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Ford Truck Club Forum > FORD BRONCO | BRONCO II > 1980-1986 Ford Bronco



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  #1  
Old October 31st, 2011, 01:51 AM
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Default Spark Plugs 5.8L

Ok here's the deal, I've got a brand new set of Bosch Platinums sitting on the parts shelf here at the house, the bronco could use some new plugs, I ordered these plugs for my 79 but I parted it out and they never saw the engine.

I know that the 400 and 351w use 2 different heat ranges(one is a 24 in Autolite and the other a 25), the Bosch for the 400 is HR9BPX(what I have) and the 351w is HR8BPX, if I put these plugs in the 351w what exactly will happen?? I haven't ever messed w/ these types of things just bought the 351w plugs and figured since I have these I might as well use em.
  #2  
Old October 31st, 2011, 08:30 AM
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use em
you wont burn a hole in the piston top
not sure which ones hotter but with only 1 heat range differance, the only possible thing I could see is that if they are colder than what the 351 likes they may foul out / too hot and you may get pre-igination; but once again at 1 range differance I doubt it
there is a way to tell a differance between a hot & cold plug if you have both; by looking at the thickness of the insulator around the electrode the hotter plug will have a long insulator nose


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  #3  
Old October 31st, 2011, 11:24 AM
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Another vote for just do it.
If they are the hotter of the two plugs it may help you anyway, with an older engine that burns oil you would want a slightly hotter plug anyway.
Or if you have the timing bumped or anything of that sort.
  #4  
Old October 31st, 2011, 11:55 AM
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You can't do the ignition timing bump on these 351w like you can on the 302, they don't like it, I'll put em in and see how it does gotta run to town sometime this week.
  #5  
Old October 31st, 2011, 02:07 PM
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Really? It's so easy with the 300 and 302.
Hotter coil, bigger gap on the plugs and some decent plug wires and you can run up to 16 degrees if you live in the flat lands.
I can only get away with 13 or 14 since I could literally go up a 1000 feet in the mountains here in a minute.
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Old October 31st, 2011, 02:18 PM
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Yeah, the EFI 302's have a cam knock sensor that prevents pre ignition, and the 351w doesn't, a guy on another site did a whole blog review on the "Sixlitre Tune-up" for a 351w, I'll see if I can find it and post it here.
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Old October 31st, 2011, 02:39 PM
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http://fullsizebronco.com/forum/show...ht=timing+bump
I have had it favorited for years.
I wanna know why it is called the six liter tune up though.
  #8  
Old October 31st, 2011, 02:53 PM
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I have no clue, I just know the member Sixlitre came up w/ it or something along those lines.
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Old October 31st, 2011, 02:57 PM
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Check out this:
http://fullsizebronco.com/forum/blog.php?b=625

It's about the tune-up but covering 351w's and why it won't work.
  #10  
Old October 31st, 2011, 04:21 PM
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So they are in there, the initial drive around the neighborhood at 25 MPH didn't show any detonation so for now it's good, I'll check on the highway in the coming week. I know it idles smoother now..


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