Idit piston rings

[frankenwrench]

I read through a large amount of the tech article and found part numbers for the na rings but didn't find a part number for the std idit piston rings. Any clues?

 

[Philip1]

As far as I'm aware the piston rings are the same between the idi and idit. Someone with more knowledge than myself might correct me but I'm pretty sure only the wrist pin (and related parts) are different

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[u2slow]

The factory IDIT uses keystone shaped rings. They are self-cleaning, and seal better to deal with the higher cylinder pressures of turbocharging. You find this design in most industrial diesel engines.

 

[Garbage_Mechan]

The 6.9 / 7.3 all use keystone rings as I recall.

 

[aggiediesel01]

The 6.9 / 7.3 all use keystone rings as I recall.

You may be correct and I don't know otherwise but the "coffee table book" for the IDIT touts the keystone rings for their qualities as noted above.

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[Thewespaul]

The na IDI rings are not keystone like the idit rings, here’s some specs on the various IDI rings.
IDIT rings top to bottom:
1/8” 6* keystone
5/64” 3* keystone
9/64 oil control ring

1994-1989 na 7.3:
1/8” conventional
5/64” conventional
9/64” oil control

The 88 7.3 is 5/64, 5/64, 9/64 and the 6.9 is even smaller at 5/64, 5/64 and 7/64.

 

[Garbage_Mechan]

Thanks for clearing that up Wes. I looked at some pistons this morning before I found your posts. I guess I’m just used to diesels having keystone rings. The first diesel I ever rebuilt, a Waukesha 190 DLC had them. But the 6.9 piston I have on my bench doesn’t. Guess I shouldn’t post from the campfire lol.

 

[Thewespaul]

Wasn’t my intention to “internet correct” anyone haha, just sharing what I’ve found. Really any diesel should have keystone rings, just another reason to build an idit over the older idis.

 

[aggiediesel01]

IDIT rings top to bottom:
1/8” 6* keystone
5/64” 3* keystone
9/64 oil control ring

Any idea why your measurements and the book are different? Early vs late, preproduction vs actual, typos from engineering?

 

[Thewespaul]

It’s possible that is the degree of the keystone in the ring land not the actual ring that they are referring

 

[Garbage_Mechan]

Wasn’t my intention to “internet correct” anyone haha, just sharing what I’ve found. Really any diesel should have keystone rings, just another reason to build an idit over the older idis.

No need for you to apologize Wes, I was the the one talking without checking facts first. Glad you are here with fact checked info.

 

[frankenwrench]

Ok so about that part number for the keystone rings? Still having issues finding them

 

[frankenwrench]

Ok if theres no parts for this or anyone that has info, anyone want to buy me out of all my idi stuff?