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loops
 Post subject: ngk spark plug
PostPosted: Wed Aug 04, 2010 1:41 pm 
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4 BBL ''Hyper-Pak''
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are we sure that there is no interference with this long plug?
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Aggressive Ted
 Post subject:
PostPosted: Wed Aug 04, 2010 1:55 pm 
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Supercharged
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Joined: Mon Jan 15, 2007 5:05 pm
Posts: 3767
Location: Black Diamond, WA
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Not sure which NGK's your referring to.....

I use the NGK UR4GP/#2869 spark plugs in my 78 peanut plug head with no problems. Click on the red link below my name for pictures of the plugs after 55,000 plus miles.

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Aggressive Ted

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74 Swinger, 9.5 comp 254/.435 lift cam, 904, ram air, electric fans, 2.5" HP2 & FM70 ex, 1920 Holley#56jet, 2.76 8 3/4 Sure-Grip, 26" tires, 25+MPG
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Shaker223
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PostPosted: Wed Aug 04, 2010 4:11 pm 
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Location: The Hand
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I use R5672A-10. no issues.

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Joshie225
 Post subject: Re: ngk spark plug
PostPosted: Wed Aug 04, 2010 5:08 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
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are we sure that there is no interference with this long plug?
Dozens of people with 225s have had zero problems with spark plug to piston interference with the extended tip NGK plugs.

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loops
 Post subject: ngkzfr5n
PostPosted: Wed Aug 04, 2010 5:56 pm 
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I am looking at a NGK zfr5n plug for my 73 225. Are we sure there is no interference? My parts guy is calling me nuts!!!!!!!!!!!!!!
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ceej
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PostPosted: Wed Aug 04, 2010 6:03 pm 
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Joined: Mon Mar 31, 2003 1:04 pm
Posts: 7416
Location: Oregon
Car Model: 2023 Eichman Digger?
As long as you aren't running zero deck it shouldn't be a problem.

Is your engine modified? Stock the pistons will be down the hole .140 to .180"

Lots of room. Gobs.

The ZFR5N works great up to 8.5 or 9:1. Beyond that, it isn't a clearance issue, but a heat range issue. With 10.7:1 I run ZFR6-FIX-11 Iridiums, though they are not extended reach.
As your compression exceeds 9.5:1 go colder. :D

CJ

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loops
 Post subject: thanks
PostPosted: Wed Aug 04, 2010 6:25 pm 
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AS ALWAYS........thanks to everyone!
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Joshie225
 Post subject: Re: ngkzfr5n
PostPosted: Wed Aug 04, 2010 6:26 pm 
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Supercharged
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Joined: Thu Jan 27, 2005 8:32 pm
Posts: 7834
Location: Portland-ish
Car Model: Fiat 500e
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I am looking at a NGK zfr5n plug for my 73 225. Are we sure there is no interference? My parts guy is calling me nuts!!!!!!!!!!!!!!
Has your parts guy ever torn down a 225?

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Joshua
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BUCKET 636
 Post subject: Re: ngkzfr5n
PostPosted: Wed Aug 04, 2010 9:16 pm 
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EFI Slant 6

Joined: Thu Jun 24, 2010 12:30 pm
Posts: 304
Location: GYMPIE,QLD,AUSTRALIA
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Quote:
I am looking at a NGK zfr5n plug for my 73 225. Are we sure there is no interference? My parts guy is calling me nuts!!!!!!!!!!!!!!
I just put them in my 225 a few weeks ago and no problems.

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