Date: Tue, 18 Jan 2005 20:05:19 +0000 From: Colin Stamp <colinnospamp.plus.com> Subject: Re: Opened DI Casette - For those interested
On 18 Jan 2005 18:37:01 GMT, Dave Hinz <DaveHinznospamcop.net> wrote: >On Tue, 18 Jan 2005 18:08:39 +0000, Colin Stamp <colinnospamp.plus.com> wrote: >> >> Like I said, DI tries to trade off the number of breakdowns against >> the cost of each one. Maybe not everyones idea of the best compromise, >> but that's what they went for. > >Well, DI is a lot more complicated than just a replacement for points, >condensor, rotor, coil, cap, and wires. It's an integral part of the >engine instrumentation and management system. The spark plugs are used >as combustion chamber sensors to determine the impedance of the fuel:air >mixture, to decide (among other things) optimal boost and spark timing >on a per-cylinder basis. These things just aren't possible with >a distributor, cap, and rotor type system. > >> You'll get a very jaundiced view of DI >> by reading newsgroups like this one. People won't post about it unless >> it breaks. >> >> I'm sure there are other benefits too. Cost maybe? > >I doubt it's cheaper than old-style ignitions systems, but emissions >and performance can be attained with DI that aren't possible without >it. I wouldn't say it's impossible to get the same level of control without the DI , but the Saab setup does do the job neatly and I suspect more cheaply than using extra sensors. Cheers, Colin. > >Dave Hinz
 |
 |
 |
 |
 |
