Royal Purple Max-Boost (Page 2/2)
sanderson231 JUL 27, 01:14 PM
Top Tier gasoline relates to premium additive packages such as detergents and oxidation stabilizers. These have no effect on octane. The Royal Purple Max-Boost although primarily an octane booster containing MMT also appears to at least contain a stabilizer.

MMT is an octane booster which acts similarly to lead. I spent 41 years in the oil refining business retiring in 2015. None of the majors or big independents are blending MMT in their gasoline. Perhaps there is a small operation somewhere blending MMT but I doubt it.

Here is the EPA position on MMT updated Jan-22:

https://www.epa.gov/gasolin...res%20of%20vehicles.

Too much future health uncertainty using it and bad optics since the Environmental Defense Fund, Sierra Club et al have all taken positions against it.

I see no reason to use Max-Boost or similar products for their additive package if octane is no concern. Just buy good quality gasoline - I usually buy from Shell when at home.

I am planning a Quad 4 build with 11.5:1 compression and although 93 octane is readily available here, I doubt that 93 is high enough. That's why I am interested in the long term experience of other people who have used MMT octane boosters.

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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged

Patrick JUL 27, 04:16 PM

quote
Originally posted by sanderson231:

I am planning a Quad 4 build with 11.5:1 compression and although 93 octane is readily available here, I doubt that 93 is high enough. That's why I am interested in the long term experience of other people who have used MMT octane boosters.



I understand the potential for more power with a higher compression ratio, but in this day and age, is it really worthwhile building an engine that requires non-readily available fuel?

I have a JDM Subie that requires 94 octane. Only Chevron sells it locally, and of course, it's the most expensive gas in a market that has the highest fuel prices in North America. I think I'd be willing to sacrifice a bit of power in order to make use of a more readily available, less expensive gas option.

[This message has been edited by Patrick (edited 07-27-2022).]

sanderson231 JUL 27, 05:44 PM
I will be far from a daily driver. I just want to build the ultimate Quad 4.

The Lucas octane booster sells for about $8 per 15 oz bottle on-line. The recommended dosage is one bottle per 25 gallons of gas. At this dosage it should give about a 3 octane number boost and the cost per gallon is about 40 cents = cheaper than buying premium at the pump!

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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged

Patrick JUL 27, 06:11 PM

quote
Originally posted by sanderson231:

I just want to build the ultimate Quad 4.



Okay, gotcha. A man's got to do what a man's got to do.


quote
Originally posted by sanderson231:

... and the cost per gallon is about 40 cents = cheaper than buying premium at the pump!



I had briefly considered that option when I bought the Subie, but I just didn't want to be messing around with having to figure out how much gypsy juice to be adding each time I bought gas. There seemed to be a potential element of error involved with each fill up (unless of course I bought exactly the same amount of gas each time). I don't drive the Subie much (it had originally been bought for autocross), so it's just so much easier to go to the local Chevron station and buy their expensive 94 octane gas.

Here's a recent example of gas prices locally. At first, it may appear that these prices are pretty good... until you realize this isn't the price per gallon... it's the price per litre... and there's almost four litres to a gallon!
sanderson231 JUL 27, 07:28 PM
This brochure has a graph of how MMT improves octane. The octane at the pump is the average of Research octane (RON) and Motor Octane (MON). The pump octane is known as R+M/2.

https://www.aftonchemical.c...000_PDS.pdf?ext=.pdf

The legal amount of MMT in the US is 8.3 mg/l which according to the chart should give about 1 R+M/2 octane. I can't find the reference any more but from it I determined that Lucas octane boost had about 5X the legal amount when used at the recommended dosage. This would give about 2.5 R+M/2 octane.

Back in the 60's the pump octane was RON so it wasn't unusual to see 100 octane gas.

Hope this helps

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formerly known as sanderson
1984 Quad 4
1886 SE 2.8L
1988 4.9L Cadillac
1988 3800 Supercharged