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Old 06-06-2013, 08:52 AM   #16
bwalsh
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Quote:
Originally Posted by Paebr332 View Post
Most fuel gauges are similar to an idiot light
Fixed.

Fuel gauges aren't precision measuring devises. Just a close estimate of how much fuel is in the tank. For example, I've never had a vehicle that had exactly half a tank of gas when the gauge was at half.
My truck has a rectangular fuel tank. No weird angles. It's fuel gauge doesn't move at all until I have been 150 miles then the mileage varies between each 1/4 mark. I can get close to 550 miles between fill ups. The mileage between each quarter after the needle starts to move is different too.
In other words, you can't judge how much gas you've used accurately by glancing at the fuel gauge. You would need to fill up from each 1/4 mark to narrow it down to what the OP is looking for.
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Old 06-07-2013, 11:09 PM   #17
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On a side note; has anybody wondered if their motor runs better on a rainy day?

All to do with cooling engine intake air, resulting in denser air for the mixture.


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Old 06-11-2013, 03:48 PM   #18
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Originally Posted by vortexau View Post
On a side note; has anybody wondered if their motor runs better on a rainy day?

All to do with cooling engine intake air, resulting in denser air for the mixture.

Yes, I've noticed this on a restored Triumph Bonneville that was built when 100 octane gasoline was commonly available.

I worked with a guy that had water-injection on his hot-rodded truck. The idea is that it allowed for higher compression ratios by cooling the combustion chambers.

Here's a wikipedia link:
https://en.wikipedia.org/wiki/Water_..._%28engines%29
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Old 06-11-2013, 03:58 PM   #19
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Originally Posted by Hoppalong View Post
Yes, I've noticed this on a restored Triumph Bonneville that was built when 100 octane gasoline was commonly available.

I worked with a guy that had water-injection on his hot-rodded truck. The idea is that it allowed for higher compression ratios by cooling the combustion chambers.

Here's a wikipedia link:
https://en.wikipedia.org/wiki/Water_..._%28engines%29
Water injection was used in WWII aircraft to retard detonation at high boost pressures. It was 50/50 Methanol/water. Straight water doesn't work as well.
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Old 06-11-2013, 08:12 PM   #20
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Originally Posted by ttpete View Post
Water injection was used in WWII aircraft to retard detonation at high boost pressures. It was 50/50 Methanol/water. Straight water doesn't work as well.
Straight water freezes at altitude. It gets freaking cold above 10,000 feet.
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Old 06-12-2013, 07:39 AM   #21
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Originally Posted by k-moe View Post
Straight water freezes at altitude. It gets freaking cold above 10,000 feet.
And alcohol works better than water for evaporative charge cooling. Alcohol also has a significantly higher effective octane number than gasoline. So, it's really more than just an antifreeze.
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Old 06-13-2013, 06:18 AM   #22
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Do I see some proponents for ethanol in gasoline here?

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Old 06-16-2013, 08:38 PM   #23
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ethanol raises octane (or at least has the same effect) but the gasoline is likely at a lower pre-ethanol octane so that the finished product is the same. On the other hand, ethanol slightly leans the mixture which can have an adverse effect on detonation if not accounted for.

There are lots of folks in the forced induction auto world who run water, water/methanol, straight alky, or even e85 injection on top of their normal efi for charge cooling. Shooting e85, not as a primary fuel, but as a charge cooler, works exceptionally well from what I've seen.

Ethanol as rammed down our throats in every gas pump? Not a fan of that.
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Old 06-17-2013, 06:00 AM   #24
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I figured there was a rub. Still impressed with the speedway bikes that ran straight methanol (?) on ice in an enclosed arena. Slowly, heat after heat, the fog of combustion filled the whole place with an aura of bluish gray haze. It is a wonder we didn't all die on the road home, but what a fond olfactory recollection.

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