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Old 11-03-2019, 03:39 PM   #21
F.M.
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Default Re: Mysterious hole in valve chamber?

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It would all go to the center and rear main then to oil return pipe on outside engine. Another question might be where would all the oil go on a long down hill run if the jagged hole was too low.
What would happen if the Engine did not have that pipe ??
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Old 02-23-2020, 02:32 PM   #22
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Default Re: Mysterious hole in valve chamber?

In cold weather with thick oil and no warmup time , the oil would try to fill the entire valve cavity, starving the rods?
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Old 02-23-2020, 02:50 PM   #23
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Default Re: Mysterious hole in valve chamber?

The elevation of the "return pipe" was changed in May 1930 (p. 342) - the same time that the height was changed on the front hole in the block.

The corresponding difference between heights (1/4"?) remains the same (compensation for engine slant) but later positioning of the returns (plural) is lower - "To reduce oil consumption" ostensibly in oil thrown up and onto the valve stems.

Somewhere, in one of the magazines, the "oil control dam" is discussed, and the author made a plastic valve chamber cover - so the oil height could be seen and the effectiveness of either drain port ascertained. IIRC the conclusion of the article proved out Ford's rationale about reduced oil consumption. He also had some comments about the Model B with no oil pipe - and the internal passage for oil.

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Old 02-23-2020, 03:21 PM   #24
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Default Re: Mysterious hole in valve chamber?

How about no oil return pipe.


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Old 02-23-2020, 03:29 PM   #25
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Default Re: Mysterious hole in valve chamber?

Russian influence.
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Old 02-23-2020, 03:48 PM   #26
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Default Re: Mysterious hole in valve chamber?

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Russian influence.

Nope, see Vince's site. http://www.fordgarage.com/pages/ABva...rvarieties.htm
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Old 02-23-2020, 05:23 PM   #27
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Default Re: Mysterious hole in valve chamber?

Huh.
A rare bird.
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Old 02-24-2020, 02:21 AM   #28
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Default Re: Mysterious hole in valve chamber?

The oil pump will pump more than enough oil. If it’s too low a hole, how did the engine survive the first few months of service?
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Old 02-24-2020, 07:25 AM   #29
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Default Re: Mysterious hole in valve chamber?

Keep in mind that the oil doesn't just calmly flow around in the engine but is a splash system that turns the inside into an oil mist filled area. A hot fog of oily vapor flows through the chambers and a hole like that would allow the mist too flow into those areas. That is why on old engines the outside around the breather pipe is coated with an oily mess.
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Old 02-24-2020, 07:08 PM   #30
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Default Re: Mysterious hole in valve chamber?

Check the hight of the hole against the dam where the valve tapet is. There was a dam where that hole is that let oil flow to the timing gear, however it became popular in the 70's to smash the dam out with a hammer to allow more oil flow to the timing gears. While most peolpe that did this didn't have any problems, there was a side effect. You see sith that dam smashed the oil didn't get high enough in the valve chamber to allow the desired flow to the rear valves, as it had to over come all the seperate dams within the valve chamber.
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