How big is a cylinder on a Cummins ISM?

"Full of the sound of the Gran Fury, signifying nothing." (granfury)
07/10/2019 at 12:11 • Filed to: None

Well, I don’t know if this from a ISM or one of the other engines in the bigger bu ses. And no, that’s not one of those little 3" disc s...

Looks similar to a KTM690

Kinja'd!!!

Quarter for scale

**edit**

Looks like the truck about 3/4" larger diameter

MonkeePuzzle > Full of the sound of the Gran Fury, signifying nothing.
07/10/2019 at 12:25

is that an MP3 in there? wat is that thing?

jimz > Full of the sound of the Gran Fury, signifying nothing.
07/10/2019 at 12:27

M-series has a 125mm bore, so that would check out.

Kinja'd!!!

not even their biggest engine, the X12 and X15 sit above it.

edit: and color me surprised it still uses a graphite composite gasket. I’d have thought everyone was using multi-layer steel by this point.

MultiplaOrgasms > Full of the sound of the Gran Fury, signifying nothing.
07/10/2019 at 12:27

Quick wikiing says the ISM has a 4.921 in bore , while the CD diameter is 4.7 i n.

X15's is quite bigly too, I’m looking at its CAD right now.

benn454 > MonkeePuzzle
07/10/2019 at 12:56

It's one of those shiny drink coasters, duh.

MonkeePuzzle > benn454
07/10/2019 at 13:03

huh, I did some googling which suggested it was somethign called a “record”

punkgoose17 > jimz
07/10/2019 at 13:44

The ISM is ancient. They won’t change the gasket if it has no issues. I am sure the tooling is all paid for.

benn454 > MonkeePuzzle
07/10/2019 at 13:44

You sure you're not talking about those weird plastic flutes we had to "play" in middle school?

just-a-scratch > jimz
07/10/2019 at 13:50

If you remove the limitation of on-highway engines, they make much bigger models too.