Spark Plug Heat Range

[flyin ryan]

Originally Posted by Pete

Dom,you sure you have 41-630 or 41-603.

Our cars came with FR2LS (replaced by 41-602) the NGK is FR5.

The only one colder is FR1LS NGK 6962/BKR6E

The 41-603 is NGK FR4.

Pete

if you can't get FR5, the plug i use is NGK BKR5EIX, stock no: 6341.

[jonszr1]

ryan do you think that would be a good plug for a fully ported car? what would you suggest gap wise .you have seen so much in developing motors ,it would be really neat if you shared your thought s . thankyou for any insights you share

[Pete]

Originally Posted by flyin ryan

if you can't get FR5, the plug i use is NGK BKR5EIX, stock no: 6341.

Thanks Ryan
I use AC Delco 41-602 gap @.035.
I have tried different gaps and have found .035 works best for stock ignition system.
I don't think there is much HP to be had in our LT5's from spark plugs, if anyone has experienced any differance (more power) i would love to hear about it.
I know plugs make a differance on race motors.

Pete

[jonszr1]

pete i have a set of those e3s in my black car.getting about 1.5 mpg better on a steady cruize. i ahve 1 150 stretch that i just put it on cruize . if i am getting better fuel milage ,plugs only diff wcould that transfer into a little more power. are those acs colder than the ngk? thanx for any insight

[Pete]

Originally Posted by jonszr1

pete i have a set of those e3s in my black car.getting about 1.5 mpg better on a steady cruize. i ahve 1 150 stretch that i just put it on cruize . if i am getting better fuel milage ,plugs only diff wcould that transfer into a little more power. are those acs colder than the ngk? thanx for any insight

I think it might be more efficient at the rpm you set your cruise at,it does not mean you make more power at peak.

I don't think there is much power if any to be seen on the dyno from our LT5's from just spark plugs.
I'm always willing to hear peoples results.

My Z will be going on the Dyno in a few days i'll try this on the dyno if some one can tell me which plugs are best for more power NGK or Denso.

Pete

[flyin ryan]

Originally Posted by jonszr1

ryan do you think that would be a good plug for a fully ported car? what would you suggest gap wise .you have seen so much in developing motors ,it would be really neat if you shared your thought s . thankyou for any insights you share

oh...i would go a touch colder, one heat range, that's all. porting is one thing but compression & cams ( cam timing ) are another & i'm assuming you haven't messed with that? plug gap wise i'd stay around .035" to .040". nothing to be had there, except the more gap you have the more it taxes the entire electrical system, wires, coils etc.

[XfireZ51]

Originally Posted by flyin ryan

oh...i would go a touch colder, one heat range, that's all. porting is one thing but compression & cams ( cam timing ) are another & i'm assuming you haven't messed with that? plug gap wise i'd stay around .035" to .040". nothing to be had there, except the more gap you have the more it taxes the entire electrical system, wires, coils etc.

FR,

That's what I am planning of doing is go a heat range colder. What would be the equivalent of a 41-601 or 41-600?

[jonszr1]

ryan, thanks a bunch . i have been doing it all wrong have been running ngks at the strip with 50 thou gap . well off to the store for the one step colder and close up the gaps one last ?what type of plug do you like to run or would run when taking a zr1 to the strip. thankyou so much also what are your thoughts on the E-3 plugs . snake oil or maybe good stuff?

[jonszr1]

pete thanx for the input . guess sometimes i think i find the genei in a bottle , i should know better , give me something good to think about though . let us know what you find out thanx ps have you been to the strip with the 41o yet. it would be neat to hear that you got the 10.99 run

[XfireZ51]

Originally Posted by Pete

I think it might be more efficient at the rpm you set your cruise at,it does not mean you make more power at peak.

I don't think there is much power if any to be seen on the dyno from our LT5's from just spark plugs.
I'm always willing to hear peoples results.

My Z will be going on the Dyno in a few days i'll try this on the dyno if some one can tell me which plugs are best for more power NGK or Denso.
Pete

Pete,

I think there are a number of articles that suggest there is. Based on what I've read and the kind of power your motor is putting out, you would benefit from going 1 or 2 steps colder. Be interesting to look at your current plugs. Maybe with a colder plug you could be a bit more aggressive with timing.
I think I may try the BKR6E which is supposed to be the equivalent of the FR1LS.