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| ATN: Dan extended nose plug question. https://slantsix.org/forum/viewtopic.php?t=19353 |
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| Author: | Johnny Z [ Fri Aug 25, 2006 11:11 am ] |
| Post subject: | ATN: Dan extended nose plug question. |
Dan, I have seen how you reccomend the NGK ZFR5N and the Autolite 985. I am kind of partial to Autolites.Autolite 66 are what I usually use. Question:Can you explain to me the difference in the plugs,and if this is definitely a switch I should make. Thanks JZ |
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| Author: | SlantSixDan [ Fri Aug 25, 2006 11:40 am ] |
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Here y'go. I like the NGKs better; quality is nicer, tip design is more advanced and the suppressor is of a more modern design. Either the 985 Autolite or the ZFR5N NGK uses a 5/8" hex socket rather than the 13/16" socket you're used to using. |
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| Author: | Johnny Z [ Fri Aug 25, 2006 12:48 pm ] |
| Post subject: | |
Thanks Dan, Read the thread: So I guess what you are saying is that these are a cleaner burning plug? Thanks JZ |
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| Author: | Eric W [ Fri Aug 25, 2006 9:36 pm ] |
| Post subject: | |
The NGK's are a much cleaner burning plug. Mine see use everyday and are in fantastic shape for having over 10K miles on them.....no deposites of any kind. |
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| Author: | rebel_cat68 [ Sat Aug 26, 2006 9:59 am ] |
| Post subject: | |
Should the plug's "washergasket" be cut away on these NGK's too when having plugtubes. They seem to be longer in the picture, so that's why the question. |
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| Author: | SlantSixDan [ Sat Aug 26, 2006 10:33 am ] |
| Post subject: | |
Yes, on a 1963-1974 cylinder head, remove the metal gasket ring. I don't usually cut them off, I grab them with pliers and unscrew them off the plug. |
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| Author: | DusterIdiot [ Sat Aug 26, 2006 10:38 am ] |
| Post subject: | Or maybe.. |
Quote: ZFR5N NGK uses a 5/8" hex socket rather than the 13/16" socket you're used to using.
I notice NGK says the 13/16" hex is coded ZGR-5N...If the peanut plug guys need a longer intrusion into the chamber then the TR-4 would be the long reach plug over the standard taper seat UR-4's the 1975+ head crowd and Chevy crowd uses...if they only made a ZTR-4 then we'd be in good shape, also. -D.Idiot |
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| Author: | Johnny Z [ Sat Aug 26, 2006 10:58 am ] |
| Post subject: | |
Sounds like I will give the NGK-ZFR5N a try. Little fyi: They are also listed as a NGK-3459 Have a good one. JZ |
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| Author: | SlantSixDan [ Sat Aug 26, 2006 11:23 am ] |
| Post subject: | Re: Or maybe.. |
Quote: I notice NGK says the 13/16" hex is coded ZGR-5N...
Interesting -- good sleuthing! Wonder if those are popular enough to be generally available.Quote: If the peanut plug guys need a longer intrusion into the chamber then the TR-4 would be the long reach plug over the standard taper seat UR-4's the 1975+ head crowd and Chevy crowd uses...if they only made a ZTR-4 then we'd be in good shape, also.
No books in front of me at the moment, can't recall what the "Z" designates.
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| Author: | DusterIdiot [ Sun Aug 27, 2006 6:13 pm ] |
| Post subject: | NGK "code"... |
Z=extended "gap" T=Tapered seat 14mm 5/8" hex 17.5 mm reach (I wish we could get the 'T-1' designation then same as above, but .807" reach) R=Resistor 4/5 is the heat range (5 is colder) N="special side electrode" Too bad I don't see them as available in the copy of NGK's catalog...but the TR-4's are.... Just trying to see about getting something for us late model peanut plug guys.... -D.Idiot |
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| Author: | Johnny Z [ Wed Aug 30, 2006 4:14 pm ] |
| Post subject: | |
I got some NGK-ZFR5N's today.I installed them in a spare head I have on the bench along with a Autolite 66.These plus extend quite a bit farther than the shorter plug.I understand this is probably the reason they fire or work better. My question is: Is there any clearance issues with these plugs I should be worried about? I am sure there isn't,just wanted to hear it.  Thanks JZ |
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| Author: | SlantSixDan [ Wed Aug 30, 2006 4:58 pm ] |
| Post subject: | |
No problem, you are "clear" for takeoff. Maybe if you have time, can you shoot a couple comparison pics of the 66 vs. the ZFR5N from the combustion chamber side? That would be a helpful couple of images to have, to convey the difference in how the plug fits/works. Remember, no metal ring gaskets on the plugs with a '63-'74 head! |
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| Author: | Johnny Z [ Wed Aug 30, 2006 5:17 pm ] |
| Post subject: | |
I have been meaning to take some pics of this head with the porting and such that has been done.I am not to good at the picture posting stuff however if someone has a e-mail I can send them the pics for them to post. Ring gaskets have been removed. One other thing:Do we know the heat range for these plugs.Is there a chart for looking up hotter and colder NGK plugs? Thanks again JZ |
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| Author: | SlantSixDan [ Wed Aug 30, 2006 5:39 pm ] |
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Heat range is more or less identical to the 66s you've been using. Heat range charts are in NGK's plug catalogue. |
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| Author: | justinb [ Wed Aug 30, 2006 7:07 pm ] |
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Quote: Remember, no metal ring gaskets on the plugs with a '63-'74 head!
What about 60-62 heads?
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