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  #1  
Old 01-16-2009, 07:31 PM
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Default Indexing Spark Plugs - Free Horsepower

Has anyone ever tried indexing their plugs?

A teacher of mine that has been racing top fuel and was a factory sponsored Ford drag racer from the 60's claims you should get a 5 or 6% increase in overall horsepower by doing this.

I did some research, and it appears alot of people have done this and it actually does work out to about a 5% increase in horsepower.

I the OEM bhp is 163hp, you would see approximately an 8hp gain, if everything works out correctly. I'm thinking that would translate to about 6-7whp based on the usual ~140whp I have seen from stock R53's.

It makes the coil work to its max, so something that puts out a bit more voltage may be required.

Economy and free horsepower is good, no matter how small.
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Old 01-16-2009, 09:40 PM
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how is this done?
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  #3  
Old 01-16-2009, 09:46 PM
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Ok... I'll bite... I'm interested too...

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Old 01-16-2009, 10:36 PM
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I could see those numbers on a race car where the cylinderhead and combustion chamber is ideally shaped but I don't think a street-car would see more than one or two HP. I'm fairly certain if there were any real benefits to it people like RMW would be highly suggesting it as a way to get that last little bit of an edge.
Indexing spark plugs is basically where you use a set of washers to ensure the electrodes of the plugs are all in the cylinderhead the same way. I've also heard on fairly small engines of people using spark plugs that protrude some into the combustion chamber more to raise the compression ratio, but that's a trick I was told from someone who races lawn mowers.
http://www.ngksparkplugs.com/techinf...n.asp#indexing
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Old 01-16-2009, 10:48 PM
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Well, we tested it on a 360 Mopar with stock heads. The car was making 395 horsepower at the rear wheels before indexing. One of the instructors also did some kind of trimming on the electrodes and reset the gap. After, on the same day, with no change in ambient temperature, the car put down 416.x horsepower.

The car has an MSD box, 40,000v MSD coil, Champion plugs, and the motor is running E85 fuel.
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Old 01-16-2009, 11:00 PM
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I think the power gain in that case was probably due to a change in gapping to better allow it to ignite the ethanol. Indexing is done with washers so that the open part of the electrode would probably point at the intake valve in that case, it only makes power by somewhat adjusting how the flame front progresses across the combustion chamber and ensure it's actually combusting the richer part of the mixture in the cylinder ( this is assuming the area near the exhaust valve isn't filled as efficiently and thus contains a leaner air/fuel mixture, some engines may fill that area more efficiently and actually benefit from indexing in that direction.)
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Old 01-16-2009, 11:08 PM
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Yes I always index my plugs.


I think I have written a few times about this perhaps not on this forum.

Oh here is a little blirp I found..
post #16
http://www.motoringunderground.com/f...t=plugs&page=2

Nice to see it come up from someone else.

To put it simply my signature says it all.

It is a pain in the as* to do though
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Old 01-16-2009, 11:57 PM
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Nitro, have you proven a power difference? I'd be interested in seeing MINI-relevant numbers.
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Old 01-17-2009, 12:11 AM
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I have access to a dyno at school again, we are trying to get the instructor to let us try it on my car to either help prove or disprove his point.
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Old 01-17-2009, 01:31 AM
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Quote:
Originally Posted by Konstantinos88 View Post
Nitro, have you proven a power difference? I'd be interested in seeing MINI-relevant numbers.
Naw sorry. Nothing I do works/everythings works? It is mentally healthier for me to let others find out things and post.
(shy of forums.)

Quote:
Originally Posted by not-so-rednwhitecooper View Post
I have access to a dyno at school again, we are trying to get the instructor to let us try it on my car to either help prove or disprove his point.

This would be nice! Remember to find the correct plug type and heat range and gap for what you are doing. (see: finding prper heat range plug)

There are no standards for this practise. You will entering the true world of High Performance Tuning.
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Old 01-17-2009, 03:45 AM
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Quote:
Originally Posted by not-so-rednwhitecooper View Post
I have access to a dyno at school again, we are trying to get the instructor to let us try it on my car to either help prove or disprove his point.
definitely, nsr, we'd like to see some numbers if you can get 'em how does your school have a dyno?! I wish UConn had one too haha
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Old 01-17-2009, 06:46 AM
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I assume you can buy indexing washers at any parts store?
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Old 01-17-2009, 07:48 AM
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Quote:
Originally Posted by professor View Post
I assume you can buy indexing washers at any parts store?
No !
These are specialized performance parts.
Summit Racing or Jegs, on line or call them. I get mine from Summit and use Mororso .

I should recommend that anyone considering doing this to read up on it and learn how to index plugs correctly. Because the plug tube is so long on the Mini it is a bit of a challenge to index the plugs. I mark my plugs with a sharpie and keep a record of the size indexing washer I use for each cyd. Also if you can see the combustion chamber of the Minis head this will help you understand the indexing better. This may be why most who sell heads do not get into this information about indexing plugs?

You may find that running a single electrode plug and playing with different gaps more rewarding then indexing? But if you do both you should notice some seat of the pants difference? The actual numbers would have to be tested on a dyno or oscilloscope with before and after testing .


Sorry I hope I am not sounding like a know it all
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Old 01-17-2009, 12:57 PM
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A friend of mine that is going to UTI called a couple of weeks ago to mention this to me. He and I both have Miatas, and since they are both stock right now, any power increase would be nice. He said it actually just smoothed out his idle and it accelerated smoother, but otherwise saw no noticable power gain. He was still impressed though, so I'll be doing it when I swap in the new Miata engine.
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Old 01-17-2009, 04:14 PM
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Yea, would encourage OP to do the dyno, but I still would take any dyno results lightly.
I just don't think you will see any difference on out Minis.
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