torynich 4 Report post ID: #1 Posted August 15, 2020 Can someone explain the real world difference in engine operation using the different heat range spark plugs. How and when would you know which heat range your particular engine is wanting? Share this post Link to post Share on other sites
jonbill 101 Report post ID: #2 Posted August 15, 2020 real world, if you put a bpr8 in a stock Z engine it will foul badly, because combustion isn't hot enough to get the plug hot enough to self clean.if you put a bpr6 is a high compression tuned engine, the tip of the plug will melt because combustion is too hot.the right plug for the engine is one that doesn't foul and doesn't melt. 2 Share this post Link to post Share on other sites
Zed Head 2,203 Report post ID: #3 Posted August 15, 2020 4 hours ago, torynich said: How and when would you know which heat range your particular engine is wanting? AS jonbill describes, it's not what your engine wants but what will survive and stay clean in the engine. The engine will run exactly the same until the plug fouls or burns up. Share this post Link to post Share on other sites
Captain Obvious 2,369 Report post ID: #4 Posted August 16, 2020 So it sounds to me like the answer to the question is "Use the coldest plug you can that stays clean." Would that be accurate? Share this post Link to post Share on other sites
jonbill 101 Report post ID: #5 Posted August 16, 2020 So it sounds to me like the answer to the question is "Use the coldest plug you can that stays clean." Would that be accurate?yes, or the hottest plug you can that doesn't melt. Share this post Link to post Share on other sites
AZDatsun 81 Report post ID: #6 Posted August 16, 2020 Or the medium plug that’s just right Sent from my iPhone using Tapatalk Share this post Link to post Share on other sites
Captain Obvious 2,369 Report post ID: #7 Posted August 16, 2020 Got it! Share this post Link to post Share on other sites
torynich 4 Report post ID: #8 Posted August 16, 2020 Thanks everyone ? Share this post Link to post Share on other sites
AZDatsun 81 Report post ID: #9 Posted August 16, 2020 Kinda reminds me of Goldilocks and the three bears.. This porridge is too hot!" she exclaimed.So, she tasted the porridge from the second bowl."This porridge is too cold," she said.So, she tasted the last bowl of porridge."Ahhh, this porridge is just right," she said happily and she ate it all up.Sent from my iPhone using Tapatalk 1 Share this post Link to post Share on other sites
Zed Head 2,203 Report post ID: #10 Posted August 16, 2020 Then she went over to the three little pigs house, blew it down, and ate grandma. I remember those stories... Share this post Link to post Share on other sites