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Re: Spark Plugs
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Forum Ambassador
 
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Packard's use of short reach (3/8") plugs ended with the end of the flathead era (1954). The AutoLite website gives these choices for your 1955 Clipper:
Non-resistor: 437 Resistor, copper-core: 65 Platinum: AP65 PS - 3/4 inch reach. "Reach" is defined in my vintage AC catalog as the distance from the gasket seat to the end of the shell.
Posted on: 2011/9/7 8:18
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Re: Spark Plugs
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Home away from home
 
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NC CLipper:
What are u calling 'long' and 'short reach' plugs????? Do u mean the length of the THREADed portion of the plug????? What are the numbers cast into the cylinder head on the center exhaust port very near the exh manifold??? What was the number on the plugs that AAP sold u???
Posted on: 2011/9/7 9:07
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VAPOR LOCK demystified: See paragraph SEVEN of PMCC documentaion as listed in post #11 of the following thread:f
https://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=7245 |
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Re: Spark Plugs
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Home away from home
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I was talking about the length of the threads. I went back and looked everything up and the lady there was wrong. I'll just return them and get the right ones. Thanks for all your help.
Posted on: 2011/9/7 10:15
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Re: Spark Plugs
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Home away from home
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Packard changed the design of their cylinder heads on the 1955 V-8s. The early V-8s used machined combustion chambers. The later engines had heads with cast combustion chambers and long-reach spark plugs. Others here will have the specifics.
(o{}o)
Posted on: 2011/9/7 11:42
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We move toward
And make happen What occupies our mind... (W. Scherer) |
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Re: Spark Plugs
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Forum Ambassador
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The transition vehicle numbers for change from machined to cast done were 5522-4481, 5542-4597, and 5547-2596. Machined dome chambers used 7/16 reach, and cast done used 3/4 inch reach. The cylinder head casting number changed from 440689 to 440854, later also including "CD" as a suffix. Champion plugs changed from H-10 to N-8.
The Service Counselor on this topic has more information on other aspects of the changeover.
Posted on: 2011/9/7 12:16
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Re: Spark Plugs
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Forum Ambassador
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my very early block and heads had H10s in it. one of the heads was a 1/55 date.
Posted on: 2011/9/7 13:12
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1937 Packard 138-CD Deluxe Touring Limousine
Maroon/Black 1090-1021 [url=https://packardinfo.com/xoops/html/modules/registry/View.php?ID=232]1955 Packard |
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Re: Spark Plugs
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Forum Ambassador
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Owen, do you have a typo in your response? 55 Packards used Champion H10 plugs. 56 used Champion N18.
N18s are almost impossible to find.
Posted on: 2011/9/7 13:34
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Re: Spark Plugs
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Forum Ambassador
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Randy, I was quoting directly from the Service Counselor.
Looking at my 1962 spark plug chart, both Champion N8 and N18 are listed, the N18 being the slightly hotter plug, otherwise identical. The N18 is listed as equivalent to AC 46XL and the N8 to the AC 45XL. There is no AutoLite equivalent given for the N18 but AGR51 is given as equivalent to the N8.
Posted on: 2011/9/7 13:40
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Re: Spark Plugs
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Forum Ambassador
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I was going by the parts book which says the N8 (or the H10) is for the 5540 and the N18 for all 56th. I always thought the N18 had a much longer reach (3/4 threaded portion) than the H10 (7/16). Today is a good day - I learned something.
Posted on: 2011/9/7 14:20
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