Piston Wash, how does this look to you?

maxwell

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500km at 10lbs boost. 50/50 c12 fuel. 100:1 premix oil

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Clode

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Correct me if I am wrong, but since the fuel is injected directly in to the combustion chamber on an Etec, piston wash reading is useless. Piston wash is fuel cleaning the edge of a piston when entering the combustion chamber from a transfer port.

Do you have extra injectors in the intake? The head is really clean so I think you're getting lots of fuel.
 
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oler1234

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As noted above it’s direct injection.

if you ask me it looks rich. Mag side more than PTO. Should be more carbon on the crown, right now you washing it clean.

check you o2 sensor calibration or get a new sensor. If running leaded fuel sometimes it will throw the readings off.
 

maxwell

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yah i think i need a new 02 sensor its probably 5 years old. sled runs great but using fuel like crazy and its readying low 14s...so that doesnt add up.
 

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If you've ever run 100LL (avgas), LL stands for low lead, buts that's relative. 100LL is actually pretty high in lead compared to the old leaded car gas, and the first symptom is contaminated O2 sensors.

Thanks for this thread. I was under the impression that an etec didn't have an O2 sensor. I had planned to put some 100LL into the fuel instead of Stabil for the summer. Won't do that now!
 

Lund

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Yup i agree your heavy on the fuel, a lot of wash going on.
Your O2 sensor i would not trust being your running C12, a leaded fuel, its most likely shorted out. When i ran C12 i use to change the O2 sensor atleast twice during the season. Otherwise it would give off the wall reading's.
 

oler1234

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yah i think i need a new 02 sensor its probably 5 years old. sled runs great but using fuel like crazy and its readying low 14s...so that doesnt add up.


From what your saying it is definitely off. At 10lbs you should use mayby 5 litres more than your stock counterparts. Is it popping/backfiring in the exhaust pipe. If so, you rich
 

oler1234

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If you've ever run 100LL (avgas), LL stands for low lead, buts that's relative. 100LL is actually pretty high in lead compared to the old leaded car gas, and the first symptom is contaminated O2 sensors.

Thanks for this thread. I was under the impression that an etec didn't have an O2 sensor. I had planned to put some 100LL into the fuel instead of Stabil for the summer. Won't do that now!


Av gas will not hurt the etec system. Been running it all year.
 

Rotax_Kid

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As noted above, wash is very difficult to get much out of on an Etec. I wouldn't trust a 02 sensor that is more than a season old, or if it weren't a Bosch sensor either. Never had much luck with anything else. Where is the sensor located? Location will also give a variety of readings in my experience.
 

NoBrakes!

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Av gas will not hurt the etec system. Been running it all year.
Do you notice any lead dropout in the exhaust? Like powdery white/grey dust? We run av in the race boats, headers are full of it and exhaust ports.
 

maxwell

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Do you notice any lead dropout in the exhaust? Like powdery white/grey dust? We run av in the race boats, headers are full of it and exhaust ports.


my friends turbo etec is in my shop right now pulled apart. 5000km boosted on av gas. the reed boots are coated in that white poweder your talking about. so much so that i would be concerned about engine damage had we left it any longer without cleaning it up. i was wondering what that was
 

Merc63

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Leaded fuel can kill an O2 sensor in a matter of hours. I would avoid leaded fuel like the plague if your running closed loop with o2 feedback.

Search for Fuse Racing fuels, I run this in my car, 116oct no lead of ethanol for $7xx a drum. You can mix it 50/50 with Husky 94 oct and still have 110 octane fuel. I was running this combo with 12psi boost at 11.3:1 compression, worked great. Fuse is reportedly the old Shell URT guys. There is a local retailer in Edmonton, he will drop it right off at your house.
 

Merc63

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Nope, its called Fuse, Ignitor series, 116oct and they have up to 125oct I think.

Check the Alberta's Fastest street car list, lots of the top guys are running it. Ive tested it myself, made great power.
 

oler1234

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Do you notice any lead dropout in the exhaust? Like powdery white/grey dust? We run av in the race boats, headers are full of it and exhaust ports.


In on a lean situation I will see grey/white. But not a build up where it drops out. My etec runs around 16-18 on the afr gauge down the trail. Basically anything less than 40% throttle opening. When running down the trail with a extremely rich tune closer to 12-13.5, runs like garbage, i do not see it at all.

keep in mind, my boost setup differs from many conventional etec s in that all my fueling is controlled by the stock injectors. No secondary injectors. With that said, av gas has not hurt the stock etec system, running a set of secondary injectors you may see different things.
 

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Is this a turbo of NA ? Looks rich for a NA but for a turbo would be on the lean side for sure. Don’t over octane if your not running big boost 94 non ethanol or SL 99 for up to 10-12 psi is all you need. Loose bottom end and power with to much octane. Stay away from AV it works but it’s not designed for sleds it’s designed to run at a constant 3500 rpm. It’s Low led and about 96 octane because it is rated different for air craft. It can handle lots of boost because of it’s makeup but it definitely sacrifices low end response and kill fuel filters fast. AV also burns much slower then pump or race fuels so will show a richer burn on the same tune
 

maxwell

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Is this a turbo of NA ? Looks rich for a NA but for a turbo would be on the lean side for sure. Don’t over octane if your not running big boost 94 non ethanol or SL 99 for up to 10-12 psi is all you need. Loose bottom end and power with to much octane. Stay away from AV it works but it’s not designed for sleds it’s designed to run at a constant 3500 rpm. It’s Low led and about 96 octane because it is rated different for air craft. It can handle lots of boost because of it’s makeup but it definitely sacrifices low end response and kill fuel filters fast. AV also burns much slower then pump or race fuels so will show a richer burn on the same tune

i cant add any more fuel to the map without it bogging on the top end.
 

ktmsx350f

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i cant add any more fuel to the map without it bogging on the top end.

Cut an old spark plug open in a V shape makes it easy to read. Obviously pull it out and swap it after some good pulls not a 20 km trail ride off the mounts. If you can’t add any more fuel with out a bog on top you could be rich. After the trail ride down isn’t the best way to read. Your fuel mix of C12 you are probably way over octane too. I ran my BD etec with about 25-30% furry and pump up to 10 psi no det. If your buying C12 and diluting it to 50:50 try some SL99 from AFD in Edmonton it’s about the same octane and will cost less
 

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Other thing to consider along with the fuel being directly injected is the oil consumption on these sleds. Typically to have "wash", you are "washing" the burnt oil / sulphated ash off the piston head and dome. considerable amounts used to accumulate at idle on the older sleds. With oil consumption so low on your etec (virtually shuts off oil at idle), its just not depositing the ash that you need to generate an accurate reading like the old days.

Plug chop would maybe be a better indicator of fueling.
 
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