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Discussion Starter #1
Does anyone have the specs of the green fuel injectors compared to the red or black injectors? I believe that the black injectors are the stock injectors for the TC88??? I believe I have the stock injectors and 38mm TB on my 95" motor. It's running rich, but still pings. I have 50PSI on the fuel pump and SE heads and 204 cams. Are the green injectors too much for my application? Should I be using the red injectors? My PC USB III map shows I'm running rich in the 2000-2800rpm range and I still ping. I've dropped the timing by -3 degrees with little help.

Tks
BOBB

95" Road King
flat top
SE heads
204 cams
V&H true duals
V&H oval slip-ons
PC USB III
 

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Old Member
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2,896 Posts
You need to find the right map for your application.
 

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You would be wasting your money upgrading your injectors with your build. Need to retard timing some more to get rid of your ping @ 2000 - 2800 rpm, or use higher octane fuel.

Couple of links to calculate what injector you should be using:
http://www.rceng.com/technical.aspx
http://www.rbracing-rsr.com/fuelinjectors.htm

Black:
335cc/min @ 43.5psi
32.00Lb/Hr @ 43.5psi

Green:
370cc/min @ 43.5psi
35.24Lb/hr @ 43.5psi

Yellow:
450cc/min @ 43.5psi
42.86 Lb/hr @ 43.5psi
 

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Discussion Starter #4
Do you know which color injectors are stock for a 2000 TC88? I was told because of the SE heads, and 204 cam with the short intake duration, I'm building too much compression causing the pinging. It was suggested to change to a 211 cam and larger injectors and 42mm TB.

I'm running -1 to -3 timing at that range and may try -3 to -6. I have tried octane booster too...

Can you overdo the injector size, or will they just return the excess fuel back to the tank? Not sure how this works...

Thanks for all the good information.
Zeroroadkill



You would be wasting your money upgrading your injectors with your build. Need to retard timing some more to get rid of your ping @ 2000 - 2800 rpm, or use higher octane fuel.

Couple of links to calculate what injector you should be using:
http://www.rceng.com/technical.aspx
http://www.rbracing-rsr.com/fuelinjectors.htm

Black:
335cc/min @ 43.5psi
32.00Lb/Hr @ 43.5psi

Green:
370cc/min @ 43.5psi
35.24Lb/hr @ 43.5psi

Yellow:
450cc/min @ 43.5psi
42.86 Lb/hr @ 43.5psi
 

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Can you overdo the injector size, or will they just return the excess fuel back to the tank? Not sure how this works...

Thanks for all the good information.
Zeroroadkill
Yes to both questions. The injectors will only pass as much fuel as they are programmed to by the ECM. But you can still have too large of an injector. You should shoot for ~80% duty cycle at full throttle at max RPM.
 

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Do you know which color injectors are stock for a 2000 TC88? I was told because of the SE heads, and 204 cam with the short intake duration, I'm building too much compression causing the pinging. It was suggested to change to a 211 cam and larger injectors and 42mm TB.
Zeroroadkill
The specs I listed in my previous post was for 01+ injectors.

What is the PN on your injectors?

27135-97 (green/red) fits '99-'01 FL and is 29Lb/Hr
27218-95 (black) '95-'98 FL - 21Lb/Hr


IMO your pinging issue at 2000-2800 RPM isn't due to TB/injector size, I think symptoms of too small of a TB/injector would manifest itself at higher RPMs. But I'm not there dynoing your bike either.

I wonder if your cams are mis-indexed.
 

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I {Heart} Hookers.
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31,321 Posts
Read...... The 6th post in the thread, by Wild1.

http://forums.hotbikeweb.com/70/6434630/hot-bike-tech/upper-engine-tapping/index.html

It mirrors your problem of pinging and at the same rpms. Despite cam indexing being a problem, I don't think that's the case here.

You need to go back to basics and set timing according to the recommended specs on your cams, and get a MAP that's not running too lean in the midrange, where most bikes do, as that will contribute to lean running conditions.

Fuel injectors size issues generally show up when they're too small or don;t produce enough fuel after internal engine mods. Then, lean issues will be felt/seen. Too large of an injector can almost be over ridden with a MAP, and be less of an issue. Your issue, as Brian said, does not seem to be injector related.
 

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Discussion Starter #9
Pinging

I modified the map timing from -1 to -3 in the 1500-3000 range to -3 to -6. Now all I have to do is scrape the ice off my glasses and give her a test run. If this doesn't help, I may consider a set of gear driven 211 cams. I think the 211 has a longer intake duration than the 204? You don't happen to have the specs for both do you???

Tks
Zeroroadkill
 

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I {Heart} Hookers.
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31,321 Posts
SE211 Specifications:
Lift @ valve Intake/ Exhaust:
(.508”/.508”)
Duration @ .053 Intake/ Exhaust:
(248°/256°)
Timing @ .053 lift Open/Close:
(Intake: 23°BTDC/45°ABDC
Exhaust: 59°BBDC/17°ATDC) )
TDC Lift @ valve int/exh: (0.203”/.170”)

SE204 Specifications:
Lift @ valve Intake/ Exhaust:
(.508”/.508”)
Duration @ .053 Intake/ Exhaust:
(236°/240°)
Timing @ .053 lift Open/Close:
(Intake: 22°BTDC/34°ABDC
Exhaust: 52°BBDC/08°ATDC)
TDC Lift @ valve int/exh: (0.208”/.129”)
 

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Discussion Starter #11
Thanks, looking at these specs, is it true that the 204 is a low end torque cam and the 211 a mid range? I like the low end power especially 2-up and don't want to give that up with a cam change.

Thanks for all your time and info.
Zeroroadkill
 

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Discussion Starter #12
Dyno info?

Has anyone had a dyno at:
Jerry's Cycle Repair
63356 Nels Anderson Rd
Bend, Oregon 97701
Telephone: 541-318-3444
 

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SE211 Specifications:
Lift @ valve Intake/ Exhaust:
(.508”/.508”)
Duration @ .053 Intake/ Exhaust:
(248°/256°)
Timing @ .053 lift Open/Close:
(Intake: 23°BTDC/45°ABDC
Exhaust: 59°BBDC/17°ATDC) )
TDC Lift @ valve int/exh: (0.203”/.170”)

SE204 Specifications:
Lift @ valve Intake/ Exhaust:
(.508”/.508”)
Duration @ .053 Intake/ Exhaust:
(236°/240°)
Timing @ .053 lift Open/Close:
(Intake: 22°BTDC/34°ABDC
Exhaust: 52°BBDC/08°ATDC)
TDC Lift @ valve int/exh: (0.208”/.129”)
Is there anything you don't have? Man your like an encyclopedia:USA:
 
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