spark plug question - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

240blitz · 02-02-2007, 10:34 AM

i'm building a high comp ka24de and am trying to find out what heat range spark plugs i should get. hotter or colder?

pr0ject TRUENO · 02-02-2007, 11:34 AM

general rule of thumb is whenever you run a higher power output than stock it increases combustion chamber temps, so you'd run a cooler plug.

punxva · 02-02-2007, 06:45 PM

yea run a colder plug man if you are looking to run a different range, try about 3 colder and see how that works out, also try searching what others are running for similar setups

oneleg180 · 02-06-2007, 10:02 AM

Quote:

Originally Posted by punxva

yea run a colder plug man if you are looking to run a different range, try about 3 colder and see how that works out, also try searching what others are running for similar setups

Are you suggesting that he run plugs with a heat range of 8? Whatever you do, be sure to use ONLY NGK.

MadScientist · 02-06-2007, 10:26 AM

Actually you will be perfectly fine running 7.

7s are mostly used for Turbo and High Comp vehicles.

If you are going to push over 400hp with a Turbo or SuperCharger then you would go with 8+.

Peace
Drew

CleanKAKouki · 02-06-2007, 02:30 PM

Quote:

Originally Posted by oneleg180

Are you suggesting that he run plugs with a heat range of 8? Whatever you do, be sure to use ONLY NGK.

i agree, whatever you do, pleae use NGK. i made the mistake of running the cheap napa autolites....never again. NGK is the where its at for imports

teamsprock · 02-06-2007, 02:45 PM

I would start with one heat range colder and see if you have signs of detonation. Colder plugs won't perform as well and will foul quicker if they are too cold. You really only need to go colder to avoid detonation.

02-02-2007, 10:34 AM	#1
240blitz Zilvia Member Join Date: Apr 2006 Location: san diego Posts: 163 Trader Rating: (0) Feedback Score: 0 reviews	spark plug question i'm building a high comp ka24de and am trying to find out what heat range spark plugs i should get. hotter or colder?

02-06-2007, 10:26 AM	#5
MadScientist Zilvia.net Advertiser Join Date: Mar 2003 Location: NOLA Age: 48 Posts: 1,972 Trader Rating: (3) Feedback Score: 3 reviews	Actually you will be perfectly fine running 7. 7s are mostly used for Turbo and High Comp vehicles. If you are going to push over 400hp with a Turbo or SuperCharger then you would go with 8+. Peace Drew __________________ Follow on IG - KoukiTheToolBox

02-02-2007, 11:34 AM	#2
pr0ject TRUENO Zilvia FREAK! Join Date: Jun 2004 Location: san jose CA Posts: 1,012 Trader Rating: (1) Feedback Score: 1 reviews	general rule of thumb is whenever you run a higher power output than stock it increases combustion chamber temps, so you'd run a cooler plug.

02-06-2007, 02:45 PM	#7
teamsprock Zilvia Addict Join Date: Sep 2006 Location: Billings Age: 42 Posts: 636 Trader Rating: (8) Feedback Score: 8 reviews	I would start with one heat range colder and see if you have signs of detonation. Colder plugs won't perform as well and will foul quicker if they are too cold. You really only need to go colder to avoid detonation.