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#16
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Megasquirt is a computer system, not an injection system.
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#17
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As Forced said it is a computer not an injection system so there is no such thing as megasquirt injectors, etc. Still, megasquirt is designed for gas engines, which do not need precise timing on injection events. You just spray a bunch of gas into the intake (or in front of each valve if you want) and you're good to go. A diesel wouldn't run too well that way.
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John Robbins '05 E320 CDI - 240k '87 300TD - 318k |
#18
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I don't mean to rain on your parade, but the cost makes it very hard to justify. IMO, the best way to have a computer controlled IDI diesel is to use the injection pump off of an OM606 (won't work on OM616 or OM617 diesels though). It has an electronic fuel rack... that way you can control the amount of fuel, without having to worry about all the injection timing events, and gobs of custom fabrication.
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John Robbins '05 E320 CDI - 240k '87 300TD - 318k |
#19
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I think so. The problem with converting to DI is there is a different piston and head design. After replacing those it might very well have been cheaper to put in a used DI engine!
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John Robbins '05 E320 CDI - 240k '87 300TD - 318k |
#20
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another obstacle is compression ratio on these cars. DI ratio's are around 14:1, where our IDI CR is around 22:1. so is this plan to just computerize the existing IDI injectors, or to upgrade to DI injection? cause I don't see computerizing IDI as much of an improvement. and I don't see DI working at 22:1 CR... so you are talking about not just redesigning the injectors, you are talking about redesigning the piston and head dome... um. not really possible, but if you think STOCK 616/617 pistons are pricey... try one off pistons...
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#21
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Well, this is good information.
Not what I was hoping to hear but good information. I am interested in Gurkha weighing in with the Indian connection to advances relative to the 616 617. Tom W
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#22
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On the Mercedes side of things...
The OM 602.98x was Mercedes' direct injection version of the OM602.9x. Introduced in the 1996 E290, Sprinter and Unimog it used a rotary injection pump and an intercooler. Power was mostly the same. |
#23
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The reason for the slightly lower compression ratio is the increased turbo boost. The newer engines run much higher boost, hence the reason for slightly lower CR. For the same reason, a normally aspirated diesel motor will have a CR that is higher still.
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'98 E300 turbodiesel |
#24
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Looks like a less complicated swap. Good luck trying to get one in this country, you would have to import it.
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1999 SL500 1969 280SE 2023 Ram 1500 2007 Tiara 3200 |
#25
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if the CR is different only for added turbo boost, then it's the boost that gives the additional power, not the DI/IDI thing... so... if we put a thicker head gasket on our 617's added a bigger turbo for more boost, and enriched the fuel... would we get a big boost in power without the danger of high EGT? ... HMMMMM
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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#26
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No, you would have lower power and reduced efficiency because of the reduced squish area between the head and piston. If you want to lower the compression ratio you would have to machine out the bowl of the piston.
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#27
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Converting to direct injection would involve a new head and pistons at a minimum.
However, convering the existing indirect system to common rail injection seems a lot less involved. Need feed pump, sensors, switchable injectors, computer controller and common rail (manifold). Is this more what you had in mind Tom? Also, any possibility the existing IP could be used as a feed pump -- disconnect throttle & ALDA and wedge in WOT? That would make playing around with the idea a lot less involved and potentially easily reversible, provided you din't blow up the engine
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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png Broadband: more lies faster. |
#28
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What would be the advantage to converting to common rail?
Want more power? Turn up the pump and/or install larger plungers. Want better atomization? Shim the injectors to a higher pop pressure (Like mine). Want a different spray pattern? Install different nozzles (Like mine). Want multiple injections (pre-spray) from the injectors? Use 2-stage injectors (Like mine). There wouldn't be any advantage to building a common-rail system to fit an old inefficient engine like the 617. In the end, it would still be far cheaper to buy a wrecked sprinter and transplant the drivetrain. |
#29
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Yes, I was thinking of using the existing heads and pistons and just contolling the injection process better. I am not kowledgable about the idi di question.
Tom W
__________________
[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC] ..I also have a 427 Cobra replica with an aluminum chassis. |
#30
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I'd think piston head changes and changing the distance between the head and block would be equivalant compressionwise. I find these littel nuances facinating, so if you have any pointers to further reading I can do to educate myself on why not, I'd really appreciate it.
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'83 300DTurbo http://badges.fuelly.com/images/smallsig-us/318559.png Broadband: more lies faster. |
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