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105 / 114 X 4

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BC Mike C

12-20-2002 14:32:52

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Finally got a compression guage that I can use. $12.99 at Princess auto. Ran the tractor for a minute checked all four cylanders / 105 - squirted oil in the holes / 114 - number three was down maybe a pound from the rest. Book says normal is 108 at 2000 feet 92.7 minimum. We are at about 1890 feet above sea level. So I suppose I can keep using Herb for a while yet. Was hoping to get another 30 years out of him and then I will be 86. BC Mike C

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BS@ElmaNY

12-20-2002 21:28:25

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Re: 105 / 114 X 4 in reply to BC Mike C, 12-20-2002 14:32:52

I'm not sure what manual you're reading that states an elevation in relation to cylinder pressure. If your compression gauge reads zero at start (that is, at atmospheric pressure before you take any readings), then you are reading "gauge pressure." This is usually written as units of "psig".

Gauge pressure is the same regardless of elevation or barometric pressure. Gauge pressure is always zero when exposed to atmosphere, and is zero at all atmospheres. This is because the gauge uses atmospheric pressure as the differential to what you are measuring. A tire pressure gauge reads "gauge pressure" as it reads zero when just sitting on your bench.

If a gauge has a reading just sitting on your bench, then it's reads "actual pressure." Actual pressure is atmospheric pressure (14.7 psi at sea level) plus gauge pressure. This is usually written as units of "psia".

I hope this makes sense. It's hard to explain.

Bri

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BS says Ah Ha, you're right

12-22-2002 06:29:48

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Re: Re: 105 / 114 X 4 in reply to BS@ElmaNY, 12-20-2002 21:28:25

Sometimes you have to think things through. You're right... elevation (& therefore atmospheric pressure) affects compression tests. I just had to think through the formulas. It's always best to start with the basics... PV=nRT. Assuming n, R and T are constant (which isn't really so with temp increase due to adiabatic compression) you get P1V1=P2V2 (those are subscripts). BUT (big but), P is ACTUAL (or, as some people prefer absolute) pressure. That means you have to consider ambient pressure (corrected barometric pressure... elevation dependent).

Bottom line, I didn't think it through, and I was wrong. (You can baffle 'em with BS... but only sometimes, I guess).

Bri

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BC Mike C

12-21-2002 14:07:04

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Re: Re: 105 / 114 X 4 in reply to BS@ElmaNY, 12-20-2002 21:28:25

Bri, I have an 8N Ford Tractor Advanced Service Training Program book. It is designed to help train dealer service personnel. I just quoted from page one of the book. In the back of the book under Engine Analysis Specifications it gives the compression at sea level, and in 1000 Ft. increments up to 10000 Ft. And it gives the minimum pressure. Sea level 115 Lbs. and 86.8, at 2000 Ft. 108 and 92.7. So I'm happy with the 105 reading but I probably should have run it a bit longer to warm up. Will check it again in the summer. Regards BC mike C

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Glenn Ayers

12-21-2002 04:08:33

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Re: Re: 105 / 114 X 4 in reply to BS@ElmaNY, 12-20-2002 21:28:25

If the atmospheric air that the cylinder is sucking in is thinner (higher elevation) ... then resulting compression psi will be lower.

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