Spark plug heat ranges

[Douglas Friedberg]

Has anyone done research on spark plugs for the 5.3 engine in the respects of choosing a plug one heat range hotter doesn’t matter who’s plug
Currently using RT53x and ngk doesn’t offer a range hotter and auto lite doesn’t either. Exotic metals are not important copper will be fine

 

[Douglas Friedberg]

well i did alot of research on this plug and i even left emails to major plug manufactures and got very little to no help with this , so i dug in. Iam looking into the 17.5mm reach plug vers 18 mm reach,,more options and its only a mear .001 shorter. I am going to buy the champion plug RS15LYC equal to the TR4 which is one reach hotter. Need to look at the ign. timing and learn from you guys how to add more timing to ythe system or fool it some how, so that would be my next asking question on how to kick up the timoing in these things. Anybody making a add on predialing typr system to play with timing ?????

The plug requirments are tapered seat , 18mm reach 17.5mm reach is .001 shorter .708 plug gay .040, 14 mm threads, with a 18mm (5/8) hex drive nut .
Thanks Doug

 

[S33k3r]

From researching across multiple forums, our engines seem to only like OEM or ngk sparkplugs, so you may be setting yourself up for some trouble. I have not witnessed this firsthand, however.

 

[exp500]

Grab a Full NGK Catalog. The heat ranges are in there, but you have to decipher the number you want based on plug reach/type/heat range. Compare against stock plug. Likely to be a 55 number.
Champions above not recommended by me.
Goodluck!

 

[Douglas Friedberg]

Do they still send out catolages. I sent them a email their reply was no such animal. I have 60 years of experence reading and altering plugs, all plugs are good there’s no bad manufacture plug but the bum **** comes from choosing wrong plug and champion you have to go alittle hotter and ign system is another key tool to know what you have. All these plugs work find to 11,000 rpms using even old points ign system. It’s about the plug gap as well. 100,000 volts sure is better then 15,000 volts. Individual coils sure are nice.

 

[Douglas Friedberg]

55 is stock heat range. Ngk is backwards from everyone else with number system. Lower number hotter. Where as others are hotter going up. Denso the same too.
Looking threw the interchange numbers which a lot has changed from old days so I have to catch up alittle. Champion there saying is RS 12YC there replacement. Which I know from exp. Is to cold yet so Iam going after Rs14 or 15 y c. I’ll keep
yeas informed

 

[exp500]

Have you seen this?-

Spark Plugs Catalogue | NGK

Have you specd the TR4 and TR3 numbers?

Lastly, I'm curious because ya really want to run the coldest plug it will run with........Too much advance eats plugs too.

 

[Douglas Friedberg]

Well there are many diff reasons for choosing hotter plugs or a better heat range for the changing combustion temp and contamination. High
Mileage motors get more oil contamination and as well as gasolines. The OEM always chooses the best all around when the engine is new. And better sealed. Colder plugs are more prone to fouling and deposit build ups. A lot of it is about the driver knowing there vehicle. There is a ton of info on reading plugs and how to do it. You want the
Plug as hot as you can get it under full load without getting into detonation. A 60,000 motor compared to a 250,000 mile motor are two diff animals. Oil viscosity is another problem people must learn. OEM recommends grade for new motors and low milage
Motors as things get worn the specs change. 5-30 is to me doesnt belong in a high milage motor.

 

[Kapitein]

Reviving a necro-thread, but could anyone advise what I should purchase for one heat-range cooler than OEM?

My truck runs on Propane and a grade cooler is recommended, but im having a hard time finding out the OEM heat range.

Thanks!

 

[S33k3r]

Can you please give details on your rig? With those you are way more likely to get an answer. Even a plebe like me might be able to get you an answer!

Also, have you tried calling the parts houses to see what they suggest?