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Old 01-23-2008, 01:10 PM   #1
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Methyl Hydrate to fuel ratio?

I'm planning on starting my 87 GTA today, which has been a long time coming... the car has about 1/4 tank of fuel already in it (which I'm betting is 87 octane), and I've bought 2 gallons of premium gas. How much methyl hydrate should I throw in the mix?
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Old 01-23-2008, 01:17 PM   #2
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Re: Methyl Hydrate to fuel ratio?

How long has it been sitting?
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Old 01-23-2008, 03:05 PM   #3
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Re: Methyl Hydrate to fuel ratio?

About 3 years...
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Old 01-23-2008, 03:11 PM   #4
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Re: Methyl Hydrate to fuel ratio?

I'd be tempted to just fill it and start it. Don't worry about premium, it won't care.
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Old 01-23-2008, 04:27 PM   #5
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Re: Methyl Hydrate to fuel ratio?

If it had 1/4 tank of gas in there for 3 years, i'd think there's going to be some moisture in there.
How do you feel about siphoning out what's in there? It's probably junk now.

Then i'd add a liter or two of that methyl hydrate, it's not an exact science, then fill it up to the TOP with gasoline. Then fire it up. I'd change the oil first of course too, and probably squirt some oil in each spark plug hole, and rotate the engine over by hand a rotation or two. It'll be pretty miserable during the first fire up, but half an hour later and it should be good as new.
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Old 01-23-2008, 06:20 PM   #6
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Re: Methyl Hydrate to fuel ratio?

Well, we decided to mix the new and old fuels, and added about a 1/3 or 1/2 liter of methyl hydrate, and the car started up second try! It feels like it's idling a little low though, at about 600 rpms... but hey, she sounds great. WOOHOO!!!

Now all thats left is to changed the wheel bearings, fix the sticky throttle, and check the brakes!
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Old 01-23-2008, 07:33 PM   #7
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Re: Methyl Hydrate to fuel ratio?

Why are you putting methyl hydrate in your fuel?

The most common use for it in a gas engine is a gas line antifreeze. You put about a cup full into a full tank to keep the fuel from freezing. Methanol is also hygroscopic. It absorbs water.

Although I've never had to test the theory, if you have a car that has problems passing emission testing, put about a liter (quart) into a full tank. I personally wouldn't put any more in. Making a home brew octane booster, you don't put any more than 10% methanol. That means you have a 5 gallon fuel can with 4.5 gallons of gas and 0.5 gallons of methanol. With 92 octane pump gas, you can increase it to 94.3 however the increased level of methanol may require more jetting. Methanol is mildly corrosive and will eat gas tank linings, rubber and aluminum if used in excessive ratios.

My engine runs on 100% methyl hydrate. To switch a carb over, all the passages and jets need to be larger because you need to burn about twice as much fuel as gasoline. The entire fuel system also needs to be upgraded to move a lot more fuel.

With the cost of methanol increasing, it may be cheaper for you to just buy high octane unleaded fuel providing you need it. You only need enough octane to prevent detonation. There's no more BTU energy in 87 octane than there is in 92 octane.

Since the car was sitting for so long, change the fuel filter too.
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Old 01-23-2008, 10:44 PM   #8
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Re: Methyl Hydrate to fuel ratio?

To change the filter I will have to take it to a shop, the whole assembly is corroded beyond recognition... As for the methyl, I put it in to help dissipate the water.. bad idea???
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Old 01-23-2008, 11:13 PM   #9
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Re: Methyl Hydrate to fuel ratio?

Quote:
Originally Posted by meiklejohn86 View Post
bad idea???
Nope. Just as long as you don't overdo it. As mentioned above, a cup full is enough.
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