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Old 02-18-2009, 07:06 PM   #31
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Originally Posted by lowey79 View Post
Wow, there's a lot of technical info coming out here! I'm learning
Same here.. but my experiance with the turbo plugs also is that they do last alot longer than the standard plugs..
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Old 02-24-2009, 08:01 AM   #32
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Thanks Powerhouse for those interesting posts.

If i am understanding correctly, a turbo plug/head will not actually have an impact on performance, barring lasting longer and having the word Turbo in it's name?
I have heard lots of people coming out with lots of different reasons and haven't taken the time to figure out ins and outs and learn about it all and try to seperate common knowledge from facts, but i just got a turbo plugged engine.

My intitial curiousity going by my understanding is... is a turbo head simply something that is most effective incorporated into a design rather than an addition or "upgrade" to an engine? ie, a tool or a solution during design as opposed to making an engine better/faster after purchase?
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Old 02-24-2009, 09:23 AM   #33
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Ian- you are exactly right, mostly design rather than upgrade. They designed the turbo plug for several reasons but mostly for sealing the chamber without the use of the washer. During all of this, rumors started that turbo plugs were harder to tune, didn't last as long, less fule milage etc. Now all of a sudden, they are easier to tune, last longer and make more power using less fuel. The design of the plug didn't change nor did the overall design of the engine. Where did all the rumors start from before???? What happens is a few people have some trouble with something new and different and they don't take the time to get it figured out and then the bad words come out and then everyone believes it and it becomes standard practice to avoid something. Then someone takes the time to figure it out, spreads the word and then it becomes gospel. Like I said earlier in this thread, everyone has a little different way to test things and everyones final result will vary slighty and that's where you get your opinion's from.

I have had engines that didn't run well with either style plug and it wasn't until I race ported them that they actually ran very well with either style plug. So it wasn't the plug dictating the engines characteristics, it was the overall design. Like I was saying before, I have tested the standard vs. turbo plug theory so many times and have found that the finished engine product is more important to an engines overall performance and characteristic's than plug design. All a glow plug is, is a thin coil that glows from current resistance and depending on the thickness of the filament, will depend at what temperature the plug is and that in turn will determine when the mixture starts to burn based on what the flash point of the fuel being burned is.

Fuels are a little different from brand to brand as far as when they are mixed, nitro quality along with percentage, types of oil being used, how much heat the compression process makes, flash point of the fuel etc. not to mention compression ratio between engines, squish band length and thickness, entrance angle, dome design etc. That's why different people have different results as they will test things differently and depending on what works for them, they will derive their own opinion which in turn is posted for all to read and depending on who you are and what you yourself has experienced from your own tests, you will make a formidable opinion as to what works best for you.

I'm sure you guys have noticed that everyone has opinions on tapers of different brand plugs and what seals, what leaks etc. So why is a turbo plug that may be leaking in the taper better than a standard plug that may or may not be bleeding through the threads or at all???? If a turbo plug leaks through the taper, it's leaking through the threads as well so the thoery of the turbo having better compression haults right there.

Like I was saying before, I have tested it and have found that unless the test and control factors are identical or as close as possible, you will have different conclusions making everyone's answer alittle different thus resulting in different opinions. I guess the best advice is do what works the best for you!! If the turbo plug works better for you....use it, if not.....don't use it. I have had turbo plugs die 2 minutes out of the package and have had them last several gallons and the smae goes for the standard plugs so I have found it to be more of a crap shoot than anything. I just choose the brand of plugs that have given me the most consistant results and reliability factors and they may not be the same brand Joe Blow has found that works the best for him so again, different people getting different results based on there testing equipment and environment.
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Old 02-24-2009, 09:54 AM   #34
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Thanks for the clarifications and insight.

For disclosure sake and why i read this thread is i just picked up and broke in a Jammin .21 (Picco) that came with a turbo head, and was pleasantly suprised how easy to tune it is and how good the idle is after hearing all the "common knowledge". One thing i have learned, or maybe observed is a better term... is that engine testing can rarely be done in the field under scientific testing conditions, it can only be done by specialists with the equipment, the tools and the money needed to invest in the amount of engines needed to take out the variables.

My conclusion at this point... "Turbo Plug" is a bit of a misleading name.

Enjoying the Jammin though, a lot of bang for the buck... a lot of power in there, it's being oiled and bagged as a great back up engine when i pick out something with a smoother powerband and same kind of power.
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Old 02-24-2009, 10:11 AM   #35
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Wow there is so much good info in this thread alot more than I thought I would get. Thank you all for adding that very techical info this should be a good read for anyone who wants to know about enigines.
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