The Ford Barn

56yblock · 10-21-2017, 05:21 AM

what spark plugs do you put for 272 ci yblock ?

Crankster · 10-21-2017, 05:27 AM

Lots of folks like Autolite 45 though may be a little hot for extended freeway use.

56yblock · 10-21-2017, 06:22 AM

what do you think the 11 RF 18 YC champion

streetdreams · 10-21-2017, 11:18 AM

Bsf, brf, bf -82

Crankster · 10-21-2017, 12:13 PM

Quote:

Originally Posted by 56yblock

what do you think the 11 RF 18 YC champion

Those are two different plug heat ranges. Unfortunately modern manufacture Champion plugs rightly or wrongly do not have the reputation they once had. Autolite 45 or BF42 are well suited to these engines, and I've heard good things about NGK plugs.

In most cases the "normal" heat range plug will give good service in a stock engine, unless one is running extended highway use in the summer. Keep in mind a common tuning error is to install a hotter plug when the issue is actually incorrect ignition timing and/or carburetor tuning - jetting, power valve etc. Plug fouling for example. Modern fuels don't color the way leaded gasoline did, either on the plugs or exhaust. They can look somewhat lean and still running very rich. So it's a cut and try method. Make sure you have a good HOT spark ignition, timing curve squared away, and carburetor tuned well before deciding you need a different heat range.

Ole Don · 10-21-2017, 12:23 PM

Sponsored Links (Register now to hide all advertisements)

I had the best results by asking the kid at O'Reilley's for spark plugs to fit a 1960 F100 with a 292, and buy NKG. In my 312, the NKG brand outlasted Champion, and performed better while doing it.

56yblock · 10-21-2017, 12:38 PM

i have the autolite 46,i want just change for the best

Crankster · 10-21-2017, 01:22 PM

http://www.ford-y-block.com/tuneup.htm

46 are considered "too hot". 45s are good, but a little hot for extended highway use. There is no Autolite 44, and BF32 are pretty much unobtanium (at $2 a plug) now.

Don, what is the NGK #?

paul2748 · 10-21-2017, 08:41 PM

I have used 46's in my two Y's. That seems to be the recommended plug. Plugs always looked good with a nice tan color on the ceramic.

miker98038 · 10-21-2017, 11:18 PM

I’ve run NKG’s in everything since at least the mid 70’s. They just seem to work and last. The only exception is my daily drivers with the 50,000 mile plugs. I live with the OEM’s on them.

56yblock · 10-22-2017, 02:09 AM

what's motorcraft do you use?

LOWRIDER · 10-22-2017, 07:01 AM

I'll go along with BF82, BRF82 and BSF82. That's what Ford went with when they switched to Motorcraft.

56yblock · 10-22-2017, 08:33 AM

what's the reference with NGK

Crankster · 10-22-2017, 09:09 AM

NGK AP5FS or APR5FS

The R signifies a resistor plug

TedEaton · 10-22-2017, 07:07 PM

I use the Autolite #46's in my '55 Customline with a 272. Car now has a quarter million miles plus on it with the last 90-100K miles being with the 46's. I try to change them out at 40-45K mile intervals and they always look good. The car has electronic ignition which explains the spark plug life. Ted Eaton.

Crankster · 10-22-2017, 07:50 PM

Thanks, Ted. So you don't hold with the info provided at the link I posted above. Good to know.

TedEaton · 10-23-2017, 07:20 AM

The compression ratio is a big player when selecting the heat range for the spark plugs. The lower the compression ratio, then the need for a hotter spark plug. The 272 with 7½-8:1 compression ratio is happy with the 46 Autolites. As the cubic inches goes up, so does the compression ratio when all else is equal. For the 9-9½:1 292's, I'll use the Autolite 45 spark plugs. Ted Eaton.

10-21-2017, 05:21 AM	#1
56yblock Senior Member Join Date: Nov 2016 Posts: 270	spark plugs what spark plugs do you put for 272 ci yblock ?

10-21-2017, 05:27 AM	#2
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: spark plugs Lots of folks like Autolite 45 though may be a little hot for extended freeway use.

