Spark Plugs for 82 FI

ylbill · Post by **ylbill** » Fri Jan 27, 2012 6:38 pm

I'm gathering parts for a Spring tune-up. I'm looking at the Bosch Platinum +4 spark plugs. First, has anyone had experience with these plugs or suggest a better plug? Can someone confirm that the part number is 4477? Thanks!

ga.spyder · Post by **ga.spyder** » Fri Jan 27, 2012 8:05 pm

I know of 2 people who used the +4 Bosch plugs,and said the car ran awful!

One guy took them out after one day,and put in something else.I have run the Bosch single platinum in my 82 with no issue,but the cars originally came with copper plugs.The last Spring,I put Bosch coppers in($1.99 ea) and ran them all year.I drive the car hard and the miles included a couple 'Dragon' runs and 2 auto-x's with no issues at all. I will put the copper plugs back in this Spring.

ylbill · Post by **ylbill** » Fri Jan 27, 2012 8:58 pm

ga.spyder wrote:I know of 2 people who used the +4 Bosch plugs,and said the car ran awful! One guy took them out after one day,and put in something else.I have run the Bosch single platinum in my 82 with no issue,but the cars originally came with copper plugs.The last Spring,I put Bosch coppers in($1.99 ea) and ran them all year.I drive the car hard and the miles included a couple 'Dragon' runs and 2 auto-x's with no issues at all. I will put the copper plugs back in this Spring.

Thanks for the info Craig. I was about to buy the +4s because IAP gives them a pretty good write up.

ga.spyder · Post by **ga.spyder** » Fri Jan 27, 2012 9:29 pm

Bill,they may be fine.It is just odd that 2 different owners warned me about those plugs,though.Both of them have f.i. cars.The guys at IAP usually give pretty good advice.I have run the single platinums for a full season with no problems

vandor · Post by **vandor** » Fri Jan 27, 2012 10:59 pm

Stay away from Platinum plugs. They often do not work well in older cars. There is no point in putting it in a classic car anyways, as they usually do not get driven enough to bother getting a very long lasting plug for. How long is it going to take to drive 30-40-50k miles?
Just use the regular Bosch plugs, or if you want an upgrade, you can go for the NGK BPR6ES-11. If you really want to spend some money you can buy the NGK's in Iridium, those seem to work well in Spiders.

So Cal Mark · Post by **So Cal Mark** » Sat Jan 28, 2012 12:22 am

just buy the Bosch or NGK copper plugs, you're better off and keep a few bucks in your pocket. Be sure to put anti-seize on the threads when you install the new plugs

coise · Post by **coise** » Sat Jan 28, 2012 9:25 am

Personnally, it depends on the engine you have. Is it modified?
Here is a thread about it:
http://www.guy-croft.com/viewtopic.php?f=4&t=2279

I´ve learned a lot reading it, the guy who wrote it is actually an engineer for the Champion spark plug division.
Hope that helps.

ga.spyder · Post by **ga.spyder** » Sat Jan 28, 2012 9:46 am

Just a follow up on what Mark and Csaba said(they are true experts),the only real advantage to platinum or iridium plugs is that they last longer.They dont burn any hotter or more efficiently than a copper plug.There was no such thing as these precious metal plugs when our cars were built,they all came with and reccomended copper plugs.So,if we are all changing them every spring anyways...spend the extra money on some gas!!

pastaroni34 · Post by **pastaroni34** » Sat Jan 28, 2012 2:04 pm

I recommend using the normal (non-Iridium) plugs ($~3ea) for tuning purposes, then switching to Iridium ($11ea) once you're running right. While tuning I usually keep 3 sets of plugs around because once they get fouled you can forget about getting a proper tune.

The thread on GC's site contains a lot of very good information. I have found that using the NGK plugs with the smaller electrode and tapered ground electrode does reduce fouling, I believe this is because the spark is produced in a more consistent spot. I also like that it reduces shrouding the flame front. This is where the Platinum 4's fall on their face. So much shrouding and non-consistent spark location.

There are other plugs without a ground electrode, or a very small one. These are great as there is virtually no shrouding of the flame front but if you have no electrode, spark location is not consistent. Small electrode versions have consistent spark but more likely to burn up/erode. Plus there is the cost.. some can be over $20ea.

There is always a balance between plug longevity and ultimate performance. The street/OEM plugs will sustain more damage from improper tuning but will also give up some performance. Whereas the racing plugs above will only survive with perfect tuning. Even then some are only designed to last a few hours of racing.

I also have switched completely to resister plugs to reduce noise/interference. I highly recommend these for anyone running an aftermarket ECU.

Spark Plugs for 82 FI

Spark Plugs for 82 FI

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Re: Spark Plugs for 82 FI

Re: Spark Plugs for 82 FI

Re: Spark Plugs for 82 FI

Re: Spark Plugs for 82 FI

Re: Spark Plugs for 82 FI

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Re: Spark Plugs for 82 FI