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Date: Sun, 16 Jan 2005 23:00:16 +0000
From: Colin Stamp <colinnospamp.plus.com>
Subject: Re: Opened DI Casette - For those interested


On Sun, 16 Jan 2005 14:19:45 -0500, "Tex" <texnospamm101.org> wrote: >"Retro-Bob" <uctraingSPAM-ME-NEVERnospamanet.com> wrote in message >> I think the overall issue is that you can't put electronic components >> into the top of a cyl head, heat them up to a couple hundred degrees >> day after day, bounce them around on the road, and don't provide any >> cooling via fans, fins, or heat sinks - and expect them to last. >> You've built a system with parts that *will* knowingly degrade and >> fail. Of course, you may not care when you sell them at $75-$100 each. > >Agreed...but is there a way the engineers could have designed the placement >any better? That is, is there no other _feasible_ spot where this module >could be mounted, where it would be subject to less intense heat and other >harsh enviromental conditions? > >How does Nissan mount these? AFAIK, Nissans apparently are not known to >have DI issues. > The coils have to go in the head if you want to get rid of one of the biggest reliability issues on a conventional setup - HT leads. The story for the electronics is a bit more complicated. The last Nissan I owned had only the coils in the head. The drivers were mounted on an inner wing. They could do that because they didn't try to do any fancy stuff using the spark plugs as sensors. At least they didn't at the time - I think it was a 1993 car. Saab on the other hand, do use the spark plugs as sensors, so even if the driver electronics are remote, the sensor electronics need to connect to the HT side of the coils, so have to be in the head along with the coils. IMHO, the system has achieved it's main aim - to reduce the number of failures which leave you stranded at the side of the road. HT leads always were a real headache. The problem is that when it does break, instead of 10 quids worth of leads, you have to shell out hundreds for a new module. Cheers, Colin.

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