Spark Plug Question
Thread Starter
|
Logistics Pro
Joined: Oct 2002
Posts: 4,489
Likes: 5
From: Valley Center, CA
Spark Plug Question
I have a problem with the intake valve on several cylinders of my 272 Y-block letting oil into the combustion chamber. (compression test is good) The plugs on four of the eight are black and oily. They have not fouled out yet and I intend to try a hotter plug in those cylinders temporarily until I get around to changing the valve guide covers.
My problem is that the plugs I have are Motorcraft BSF 92. Evidently, this is a defunct number. Autozone sold me the equivelent which they say is an Autolite 46. They claim that this is the hottest plug available for my engine.
Has anybody else tried this temporary fix? And do you know of a plug that might do better to burn off the extra oil?
Thanks, Jag
My problem is that the plugs I have are Motorcraft BSF 92. Evidently, this is a defunct number. Autozone sold me the equivelent which they say is an Autolite 46. They claim that this is the hottest plug available for my engine.
Has anybody else tried this temporary fix? And do you know of a plug that might do better to burn off the extra oil?
Thanks, Jag
Mountain Pass
Joined: Feb 2010
Posts: 101
Likes: 14
From: Diboll, Texas
which plug?
Cargo Master
Joined: Sep 2007
Posts: 2,095
Likes: 2
From: Wahpeton ND
I use 46s and suffer the same problom as you. I simply have to pull mine out and clean them every year.
There is a hotter plug. I think its a 50? but cannot remeber for sure. It is significantly hotter then a 46 though.
There is a hotter plug. I think its a 50? but cannot remeber for sure. It is significantly hotter then a 46 though.
Post Fiend
Joined: Sep 2006
Posts: 14,325
Likes: 14
From: Island Southeast Alaska
I have the same engine and same valve guide seal problem. I use Autolite 45 bought at Nappa. Haven't had any foul out in the 1000 miles I have drove since I put them in. Generally the smaller the number the hotter the plug. Remember to hot of a plug can or may burn a hole in a piston if it is run hard.
Postmaster
Joined: Jul 2003
Posts: 2,688
Likes: 4
From: Southern Oregon
Here are some SP numbers out of an '81 Autolite catalogue's heat range chart. Beginning with hottest heat range. First numbers are old IDs followed with the new number system.
BSF92B = 747,47
BTF6B, BRF6B, BF82 = 746,46
BSF42B, BF42B, BTF42B = 745,45
BSF92B = 747,47
BTF6B, BRF6B, BF82 = 746,46
BSF42B, BF42B, BTF42B = 745,45
Thread Starter
|
Logistics Pro
Joined: Oct 2002
Posts: 4,489
Likes: 5
From: Valley Center, CA
Thanks for the help guys, I bought an Autolite 46 and a Champion 14Y. I installed them in the middle two pistons on the driver side and took it out for a ten mile drive. I noticed much more power and when I came back, I pulled the plugs for a comparison. The champion was much cleaner than the autolite. So, I switched them between cylinders to see if the difference is the cylinder or the plug. I'll run it tonight and see what happens.
Jag
Jag
Thread
Thread Starter
Forum
Replies
Last Post
Noob52
1948 - 1956 F1, F100 & Larger F-Series Trucks
3
May 14, 2016 09:42 PM
49willard
1948 - 1956 F1, F100 & Larger F-Series Trucks
4
Nov 7, 2015 07:06 AM
Jag Red 54
Y-Block V8 (239, 272, 292, 312, 317, 341, 368)
8
Aug 31, 2011 04:07 PM
Jag Red 54
1948 - 1956 F1, F100 & Larger F-Series Trucks
43
Oct 15, 2009 08:39 AM
