Well, I took Mark's advise and called a diesel specilist and told him my "Story". He said immediately that if its a Japaneese tractor made to run in Japan that Japan's diesel fuel is MUCH better than ours. And a tractor could be hard to start in the US Expecially at high elevation due to poor diesel. He suggested a double dose of Cetane improover and Premium Diesel if possible.
I was also told the it is very possible that the compression ratio for Japanese tractors is lower than ones made for U.S. diesel fuel. He said he would not be supprised to find 18:1 or even a little lower on tractors made for Japaneese Markets due to their GOOD diesel. That combined with high elevations and poor diesel WILL make a tractor hard to start in cold temps.
Here is a quote from an artical I read.
"Aromatic hydrocarbons have poor self-ignition qualities, so that diesel fuels containing a high fraction of aromatics tend to have low cetane numbers. Typical cetane values for straight run diesel are in the range of 50-55; those for highly aromatic diesel fuels are typically 40 to 45, and may be even lower. This produces more difficulty in cold starting, and increased combustion noise, HC, and NOx due to the increased ignition delay."
U.S. Diesel is highly aromatic. IE 40 to 45 Cetane
Japanese is Low aromatic IE 50 to 55 Cetain
Going to try to increase my Cetane #s and see what happens.
I was also told the it is very possible that the compression ratio for Japanese tractors is lower than ones made for U.S. diesel fuel. He said he would not be supprised to find 18:1 or even a little lower on tractors made for Japaneese Markets due to their GOOD diesel. That combined with high elevations and poor diesel WILL make a tractor hard to start in cold temps.
Here is a quote from an artical I read.
"Aromatic hydrocarbons have poor self-ignition qualities, so that diesel fuels containing a high fraction of aromatics tend to have low cetane numbers. Typical cetane values for straight run diesel are in the range of 50-55; those for highly aromatic diesel fuels are typically 40 to 45, and may be even lower. This produces more difficulty in cold starting, and increased combustion noise, HC, and NOx due to the increased ignition delay."
U.S. Diesel is highly aromatic. IE 40 to 45 Cetane
Japanese is Low aromatic IE 50 to 55 Cetain
Going to try to increase my Cetane #s and see what happens.
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