<p>https://www.dieselpowersource.com/3-...ge-cummins-24v</p><p>Never heard of it before? Keeps them from shrinking/warping?</p><p>Discuss?</p>

 

Why would a cast manifold shrink? I have never heard of that before. Looks like more places for it to leak if you ask me.

 

<p>Apparently its common with the 12/24v cummins trucks.</p>

 

How long is a cummins head compared to a miata, and do they naturally run hotter and higher pressure ratios?

I had a Cousin making manifolds for 12V years ago, he had a hell of a time keeping them from cracking all the time.

 

<p>Gas runs much hotter EGTs.</p>

 

Inline 6 diesels commonly have 3 piece exhaust manifolds because they are long and there are differing rates of expansion. Some have individual heads for each cylinder even though the block is one piece.

 

<p>Good to know.</p>