Fuel Injection to Carbs on a TC96

[the_monster]

just going on the factory manual and the data logged on my pro race tuner

[Scotty]

Pro race tuner is different from stock HD settings, correct me if i am wrong but the pro race tuner lets you adjust the idle settings.

These two bikes i have here are running on stock HD settings as i am sure most bikes are.
As far as i know HD's stock idle setting is around 1000 rpm when hot and 1300 rpm on start up.

[grbrown]

Originally Posted by Roy

Cheers

Must admit one of my 1st thoughts on changing to carb was purely 'aesthetic' in that I wanted that traditional harley slow tickover,

Cheers, Roy

Roy,

Slightly mystified by this! Most Harleys I have heard ticking over slowly are doing so too slow for their own good. Correct tickover is around 1,000rpm, so if your bike is doing that leave the poor thing well alone!

Early fuel injection systems, on cars and bikes, were a bit ropey, so changing them for a carb was sort of understandable, but recent ones are much better. You have the latest available and should give it a chance.

And forget all about 'slow tickovers'!

[the_monster]

re the pro turner, yes you can reset the idle along with any other of the electronics on it (my bike does have a different map on it to standard factory one )


although more expensive than power commander, fuel paks etc, it's superior tuning capabilities mean you should be able to get the engine to run smoothly for tickover to redline

the standard setting is about 950 rpm when warm.

back to the main theme, nothing you do however carb or efi wise will make it sound like the older long stroke motors

[grbrown]

Originally Posted by the_monster

back to the main theme, nothing you do however carb or efi wise will make it sound like the older long stroke motors

Good point! My first Harley was a shovel. When hot, ticking over it 4-stroked on the front pot and 8-stroked on the rear. It would also stop dead from this happy-sounding state, for no good reason, usually in the most awkward circumstances. Something to reminisce about, but not to yearn for or go back to!

[the_monster]

Originally Posted by grbrown

Good point! My first Harley was a shovel. When hot, ticking over it 4-stroked on the front pot and 8-stroked on the rear. It would also stop dead from this happy-sounding state, for no good reason, usually in the most awkward circumstances. Something to reminisce about, but not to yearn for or go back to!

that would be after the 17 or so miles it took for the engine to warm up and run properly on both cylinders !

[Scotty]

Originally Posted by grbrown

Roy,


Early fuel injection systems, on cars and bikes, were a bit ropey, so changing them for a carb was sort of understandable, but recent ones are much better. You have the latest available and should give it a chance.

As you say EFI works great on cars and a lot of bikes, but they are liquid cooled.
Harleys on the other hand being air cooled, in my opinion are always gonna have slightly insecure EFI, due to very variable engine temps and the narowband o2 sensors that restrict adjustment.
EFI needs constant engine temps to work 100% eficiently.

In my eyes a carb is more reliable, gets rid of aroung 10 pieces of elecrtonic witchcraft, performs as well as EFI and is easier to tune. And your motor runs far cooler.

I'm gonna convert this XR at the end of summer if the AMM-P3 ignition unit works with my bike (which the manufacturers recon it does)

Here is a challenge for you.....Find a EFI Harley engine with the same mods as a carburated Harley enging that puts out more power!

[the_monster]

the efi system is designed to take reading every millisecond the engine is running, and is programmed to take a number of actions to cool the engine, these include automatically richening the air/fuel mix or interrupting the fuel injector pluses and draw air into to help cool the engine (when the bike is stationary) - it is often perceived as a misfire.

I'm not aware of a carb that can do any of that. (well apart my S&S when the shovel has shaken the mounting loose - again )

The other thing is with the pro tuner is that the bike doesn't suffer the problems that the fuel pack / power commander do.

each to their own at the end of the day.

[Roger]

Start a new thread if you wish to discuss the pros and cons of EFI please

[grbrown]

Originally Posted by Scotty

In my eyes a carb is more reliable, gets rid of aroung 10 pieces of elecrtonic witchcraft, performs as well as EFI and is easier to tune. And your motor runs far cooler.

Here is a challenge for you.....Find a EFI Harley engine with the same mods as a carburated Harley engine that puts out more power!

Scotty,

If you make those mods, your bike will still be dependent upon electronics, in the form of the charging circuit and ignition system. Even my indicators use an electronic module. Harley were one of the first bike makers to adopt some of this stuff. So unless you fit a magneto or points ignition you are still going to need to keep your peace with the witches!

Stop being a dinosaur and recognise that you are enjoying the benefits of some pretty hi-tech stuff on your bike. Only if it packs up is it worth considering throwing it away.

As for your challenge, why do you believe it cannot be done?