Category: Maintenance Log

In talking with a few buddies, it seems that a late 80’s early 90’s Toyota Celica fuel pump will work for the pump. Haven’t found how much amperage it consumes yet. Hopefully it’s below 10 amps. Also a Dodge Neon throttle body is about 50mm which would be perfect for a single throttle body setup. Both these parts are dirt cheap online.

Another buddy said that he could probably get me in for some machine time to build some injector manifolds and the connecting plates for the throttle body (air cleaner and to split it to the two heads). That just about solves the two hardest parts of this project!

One of my buddies (Derek) also said I could borrow his MegaSquirt simulator board when it comes time to build my own MegaSquirt. I’m still debating if I’ll go with the MSI or MSII. There are benefits to both. I might go with the MSI because it’s cheaper.

For injectors, I’m thinking some sort of saturated injector because it is relatively low amperage (1.5 amps). However peak/hold injectors are a little more readily available… Also I’m having difficulty finding info on injector bung sizing.

PC800 re-measured: 36mm inner, 42mm outer.

V-Strom 1000: 45 mm throttle bodies

V-Strom 650: 39 mm throttle bodies (or are they 42mm TB’s? seems they are 39mm…)

Moto Guzzi Breva: 37 mm?

Kawasaki Vulcan VN1700: 42 mm? (note that this looks really nice because the connection between the engine and the throttle bodies can be removed and replaced with something different that I machine myself. downside is it’s fairly rare.)

Honda VT-1300: 38 mm (only one on the bike!?)

Honda VT-750 Phantom: 32mm (only one on the bike?!)

CAN AM 800 (2009 model) ATV with some sort of throttle body that might work…

Sportsman Polaris 800 or 850

Dodge Neon has a 50 mm TB.

Fuel Pump stuff:

Seems like just about any 80s Toyota or BMW fuel pump will work because they’re all external pumps. Like a Toyota Celica pump. You can get them on EBay for 45 bucks in the right flow rate.

Note: Derek Duncan has a MegaSquirt simulator I can borrow.

Need to find a proper tilt sensor for motorcycle fuel injection pumps.  Might be able to scavenge one off of a motorcycle harness.

Will have to decide between modifying the fuel tank to accept an internal pump or having an external pump after the existing pump (low pressure then high pressure pump) with a surge tank.  Also should put in an accumulator or something similar which can be done with a T off the fuel line past the high pressure pump and some rubber hose.

Looks like the V-Strom 650 throttle bodies have dual butterfly valves.

how to do IAC valve control with an MS-I http://www.msextra.com/doc/ms1extra/MS_Extra_Hardware_Manual.htm#Fidle

The spare set of carbs from Phil came in the mail yesterday.  They are making my lab smell pleasantly of gasoline and solvent.  One of my labmates is also a gearhead.  He’s loving it.  The others aren’t saying anything yet.  I guess that gas smell hasn’t traveled all the way down the lab.

Taking some measurements from the carbs, I found the following:

Throttle body outlet measurements:

• Outer diameter: 40mm
• Inner diameter: 37mm

Throttle body inlet measurements:

• all wonky because they are tapered to receive the plastic airbox

I’ve been poking around looking for 37mm inner diameter throttle bodies with sensors and fuel injectors already installed but have come up short.  It seems like the Moto Guzzi Breva 750 throttle bodies might be the right size.  There is an auction on ebay for a set.  They have a sensor but don’t have any injectors as far as I can tell.  There is also a Suzuki Burgman 400 throttle body that ebay indicates might be the right size.  Looking at the microfiche, the Burgman does have fuel injectors.  I wonder if anyone on the IPCRC might have an extra set laying around…  The microfiche doesn’t tell me enough to figure out what angle the injector body is at compared to the throttle body and if the throttle body has any strange turns like the fuel injected VT750 throttle bodies do.

My google-fu is obviously weak because I haven’t had any luck finding a list of throttle bodies for common vehicles and their dimensions.  Does anyone know where I might be able to find such a list?