MS'ing 45 degree V-Twin

Dr.Hess · Post by **Dr.Hess** » Mon Dec 11, 2006 7:00 am

I bought the whole set from a 02 Buell X1, I think. Its in a box on my shelf. I'll try to dig up a pic at home. Don't know how much it draws, as, it's in a box on my shelf. The Sporty is next up for a squirt, but I'm still waiting for the uS to come out and for someone to figure out the odd fire on it. How's that going?

Skiericski · Post by **Skiericski** » Mon Dec 11, 2006 7:38 am

Both the pumps on eBay say they're for '03 and newer, so I guess they switched to internal in '03? Good to know.

Dr.Hess · Post by **Dr.Hess** » Mon Dec 11, 2006 7:11 pm

OK, attached is a pic of the stuff I bought from an 02 Buell X1. Fuel pump is over on the left. As a size reference, that's probably about a 3/8" hose/barb and that bore is probalby close to 40mm. Anyway, I think it will fit in the space under the seat between the battery and the cover thingie, along with a uS and maybe a relay.

newtyres1 · Post by **newtyres1** » Mon Dec 11, 2006 10:52 pm

Just for info, all the "XB" models have internal fuel pumps (bolt in from the outside with a flange), I think they first came out around 2003 and are still in production. So any Buell that isn't an "XB" and has fuel injection (some had carby's) should have the external pump. I think some of these models were X1, S1, and S3. It would be interesting to ring up a Harley/Buell dealer and see what they're worth new.

Ian.

FIntruder · Post by **FIntruder** » Wed Dec 13, 2006 4:51 pm

The pump in the picture has a sock filter which means its gonna need to have that end immersed in fuel. I can't tell if the whole thing gets put into a tank or if there is a flange and o-ring missing so that it can stick into the tank and have the hose pipe on the outside to connect to the fuel line to the TB. That is the same TB I have.
I had kinda hoped that the ends on that style of pump could be modified so as to accept a fuel line on the intake side instead of having the sock surround it. Most don't, just open on the end. An inline fuel filter just before the intake side would do the same job as the sock. Oh well, back to messin' with the resistor and my MSD2225.

newtyres1 · Post by **newtyres1** » Thu Dec 14, 2006 12:50 am

How are you going with that series resistor, any good news?

FIntruder · Post by **FIntruder** » Thu Dec 14, 2006 5:22 pm

It'll be awhile before I start experimenting with the resistor and the MSD pump. I'll keep ya posted.

kib_norway · Post by **kib_norway** » Tue Dec 26, 2006 6:29 pm

FIntruder wrote:It'll be awhile before I start experimenting with the resistor and the MSD pump. I'll keep ya posted.

How about making a regulator/speed controller circuit that measures the pressure out of the pump, and then regulate the pump motor to keep 3 bar or whatever pressure one need on the fuel rail/injectors?

Would require a pressure sensor in the fuel line between the pump and the injectors... but might solve a few problems related to 'squirt convert a carb Harley:

1. This would makeit possible to use whatever inline pump available
2. The current draw to the pump will be minimized to just exactly what the pump needs to generate the pressure needed
3. This could eliminate the need for a mechanical fuel pressure regulator
4. This could eliminate the need for a return line from the regulator.

These may just be a crazy idea.... anyone have experience with a setup like this? Have anyone a cuicuit layout available, and what pressure sensor to use? Any input welcome.

FIntruder · Post by **FIntruder** » Thu Dec 28, 2006 2:05 pm

So basically an automated potentiometer that varies the speed of the pump so that it provides the pressure that the system needs? That would be great, send me a schematic and a parts list and I'll get started.

That does sound like a great idea for any FI system but I don't know what it would take to build something like that.
Another problem is I think it would probably surge too much as it constantly adjusted to keep the pressure at the designated setting. I wonder if any high-end cars like F1 or something uses a system like that. All I have ever seen is the "bleed off the extra" regulator style, they seem to be the standard and everything is made to work in a system like that.
I guess I'm just gonna have to give it a try and see for myself like I had to with my 1 OHM speakers years ago that no one said would work. Sorry for the sarcasm, its a gift that I sometimes share with my closest friends.

newtyres1 · Post by **newtyres1** » Thu Dec 28, 2006 3:57 pm

This might be what you're looking for, a PWM motor speed controller. Price is in Australian dollars. This should work a lot better (or more efficiently at least) than a resistor. Don't be put off by the nitrous fuel controller label, read further. "Fuel pump up to 10A" is the interesting bit.

http://www.jaycar.com.au/productView.asp?ID=KC5382
&CATID=&keywords=nitrous+fuel+controller&SPECIAL=&form=KEYWORD&
ProdCodeOnly=&Keyword1=&Keyword2
=&pageNumber=&priceMin=&priceMax=&SUBCATID=

Ian.

MicroSquirt.com read only forum (Jan.15,2018)

MS'ing 45 degree V-Twin

Resistor or speed controller?