Do Injecters ever go bad+easiest way to remove - page 3 - IDI Engine - VWDiesel.net The IDI, TDI, and mTDI source.

#30 by guy plain on 24 Jul, 2011 14:56
that there are potential gains available from lower injector pressures, rather than going higher...
please explian....i know im interested...
#31 by Mark(The Miser)UK on 24 Jul, 2011 16:53
Quote from: guy plain on 24 Jul, 2011 14:56
that there are potential gains available from lower injector pressures, rather than going higher...
please explian....i know im interested...

Higher break pressures were in part to help overcome nozzle faults, and part to allow for a quicker engine, ie faster burn of more fuel in conjunction with the additional air of the turbo.

In a swirl chamber, higher injection pressures, giving finer and finer sprays may develop penetration issues when fired across flow of compressed air. Conversely, successful finer sprays can lead to 'better' combustion, ie quicker, but this can lead to higher peak pressures and temperatures and also increased Nox, increased heat loss through chamber.

Lower pressures may give better penetration and perhaps a longer burn due to the larger globules of fuel, giving a longer torque, lower max temps, less heat loss lower Nox, quieter engine. Less power absorbed in injecting, and better fuel economy when cruising.
#32 by guy plain on 24 Jul, 2011 17:21
so better in dayly use...long engine life....so would the higher pressure be better for high perfomance then? on and engine that wasnt ment to have a long life ...just hp?
#33 by Mark(The Miser)UK on 24 Jul, 2011 17:50
Quote from: guy plain on 24 Jul, 2011 17:21
so better in dayly use...long engine life....so would the higher pressure be better for high perfomance then? on and engine that wasnt ment to have a long life ...just hp?

Probably yes on average, however, engines are funny things and some take a lot of 'abuse' and don't wear at the same rate as others. Some are born to be trouble. I call it the Tom, Dick and Harry syndrome, but if I use the film Christine to simplify; some engines are born to be bad. Clean burning of fuel and general engine care helps all engines though.
So many engines get killed off because of poor bodies. At least with these old diesels there is a chance of rebirth as a generator.
#34 by guy plain on 24 Jul, 2011 18:53
lol i grew up with detroit deisels....2 strokes....these 1.6 td,s are way different.....but i have 4 of them now...i do want to try one in a boat....i think the power/wieght is just about right for a small speed/cruiser