Hi Jethro
If you are looking to run Bonneville, I think you should have your engine as good as it can be.
If you buy another used engine you are going to have 150,000 miles of ring wear to overcome.
If you rebuild you can optimize compression and other factors for optimum high rpm running.
The way I understand things is that the main enemy of high rpm power in a diesel is the high compression causing lots of resistance to speeding the engine up. They put cams in that work good at low rpm as well.
We went out past Bonneville in 2005 stopping at the salt flats on our way to record winning human powered run at Battle Mountain NV. Since then we saw the Burt Monro movie and want to return to the salt flats with motor power. We have a plan for 2013 but have to find a way to fund it.
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