to be very long to be effective and at that, the benefit is nil.

All diesels have far more valve overlap than gasoline engines, part of the reason why they are so much louder. Couple pics from the book are easier than tearing apart an engine to make a video.



As to headers, agreed there really isn't much of a point to them on a diesel when they respond so well to a turbo.

 

[LT67]

I thought the p400 was 250hp/550ft lbs

I can't seem to find any conclusive numbers whether naturally aspirated or turbo charged online anywhere.

 

[Iceman3005]

According to AMG, it's 250 hp and 550 ft. Lbs. N/A. Add a turbo and watch that number increase greatly. Add water-meth injection, that should add another 100 hp and drop egt's by 300-400 degrees.

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[cwc]

red, that looks like a nice book, what's the title?


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[red]

red, that looks like a nice book, what's the title?


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That book is:
Fundamentals of Medium/Heavy Duty Diesel Engines

ISBN: 9781284067057

It's about 1400 pages total. Has a few paragraphs in it that are great when dealing with K&N air filter fanboys hahaha.

 

[stevenbeven]

Thanks Keith for your extremely informative reply. However I had to watch the educational video below to fully understand and comprehend your statements...........

https://www.youtube.com/watch?v=MXW0bx_Ooq4

Freaking hilarious. I’ve watched this video a couple times now!


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