What spark plugs should I be using?
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What spark plugs should I be using?

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    Senior Member holorinhal's Avatar
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    Default What spark plugs should I be using?

    Need some advice on what spark plug i should use In My new engine.
    The engine is a 489 cubic inch BBC, aluminum heads, Full roller, duel carb Tr, Standard HEI ignition. Cr is very close to 11:1
    Just wanted to know if the standard plugs for the BBC is good or is there a certain brand and or type that is better suited for performance application? ....Thanks ...Hal

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    Some guy obnoxious001's Avatar
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    Hal

    Guys have differing opinions on spark plugs. I like Autolite or NGK.

    I would guess, but not assume that your "aluminum heads" need a 14mm .750" reach gasket seat plug. You need to verify that before you just screw a set in, got any paperwork that came with them?

    You might find that local parts stores carry the Autolite,, my advice might be 2 steps colder than "stock". I have a set of 3923's in an engine I have sitting here ready to go to dyno.

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    In your other post you say the heads are AFR 305's. From AFR website:
    Champion C59C Autolite 3932 Spark Plug Starting Range

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    gn7
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    Quote Originally Posted by muskwa View Post
    In your other post you say the heads are AFR 305's. From AFR website:
    Champion C59C Autolite 3932 Spark Plug Starting Range
    Actually, that was "Flat Fan" on the Forced Induction forum



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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by obnoxious001 View Post
    Hal

    Guys have differing opinions on spark plugs. I like Autolite or NGK.

    I would guess, but not assume that your "aluminum heads" need a 14mm .750" reach gasket seat plug. You need to verify that before you just screw a set in, got any paperwork that came with them?

    You might find that local parts stores carry the Autolite,, my advice might be 2 steps colder than "stock". I have a set of 3923's in an engine I have sitting here ready to go to dyno.
    Barry, AFR specs call for a flat seat with gasket plug with a .750 reach with a 5/8" hex head. AFR recomends a Champion C59C,or Autolite 3932....H

    I'm not here for a long time, I'm just here for a good time!
    If your not on the edge.......your taking up too much room......Drive it like you stole it!

    73 KONA Restoration http://www.performanceboats.com//showthread.php?t=10678
    '81 Spectra 20 Facelift http://www.performanceboats.com/user...-facelift.html

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    Some guy obnoxious001's Avatar
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    Quote Originally Posted by holorinhal View Post
    Barry, AFR specs call for a flat seat with gasket plug with a .750 reach with a 5/8" hex head. AFR recomends a Champion C59C,or Autolite 3932....H
    Those are what they call for with an NA engine?

    As I said, you will find varying preferences and opinions.

    Autolite crosses the C59C to a AR3933, which also shows the same as an NGK -9 heat range(that's what I would put in a blown or turbo "race" application. I ran NGK 9's in my Schiada with a turbocharged 505 cu in engine,, 15 lbs boost.

    The AR3932 correspond to an NGK -10, colder than I would normally select

    The 3923 I mentioned is supposed to be similar or the same as an NGK -6. It is a resistor plug, but cheap and easy to get from Autozone or perhaps others.

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    Default Hei?

    Hal ,how did you get a HEI dist to work with a TR? never seen one fit. Pat

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    Senior Member holorinhal's Avatar
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    Quote Originally Posted by Wicked Performance Boats View Post
    Hal ,how did you get a HEI dist to work with a TR? never seen one fit. Pat
    OOOOOPS!
    Ok so I guess I am looking for another distributor/ ignition system

    Well Pat, I have just got the engine home and Havent actually got to the point of putting the distributor in yet. My builder thought that it would fit, i have heard of them fitting,but I guess that is with some modifications to the intake and distributor,which I do not want to do. I allready have two HEIs and was just hopping to save alitle money to get on the water.
    I just want a simple economical ignition that delivers good timming and a powerful spark, any suggestions?
    I have been looking at the MSD marine distributor Prt#83606 or the pro billet#8360.
    Well I guess It is back to the drawing board. Does the bleeding ever stop!....Hal

    I'm not here for a long time, I'm just here for a good time!
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    '81 Spectra 20 Facelift http://www.performanceboats.com/user...-facelift.html

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    I like to put an NGK 8 heat range in everything to start. Maybe a 9 if it races. But that is just me. I find them easier to read.

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    gn7
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    Quote Originally Posted by Fiat48 View Post
    I like to put an NGK 8 heat range in everything to start. Maybe a 9 if it races. But that is just me. I find them easier to read.
    Fiat, you posted this once before, quite awhile back. And I thought to myself, this is probably an alky thing. But I tried it, and your right. It is, for me at least, easier get a better read on an 8. In fact I have switched to 8s for racing and have had zero issues. I think part of it is that my heads run pretty damn cold and pull the heat out of the plugs more than I thought. Which is something alot of people don't give enough thought to. If the head is cool enough, the 8 will run no different than 9 in a warmer head. The heat range is nothing more than the plugs ability to reject heat. If the head it is rejecting to is cool, then the warmer plug is just fine. It has a lot less to do with combustion heat than people think.



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    Last edited by gn7; 08-25-2010 at 07:40 PM.

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    I did gas before alky. Champions in the old days and read the burned cad. Then Champion tried the one heat range fits all attitude and no selection of heat range. Then discovered NGK. Hell of a lot of guys know how to read the Autolytes but I have a lot of comparison cad burn readings and pyro readings with NGK so I just stay there.
    Never had an issue with the NGK's. The only reason we replace one is we will throw a new one in just to get a cad reading.
    I just try to keep it all simple.
    By the way. A 7 heat range will color so quick it will scare you into that maybe you are lean.....when you're not. A 10 heat range...never could color one and I KNOW....it was hungry.
    Last edited by Fiat48; 08-25-2010 at 08:26 PM.

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    NGK 8 heat range

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    Quote Originally Posted by obnoxious001 View Post
    Those are what they call for with an NA engine?.

    The AR3932 correspond to an NGK -10, colder than I wo
    uld normally select

    The 3923 I mentioned is supposed to be similar or the same as an NGK -6. It is a resistor plug, but cheap and easy to get from Autozone or perhaps others.

    I'm being to lazy to look it up.....AR3932 vs an Autolite 51 how many ranges colder is the AR 3932 ?

    In the other thread I listed the Champion race plug I tried one trip to the river. They fouled/glazed over in a few miles on the river with an MSD and strong coil they stopped working:
    From the other thread.

    I was cleaning out some drawers in the garage today and came across a Champion C59CX recessed plug I tried to run one weekend at the river many moons ago. Killer super duty race plugs the damn things fouled going up river. They kind of glazed over.


    http://www.amazon.com/Champion-296-C.../dp/B000CIS1IS

    We had run them on the dyno in either '98 or 2000 and the worked just fine. I get to the river and I'm headed up river and the boat starts getting lazy as if the timing is retarding and it finally just quites in the middle of the river. WTF we had gone 3-4 miles. I pull out the nasa tool box we carry and start looking for the cause and 4 of the plugs look weird so I change them out to the Autolite 51's I had in the boat. This took abit to get to the plugs being the issue after checkin fuel the dizzy and maybe something else.

    We take off and about 1/2 mile later the it losses power again I check the other 4 plugs and damn they're glazed over too. I throw in 4 more Autolites and away we went. Those damn Champions just didn't like something we were doing, 3,800 rpm cruise or the fuel. /they just checked out. So I've run the Autolite 51's ever since.

    I was a bit surprised that the MSD and the hot coil wasn't enough to keep them firing.




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    Last edited by Sleeper CP; 08-26-2010 at 08:04 AM.

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