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Forum: Diesels

11-03-2009, 06:09 PM

Replies: 38

The reason diesels are efficent at idle? Solved!

Views: 17,651

Posted By GasSavers_bobski

Right... I'm saying your conclusion about later...

Right... I'm saying your conclusion about later exhaust valve openings increasing the throttle-modulated engine braking effect is backwards. I guess I could have cropped the quote a little better.

Forum: Diesels

11-02-2009, 03:22 PM

Replies: 38

The reason diesels are efficent at idle? Solved!

Views: 17,651

Posted By GasSavers_bobski

I think you've got that backwards. When the...

I think you've got that backwards. When the exhaust valve opens, pressure in the combustion chamber drops, so the force pressing against the piston disappears; The energy stored as compressed air is...

Forum: Diesels

11-01-2009, 01:23 PM

Replies: 38

The reason diesels are efficent at idle? Solved!

Views: 17,651

Posted By GasSavers_bobski

Sort of. You get the similar benefit of being...

Sort of. You get the similar benefit of being able to ignore the air charge that isn't needed, but direct injection doesn't rely on autoignition - it still uses a spark plug. In that respect, I think...

Forum: Diesels

10-18-2007, 08:26 AM

Replies: 38

The reason diesels are efficent at idle? Solved!

Views: 17,651

Posted By GasSavers_bobski

While you have the right idea, it has very little...

While you have the right idea, it has very little to do with the number of cams the engine has. DOHC designs simply make it easier to run 16 (or 20 in some Toyota designs) valves and place the spark...

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