higher boost plugs and bp7efs crosses to...
Thread Starter
Joined: Nov 2001
Posts: 3,184
Likes: 701
From: Chandler, AZ
higher boost plugs and bp7efs crosses to... I don't feel comfortable pushing the TR6 spark plugs farther than the usual 14 psi so I am looking for another heat range cooler and maybe getting it out of the cylinder a bit with a more recessed porcelain plug. There are some places that say the NGK BP7EFS plug crosses to an Autolite AR103 but then others say that the Autolite AR103 cross to an NGK TR6. What does it really cross to? Is the AR103 considered a cooler plug than the TR6? I have heard that the NGK BP7EFS is more recessed and doesn't stick in as far into the cylinder so it sounds like it might be the one that I am after anyways. Any opinions on either the AR103 or the BP7EFS?
Thread Starter
Joined: Nov 2001
Posts: 3,184
Likes: 701
From: Chandler, AZ
I thought about just going to the R5724-8 but am told that it really affects driveability and I do drive this thing on the street a lot so I figured that the BP7EFS would be a happy medium. Does the R5724-8 have the same length porcelain as the BP7EFS and is just a step colder?
Thread Starter
Joined: Nov 2001
Posts: 3,184
Likes: 701
From: Chandler, AZ
Those are helpful threads thanks. I think I will probably search around for the BP7EFS as it seems to work well with people up to 20 psi and I won't be running more than that for sure.
Also I have a B8EFS sitting here but can't find anything about it online. It looks like a tapered seat no gasket with fully recessed porcelain in an 8 heat range. I wonder if this is considered NGK's racing style plug compared to the R5724-8 which isn't fully recessed?
Also I have a B8EFS sitting here but can't find anything about it online. It looks like a tapered seat no gasket with fully recessed porcelain in an 8 heat range. I wonder if this is considered NGK's racing style plug compared to the R5724-8 which isn't fully recessed?
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I found this very helpful as well...
http://www.ngk.com/glossaryImage.asp?imgID=194
http://www.ngk.com/glossaryImage.asp?imgID=195
downloadable .pdf of the same...
http://www.ngksparkplugs.com/docs/product_list.pdf
http://www.ngk.com/glossaryImage.asp?imgID=194
http://www.ngk.com/glossaryImage.asp?imgID=195
downloadable .pdf of the same...
http://www.ngksparkplugs.com/docs/product_list.pdf
Last edited by Superado; Oct 10, 2007 at 12:32 PM.
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Verdad Gallardo Thread Starter
Joined: Nov 2001
Posts: 3,184
Likes: 701
From: Chandler, AZ
I have also noticed that some of the colder NGK plugs are non-resistor. I always thought it was a no no to be running non-resistor type plugs with factory PCM?
What heads are you running? Many people forget to get different plugs when they go to aftermarket castings. I look them up over on sparkplugs.com. Most of the aftermarket heads are .750 reach and gasket vs socket.
Teching In
Joined: May 2005
Posts: 16
Likes: 0
From: Los Angeles, cali
I love my BP7EFS. I had TR6s and they had a lot of damage to the electrode over time. I haven't had any problems with driveability or build up and I am not running that much power. I am not going to push them above 16psi anyways.
I have also noticed that some of the colder NGK plugs are non-resistor. I always thought it was a no no to be running non-resistor type plugs with factory PCM?
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
Resistor plugs are indeed used on modern cars, to help with electrical interference issues. It would not be advisable to use non-resistor plugs, as apparently voltage spikes can occur, which could damage sensitive electrical components.
FWIW, I tried some TR6 plugs and some NGK PFR7B gasketed platinums into a stock head a while back, and the difference in protrusion into the cylinder, is negligable.
Ive been using the NGK Platinums ( more usually found in imports ) for over a year, with no real issues at all, apart from when Ive caused damage through poor tuning.
I have my new Trickflow heads still sitting with some old plugs in it. I'll get a pic later of the TR6 vs PFR7B gasketed later, but again protrusion into the cylinder is virtually the same.
FWIW, I tried some TR6 plugs and some NGK PFR7B gasketed platinums into a stock head a while back, and the difference in protrusion into the cylinder, is negligable.
Ive been using the NGK Platinums ( more usually found in imports ) for over a year, with no real issues at all, apart from when Ive caused damage through poor tuning.
I have my new Trickflow heads still sitting with some old plugs in it. I'll get a pic later of the TR6 vs PFR7B gasketed later, but again protrusion into the cylinder is virtually the same.
9 Second Club
Joined: Nov 2003
Posts: 13,616
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From: Norn Iron
Some of the pics wont really be relevant....But the B8EFS mentioned above, will likely be exactly the same as this BCR8ES
Id do more, but thats all I could get my hands on easily. Nowhere local to me carries tapered seat plugs. They arent really used here in the UK on any cars.
The TR6 is not longer, its just the way it was sitting in the pics.
TR6 installed in my Trickflow heads.
BCR8ES installed in same head
PFR7B NGK Double Platinum Ive been using for past 2 years
BKR8IEX Iridium...perhaps found in some Mitsi Evo's
When you see the electrode of the plug protruding well into the chamber, depending on where it ends up when installed...it does make me wonder, Is it worth indexing the plugs ?
Maybe not from a power point of view, but from perhaps shielding the electrode from melting a little ?
I also found some plug pics online, of a Champion C59HCX, which had a shortened electrode.
Im not generally a fan of Champion plugs though
http://www.sparkplugssource.com/shop...px?itemid=7802
But I know some NGK racing plugs use a similar setup, as apparently it makes the electrode stronger, and less inclined to falling off or breaking. Some NGK 7434-8 Iridium racing plugs a friend uses, actually has a straight ( welded at an angle ) electrode, for this very reason. Its much stronger that way.
Id do more, but thats all I could get my hands on easily. Nowhere local to me carries tapered seat plugs. They arent really used here in the UK on any cars.
The TR6 is not longer, its just the way it was sitting in the pics.
TR6 installed in my Trickflow heads.
BCR8ES installed in same head
PFR7B NGK Double Platinum Ive been using for past 2 years
BKR8IEX Iridium...perhaps found in some Mitsi Evo's
When you see the electrode of the plug protruding well into the chamber, depending on where it ends up when installed...it does make me wonder, Is it worth indexing the plugs ?
Maybe not from a power point of view, but from perhaps shielding the electrode from melting a little ?
I also found some plug pics online, of a Champion C59HCX, which had a shortened electrode.
Im not generally a fan of Champion plugs though
http://www.sparkplugssource.com/shop...px?itemid=7802
But I know some NGK racing plugs use a similar setup, as apparently it makes the electrode stronger, and less inclined to falling off or breaking. Some NGK 7434-8 Iridium racing plugs a friend uses, actually has a straight ( welded at an angle ) electrode, for this very reason. Its much stronger that way.
Last edited by stevieturbo; Nov 17, 2007 at 11:31 AM.
