Re: Spark Plug Heat Range
 

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

Re: Spark Plug Heat Range
 

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

Re: Spark Plug Heat Range
 

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

Re: Spark Plug Heat Range
 

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

Re: Spark Plug Heat Range
 

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

Re: Spark Plug Heat Range
 

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.

Re: Spark Plug Heat Range
 

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?

Re: Spark Plug Heat Range
 

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?

Re: Spark Plug Heat Range
 

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 :thumbsup:

Re: Spark Plug Heat Range
 

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.