Next Question! Fuel Injectors - Crazy CO values

[2 Wheel Wanderer]

Guys thanks for the info and devimau I tried the CO at 5% and at 3.5% and it definitely ran better at 3.5%. At 5% I could tell that there was too much fuel being thrown into the chamber, the engine perked up at the lower CO level.

[koko64]

Sorry to thread jack 2WW.
I would like to invite you guys talking about fuel like to join the thread "which octane?". Or we could start a fuel thread like George's oil thread.

I'm from Oz and am finding that not all fuel tuning data transfers very well across continents. I'm guessing that differences in fuel composition in different parts of the world has a significant effect on this.

Brad Blacks experiences with tuning are in the Australian context with the fuel here. I have certainly noticed how much of a lower octane you guys in the US can run than we can down here (even with the octane rating conversion). I have noticed jetting differences beyond what I was expecting for similar engine modifications on the same model carbureted  bikes.

I'm currently trying different brands and octane ratings for smoothness and clean running (particularly transitioning throttle and low throttle range). I dont have the dyno money available to test for outright power. I'll post my experiences in the "octane" thread.

I would like to explore this further.

[Gus Duc]

Hey Mauro,

Don't forget the bikes with the O2 sensors.......you can't balance the cyclinders on those unless you go open loop....... you tried to on mine but you ended up make one cylinder about 7% & the other was less than 1%.  As you can imagine, it ran terrible.......I wound the blades back in, changed the plugs & all was right with the world.  Well, almost, there was the issue with the oil seal.....

[2 Wheel Wanderer]

Sorry to thread jack 2WW.

No worries I learned a lot in my past few threads about CO adjustments, TB syncing, octane and how fuel burns in this one. Unfortunately I have to report I just did a leakdown test today and heard loud hissing from both cylinders through the oil cap. It looks like I need to replace the rings.

[mendoje]

I looked at the price for new OEM injectors $619 each. WOW!! I guess I'll have to find a place to get em cleaned.

$1200+ for a set of injectors?

Check out RC Engineering Inc, www.rceng.com. They know injectors! They supply injectors for all sorts of high performance applications, most of them are from $80 - $100 each.  They can also clean your injectors and provide a report on the spray pattern and mass flow of each one.

Jeff

[Howie]

No worries I learned a lot in my past few threads about CO adjustments, TB syncing, octane and how fuel burns in this one. Unfortunately I have to report I just did a leakdown test today and heard loud hissing from both cylinders through the oil cap. It looks like I need to replace the rings.

Don't panic yet.  Some compressed air will get by the rings.  Even more will get by the rings if the engine is not up to running temperature.  As a general spec, below 10% is acceptable on a warm engine.

[Speeddog]

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[2 Wheel Wanderer]

Alright I f*#ked up the Leakdown test and did it wrong, I retested and the rings are fine. I need to start a new thread cause I am kind of at a dead end on tuning this F*#KER.

[devimau]

gus, I remember quite well what happened with your bike.
@ first those guides didn't help and we managed to cover them u/w.
after that was taken care of those numbers came up because there was an issue as you stated with the valve seal dirting the mixture and as a consequence getting crazy co values, you can balance them a bit if the o2 sensor is on 1 pipe better than if it reads both @ the same time like you bike was but is not the best option, after that with that open loop ecu the bike ran better I think, right?
I still have nightmares about your bike but I'm happy that all went good for you and then you sold it.
Thanks for recommending the new owner to me and is nice to hear back from you again.

[Gus Duc]

gus, I remember quite well what happened with your bike.
@ first those guides didn't help and we managed to cover them u/w.
after that was taken care of those numbers came up because there was an issue as you stated with the valve seal dirting the mixture and as a consequence getting crazy co values, you can balance them a bit if the o2 sensor is on 1 pipe better than if it reads both @ the same time like you bike was but is not the best option, after that with that open loop ecu the bike ran better I think, right?
I still have nightmares about your bike but I'm happy that all went good for you and then you sold it.

Thanks for recommending the new owner to me and is nice to hear back from you again.

Close enough I suppose

You were the only part of Del Amo I trusted........thanks for trying to make bike right & I except the fact the everyone makes mistakes.  As long as you learn from them & not assume one problem is something else, it's all good.

Good luck with the new business