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Old 02-14-2014, 05:01 PM   #1
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Post Glow plug depth

I've been looking at my head button on my Tt .28 bxr. The manual says to use a os 8, which is shorter then the equivalent McCoy 8. The McCoy 8 fits nice and flush with the button. The os8 has 1/8 gap from button to plug. I know the McCoy will add more compression but do u think Ill get more power( a better burn) with the plug being flush at the bottom of the button.
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Old 02-14-2014, 11:20 PM   #2
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Doubtful. I'd guess with the plug being lower in the button and maintaining the same head clearance you stand the chance of the engine burning the plugs out and also a risk of pre-det which will damage the piston, head and plug. I'd stick with the os plug as per manual or os plug equivalents. I run novarossi and so stick with nova plugs. Others may do something different but it's rarely a case of just changing one thing it's usually a combination of things.
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Old 05-14-2014, 04:45 PM   #3
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Not many actually react to this and continue using the short OS plugs in engines that should use a longer plug.

The plug shall always be flush with the button. Using a short plug will decrease compression ratio ---> less power.
On top of that the glow element in the plug will be further away from the button and will make combustion worse ---> the engine will be harder to tune.

I used to have a TTR 21 Pro BX-R engine and using a short OS plug made it perform pretty bad compared to the correct length plug.
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Old 05-25-2014, 04:17 PM   #4
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Quote:
Originally Posted by SManMTB View Post
Not many actually react to this and continue using the short OS plugs in engines that should use a longer plug.

The plug shall always be flush with the button. Using a short plug will decrease compression ratio ---> less power.
On top of that the glow element in the plug will be further away from the button and will make combustion worse ---> the engine will be harder to tune.

I used to have a TTR 21 Pro BX-R engine and using a short OS plug made it perform pretty bad compared to the correct length plug.
Ah but the OS8 is a hardy plug and it will "work" fine in many low rent engines.
Given the choice of course the longer plug is more appropriate.
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