Hello
I'm planning to tune the carburetor. I can go to the car shop and use a gas analyzer. It shows lambda value. Of course when I ask a guy in the shop, he said that lambda should be 1. Looking at this table it of course mean that AFR should be 14.7. But when I’m reading forum I know that AFR should be less (rich mixture). So the question is what lambda should I obtain during tuning.
There is nice table for conversion AFR to lambda:
http://www.tatech.fi/cms/uploads/Lambda_vs_AFR.pdf
My bike has RevTech 100 inches Evo style engine, Mikuni HSR 42 carb, single fire ignition with dual plug heads. I have straight drag pipes. When I’m reading posts there is a lot of different information that the best (and most safe) is AFR about13.2-13.8 (the range is from 12.5 up to 14). It’s mean that lambda should not be 1 but less about 0.90-0.94. But let me know what value should I set. I prefer value that will be safe for engine, to not go to hot.
And question what to do before tuning. Run few miles of course. What temperature of oil should I have before tuning and how many RPM should I have during tuning? Should I set about 1000 RPM? During tuning what values AFR/lambda should I have on idle and what values should I have on for example 2000 RPM?
Sorry for a lot of questions but I want to do it correctly and there is a lot of different values AFR and I think mostly for TwinCams not carburetor.
Best regards, Piotr
PS. Maybe you can also give me other values like CO, CO2, HCH ......
I'm planning to tune the carburetor. I can go to the car shop and use a gas analyzer. It shows lambda value. Of course when I ask a guy in the shop, he said that lambda should be 1. Looking at this table it of course mean that AFR should be 14.7. But when I’m reading forum I know that AFR should be less (rich mixture). So the question is what lambda should I obtain during tuning.
There is nice table for conversion AFR to lambda:
http://www.tatech.fi/cms/uploads/Lambda_vs_AFR.pdf
My bike has RevTech 100 inches Evo style engine, Mikuni HSR 42 carb, single fire ignition with dual plug heads. I have straight drag pipes. When I’m reading posts there is a lot of different information that the best (and most safe) is AFR about13.2-13.8 (the range is from 12.5 up to 14). It’s mean that lambda should not be 1 but less about 0.90-0.94. But let me know what value should I set. I prefer value that will be safe for engine, to not go to hot.
And question what to do before tuning. Run few miles of course. What temperature of oil should I have before tuning and how many RPM should I have during tuning? Should I set about 1000 RPM? During tuning what values AFR/lambda should I have on idle and what values should I have on for example 2000 RPM?
Sorry for a lot of questions but I want to do it correctly and there is a lot of different values AFR and I think mostly for TwinCams not carburetor.
Best regards, Piotr
PS. Maybe you can also give me other values like CO, CO2, HCH ......