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Author
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Topic: Spark Plugs
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SG236
Gearhead Posts: 359
From: Jasper, TN, USA
Registered: Dec 2000
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posted 03-14-2001 11:50 AM
   
A couple months ago it was suggest for my combo 351-C stroker that I use the Autolite AR133 plug. Now the engine currently has an autolite 24 which several of the posters on this board was too hot a plug. I just pulled out those AR133's last night and they are 1/4 inch shorter than the 24's. Need some help here. Is the AR133's gonna work ok in the race engine? I would also like to know the cross on a 24 hot plug to a cold plug.All suggestions welcome!
thanks,
Russ Hood
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-14-2001 01:20 PM
Where are they shorter Russ? The electrode or the threads? The AR 133 is not a "power tip" plug so it is not extended.  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
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SG236
Gearhead Posts: 359
From: Jasper, TN, USA
Registered: Dec 2000
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posted 03-14-2001 03:00 PM
Alex, Both the electrode and threads. Have you had any success with this type of plug?
Thanks,
Russ Hood
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-14-2001 07:17 PM
Yes Russ, BIG TIME!  AR-32's in MM and AR-92's in Tony's car. We leave the gap at the factory .024 per Autolite engineer/friend Don Wards insistance. I'll do a cross refferance. ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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SG236
Gearhead Posts: 359
From: Jasper, TN, USA
Registered: Dec 2000
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posted 03-14-2001 08:25 PM
Thanks Alex, I'm going to make the first pass with the 24's and then try the AR133's to compare notes. Anything you can tell me would be great!
Russ Hood
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SteveLaRiviere
Administrator Posts: 32961
From: Saco, Maine
Registered: May 99
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posted 03-14-2001 08:27 PM
.024"? Really?  ------------------
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Loc
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
'97 Probe GTS 2.5L Disposable Commuter
"Live Right! Keep your driveway all Ford!"
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-14-2001 11:00 PM
Yes Steve .024 gap. They are side gapped plugs. The "AR" stands for Autolite Racing. Russ, the Autolite # 24 is a medium range plug. The Motorcraft equivilant is ASF32C which is a stock Boss 351 or 302 plug (heaat range). The AR-133 is NOT a power (extended) tip, therefore shorter than the #24. Alex------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
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Rustang1
Gearhead Posts: 110
From:
Registered: Nov 2000
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posted 03-15-2001 12:44 PM
Nobody believes me!! (I'm refering to an earlier post of mine regarding the autolite sidegapped plugs) I talked to the autolite guy too, and he told me the same thing on the plug gap. I first ran them last summer, mainly because the standard style plugs hit my piston tops. I had the gaps at around .040 and had a bad miss. Called the guy at Autolite and he said set 'em .024-.026, and never go more than .028" (as I recall) even with the best ignition. He explained that the large gap is not needed because the spark is not shrouded from the chamber by the ground strap with these plugs. ------------------
1968 Mustang,Clevor,C4
1969 Torino 351C 4spd
1978 F150 460 C6
1978 F150 351W C6
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-15-2001 01:00 PM
I beleive you Rustang! ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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MrXerox
Gearhead Posts: 322
From: Oklahoma City, Oklahoma
Registered: Nov 2000
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posted 03-15-2001 10:30 PM
What is the formula to figure out which plugs you should use in a particular engine? I have a 351C with 4BBL quench heads, 850DP, Xcellerator intake, solid roller cam 244 @ .050 .623 lift and an auto trans with 3500 stall. Should I use the same plug as Dave? Thanks...
Sean.
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-15-2001 11:08 PM
Flat top pistons use AF-22 Motorcrafts. Pop up pistons use AF-12 Motorcrafts. Via Alex formula.  ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
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MrXerox
Gearhead Posts: 322
From: Oklahoma City, Oklahoma
Registered: Nov 2000
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posted 03-16-2001 09:53 AM
What does the Alex formula compute the proper gap for these to be at for street/strip use?
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-16-2001 01:15 PM
What ignition system do you have Sean? Give me all of the details, distributor, box, coil, wires, etc. Thanks ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
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MrXerox
Gearhead Posts: 322
From: Oklahoma City, Oklahoma
Registered: Nov 2000
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posted 03-16-2001 04:05 PM
Thanks Alex, I have a MSD 6AL box an MSD billet distributor mechanical advance all in by 2500 with timing control and a MSD blaster coil feeding my new Crane 8.5mm sleved Quikfire trick set of wires I got for $50.00 (Thanks for the sale tip Steve!)[This message has been edited by MrXerox (edited 03-16-2001).]
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-16-2001 04:12 PM
.035 is my recomendation with AF-32 or AF-22 plugs Sean. ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
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Ryan Wilke
Gearhead Posts: 1450
From: Stanton, Michigan 49707
Registered: Oct 2000
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posted 03-16-2001 04:54 PM
Alex, do me, do me next! What plugs and gap do you recommend for...Mallory Unilite distributor, Mallory Hyfire IVc CD box #692, Mallory ProMaster coil #29625, initial @ 14 deg and full in @ 35 deg @ 2500 rpms. Plug wires are Accel 8.8 RFI spiral core. Current plugs are AutoLite #45 set at 040 gap. SBF 306", 351W D0OE heads w/1.94-1.60 valves, pop-up pistons,Ultradyne solid-lifter, dur 252/260 @050, 586/608 lift, 106 LS. 028" cold lash, 110 TORCO, 4-spd, 4.56 spool with 9" slicks. Thanks! Ryan [This message has been edited by Ryan Wilke (edited 03-18-2001).]
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SG236
Gearhead Posts: 359
From: Jasper, TN, USA
Registered: Dec 2000
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posted 03-23-2001 05:40 PM
OK Alex I'm open to suggestions on the correct/best plug: 351-C Stoker
compcams .648 lift, I think the duration is .270
strip dominator
heads are 2.19/1.76 MSD 7AL-2
MSD Ultra Coil
MSD Plug Wires (racing)
MSD two-step Leave the line at 5500 and shift at 7200.
1.76 glide and 4.88 (soon to be 5.67 rear gear) Thanks
Russ Hood
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-29-2001 01:04 AM
Ryan, BF-22 Motorcraft (#33 Autolite) gapped at .035 MAX! Russ, I need to know the compression ratio and deck height. I'll try to be back on again sometime tomorrow night (Friday). ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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brockjoe
Gearhead Posts: 961
From: Sioux City, Iowa
Registered: Oct 99
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posted 03-29-2001 07:40 AM
are these recomended for a daily driver?
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SG236
Gearhead Posts: 359
From: Jasper, TN, USA
Registered: Dec 2000
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posted 03-29-2001 11:39 PM
Maybe it will clear up soon in Memphis Alex.Comp ratio is 14:1 and I'll have to find out about deck height. I know the block was decked but don't remember how much. I'll try to call t'morrow. This thing is killing me! Have you got any passes in yet?
Thanks,
Russ Hood
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Moneymaker
Administrator Posts: 19686
From: Lyons, IL, USA
Registered: May 99
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posted 03-31-2001 12:15 AM
Joe, these are recomendations for the BEST possible performance. You take it from there where you would want to apply it. Russ I would like to see you run an AF-901 Motorcraft based on the compression and assuming a "0" deck. We got to make some passes yesterday. See Eric's post above. ------------------
Alex Denysenko Co-Administrator and Moderator NHRA/IHRA/SRA member
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link
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