18-04-2018, 12:10 PM
Like Wainwright, I'm far from an expert on diesels, but based on everything you've said you've checked, I'm going to throw out a some more ideas:
Injection timing
Valve timing
Compression (I'm guessing it's not this as you said you ran it without boost & still had the problem. Do you know what the compression gets to?)
I don't know to what extent you built the engine based on tried & tested combinations of components or whether you've experimented a bit? Rather than scrap it would you not consider some input from a professional engine builder? I know it's going to cost you yet more money and the idea would have been to complete this project on your own but ........surely, giving up is not an option. It's not admitting defeat to get someone else to look at it.
What has the process been to map it btw?
Just another thought! Have you tried running it without a thermostat in the cooling system? Also, I am I right in thinking you upgraded the water pump? Any chance one of the coolant hoses is collapsing at higher RPM?
Injection timing
Valve timing
Compression (I'm guessing it's not this as you said you ran it without boost & still had the problem. Do you know what the compression gets to?)
I don't know to what extent you built the engine based on tried & tested combinations of components or whether you've experimented a bit? Rather than scrap it would you not consider some input from a professional engine builder? I know it's going to cost you yet more money and the idea would have been to complete this project on your own but ........surely, giving up is not an option. It's not admitting defeat to get someone else to look at it.
What has the process been to map it btw?
Just another thought! Have you tried running it without a thermostat in the cooling system? Also, I am I right in thinking you upgraded the water pump? Any chance one of the coolant hoses is collapsing at higher RPM?