ALH injection timing question

So the way I understand it, high cetane fuels like GTL and HVO will advance injection timing compared to standard diesel #2 because combustion begins earlier during compression.

If you are using a high cetane fuel with 60-70 CN do you need to compensate for this to get an ideal spot when setting the injection timing in an ALH?

If so, how much does it need to be retarded? Is there a formula or standard for this?

I don't think so, when the car is running the timing is dynamic.
But of course, I don't really know.
This forum should have some info-
Alternative Diesel Fuels (Biodiesel, WVO, SVO, BTL, GTL etc)

Idunno either.

Maybe the new engines with all the electrickery can adjust timing to suit the fuel.

I don't fink the controlers on VE engines are that smart. I thought timing curves are programmed.

How much difference does cetane rating really make?

CleverUserName said:

If you are using a high cetane fuel with 60-70 CN

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Where are you getting this type of fuel?


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mjez said:

Where are you getting this type of fuel?


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HVO is sold in California. It’s cetane number is 65-75 CN.

KLXD said:

Idunno either.

Maybe the new engines with all the electrickery can adjust timing to suit the fuel.

I don't fink the controlers on VE engines are that smart. I thought timing curves are programmed.

How much difference does cetane rating really make?

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It would depend on high it is. I think 100 is maximum value. Higher cetane number = shorter delay and earlier peak cylinder pressure.

Interesting, I had no idea there was such a thing. Is it more expensive than a regular diesel? Also, I would assume it can't be used in newer diesel engines that recommend no more than 5% biodiesel, right?

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mjez said:

Interesting, I had no idea there was such a thing. Is it more expensive than a regular diesel? Also, I would assume it can't be used in newer diesel engines that recommend no more than 5% biodiesel, right?

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HVO is AKA Renewable Diesel. It’s sold by a number of stations. It’s marketed as Propel HPR and is mostly known under that name.

It’s > 98% renewable diesel and completely different than Biodiesel. It’s meets all ASTM minimum specs for Diesel #2. It’s cheaper than D #2 because it’s subsidized by the state of CA as an alternative fuel.

Where I live I have to drive an hour just to get B20.

BobnOH said:

Where I live I have to drive an hour just to get B20.

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Here in suburbs of Chicago everything is biodiesel except for Meijer and Sam's Club stores. It really sucks if you have a newer diesel since you're not suppose to put biodiesel in those.

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