Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Original specification was 0.035 plus/minus 0.002, and there is no reason to do differently today.
Posted on: 2009/2/6 12:48
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Quite a regular
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Thanks,Do i need to make any other adjustments,use additives,ETC in order to safely run engine on unleaded fuel?? Thanks again!!
Posted on: 2009/2/6 12:53
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Home away from home
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Follow Owens advice. The .040 and wider that is used in modern cars is not due to fuel. The wider gap is due to e-ignition of modern cars because the e-ign throws a much hotter spark.
My personal preference is to gap standard ignition plugs at .028 - ,030 for faster cold weather start up and allows for longer range between regapping the plugs. What spark plugs are u using and what is the number on them?????
Posted on: 2009/2/6 12:54
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Forum Ambassador
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Do i need to make any other adjustments,use additives,ETC in order to safely run engine on unleaded fuel??
0.028-0.030" in fine for flathead engines, but for my taste a bit too narrow a gap for the V8s. As to additives, if you're going to flog the heck out of the car on Interstates, I'd recommend using genuine tetraethyl lead, available from Jack Podell, or at the very least a lead substitute but I sometimes wonder if they're not just another "snake oil" with no benefit. If you're driving is occasional Interstate trips at about the legal speed limits, then I'd say no.
Posted on: 2009/2/6 13:08
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Home away from home
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For a 1955 Packard 352,
Spark plug type = H10 (1955) N18 (1956) Spark plug gap - .035 Points gap - .017 Dwell angle (points) - 31 degrees Firing order - 18436572 Timing 5? BTDC Battery ground and voltage -12 The reason they went to wider spark plug gaps in the 70s and 80s, had a lot to do with trying to fire a thin or lean mixture. They leaned out the carbs as far as they dared, for mileage and pollution control. If you are using electronic ignition you might open the gaps a little but I wouldn't go more than 40 thou. Unless you change the distributor cap, rotor, and plug wires to more modern designs. On the whole it's probably best to stick with the stock settings. If you do not have hardened valve seats, it can't hurt to add some Marvel Mystery Oil, Redex, or other good upper cylinder oil to the gas. But you won't hurt your engine if you don't, provided you don't run it too hard or overheat it. By run it hard I mean cruise over 80MPH for extended periods on a hot day, or tow a house trailer over the Rocky Mountains.
Posted on: 2009/2/6 20:37
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Webmaster
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One correction there. The 1955s were 12+ Ground while the 1956s was 12- Ground.
Posted on: 2009/2/6 23:28
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-BigKev
1954 Packard Clipper Deluxe Touring Sedan -> Registry | Project Blog 1937 Packard 115-C Convertible Coupe -> Registry | Project Blog |
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Quite a regular
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Thank's to all!!!!!!
Posted on: 2009/2/8 9:10
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Forum Ambassador
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The timing on all but the earliest 56 374 engines was:
Timing 10? BTDC
Posted on: 2009/2/8 12:33
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Re: Plug Gap on 352 v8 to compensate for unleaded fuel????
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Home away from home
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There are a couple of other things to consider when selecting spark plugs for these OHV V-8 engines. Should one go with the standard exposure center electrode or a projected electrode (e.g., Y series Champions or S series ACs) spark plug? Also, resistor or non-resistor type? And what about the new platinum plugs with one, two, and more grounds? I would say go with a resistor projected electrode plug along with solid wire, non-resistor, high tension wires. The extra cost for the platinum spark plugs is probably not warranted due to the small amount of miles these cars are usually driven. The projected electrode type plugs will not work on the l-head straight 8s. Just some thoughts ...
Posted on: 2009/2/8 18:57
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