The Green block 92's were designated OO, those were nothing more than a 8V-71 block machined for
92 liners, using 71 crank and rods. Had a real problem breaking main caps and some cranks.
A model cat arrived in early/mid 70's, Big Cam Cummins arrived in 1976. Because of the issues with
the OO, Detroit came out with a 200,000 mile warranty but the damage was done.
If not for the Penske involvement Detroit was headed down the drain. Penske's Series 50, & 60 was
the beginning of the true Tier 2 engine. It was damn near bullet proof compared to anything else.
The designers of the Series engines knew 2 stroke power was a dead end, the way out was a
revolutionary 4 stroke. In reality had it not been for the mistakes made with the 92, Detroit probably
wouldn't be where it's at today with better than 1/3 of the on highway truck engine market.
Years ago I worked with one of the best 2 stroke mechanics, I was lucky in that respect.
Ed worked for Emerson Diesel a Detroit dealer shop in Seattle, and for awhile Emerson shipped him
north to service/repair the power houses along the Alaska pipeline. He had many funny stories.
He had his way of tuning and obviously it worked well because he was never out of work or someone
hounding him to tune a green engine. Ed would say {if you see a Grayhound or any other Detroit
powered bus that has a clean ass, either it was just washed or the jackass who tuned didn't know
his ass from a hole in the ground, it better have a gray cloud on hard throttle and right now}.
I asked him if he liked Detroit's {it's a pay check only slightly better than pimping}