98' 900rr carb swap to a 02' 919 fuel injector - Honda Motorcycles - FireBlades.org
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post #1 of 24 Old 04-15-2010, 12:36 PM Thread Starter
 
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98' 900rr carb swap to a 02' 919 fuel injector

I know the honda 919 engine is based off the cbr 900rr engine. Has anyone done, or heard of anyone, installing a 919 fuel rail/ecu/wiring harness, in a cbr900rr? Would it be a tricky endeavour? I would think the payoff would be worth it.
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post #2 of 24 Old 04-15-2010, 1:19 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

do u think it is possible? swapping carbs to fi engine?
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post #3 of 24 Old 04-16-2010, 1:25 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

Arent the heads for a FI and Carb different? The FI head would have holes for the injectors. You'd have to see if you machine the ports for the injectors or see if the heads mights be interchangable to the same block.Hope someone has more info.
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post #4 of 24 Old 04-16-2010, 4:32 PM
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

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Originally Posted by Fireblade787 View Post
Arent the heads for a FI and Carb different? The FI head would have holes for the injectors. You'd have to see if you machine the ports for the injectors or see if the heads mights be interchangable to the same block.Hope someone has more info.

No, they're the same.
Bikes generally use throttle body injection, very few use direct injection.

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post #5 of 24 Old 04-16-2010, 4:37 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

You see!! I knew Bladeracer would come along and set things stright!!
So it's do-able?? Would the TBI bolt onto where the carbs go?? After that its all electrical...?

Hope your doing well BR!
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post #6 of 24 Old 04-16-2010, 10:25 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

if i m not mistaking then almost all the bikes are having IDI rather than DI so IDI or carb heads are same. But is it possible to swap carbs to FI bikes?

You see!! I knew Bladeracer would come along and set things stright!! <<< lol for me bladeracer is razorsharpguru
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post #7 of 24 Old 04-17-2010, 12:32 AM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

it seems like you would have to do something with the cams as well..as iam sure the lift duration would be slightly different than that of the 900. i would think with the added fuel, the intake and exhaust would need to be opened longer?or at different times.. other wise what would be the point in putting all that fuel into the heads..it would just be dumping fuel into the intake valve as it closed.. just a idea..obviouslly i dont know for sure as ive never done or known anyone to do that converstion.. just my 2cents
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post #8 of 24 Old 04-17-2010, 1:25 AM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

The fuel injection does not put more fuel into the engine. You can only put in so much fuel or the air/fuel ratio gets to rich (or lean), making the engine run worse, or burning a piston. The advantage of FI is that you can easily adjust the mixture to get the ideal air/fuel ratio.
I'm not sure about the cam timing issue. My guess it is should be fine.
luhms, this is a great idea. I hope you try to do it. I'm wondering what the hp gains might be.
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post #9 of 24 Old 04-17-2010, 7:30 AM
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

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Originally Posted by Fireblade787 View Post
You see!! I knew Bladeracer would come along and set things stright!!
So it's do-able?? Would the TBI bolt onto where the carbs go?? After that its all electrical...?

Hope your doing well BR!

The most difficult part would be mounting some of the sensors if the engine doesn't have them - the cam position sensor for example.
You would need all of the electrics from the FI bike - harness, ECU, sensors, instruments and probably the switch clusters and ignition switch if you don't want to mess with re-wiring.
And a Power Commander of course.

Thanks FB787 :-)
Getting there but I'm physically very weak still. Feel a bit like a big baby :-)

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Last edited by bladeracer; 04-17-2010 at 7:44 AM.
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post #10 of 24 Old 04-17-2010, 7:33 AM
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

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Originally Posted by chang9881 View Post
if i m not mistaking then almost all the bikes are having IDI rather than DI so IDI or carb heads are same. But is it possible to swap carbs to FI bikes?

You see!! I knew Bladeracer would come along and set things stright!! <<< lol for me bladeracer is razorsharpguru

Swapping carbs to an FI engine would be far easier as there are no sensors.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #11 of 24 Old 04-17-2010, 7:43 AM
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

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Originally Posted by ZeroKool929 View Post
it seems like you would have to do something with the cams as well..as iam sure the lift duration would be slightly different than that of the 900. i would think with the added fuel, the intake and exhaust would need to be opened longer?or at different times.. other wise what would be the point in putting all that fuel into the heads..it would just be dumping fuel into the intake valve as it closed.. just a idea..obviouslly i dont know for sure as ive never done or known anyone to do that converstion.. just my 2cents

The engine is only going to burn as much fuel/air mix as it can breathe.
Obviously you would need to remap the fueling using a PC or similar - just as if you were to drop 900RR cams into a 919 engine.

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post #12 of 24 Old 04-17-2010, 10:57 AM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

You would have to run the 919 cams.. their are no provisions on the 900's cams for the cam pulse rotor...and like bladeracer was saying you would need to somehow machine the head to accept the cam pulse sensor..With the amount of work involved iam not sure the payout would be worth it..as far as performance gains..they would seem to be very minimal..they only changed to FI for emissions and smoother power...not for some huge hp gain.. but please dont let me or anyone else discourage you...
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post #13 of 24 Old 04-17-2010, 11:03 AM
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

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Originally Posted by ZeroKool929 View Post
You would have to run the 919 cams.. their are no provisions on the 900's cams for the cam pulse rotor...and like bladeracer was saying you would need to somehow machine the head to accept the cam pulse sensor..With the amount of work involved iam not sure the payout would be worth it..as far as performance gains..they would seem to be very minimal..they only changed to FI for emissions and smoother power...not for some huge hp gain.. but please dont let me or anyone else discourage you...

You would have to fabricate the mount on the head for the cam pulse sensor. It would be a matter of drilling a hole in the head and either welding a mount up or building it up with an epoxy, filing it flat and bolting the sensor to it.
Welding the rotor to the cam wouldn't be any more difficult.
I wouldn't expect to see much gain in peak power but tuning to a more usable power curve would be much simpler than jetting carbs - especially if you plan to make other modifications later on.

"I won't forget that ride for a while. Maybe you're right. Living fast might be worth the final crash. Maybe that's the secret you fliers know." - Flight of the Intruder
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post #14 of 24 Old 04-17-2010, 12:33 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

wouldnt locating the rotor onto the cam of the 900 be an issue? how would you know what position to weld it to? i mean the 919 is bolted on..so there really no other way to install..where as the 900 theres nothing to reference location..i guess if you had a 919 on hand you could compare..but if that was the case i would just use the 919 if it was possible
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post #15 of 24 Old 04-17-2010, 12:37 PM
 
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Re: 98' 900rr carb swap to a 02' 919 fuel injector

well i guess if the bolt holes for the rotor are the same as the cam sprocket you could just line them up and weld away
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