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Re: Lets talk a little more about quench
[Re: 360view]
#483149
10/03/09 12:49 PM
10/03/09 12:49 PM
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Joined: Sep 2007
Posts: 14,889 up yours
Supercuda
About to go away
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About to go away
Joined: Sep 2007
Posts: 14,889
up yours
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Quote:
Good point about piston wall clearance and varying metal expansion ratios.
For factory engines in daily driver vehicles instead of race engines, what about wear with mileage ?
Let's just assume that a new & well assembled engine with attention paid to each cylinder individually will hit at 0.025 at 5500 rpm.
What would be people's guesses as to how much increased head to crown clearance is necessary to avoid hitting at 5500 rpm when the engine ages to, say 50,000 miles ?
100,000 miles?
200,000 miles ?
Related question: does a head gasket compress a wee bit more with additional years and tighten effective quench ... or does it relax instead and increase quench clearance for the worse?
THis is a corollary to my previous post.
Modern factory engines have a number of, well for lack of a better word, tricks in them to resolve these questions.
thinner, moly faced rings, specific cylinder wall finishes, specific piston to wall clearnces, specific ring land specifications, etc. All to run nice tight quench, control excess oil into the combustion chamber, and so on.
Which is why our old school engines are somewhagt expensive to setup right. Heck, today's production line maching is on par with the expensive race shop machine work of not so long ago. Bubba at the local machine and horseshoe shop cannot match it.
They say there are no such thing as a stupid question. They say there is always the exception that proves the rule. Don't be the exception.
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Re: Lets talk a little more about quench
[Re: Intense RT Dan]
#483151
10/03/09 01:18 PM
10/03/09 01:18 PM
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Joined: Nov 2003
Posts: 36,041 Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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I am shooting for .040" and milling each piston top till I get it perfect (in addition to the deck milling) which is why I'm going w floating pins so I can mock it up as many times as I need to till it's right.
live every 24 hour block of time like it's your last day on earth
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Re: Lets talk a little more about quench
[Re: RapidRobert]
#483152
10/03/09 01:34 PM
10/03/09 01:34 PM
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Joined: Sep 2009
Posts: 172 Mooresville, NC
Intense RT Dan
member
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member
Joined: Sep 2009
Posts: 172
Mooresville, NC
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Quote:
I am shooting for .040" and milling each piston top till I get it perfect (in addition to the deck milling) which is why I'm going w floating pins so I can mock it up as many times as I need to till it's right.
That's the way to go.
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