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  #13  
Old 09-29-2014, 06:49 PM
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Smile Re: Cetane ratings

Quote:
Originally Posted by ExcursionDiesel View Post
From reading this thread, it sounds to me like we don't have a clear way to know what Cetane rating is being sold without researching brands. Even then, diesel is a commodity fuel and some stations don't even source the same brand diesel as their gas. Without knowing the originating refinery, how do we really know? I try to stick with Shell stations since they seem to make an effort to provide an auto diesel pump in most locations.
Thank you ExcursionDiesel. Sounds like good advice. Do you have Valero stations where you are? That's another brand here in California that has diesel at most of their locations. I've searched their website which has a lot of good content but no mention of cetane. (I'm beginning to think I should not be concerned about it any longer

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  #14  
Old 09-30-2014, 09:19 PM
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Re: Cetane ratings

Quote:
Originally Posted by ExcursionDiesel View Post
From reading this thread, it sounds to me like we don't have a clear way to know what Cetane rating is being sold without researching brands. Even then, diesel is a commodity fuel and some stations don't even source the same brand diesel as their gas. Without knowing the originating refinery, how do we really know? I try to stick with Shell stations since they seem to make an effort to provide an auto diesel pump in most locations.
This is weard. I have little trouble downloading the Technical data Sheets (TDS) from Australian oil marketers but not from the US. It's like cetane number (CN) is a big secret. This is what I got from Shell and BP Australia
http://s08.static-shell.com/content/...-dieseltds.pdf
http://www.bp.com/content/dam/bp-cou...ate_Diesel.pdf
OK, it shows Cetane Index (CI) which is not exactly the same as CN but close. It's better than nothing. Note that this has no relation to Shell USA because you guys source your fuel elsewhere and have other regs. For the difference between CN and CI see,
https://en.wikipedia.org/wiki/Cetane_number
Here are some sites that might shed some light on CN in the States:
Diesel Fuel Cetane Rating - What Is Cetane?
The Diesel Diaries: Where to fill up? | Autoweek
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  #15  
Old 10-01-2014, 07:43 AM
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Re: Cetane ratings

Around here it's posted on all the pumps. I have never seen anything but 40 posted.
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  #16  
Old 10-01-2014, 05:51 PM
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Re: Cetane ratings

And in a weird twist of fate, in California, our Cetane rating is 53+. Odd that we get better diesel than other states, but since we get worse (and more expensive) gasoline, it evens out. I also recently learned that as Cetane ratings go up, the easier it is to combust - which is the exact opposite of gasoline grades (higher numbers = harder to combust). But with diesels, easier to combust fuel allows a cleaner and more complete burn, which is better for the environment.
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Old 10-01-2014, 07:55 PM
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Re: Cetane ratings

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Originally Posted by hayasa View Post
And in a weird twist of fate, in California, our Cetane rating is 53+. Odd that we get better diesel than other states, but since we get worse (and more expensive) gasoline, it evens out. I also recently learned that as Cetane ratings go up, the easier it is to combust - which is the exact opposite of gasoline grades (higher numbers = harder to combust). But with diesels, easier to combust fuel allows a cleaner and more complete burn, which is better for the environment.
"Easier to combust" translates to "combust earlier in the compression stroke". This can create higher cylinder pressures and stresses on connecting rods and pistons. It is essentially the same as advancing the timing in a gasser. Higher rpm ignition is aided. I have no idea if the Bosch controller adjusts the injection timing if ignition is too early.
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  #18  
Old 10-01-2014, 10:52 PM
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Re: Cetane ratings

Quote:
Originally Posted by hayasa View Post
And in a weird twist of fate, in California, our Cetane rating is 53+. Odd that we get better diesel than other states, but since we get worse (and more expensive) gasoline, it evens out. I also recently learned that as Cetane ratings go up, the easier it is to combust - which is the exact opposite of gasoline grades (higher numbers = harder to combust). But with diesels, easier to combust fuel allows a cleaner and more complete burn, which is better for the environment.
That would be to do with your higher emissions regulations. This study shows that by increasing CN by 5, reduces NOx by 2%
http://www.epa.gov/oms/models/analysis/r03002.pdf
The spinoff benefit is smoother running and possibly better fuel consumption.

BTW, diesels require fuel to detonate - the quicker the better - high cetane, low octane. Gasoline engines require a smooth burn - the smoother the better - low cetane and high octane. If gasoline detonates in an engine, ones gets knocking (pinging) which will eventually damage the engine. Diesels inherently always knock but are beefed up to take it.
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Old 10-02-2014, 01:13 AM
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Re: Cetane ratings

Quote:
Originally Posted by ExcursionDiesel View Post
"Easier to combust" translates to "combust earlier in the compression stroke". This can create higher cylinder pressures and stresses on connecting rods and pistons. It is essentially the same as advancing the timing in a gasser. Higher rpm ignition is aided. I have no idea if the Bosch controller adjusts the injection timing if ignition is too early.
Excursion Diesel - that's an excellent point, and exactly why I started this thread. I'm well aware that the timing of the combustion is very important to the well being and efficiency of the engine.(I spend my working career flying airplanes and I always want to be very nice to my engines!) My original question was - is there an optimum cetane rating for the 3.0 L turbodiesel in our Grand Cherokees. I'm not sure how much it matters, and just maybe, as you say, the Bosch controller adjusts for that, which would then make the question moot. That would be great, if so. (I know how many people think that Premium gasoline is "better" than regular, which of course is not true. Since I'm new to Diesels and never even heard of cetane until I started reading up I've turned to this forum to get some no-nonsense answers.) Thanks to all!
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Old 10-02-2014, 09:56 PM
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Re: Cetane ratings

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Originally Posted by PlayGolf69 View Post
(I know how many people think that Premium gasoline is "better" than regular, which of course is not true. Since I'm new to Diesels and never even heard of cetane until I started reading up I've turned to this forum to get some no-nonsense answers.) Thanks to all!
I don't know about the States but here in Oz there is a difference, however slight, between normal "truck" diesel and "premium" diesel. Yes, it is all the same basic ULS diesel stock but in the case of BP, their premium brand "Ultimate Diesel" includes additives for lubricity, detergent, corrosion prevention, anti-foaming and a deodoriser. Also, truck diesel comes through high-flow pumps but premium diesel comes through low-flow pumps which include and additional line filter. I imagine the other big brands would be much the same. Premium costs a few cents more but I think the VM Motori motor is worth pampering.
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Old 10-02-2014, 10:13 PM
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Re: Cetane ratings

I'm glad I just happened upon this thread while dreaming of my Diesel GC.
I don't have a diesel grand Cherokee but I just filled up my parents 01 gmc Sierra duramax at a new sheetz, and on the pump button it had a 'cetane 40' label. I wondered what it is, now I know!
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  #22  
Old 10-04-2014, 07:42 AM
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Re: Cetane ratings

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Originally Posted by farmerbrake View Post
I'm glad I just happened upon this thread while dreaming of my Diesel GC.
I don't have a diesel grand Cherokee but I just filled up my parents 01 gmc Sierra duramax at a new sheetz, and on the pump button it had a 'cetane 40' label. I wondered what it is, now I know!
That's fine for the 13 year old Duromax or a tractor but for the Jeep, I'd be hunting around for the highest cetane you can get and stick with it. If everyone did that the oil companies will get the message.
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