So the wrong spark plug was in my engine

StoneColdStang · December 21st, 2011, 10:16 PM

I changed my spark plugs and I see i had Autolites 765 in them. Now I cross reference on Autolite site and these are not even close to being the correct plug for 2001 3.8....

I'm pissed now.

person i bought the car from did not know what he was doing

Can anything bad come from using wrong plugs??

Tang Stang · December 22nd, 2011, 08:54 AM

As I said in your other thread, 765's match the specs of the recommended 605's. The only difference is thread length. Both plugs will work just fine in a 99-04 V6.

dgt_mustang · December 22nd, 2011, 09:25 AM

Yeah man, your boned, new engine needed, dont bother with new ones. jk, no harm shall fall upon your car. just get the right ones, thread lenghts may be different between a 605 and 765 but their such things as heat range and such that get factored in, they would not have made so many different plugs if you could thrown any old plug in there and be find LONG TERM.

Tang Stang · December 22nd, 2011, 09:31 AM

The 605's and 765's are both heat range 5. Like I said, identical specs besides thread length, which isn't an issue in this application, as both will work.

StoneColdStang · December 22nd, 2011, 03:40 PM

Thanks, makes me feel better

mustangmike! · December 22nd, 2011, 05:35 PM

Nice to know about the thread length, got to looking into 4.2 and 3.8 plugs and the thread length was quite different ! was hoping to not get the long one and the piston hit it lol

Tang Stang · December 22nd, 2011, 05:47 PM

Originally Posted by mustangmike!

Nice to know about the thread length, got to looking into 4.2 and 3.8 plugs and the thread length was quite different ! was hoping to not get the long one and the piston hit it lol

Plug reach and thread length are two different things here. Thread length doesn't necessarily correlate with plug reach.

mustangmike! · December 22nd, 2011, 06:36 PM

I cant remember if that was an issue or not, I was just looking at some different plugs for the 4.2 and had one of my auto lites in my hand comparing

shipwreck_98 · December 23rd, 2011, 11:43 PM

Originally Posted by Tang Stang

Plug reach and thread length are two different things here. Thread length doesn't necessarily correlate with plug reach.

What?
The reach of spark plug is the length of metal threads at end of plug. The correct plug reach very important to proper engine operation.

Tang Stang · December 24th, 2011, 02:09 PM

Originally Posted by shipwreck_98

What?
The reach of spark plug is the length of metal threads at end of plug. The correct plug reach very important to proper engine operation.

The "reach" of a spark plug is the distance from the seat to the end of the shell. This includes both the threaded and unthreaded portions of the shell. The thread length is not necessarily correlated to the reach. Yes, reach is very important.

shipwreck_98 · December 24th, 2011, 03:15 PM

The thread length is "correlated" to the reach. If the thread length is too long, the spark plug lay into the cylinder too much and run the risk of hitting the head of the piston.

Tang Stang · December 24th, 2011, 03:59 PM

Apparently I'm talking to a wall here.

A full thread plug can have the same reach as a partial thread plug, while having two different thread lengths. This is a common occurrence in the Mod-motor world.

shipwreck_98 · December 24th, 2011, 11:03 PM

6ER THEN I 8ER! · December 24th, 2011, 11:26 PM

Originally Posted by Tang Stang

Apparently I'm talking to a wall here. A full thread plug can have the same reach as a partial thread plug, while having two different thread lengths. This is a common occurrence in the Mod-motor world.

you do know that a 3.8 and 3.9 is a push rod motor right

Tang Stang · December 25th, 2011, 12:43 AM

Originally Posted by 6ER THEN I 8ER!

you do know that a 3.8 and 3.9 is a push rod motor right

And that has what to do with anything here? I only mentioned the modular engine as an example in which thread length and reach are often non-exclusive of one another. You do know that the sky is blue right?

6ER THEN I 8ER! · December 25th, 2011, 12:50 AM

Originally Posted by Tang Stang

And that has what to do with anything here? I only mentioned the modular engine as an example in which thread length and reach are often non-exclusive of one another. You do know that the sky is blue right?

don't get smart....you said it was a common occurence in mod motors while talking in a push rod section...you should word things better lol

Tang Stang · December 25th, 2011, 01:02 AM

Originally Posted by 6ER THEN I 8ER!

don't get smart....you said it was a common occurence in mod motors while talking in a push rod section...you should word things better lol

My posts are going to be as short and to the point as possible for a bit. Typing with two broken fingers isn't particularly fun. As I said, I was using the modular engine as an example, it doesn't have a bearing on the topic at hand.

