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Mercedes K-Jetronic on a twin-turbo engine

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Old Jun 28, 2009 | 04:40 PM
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Default Mercedes K-Jetronic on a twin-turbo engine

I hope this is the place to ask this, as I've been doing some research for quite some time on CIS systems, and I'm thinking using one on a project that I'm working on. This project is not your run of the mill engine, and the reason why I'm going with a K-Jetronic style injection system is for the vintage look. Sure, I could go with a Megasquirt or adapt Ford/GM EFI to my engine, but that defeats the purpose I'm aiming for. I like the idea of the constant flow injection, as I don't have to worry about timing issues with the injectors, since the engine I'm using has an odd firing order. What engine you ask? Well, it's a Packard 327 cid straight eight. Now that I've let that out, does anyone have any tips and pointers for me to save a lot of time and money? The main reason for going to fuel injection is the turbos, and I don't really want to do a draw through carb setup. I'm thinking of a 450 SEL 6.9L since I'm pretty sure it'll flow enough fuel. I'm also planning on using E85, hence the need for more fuel flow. Here's some pics of what I'm working on, and where I am so far:









And what it'll look like when it's done, sort of:




I say sort of since it won't have any fenders and the grille will be leaned back quite a bit. (the grille shell and headlights I have on there now won't be the ones I'll be using.) So, can anyone give me some pointers on CIS fuel injection and turbos? I'd hate to have to use the 4 SU's that I originally planned on using!

{Edited to reduce the size of the pics}
 

Last edited by Turbopackman; Jun 30, 2009 at 09:03 AM.
Old Jun 28, 2009 | 10:40 PM
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Yup, I got tired of seeing your typical small block Chevy in every old car at a car show, so I figured I'd be a "little different". I've been messing with straight eight and V8 Packards for almost 15 years now, and I've decided to go all out on this one. I like the idea of the K-Jetronic, as it's simple as can be, which is perfect for this project. That, and the fact that it looks almost like one of the systems that Packard was experimenting with in the '50s makes it a no brainer for me.
 
Old Jun 29, 2009 | 04:07 PM
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Well I found a nice Mercedes 560 fuel distributor and air flow meter, but I'm wondering if you can blow through the air meter, as opposed to drawing through it. It would make my installation a LOT easier if you can without too much trouble, but I've been reading about the air flow meter not taking too kindly to sudden changes in air flow, but I really don't see how it would make much difference either way. Any tips?
 
Old Jun 29, 2009 | 06:58 PM
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That's what has me thinking. Would it be simpler to draw through it, or to blow through it. Mounting wise, it's MUCH simpler for me to mount it on the custom airbox I'm building and blow through it. The reason being, my pair of turbos are mounted on top of the engine, about 10" above the head. The air box will be sticking about 10" straight out the passenger side of the block, and the perfect place for it is sticking on top of this air box between the headers that mount the turbos. Confused? I am! LOL!
 
Old Aug 20, 2009 | 01:35 PM
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I've acquired a 1986 560 SEL CIS unit with all 9 injectors and plan on using the 9th injector as a boost operated enrichment injector coming on at around 8-10 psi. Since having the unit in my hands and seeing how it works, I've decided to mount my two turbos low on the passenger side of the engine, and have the intakes of the turbos facing each other, and connected to each other with the throttle body mounted above them between the turbos and the CIS unit. This way, it'll operate essentially the same as it did when it was in the stock Mercedes. I don't have the WUR, and am wondering if I really need it or if I should buy a boost referenced one. Anyway, here's a few pics:










 
Old Oct 23, 2009 | 03:27 PM
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New update, I ended up finding a "new" engine, a '47 Packard 356. I also decided on going with fenders since I kept having nightmares of rocks and mud being kicked up by the tires and into my face. I also found a hood for it, and decided to use my '25 grille and headlights on it. Here's a pic of it as it looks now.





Now for my main question, does anyone know what the cfm is on my 560 SEL air flow meter is? I can't seem to find any info on it anywhere.
 
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