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| Common Rail A Fiat Invention? http://www.lostjeeps.com/forum/phpBB3/viewtopic.php?f=5&t=32225 |
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| Author: | yakers [ Mon May 05, 2008 8:06 pm ] |
| Post subject: | Common Rail A Fiat Invention? |
I was reading "The economist" magazine and it mentioned that Fiat developed the common rail injector and licensed it to Bosh. They did not actually say who invented it but if Bosh pays to license a technology it seems like they would go to the original source. I found this interesting as it may be a good indicator of why the KJ CRD has an Italian engine. I tried looking up patents for common rail designs but got mostly recent Japanese designs. Anyone know the origin of the common rail design? Someone had to be fist and it must have been a big design jump from standard injection pumps. |
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| Author: | DarbyWalters [ Mon May 05, 2008 9:34 pm ] |
| Post subject: | |
Alfa had the first passenger car with it...FIAT...1997 |
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| Author: | nursecosmo [ Mon May 05, 2008 11:15 pm ] |
| Post subject: | |
It first appeared on test engines in the 60s but Denso was the first to it in production vehicles in 1995. http://en.wikipedia.org/wiki/Common_rail |
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| Author: | warp2diesel [ Mon May 05, 2008 11:30 pm ] |
| Post subject: | Common rail was a dream long ago.... |
... and when technology evolved it became reality. When I built my working mechanical variable stroke injection pump (yep the engine ran) for an independent study back in the 70's I had sketches that were my dreams of what later became the electronic common rail injection. Technology did not exist to make it happen, so it never made it off the sketch pad. I had that dream and so did others who had the resources to make it happen. Fiat just happened to make the move and put up the money. Fiat was in a position to produce cars but not produce and mass market common rail injection systems,. Bosch and others are, so Fiat made a smart move and worked out a deal and their deal was cheaper than designing around the Patent and fighting it out with Lawyers. Every one came out a winner and our CRDs are the second generation of the common rail injection. |
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| Author: | dkenny [ Thu May 08, 2008 12:48 pm ] |
| Post subject: | common rail.. |
my 84 Detroit diesel 8.2L turbo has common rail and no injector pump..so it was around before the 90's. |
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| Author: | nursecosmo [ Thu May 08, 2008 2:36 pm ] |
| Post subject: | Re: common rail.. |
dkenny wrote: my 84 Detroit diesel 8.2L turbo has common rail and no injector pump..so it was around before the 90's.
The term common rail here is really referring to high pressure common rail and not unit injection which uses a low pressure fuel pump and mechanically activated injector units which run off of a dedicated cam shaft, or HEUI injection which uses a combination of a low pressure fuel pump and high pressure oil pump for injector activation. Although both of these systems use a so called common rail for fuel supply, the rail is really cast into the head and are technically called fuel galleys. The true common rail fuel system uses a single high pressure fuel pump and a fuel rail external to the block and head which supplies each injector at constant full injection pressure and did not appear in production highway vehicle use until the 90's. |
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