I cannot remember, but it is less than that of the 5.9 isb's

 

I believe it's 23 quarts. I'll check my manual when I get home.

 

5.9----28 quarts
6.7----22.6 quarts

 

REALY. . .I figured the 6.7 would hold more. . .well then, guess you can chalk it up to radiator effeciency

 

It might be a factor of less coolant capacity in the actual engine block( if the blocks are similar then the cylinder space had to come from somewhere), and plus a turbo doesn't add much more coolant to the system really, maybe another quart or so... obviously depending on the size...

 

the actual block is a bit larger to handle the increased size of the holes. . .I guess the coolant loss may come from where the cylinders are siameased 1-2, 3-4, 5-6.

 

Or possibly the charge air cooler is bigger and takes some of the radiator space up??

 

In this application what does Siamesed mean. The old chrysler wedge motors were siamesed on the middle exhaust ports, are the pairs of cylinders joined by webbing for strength?

 

What I believe Drew means is something that is done on quite a few inline engines for space saving and rigidity of the cylinders(I know it was done on Datsun 280ZX...). What they do is put the cylinders a little closer together (or not, depending on application), and not have a coolant passage between them (or at least not the full length of the cylinder), so the 1-2 siamese looks like an "8" where non-siamesed are "o o" with space. If that makes sense...

I have heard that siamesed engines typically have problems with cooling... I hope that doesn't become a problem on the 6.7L when adding power...

 

the 8 cooling is reasonable. Maximizes cooling without lacking structure. this is the "webbing" i was talking about. More potential is my guess given heat exchange would be comparable.