Fuel injection v Carb ?$?$?$?$?$?$
#11
10-18-2007, 02:28 PM
RE: Fuel injection v Carb ?$?$?$?$?$?$
ORIGINAL: Frisian HD
Isit possible to rebuild your Harley back from injection to carburator?
I mean if you can build your carb-version to injection, it must be possible the otherway round, or what?
Isit possible to rebuild your Harley back from injection to carburator?
I mean if you can build your carb-version to injection, it must be possible the otherway round, or what?
By the way EFI on the older bikes (pre closed loop) do not compinsate any better for altitude then the CV carb.
Still trying to learn more on the new closed loop bikes looking forward to after market computers. So far I don't like the way HD has put the O2 sensers in the pipes ecspecally the front pipe. (Closed loop is like the fuel injection in your car for those that don't know)
#13
10-25-2007, 05:15 AM
RE: Fuel injection v Carb ?$?$?$?$?$?$
The bottom line is: there are those of us who learned how to tune carbs and know how to correctly maintain them.A lot less expensive for me and quite a bit more enjoyable knowing that breakdowns are of no concern,and I do enjoy tinkering.Fuel injection is a great thing for those of you that just want to ride.
#14
10-25-2007, 11:14 AM
RE: Fuel injection v Carb ?$?$?$?$?$?$
The MM/EFI was not very good on my built '01 FLTRI. All kinds of tuning issues that were like throwing money down a hole. I finally got fed up and switched it to carb, it was a straight forward swap and no more expensive than another trip to some dyno clown. It was without a doubt the best mod I ever did to that bike! If I would have had a delphi, I would have not done the carb swap, plenty of guys out there that know how to tune them plus there's the T'Max and other auto tune wide band replacement systems available now. Except of course for the 08 Touring bikes which is what I have now.....
#15
10-25-2007, 11:35 AM
RE: Fuel injection v Carb ?$?$?$?$?$?$
ORIGINAL: Kenan
I have a 2003 injected Fat Boy with 18,000 miles. At the moment it is in the shop for the 3rd time, and $800 later they still can't find the problem. At low speeds it isn't too bad. The hesitation on the highway is so bad that sometimes the top speed is 50 MPH. In the shop, connected to the computer it looks fine. The black spark plgs would indicate that it is running too rich, sometimes. Changed the air filter, spark plugs and injectors so far. In general I like fuel injection but I'm not the one to ask at the moment. If anyone has some ideas I'm all ears.
I have a 2003 injected Fat Boy with 18,000 miles. At the moment it is in the shop for the 3rd time, and $800 later they still can't find the problem. At low speeds it isn't too bad. The hesitation on the highway is so bad that sometimes the top speed is 50 MPH. In the shop, connected to the computer it looks fine. The black spark plgs would indicate that it is running too rich, sometimes. Changed the air filter, spark plugs and injectors so far. In general I like fuel injection but I'm not the one to ask at the moment. If anyone has some ideas I'm all ears.
#16
11-01-2007, 08:23 PM
Road Captain
RE: Fuel injection v Carb ?$?$?$?$?$?$
I always hate this topic, but I have to comment.[:@]
Carbs are not as controllable/tunable as EFI. Carbs rely on physics to operate effectively. Carbs have a fairly narrow altitude tollerance.
EFI has a grid (map) that defines the fuel amount and duration for each pulse (usually 120 spaces each for fuel and spark). EFI relys on electronic timing matched to physical timing. EFI has a very broad altitude range (I have road my 03 RK from 100 feet below sea level to 14,110 feet above, no issues).
If carbs were better, top fuel dragsters would still be using them.
Carbs are not as controllable/tunable as EFI. Carbs rely on physics to operate effectively. Carbs have a fairly narrow altitude tollerance.
EFI has a grid (map) that defines the fuel amount and duration for each pulse (usually 120 spaces each for fuel and spark). EFI relys on electronic timing matched to physical timing. EFI has a very broad altitude range (I have road my 03 RK from 100 feet below sea level to 14,110 feet above, no issues).
If carbs were better, top fuel dragsters would still be using them.
#18
11-01-2007, 11:55 PM
Extreme HDF Member
Peter: You're right; it is scary.
#19
11-02-2007, 03:33 AM
RE: Fuel injection v Carb ?$?$?$?$?$?$
I have 68k miles on my 2000 Road King, which of course has the said to be crappy Marelli FI system on it. It has pretty much been bullet proof. The only thing that has gone bad is the fast idle acutator. I had it replaced once under warranty. It crapped out again a year or two later. I didn't replace it. You don't need it. All it does is hold the throttle a tad open on cold starts. Most of us haveused the throttle friction screw to do the same thing on carb bikes, anyway. It works the same for a FI bike.
I'm not worried about it breaking down and have all of the parts to replace if I need to. I got a complete FI system off of a bike from where a guy was doing a big build and wanted a carb. I got the whole system for the cost of shipping.
I'm not worried about it breaking down and have all of the parts to replace if I need to. I got a complete FI system off of a bike from where a guy was doing a big build and wanted a carb. I got the whole system for the cost of shipping.
#20
11-02-2007, 06:21 AM
RE: Fuel injection v Carb ?$?$?$?$?$?$
ORIGINAL: xxxflhrci
I have 68k miles on my 2000 Road King, which of course has the said to be crappy Marelli FI system on it. It has pretty much been bullet proof. The only thing that has gone bad is the fast idle acutator. I had it replaced once under warranty. It crapped out again a year or two later. I didn't replace it. You don't need it. All it does is hold the throttle a tad open on cold starts. Most of us haveused the throttle friction screw to do the same thing on carb bikes, anyway. It works the same for a FI bike.
I'm not worried about it breaking down and have all of the parts to replace if I need to. I got a complete FI system off of a bike from where a guy was doing a big build and wanted a carb. I got the whole system for the cost of shipping.
I have 68k miles on my 2000 Road King, which of course has the said to be crappy Marelli FI system on it. It has pretty much been bullet proof. The only thing that has gone bad is the fast idle acutator. I had it replaced once under warranty. It crapped out again a year or two later. I didn't replace it. You don't need it. All it does is hold the throttle a tad open on cold starts. Most of us haveused the throttle friction screw to do the same thing on carb bikes, anyway. It works the same for a FI bike.
I'm not worried about it breaking down and have all of the parts to replace if I need to. I got a complete FI system off of a bike from where a guy was doing a big build and wanted a carb. I got the whole system for the cost of shipping.