Turbo plugs discussion

Old 10-04-2012, 09:15 PM
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Default Turbo plugs discussion

There was some discussion on some other threads about tapers being different between brands. I had done some measuring over 5 years ago but decided to do some more measuring and report what I found.

I used an optical comparator to measure tapers and width accross the bottom.




Here is the dimensions I found on these plugs, all seem to be 60 degrees with a 3/16 or .187 bottom dia. The differences between plugs is probably just more of a difference in manufacturing tolerance than difference between brands. These are not ground so you will see some difference in the same brand.



Now I am not saying every brand plug will work in every motor. Os for example does not tap the thread as deep as others in the head button down to the taper. You will notice the Os has what appears to be a shorter taper. It has a smaller dia. between the taper and thread for clearance. So if you try a Nova plug in a Os the threads may bottom out before the taper seals.
I have also heard of problems using a Os plug in a Nova motor and some other brands. I feel that if the Os plug is overtightened it may smash the taper in the head into the chamber some. This is because it has a slightly shorter taper so the force is put on a smaller area.

Rex
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Old 10-04-2012, 10:53 PM
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Originally Posted by 22Racer
There was some discussion on some other threads about tapers being different between brands. I had done some measuring over 5 years ago but decided to do some more measuring and report what I found.

I used an optical comparator to measure tapers and width accross the bottom.


Here is the dimensions I found on these plugs, all seem to be 60 degrees with a 3/16 or .187 bottom dia. The differences between plugs is probably just more of a difference in manufacturing tolerance than difference between brands. These are not ground so you will see some difference in the same brand.



Now I am not saying every brand plug will work in every motor. Os for example does not tap the thread as deep as others in the head button down to the taper. You will notice the Os has what appears to be a shorter taper. It has a smaller dia. between the taper and thread for clearance. So if you try a Nova plug in a Os the threads may bottom out before the taper seals.
I have also heard of problems using a Os plug in a Nova motor and some other brands. I feel that if the Os plug is overtightened it may smash the taper in the head into the chamber some. This is because it has a slightly shorter taper so the force is put on a smaller area.

Rex
the length of the taper is ?

60 +/- was known beforehand but great job confirming Rex

highlighted area above is what i was trying to get across to guys for a long time

conclusion: i wouldnt recommend ,nor would any faithful novarossi user, to thread os plugs in your novarossi unless you never plan on switching back to odonnell or novarossi plugs

your
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Old 10-04-2012, 11:00 PM
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Great info and it makes complete sense Thanks for posting that's a cool instrument
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Old 10-04-2012, 11:38 PM
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the reason why I use os p4 plugs in my Nova mills is because they idle stronger, THEREFORE why would i want to change back to a NOVA plug??? That's all i will say on this point.
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Old 10-05-2012, 04:52 AM
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The OS and Voodo look very simular. I am suprized to see how shallow the angle is on the OD plug campared to the rest. That's a 20* differnce to the rest.
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Old 10-05-2012, 05:26 AM
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Originally Posted by rider313
The OS and Voodo look very simular. I am suprized to see how shallow the angle is on the OD plug campared to the rest. That's a 20* differnce to the rest.
Thats a 5 rider not a 3.
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Old 10-05-2012, 05:43 AM
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IMO the length of the taper has little value..the real thing is the angle...if the angle and width is the same the plugs are going to seat properly.... so IMO a OS plug has just as much chance of damaging a OS button from over tightening as it does a Nova button !

Last edited by Maximo; 10-05-2012 at 06:03 AM.
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Old 10-05-2012, 07:32 AM
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Originally Posted by THE PHILLY JYNX
Thats a 5 rider not a 3.
Wow. I'll chock that one up to early morning eyes. Lol
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Old 10-05-2012, 07:42 AM
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Damn, it finally got quiet after the last plug debate. Now another new thread.
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Old 10-05-2012, 07:58 AM
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Over the last 20 years I have run every brand plug in every brand engine and never had any problems with sealing let alone any other issues. And that is with switching back and forth from brand to brand to whatever the local shops had in stock back then.
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Old 10-05-2012, 09:33 AM
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I see the plug debate rages on
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Old 10-05-2012, 09:43 AM
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Originally Posted by Rcrenew
Over the last 20 years I have run every brand plug in every brand engine and never had any problems with sealing let alone any other issues. And that is with switching back and forth from brand to brand to whatever the local shops had in stock back then.
+1, i have also used OS plugs, OD plugs, voodoo, nova, werks, in my novarossi, ninja, OS, werks engines with no issues at all.
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Old 10-05-2012, 01:34 PM
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I have never had any problems switching from different brand plugs. I ran quite a few of the Voodoo plugs a couple years ago, they are relieved similar to the Os.
I am sure with the amount of motors Monty works on he has seen a few messed up head buttons. Maybe the Nova head buttons are the problem? Just kidding, I have ran Nova's in the past with no issues, my favorite was the 421b!

Rex
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Old 10-05-2012, 03:18 PM
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Debates are cool as long as they are respectful and people dont get bent. The moral of the story is run what you want and enjoy your micro engine even if its spurting fuel out of the button > Joke
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Old 10-05-2012, 03:31 PM
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Originally Posted by bigjayjay1
Debates are cool as long as they are respectful and people dont get bent. The moral of the story is run what you want and enjoy your micro engine even if its spurting fuel out of the button > Joke


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