Posted by David g on February 02, 2020 at 08:56:31 from (209.181.208.169):
Nice to have fellow Clark people here, they were a beast, but hard to get online.
Here is my opinion, please join in.
They were a 2 stroke that was prone to detonation due to over rich mixture if boost was not kept up. The tubochargers were massive, and required a lot of energy to spin and heat. Heat is required to make a turbo work. There was no heat during starting and the cold massive turbo would suck it all up. The ones I worked on had compressed air sprayed on the turbo to get it spinning. We had a finite supply of compressed air, so the engine must produce enough energy to take over on the turbo before the air ran out. The quickest way to do this was retard the timing, I think like 24 degrees ATDC. This produces a ton of heat in the exhaust but totally cuts the torque the engine can produce. Once the engine was online the HP would keep the turbo hot. It was a balancing act to advance the timing and load the engine at the same time so it could run on its own.
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