6ER THEN I 8ER! · December 25th, 2011, 01:05 AM

Originally Posted by Tang Stang

My posts are going to be as short and to the point as possible for a bit. Typing with two broken fingers isn't particularly fun. As I said, I was using the modular engine as an example, it doesn't have a bearing on the topic at hand.

then try not to use something that has no bearing on the topic at had as an example...keeps from confusion

well have a good night...merry christmas

Skargon · December 25th, 2011, 02:44 PM

But anyways.. Same thing happened to me. Wrong plugs.
I Put in the right ones.

No Biggie.

StoneColdStang · December 25th, 2011, 11:33 PM

Originally Posted by Skargon

But anyways.. Same thing happened to me. Wrong plugs.
I Put in the right ones.

No Biggie.

+1

December 21st, 2011, 10:16 PM	#1
StoneColdStang Regular Join Date: Dec 2011 Location: Columbus, Ohio Posts: 122 iTrader: 0 reviews	So the wrong spark plug was in my engine I changed my spark plugs and I see i had Autolites 765 in them. Now I cross reference on Autolite site and these are not even close to being the correct plug for 2001 3.8.... I'm pissed now. person i bought the car from did not know what he was doing Can anything bad come from using wrong plugs??

December 22nd, 2011, 08:54 AM	#2
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	As I said in your other thread, 765's match the specs of the recommended 605's. The only difference is thread length. Both plugs will work just fine in a 99-04 V6. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

December 22nd, 2011, 09:31 AM	#4
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	The 605's and 765's are both heat range 5. Like I said, identical specs besides thread length, which isn't an issue in this application, as both will work. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch

December 22nd, 2011, 05:35 PM	#6
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	Nice to know about the thread length, got to looking into 4.2 and 3.8 plugs and the thread length was quite different ! was hoping to not get the long one and the piston hit it lol __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

December 22nd, 2011, 06:36 PM	#8
mustangmike! I Post Entirely Way Too Much 2004,1994,1967 14.37 @ 96 Join Date: Aug 2008 Location: Texas Posts: 6,018 iTrader: 1 reviews	I cant remember if that was an issue or not, I was just looking at some different plugs for the 4.2 and had one of my auto lites in my hand comparing __________________ 227whp N/A V6 Now w/ 8th Mile 8s ! How To Jmod Your Late Model 4R70W

December 22nd, 2011, 03:40 PM	#5
StoneColdStang Regular Join Date: Dec 2011 Location: Columbus, Ohio Posts: 122 iTrader: 0 reviews	Thanks, makes me feel better

December 24th, 2011, 03:15 PM	#11
shipwreck_98 Newbie 2001 Mustang 3.8 Join Date: Nov 2009 Location: Virginia Beach Posts: 27 iTrader: 0 reviews	The thread length is "correlated" to the reach. If the thread length is too long, the spark plug lay into the cylinder too much and run the risk of hitting the head of the piston. __________________

December 24th, 2011, 03:59 PM	#12
Tang Stang Hardcore Enthusiast 2004 Mustang GT Join Date: Sep 2010 Location: Imperial, MO Posts: 1,961 iTrader: 2 reviews	Apparently I'm talking to a wall here. A full thread plug can have the same reach as a partial thread plug, while having two different thread lengths. This is a common occurrence in the Mod-motor world. __________________ Rod @ AzzKicker Cars 2004 Ford Mustang GT-The Driver-BBK CAI, PP TB & Inlet, Steeda UD's, SLP LM1, & 3.73's. 1990 Mercury Cougar XR7-The Meth Addict-5.0L DOHC Stroker w/2.1L KB SC. 1995 Ford F150-Mud Toy-5.0L, 4x4, 33's, & Warn 8274 Winch Last edited by Tang Stang; December 24th, 2011 at 04:12 PM.

December 24th, 2011, 11:03 PM	#13
shipwreck_98 Newbie 2001 Mustang 3.8 Join Date: Nov 2009 Location: Virginia Beach Posts: 27 iTrader: 0 reviews	__________________

December 25th, 2011, 02:44 PM	#19
Skargon Skar Gone 1998 Mustang V6 17.27@76.66 Join Date: Jul 2011 Location: Dayton Ohio Posts: 1,646 iTrader: 0 reviews	But anyways.. Same thing happened to me. Wrong plugs. I Put in the right ones. No Biggie. __________________ 1998 5 Speed, CAI, Exhaust, Rear Seat Delete. Last edited by mcqueen; December 25th, 2011 at 11:34 PM.

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