Pulled the head off today... opinions on that redish color on cylinders 5 and 6? Is that just the junk left from the additives in the gas?
Tops of pistons:
5 and 6 on the head
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| Author: | ValiantBoyWonder [ Wed Apr 20, 2016 1:51 pm ] |
| Post subject: | Funny Colors in my (cylinder) head |
Pulled the head off today... opinions on that redish color on cylinders 5 and 6? Is that just the junk left from the additives in the gas? Tops of pistons: 5 and 6 on the head
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| Author: | '67 Dart 270 [ Thu Apr 21, 2016 8:50 am ] |
| Post subject: | Yes additives |
Have you by chance been using an octane boost product? Many of these contain organic/metal complexes that leave reddish residues upon combustion. |
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| Author: | '67 Dart 270 [ Thu Apr 21, 2016 9:02 am ] |
| Post subject: | ...for example |
Methylcyclopentadienyl manganese tricarbonyl (MMT) - leaves magnesium oxide deposits Ferrocene - leaves iron oxide deposits Iron pentacarbonyl - leaves iron oxide deposits They all are effective at raising octane level but are self defeating because they also eventually leave crust that promotes detonation, particularly the iron compounds. Best octane boost available is either tetra ethyl lead or even better is iso-octane, otherwise known as 2,2,4-trimethyl pentane. Brian |
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| Author: | '67 Dart 270 [ Thu Apr 21, 2016 9:04 am ] |
| Post subject: | Correction |
Sorry, obviously MMT leaves manganese deposits not magnesium |
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| Author: | ValiantBoyWonder [ Thu Apr 21, 2016 11:34 am ] |
| Post subject: | |
ahhh i see.... every 8,000 miles or so, i put water remover / octane booster in the gas tank.. many of the gas stations around where i live have water issues.. that explains the reddish color.. awesome.. thank you guys... |
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| Author: | '67 Dart 270 [ Thu Apr 21, 2016 12:57 pm ] |
| Post subject: | additives |
Water remover is fine, but those octane boosters are leaving the residues. b |
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| Author: | '67 Dart 270 [ Thu Apr 21, 2016 1:04 pm ] |
| Post subject: | iso-octane |
Forgot to mention, iso-octane is actually the standard for octane rating, it is 100 octane. Of all the isomers of octane, 2,2,4-trimethylpentane burns the most efficiently, because it isn't a long carbon chain, it's more of a spherical-shaped molecule and is thus very volatile and burns very evenly. When discussing fuels having octane ratings above 100, usually oxygenated additives are used to get the fuel to burn even better, faster, more evenly, e.g. alcohols, ethers, nitrous oxide, and the like. If you are going to use high octane fuels, stay away from additives with metals in them, better to use only organics, like alcohols, ethers, iso-octane. Brian |
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| Author: | nm9stheham [ Fri Apr 22, 2016 6:26 pm ] |
| Post subject: | |
I've been finding the reddish-brownish deposits in engines for decades with no octane boost. Nothing unusual.... I just assumed it was in the fuel additives. Now the orange color on that one valve is certainly different. |
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| Author: | '67 Dart 270 [ Fri Apr 22, 2016 8:38 pm ] |
| Post subject: | engine additives |
No telling what the various oil companies put in their gasoline. Many advertise "cleaning agents" and "detergents" and "corrosion inhibitors," can't say what these are and the regulators don't really put any responsibility on them to divulge what's in them. brian |
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