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Topic: just thinking... (Read 711 times) previous topic - next topic

just thinking...

Most people say you should run low compression on a turbo engine, but low compression makes for an inefficient engine, thus eliminating some of the benefit of a turbocharged small displacement engine. Ford's new Ecoboost engines run much higher compression ratios, and I am guessing that this is to increase the efficiency.

So, would it not be smart to boost compression, say to 9.5:1, then counter with a slightly bigger cam, thus reducing cylinder pressures likely to lead to detonation? Coupled with the stock IHI turbo on an '87-'88 set to 15 or 18 psi, this should increase power and economy. A bigger intercooler or methanol injection might be needed under full boost to counter boost induced detonation I would think, but I cannot think of any other reason as to why you wouldn't want to build an engine like this.

No, it would not be the best all-out power engine, but for a street driven vehicle, can anyone tell me why I am wrong in my assumptions?

Shiny Side Up!
Bill
"as if 'religion' were something God invented, and not His statement to us of certain quite unalterable facts about His own nature." -C.S. Lewis
 

just thinking...

Reply #1 –
The new EcoBoost is also Direct Injection which makes it possible for higher compression IIRC. Supercharged motors tend to do alright with higher compression as far as I have been told but I'm no expert.