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Re: Valves & seats
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In the service manual they talk about the angles, 45 and 30, but do not talk about what the seat size/width should be. Maybe they do in a service bulletin somewhere, or maybe they weren't doing 3 angles?
Posted on: Today 14:52
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Re: Valves & seats
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Some Packard valve guides were larger at the upper end than at the lower end. The pressure in the exhaust port can vary considerably under different operating conditions. Shop manuals are available on this website for most year models.
Posted on: Today 14:55
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Re: Valves & seats
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I think they gave a spec ... somewhere. In most cases, the valve seat is considerably narrower than the valve face. The narrow contact tends to prevent debris like carbon from sticking to the valve or seat face and it gives a higher pressure contact than a wider seat would.
Posted on: Today 15:00
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Re: Valves & seats
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If Packard gives a spec on seat face size, I haven't been able to find it. Yes, the seat face should be much less than the valve's face for the reasons you mention. Ideally the seat face should land in the middle of the valve face.
Posted on: Today 15:09
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Re: Valves & seats
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What? They use different materials because they run hotter... It might get too hot for a rubber seal to ever work. Seals themselves depend on surface finish, cylindricity, temperature, and lubricant type; little else.
Posted on: Today 15:25
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1955 400 | Registry | Project Blog
1955 Clipper Deluxe | Registry | Project Blog 1955 Clipper Super Panama | Registry Email (Parts/service inquiries only, please. Post all questions on the forum.) service@ultramatic.info |
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Re: Valves & seats
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Keep in mind that on an overhead valve engine, the seals go on the rocker side opposite the exhaust and intake areas so are not subject to the suction of intake or the heat of exhaust. Unless you have something made of a really durable high-heat resistant material that clamps tightly onto the guide, I think its a big risk to do that kind of re-engineering. It seems a bit of over-thinking a problem that doesn't exist.
Posted on: Today 15:30
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Re: Valves & seats
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Always over-thinking! LOL I often go round and round about why things are done one way and not another. But then 99% of the time things get done on my Cavalier just the way Packard did then.
Posted on: Today 16:27
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