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  #1  
Old Jul 17th, 02, 09:02 AM
Blue 70 Blue 70 is offline

 
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I replaced the plugs in my car today,it had R43`s in it and i replaced them with R44ts.
The car fired right up but ran rough. When I pulled two of the new plugs the tips of them had been slammed shut. The guy i bought the car from said it had a 355,I`m not sure of the year of the block,stroke,or cam specs.
How do i fined out what lenght of plug to run?
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  #2  
Old Jul 17th, 02, 09:19 AM
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DjD DjD is offline
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Dennis
 
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Compare the old plugs with the new!! I bet you got the wrong kind... Why did you switch to a hotter plug?

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...Dennis
"The '69, the '96 & the club"
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  #3  
Old Jul 17th, 02, 10:05 AM
Blue 70 Blue 70 is offline

 
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The R43`s looked like the gap on them had been closed up also or just not gaped correctly when new.
Should i go back with 43`s?
Thanks!
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  #4  
Old Jul 17th, 02, 10:11 AM
stingr69 stingr69 is offline
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They discontinued the old style R43 and substituted I think R43T or R43S but if you have R43TS I think those might be tapered seat? Anyway, the domes will hit the electrode on many engines from this era with extended tip plugs. I suggest you go for NGK's or some other brand that has less reach. I wish I could remeber more stuff as I remember a similar thread about the discontinuation of the AC plugs spec'd for many of our engines.

-Mark.
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  #5  
Old Jul 17th, 02, 02:09 PM
Turbo_Jet Turbo_Jet is offline
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Here is a link I got from a plug discussion at Team Chevelle, it might help.

Joe
http://www.acdelco.com/html/pi_plugs_ident.htm
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  #6  
Old Jul 17th, 02, 02:53 PM
Blue 70 Blue 70 is offline

 
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Here is what i have found out so far,My car had R43T plugs.When i did the tune-up i installed R44TS plugs(DON`T ASK WHY!!!)
I went to Autozone and the guy told me to go back with a R44T. He said the 43`s are too cool and will create alot of carbon build up.
I installed the R44T`s and everything is back to normal. I think?
Example- R43T,Are short.
R43TS,Are longer.
Thanks for the help!!!!1

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  #7  
Old Jul 18th, 02, 02:06 AM
RickD RickD is offline
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Hmmm. I have a high compression 355 and run the R45S. The R43S was a bit too cold for street driving. The S is an extended tip, the T is a tapered seat . If you have a GM small block, it will not use the tapered seat. You can tell by looking at the spark plug hole base. I would think the tapered seat might let the plug settle deeper but I'm not sure. BTW - I have domed pistons , too, with no clearance problems.

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Rick Dorion
69 RS Conv,355,M20,4.10's and I don't worry about stone chips ( yet ).
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  #8  
Old Jul 18th, 02, 02:08 AM
stingr69 stingr69 is offline
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It could have been worse!!!

-Mark.
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  #9  
Old Jul 18th, 02, 03:16 AM
drew69 drew69 is offline
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posted 06-28-2002 04:57 AM

We've done some testing at my shop and here is what we found to be the best IMHO.
Spark plugs are graded like eggs. The OEM manufacturers get grade "A". A set of AC spark plugs you buy in a parts store will not last as long as the ones that came new in the engine from the factory.
The best spark plug we have found is Autolite standard (non platinum). A USED Autolite plug produced better spark in a spark plug testing machine than any other new plug we tested.


Here is the AC cross reference.
If you want to try the Autolites
R45T converts to part # 145
R44T is a # 145
R43T is a # 144

Good Luck

------------------
Drew

69' X-11 350, Turbo 350, Factory Air, PS, PB, 12 Bolt (410 gear) & NOT AN SS

[This message has been edited by drew69 (edited 07-18-2002).]

[This message has been edited by drew69 (edited 07-18-2002).]
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  #10  
Old Jul 18th, 02, 04:09 AM
Gseay Gseay is offline
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Has anyone tried the AC RapidFire #4 in their BB.

------------------
1967 Camaro SS/RS 396-375
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  #11  
Old Jul 18th, 02, 04:48 AM
boodlefoof boodlefoof is offline
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just a question... what is the difference between automotive plugs and "small engine" plugs?

I am curious because I had used two or three Champion CJ8Y (or something like that) small engine plugs to get some extra header clearance. Seemed to run fine.

I now have a new motor (hopefully going to fire it tonight) and am curious if these would have any negative effects?
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  #12  
Old Jul 18th, 02, 05:19 AM
RickD RickD is offline
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Drew69, what is the cross reference for the 43S, 45S?

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Rick Dorion
69 RS Conv,355,M20,4.10's and I don't worry about stone chips ( yet ).
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  #13  
Old Jul 18th, 02, 05:20 AM
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I find my self refering to this page a lot www.ngksparkplugs.com/techinfo/spark_plugs/ it's full of some of the best info I've found about plugs...

If you reference factort specs from 60's vintage Chevy mills, you will find the higher HP engines use a colder plug than the lower HP engines do. The rule of thumb is 1 step colder per 75-100 hp. I like the NGK's but AC Delcos' and others I'm sure are fine. the key is the right design or style for your heads. My World SPII's use tapered threads but stock Chevy heads don't. Read through the 3 sections (or links) on the NGK site it will answer most questions.

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...Dennis
"The '69, the '96 & the club"
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  #14  
Old Jul 18th, 02, 06:33 AM
stingr69 stingr69 is offline
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Dennis,
For the stock Chevy engines the smaller peanut plugs (71 and up I think) have a tapered seat. The larger plugs (70 on down) are gasketed.

-Mark.
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  #15  
Old Jul 18th, 02, 08:29 AM
drew69 drew69 is offline
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Rick, glad you asked that. I went back to my earlier post and edited those cross over #'s.

R43S changes over to #85
R44S also crosses to #85
R45S crosses to #86

The numbers I posted earlier are for TS (tapered seat plugs)
R43TS crosses to #25
R44TS crosses to #26
R45TS crosses to #26 also.

These numbers are from a 1998 Autolite catalog. I think Autolite has gone to a 4 number part number system now but you'll still find the older numbers also. I just bought some 26's at Wal-Mart for $1.97 in a two pack & PF-58 AC Delco oil filters for $.50 @ on a close out. My wife was proud of me!

------------------
Drew

69' X-11 350, Turbo 350, Factory Air, PS, PB, 12 Bolt (410 gear) & NOT AN SS

[This message has been edited by drew69 (edited 07-18-2002).]
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