difference in R44T and R44TS spark plugs - The 1947 - Present Chevrolet & GMC Truck Message Board Network

Custom 68 · 06-23-2004, 03:54 PM

Hey all like the title says? I was trying to get my newly rebuilt Fuel injected (TPI) 327 running. I had the usual unknowns of the new engine plus the fact I bought a used TPI. I then proceeded to cut the wires out I didnt need and spice some length to the 30 or so I did need. So you can see I was a bit leary about the new setup. Anyway a had a bad air intake temp sensor so it was running RICH it went down hill from there and couldnt get it started. I checked and replaced the necessay items. Once I finally checked the spark plugs for spark (had timing light on so there was fire to the plug) it had a very weak spark. I had just cleaned them (they were new prior to the rich run) to no avail. I grabbed my old ones sitting from the tear down a year ago and stuck them in. It now runs great!
Anyway my old ones were the R44TS the new ones were R44T. I was running HEI before and of course am now.
Could that have been part of the problem?
Thanks
DAve

chaptr2 · 06-23-2004, 04:27 PM

I believe R44 is a colder plug and the TS is "tapered seat" that means they don't use the washers or "peanut plug heads". By the part number given they both should be AC Delco spark plugs. So were you trying to put on spark plugs that have washers on them (should have taken a 13/16" socket to put them in)? If the plugs look different then that is your problem, if not, I'm not really sure what you had wrong.

JimKshortstep4x4 · 06-23-2004, 07:56 PM

AC has a code system for their spark plugs. The difference between the two plugs is that one has an extended tip and the other does not.

R44TS

R= Resistor
4= 14 MM
4= Heat range
T= Tapered seat
S= Extended tip

The R44T is the same plug except it does not have the extended tip.

For further information, check this site out.

Jim

http://www.acdelco.com/html/pi_plugs_ident.htm

**kwmech** · 06-23-2004, 09:08 PM

Quote:

Originally Posted by JimKshortstep4x4

AC has a code system for their spark plugs. The difference between the two plugs is that one has an extended tip and the other does not.

R44TS

R= Resistor
4= 14 MM
4= Heat range
T= Tapered seat
S= Extended tip

The R44T is the same plug except it does not have the extended tip.

For further information, check this site out.

Jim

http://www.acdelco.com/html/pi_plugs_ident.htm

And the X is a wide gap so a TSX would be tapered, extended tip with a .060 gap.

06-23-2004, 03:54 PM	#1
Custom 68 Registered User Join Date: Nov 2001 Location: Springfield, MO Posts: 2,930	difference in R44T and R44TS spark plugs Hey all like the title says? I was trying to get my newly rebuilt Fuel injected (TPI) 327 running. I had the usual unknowns of the new engine plus the fact I bought a used TPI. I then proceeded to cut the wires out I didnt need and spice some length to the 30 or so I did need. So you can see I was a bit leary about the new setup. Anyway a had a bad air intake temp sensor so it was running RICH it went down hill from there and couldnt get it started. I checked and replaced the necessay items. Once I finally checked the spark plugs for spark (had timing light on so there was fire to the plug) it had a very weak spark. I had just cleaned them (they were new prior to the rich run) to no avail. I grabbed my old ones sitting from the tear down a year ago and stuck them in. It now runs great! Anyway my old ones were the R44TS the new ones were R44T. I was running HEI before and of course am now. Could that have been part of the problem? Thanks DAve __________________ Dave 1968 Custom Chevy with turbo charged 5.3 gen III 4l80e swap 1967-71 GMC 3/4 ton long step 4x4 (not sure what year exactly?) "A good friend will bail you out of jail...but a true friend will be sitting next to you saying "that was frekin awesome". "If it doesn't fit force it...If it breaks then it needed to be replaced anyway!"

06-23-2004, 04:27 PM	#2
chaptr2 Registered User Join Date: Mar 2000 Location: Olalla, WA Posts: 705	I believe R44 is a colder plug and the TS is "tapered seat" that means they don't use the washers or "peanut plug heads". By the part number given they both should be AC Delco spark plugs. So were you trying to put on spark plugs that have washers on them (should have taken a 13/16" socket to put them in)? If the plugs look different then that is your problem, if not, I'm not really sure what you had wrong. __________________ This is only my opinion and it is subject to change. 70 GMC Short box stepside Blown 388 Stroker 72 K/5 Blazer 350/SM465/205

06-23-2004, 07:56 PM	#3
JimKshortstep4x4 Senior Member Join Date: Jul 2001 Location: Muskegon,MI,USA Posts: 6,026	AC has a code system for their spark plugs. The difference between the two plugs is that one has an extended tip and the other does not. R44TS R= Resistor 4= 14 MM 4= Heat range T= Tapered seat S= Extended tip The R44T is the same plug except it does not have the extended tip. For further information, check this site out. Jim http://www.acdelco.com/html/pi_plugs_ident.htm



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