10-21-2017, 06:22 AM	#3
56yblock Senior Member Join Date: Nov 2016 Posts: 270	Re: spark plugs what do you think the 11 RF 18 YC champion

10-21-2017, 12:23 PM	#6
Ole Don Senior Member Join Date: May 2010 Location: St. Michael, Minnesota Posts: 1,713	Re: spark plugs Sponsored Links (Register now to hide all advertisements) I had the best results by asking the kid at O'Reilley's for spark plugs to fit a 1960 F100 with a 292, and buy NKG. In my 312, the NKG brand outlasted Champion, and performed better while doing it.

10-21-2017, 12:38 PM	#7
56yblock Senior Member Join Date: Nov 2016 Posts: 270	Re: spark plugs i have the autolite 46,i want just change for the best

10-21-2017, 11:18 AM	#4
streetdreams Senior Member Join Date: Dec 2010 Location: Howell, Michigan, USA, The Peoples Slightly Overspent Demodependancy of Michigan Posts: 638	Re: spark plugs Bsf, brf, bf -82

10-21-2017, 01:22 PM	#8
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: spark plugs http://www.ford-y-block.com/tuneup.htm 46 are considered "too hot". 45s are good, but a little hot for extended highway use. There is no Autolite 44, and BF32 are pretty much unobtanium (at $2 a plug) now. Don, what is the NGK #?

10-21-2017, 08:41 PM	#9
paul2748 Senior Member Join Date: May 2010 Location: Midland Park, NJ Posts: 3,979	Re: spark plugs I have used 46's in my two Y's. That seems to be the recommended plug. Plugs always looked good with a nice tan color on the ceramic. __________________ 48 Ford Conv 56 Tbird 54 Ford Victoria Last edited by paul2748; 10-22-2017 at 06:46 PM.

10-21-2017, 11:18 PM	#10
miker98038 Senior Member Join Date: Mar 2013 Location: Kent, WA. Tucson, AZ Posts: 1,397	Re: spark plugs I’ve run NKG’s in everything since at least the mid 70’s. They just seem to work and last. The only exception is my daily drivers with the 50,000 mile plugs. I live with the OEM’s on them.

10-22-2017, 02:09 AM	#11
56yblock Senior Member Join Date: Nov 2016 Posts: 270	Re: spark plugs what's motorcraft do you use?

10-22-2017, 07:01 AM	#12
LOWRIDER Senior Member Join Date: May 2010 Location: Kingman Az. 86409 Posts: 419	Re: spark plugs I'll go along with BF82, BRF82 and BSF82. That's what Ford went with when they switched to Motorcraft. __________________ Dan Kingman Az. 86409

10-22-2017, 08:33 AM	#13
56yblock Senior Member Join Date: Nov 2016 Posts: 270	Re: spark plugs what's the reference with NGK

10-22-2017, 09:09 AM	#14
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: spark plugs NGK AP5FS or APR5FS The R signifies a resistor plug

10-22-2017, 07:07 PM	#15
TedEaton Senior Member Join Date: Nov 2012 Location: Central Texas Posts: 155	Re: spark plugs I use the Autolite #46's in my '55 Customline with a 272. Car now has a quarter million miles plus on it with the last 90-100K miles being with the 46's. I try to change them out at 40-45K mile intervals and they always look good. The car has electronic ignition which explains the spark plug life. Ted Eaton.

10-22-2017, 07:50 PM	#16
Crankster Senior Member Join Date: Oct 2017 Posts: 563	Re: spark plugs Thanks, Ted. So you don't hold with the info provided at the link I posted above. Good to know.

10-23-2017, 07:20 AM	#17
TedEaton Senior Member Join Date: Nov 2012 Location: Central Texas Posts: 155	Re: spark plugs The compression ratio is a big player when selecting the heat range for the spark plugs. The lower the compression ratio, then the need for a hotter spark plug. The 272 with 7½-8:1 compression ratio is happy with the 46 Autolites. As the cubic inches goes up, so does the compression ratio when all else is equal. For the 9-9½:1 292's, I'll use the Autolite 45 spark plugs. Ted Eaton.