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05-19-2019, 12:45 AM
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#1 |
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Registered User
Join Date: Nov 2006
Location: Sutherlin Oregon
Posts: 493
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Spark plugs and gas
I am running typical Chevy 350's, mild cam, aluminum intake, and headers.
I have always used R44TS or R45TS plugs. When these engines were made and plugs were spec'd we had leaded gas and decent unleded. Now with 10% ethanol is there a better plug or heat rang to use to work better with the gas? This is street driving, car shows and cruises. No race track near me or I would be there. |
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05-19-2019, 09:51 AM
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#2 |
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Account Suspended
Join Date: Jun 2015
Location: No longer here
Posts: 1,000
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Re: Spark plugs and gas
Are you experiencing any issues ?
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05-19-2019, 02:19 PM
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#3 |
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Registered User
Join Date: Nov 2006
Location: Sutherlin Oregon
Posts: 493
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Re: Spark plugs and gas
I have 2 350"s that just don't seem to be running as good as they should. Both have the same plugs. I know the gas now starts to go bad sooner than it used to. My older cars don't get driven as often and maybe the gas is a problem sometimes. Maybe a hotter plug would help.
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05-19-2019, 03:06 PM
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#4 |
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Registered User
Join Date: Aug 2009
Location: Bowser
Posts: 13,512
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Re: Spark plugs and gas
Maybe you need to start the burn earlier.
What’s your initial timing? |
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05-19-2019, 08:48 PM
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#5 |
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Registered User
Join Date: May 2016
Location: Henderson NC
Posts: 975
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Re: Spark plugs and gas
I would try some fresh gas first. I have a cuz with some old hotrods that he only cranks a couple time a year. He keeps messing with the plugs and carbs trying to get them to run right. I keep telling him the gas today doesn't last that long but he wont listen. He even tries mixing new gas with the old.
I would drain the tank and put fresh gas in it. Who knows the gas may not be the problem but a few gallons of fresh gas doesn't cost a fortune and it may just fix the problem. |
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05-20-2019, 11:14 AM
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#6 |
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Senior Member
 
Join Date: Sep 2014
Location: Wenatchee, Wa
Posts: 897
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Re: Spark plugs and gas
I run 92 non ethanol unleaded in all my power equipment and the 68. I do not have fuel issues but agree with GaryD that getting them out and driving them makes a big difference.
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05-20-2019, 04:12 PM
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#7 |
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Registered User
Join Date: Oct 2005
Location: Overland Park, Ks.
Posts: 5,190
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Re: Spark plugs and gas
The R45TS ought to work real good in there. It is an average heat range & extended tip. It shouldn't foul unless you are awful rich or the gas a really raunch.
George |
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05-20-2019, 06:14 PM
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#8 |
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Registered User
Join Date: Aug 2012
Location: Oklahoma City, OK
Posts: 2,477
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Re: Spark plugs and gas
Assuming HEI dizzy, make sure your gap is .045. IIRC - I am using the equivalent to the R44TS in my 75. OEM spec was R44TX with a .065 gap. Later years dropped to the now HEI standard of .045.
The newer gas does seem to leave buildup in the carbs faster then the older gas did. Might be worth running a batch of your favorite carb cleaner through them. Might be a simple as making a point to have lunch at an eating place that is 50 or so miles away as a reason to get them out on the highway at speed. |
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05-20-2019, 08:14 PM
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#9 |
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Registered User
Join Date: Oct 2013
Location: Maine
Posts: 2,334
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Re: Spark plugs and gas
Since I don't want to start a spark plug war I will just throw my .02 in and leave it at that. I have never gotten more than 2 years out of AC plugs and ditched them years ago. And, that slow burning 92 octane just carbons up low performance engines.
Even a new set of AC plugs should have you running fine again for a couple years.
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