Hirth EFI unit on a Rotax 582?

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Posted

Man I would love to try one of these on my Rotax 582. Has anyone ever played with EFI on the 582?

 

EC83A6AF-071B-4158-83C3-7BAB8ADA77A7.jpeg

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Posted

Funny enough I was talking to a mate today about wanting to do the exact same thing..... neither of us have any idea if it has been or if it can be done....

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Posted

Wonder if that is a mechanical fuel injection?   Kinda like my subaru which it is basically like a garden hose sprayer nozzle:  as you push the throttle body plate open it also opens the fuel sprayer nozzle.

That as opposed to a digital efi where it controls injectors via a computer,  automatically adjusting for engine temp, air temp, and pressure alt, ect.

The mechanical FI doesn't seem like too much of an advantage over carbs... except that you can incorporate a lean/rich mixture lever in there where it offsets the fuel nozzle position with respect to the throttle body as they move together.

I really dont know much about it.  Hopefully someone here who has tried it might chime in.  But seems like tuning for all the carb ranges might be difficult (rich at a certain rpm, lean at another..)  maybe more workable on a 4 stroke where a little lean here or there isn't as big of a deal.

 

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Posted

Mechanical fuel injection also has no Venturi, so therefore no possibility of ice.

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Posted

Man I would love to try one of these on my Rotax 582. Has anyone ever played with EFI on the 582?

 

EC83A6AF-071B-4158-83C3-7BAB8ADA77A7.jpeg

Skidoo/Rotax actually made a 580 EFI in 1993 only. Then didn't use it again till they switched over to their New Engine Line after 2000. EFI Stands for Electronic Fuel Injection. There is No Manual Fuel Injection made for these 2 Strokes used on Planes that I know of, but one could be maybe made. I would look at the Old Crower Fuel Injection for Racing. What would be nice is to see what Size Throttle Bodies they used on this Hirth EFI! Almost All Rotax Engines used 36mm Bing 54 Carbs 277UL, 377UL, 447UL, 503UL, 532UL, 582UL, 618UL. There is a Company called Ecotrons, https://www.ecotrons.com/small_engine_fuel_injection_kit/400cc_to_800cc_engine_fuel_injection_kit/   who is making EFI kits for different Engines. READ all the INFO on their Site, then READ all the Info on Mega Squirts web site. You also have the MegaSquirt EFI System http://megasquirt.info/products/diy-kits/ms3/   which is Cheap and has DIY KIts, and Tuning Software is Free http://www.tunerstudio.com/index.php/tuner-studio that  allows you to use a Laptop. LOOK at the Photo's and READ the Info. There is Fuel Injector Calc https://www.witchhunter.com/injectorcalc1.php   to figure what Size Injectors you need. Many different Engines come today with EFI, Sleds, ATV, Bikes, etc., that you might be able to use the Parts to make one for your Engine of Choice.

Like here a EFI 45mm off a 650 Polaris. $40 off eBay. Break it up to make (3) Singles, or (1) Twin and (1) Single. A Seadoo 800 EFI Rotary Valve Intake. Adapter Plate for an SFS Throttle Body.

1993-1997 Polaris RXL 650 throttle bodies ITB 45mm - 1.jpg

SEA DOO GTX 800 787 RFI EFI Intake 2.jpg

Old Skidoo Rorax Single SFS Adapter 2.jpg

503 Rotax 40mm SFS Adapter 1.jpg

SFS Single Throttle Body.jpg

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