VCCA Home Forums TECHNICAL - GENERAL Mechanical - Engine, Trans, etc What to use that is hotter than R45 AcDelco Plugs

i am using an R45 spark plug. What is the next hotter plug?

The "5" in R 45 determines the heat range.

46 would be hotter, 44 would be colder.

Look at this write up, may help.

http://acdelcotechconnect.com/pdf/imtn_V14I607.pdf

44 and 46 obsolete.

If your car is running "correctly" the 45 will be fine. If it is burning oil, carburetor running too rich, you are over choking it, or letting it idle a lot the plugs wll be a sootty black. This should burn off with some country driving (except for the oil).

She is purring like a kitten. I am having a hard time sealing my push rod cover. So each time I pull it to try and eliminate the mess, I see my plugs with dry carbon except for the two closest to the firewall. I have been wire brushing them and putting them back in. I would imagine I am looking to "fix it 'til I break it". A by-product of too much time on my hands!!!

I was giving examples, as to which way the "hot" and "cold" ranges are determined.

Wisebri,

AC 46 & 46R are abundant on ebay. If you're patient they're pretty inexpensive.

I've been dialing in the jetting on a 420S carb for my '36 PU. Right now it at a 94 main jet and a 70-47 rod with the tip reduced to 0.0445". I'd be glad to send you a photo of what AC46 plugs look like with that jetting and also with 94 & 69-42 jetting in a 1934-35 carb.

Both of those jetting combinations give good power (tested on a long 11% grade near my home), economy and cool running and you may find the plug color interesting.

Thanks. I will look for the 46's. Typically I like to avoid ebay for electrical stuff. I will look.

Just to clarify it would be 46 or R46 on the AC package.

Dave

I do have a radio so probably R46. Sorry I did not get back sooner. More hospital stuff.

"Typically I like to avoid ebay for electrical stuff."

Wise,

Ebay can be a really good source. The impatient pay top dollar but guys who are in no hurry can get some really good deals. I got a couple of sets of AC46 plugs for $1 per plug but I also see them for $75/set of 6.

When I converted my Ford 8N tractor to 12 volt a neighbor gave me a '70 Toyota alternator that has a pulley for a 5/8" wide belt, requiring no belt change. Instead of using the complicated Toyota wiring for a 6-terminal Toyota voltage regulator I discovered that a 2-terminal 1968-69 Mopar regulator would be compatible with the Toyota alternator. There is an ebay seller in Southern California who has an electronic OEM replacement for that voltatge regulator for $13. It works great.

That same setup would make an inexpensive 12 volt alternator conversion on old Chevies also to get bright lights and instant starting.

So there is some good electrical stuff on ebay. It's pretty hard to go wrong with NOS spark plugs.

Ray W