what heat range plug - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


DIY Turbo Discussion greddy on a 1.8? homebrew kit?

Reply
 
 
 
LinkBack Thread Tools
Old 05-01-2007, 11:45 PM   #1
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default what heat range plug

what heat range plug is good for a forced induction miata?

also, what heat range is the stock miata plug and should i go 1 or 2 colder?
mxv is offline   Reply With Quote
Old 05-01-2007, 11:58 PM   #2
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

I think everyone and their mother, almost, uses a ngk bkr7e (I think thats the model #, if not its close).
neogenesis2004 is offline   Reply With Quote
Old 05-01-2007, 11:59 PM   #3
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Go to your favorite parts store and get the standard copper $1/ea NGK plug for the miata. No need to go cooler on a street car.
Ben is offline   Reply With Quote
Old 05-02-2007, 12:13 AM   #4
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

I run bkr7e NGK
cjernigan is offline   Reply With Quote
Old 05-02-2007, 12:21 AM   #5
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

thx
mxv is offline   Reply With Quote
Old 05-02-2007, 12:23 AM   #6
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

ngk is showing that it is a v power plug. with the v cut electrode. is that good to use? or do they not accually have that groove?

mxv is offline   Reply With Quote
Old 05-02-2007, 12:25 AM   #7
Senior Member
iTrader: (2)
 
SamS's Avatar
 
Join Date: Jun 2006
Location: Wisconsin
Posts: 1,254
Total Cats: 7
Default

I use BKR7E-11 (11 just means its pre-gapped, 1.1mm i think) and I believe it is also a v-power.
SamS is offline   Reply With Quote
Old 05-02-2007, 12:25 AM   #8
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

they do have a groove
neogenesis2004 is offline   Reply With Quote
Old 05-02-2007, 12:26 AM   #9
Elite Member
iTrader: (12)
 
Join Date: Aug 2006
Location: Central-ish VA
Posts: 4,449
Total Cats: 16
Default

Quote:
Originally Posted by SamS View Post
I use BKR7E-11 (11 just means its pre-gapped, 1.1mm i think) and I believe it is also a v-power.
You dont want to use the 11, its gapped too big. The regular bkr7e is pregapped to .35
neogenesis2004 is offline   Reply With Quote
Old 05-02-2007, 12:29 AM   #10
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I just walked out to the garage to look. Get a package of 4 x NGK BKR6ES-11 stock no 5553. Comes in a silver box, no groove, and is around $4.50.

Get a gap feeler and close them down to .35 or so if you have a miss that only occurs under boost.
Ben is offline   Reply With Quote
Old 05-02-2007, 12:31 AM   #11
Senior Member
iTrader: (2)
 
SamS's Avatar
 
Join Date: Jun 2006
Location: Wisconsin
Posts: 1,254
Total Cats: 7
Default

Quote:
Originally Posted by neogenesis2004 View Post
You dont want to use the 11, its gapped too big. The regular bkr7e is pregapped to .35
Maybe I remembered the number wrong then. They've been in for a year with no issues.
SamS is offline   Reply With Quote
Old 05-02-2007, 12:34 AM   #12
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

I'm not going to say there's anything wrong with going with heat range 7 and a small gap for safety BUT you really want to run a hotter plug and larger gap unless you have a problem doing so. A colder plug is less efficient than a hotter plug. BUT too hot of a plug in the wrong/ignorant hands can lead to big $$ damage.
Ben is offline   Reply With Quote
Old 05-02-2007, 01:52 AM   #13
mxv
Senior Member
Thread Starter
iTrader: (4)
 
Join Date: Oct 2005
Location: South Carolina
Posts: 582
Total Cats: 0
Default

Quote:
Originally Posted by Ben View Post
I just walked out to the garage to look. Get a package of 4 x NGK BKR6ES-11 stock no 5553. Comes in a silver box, no groove, and is around $4.50.

Get a gap feeler and close them down to .35 or so if you have a miss that only occurs under boost.
thats the exact plug and gap i used on the turbo civic. worked great.
mxv is offline   Reply With Quote
Old 05-02-2007, 03:08 AM   #14
Junior Member
 
Join Date: Sep 2006
Posts: 225
Total Cats: -4
Default

That temp range also comes in the NGK Iridium range.
Uncle Arthur is offline   Reply With Quote
Old 05-02-2007, 09:41 AM   #15
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

-11 mean they are pregapped at .044"

BKR7Es are pregapped at .035" (Stock Number 6097)


The stock 1.6 used BKR6E-11 plugs. The 1.8 uses BKR5E-11 plugs. You want to go 1 heat range colder for every 75-100 hp added. So if you have a 1.6 you'll want a heat range 7 with ngk plugs and if you have a 1.8 you can just buy 1.6 plugs.
Braineack is offline   Reply With Quote
Old 05-02-2007, 09:54 AM   #16
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Quote:
Originally Posted by Braineack View Post
You want to go 1 heat range colder for every 75-100 hp added.
Why? Colder plugs just waste power. Unless you have a detonation problem , stick with stock heat range for your street car. Race car, I'd probably go a step down for safety.
Ben is offline   Reply With Quote
Old 05-02-2007, 09:57 AM   #17
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

so they don't burn off the carbon deposits and foul.
Braineack is offline   Reply With Quote
Old 05-02-2007, 09:59 AM   #18
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

no a colder plug is more likely to foul
Ben is offline   Reply With Quote
Old 05-02-2007, 10:12 AM   #19
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,899
Total Cats: 1,792
Default

exactly, that's why im running colder. I'm really doing it for the extra detonation protection as they keep the intake temps every so slightly colder.
Braineack is offline   Reply With Quote
Old 05-02-2007, 10:19 AM   #20
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

Hmm I'm not sure you're with me on this homie.

The hotter plug
hotter cylinder temps
higher cylinder pressure
burn off deposits
more efficient

The colder plug
more likely to foul the plug
more likely to leave deposits on the cyl walls
lower cyl pressure
takes heat from combustion and *delivers it to the cooling system*
less efficient
Ben is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM


Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off



All times are GMT -4. The time now is 08:36 PM.