Post by tintruder on Oct 30, 2010 23:24:57 GMT -5
Greetings,
I have already put one of these in my RE5 which loves to foul the original plugs.
It already starts much better, and if I had to guess, I think it has to do with the size and shape of the spark and resultant flame front in the combustion chamber.
I got my NGK LMAR9E-J online for about $8.00 each. They have 2 opposing prongs approaching the center electrode, giving plenty of surface area to allow the spark to propogate, even if there's some oil involved.
I understand Yamaha uses this design in the R1 because it produces a strong spark in a very tough environment (imagine the R1 turning 17,000RPM!!!)
As to "pollorey" asking about why the removal is such an issue; you must note that the original insert in the motor is NOT removable.
The existing insert has the small hole in it, in part, to protect the plug from the heat generated in the rotary engine, which is higher than in most piston motors. (Mazda uses a similar configuration) It also helps limit preignition.
If this insert is damaged, you can't just put in a helicoil, as this will require tapping out to a diameter which would cut through the insert and cause the face of it to fall into the motor, causing even more damage.
(Jess's adapter does not replace the existing bronze insert...it threads into it just like the OEM plugs did, and positions the new and widely available plugs in a position to enhance combustion efficiency)
As Jess said, be sure to use Anti Seize when you put yours in. This will prevent galvanic corrosion between the 303SS and the Aluminum case as well as with the existing bronze insert.
I found that a 30mm wrench fits perfectly on the Hex of the adapter, but because most 30mm wrenches are about 18 inches long, resist the temptation to really tourque these things down...the stainless is much stronger than the bronze insert and you could damage the motor by over-tightening.
Jess, I hope you made a ton of these, because I think this is a MUST HAVE for anybody riding a RE5 today. Given the cost of Stainless Steel and quality CNC Manufacturing, the price is a bargain!
Tom
I have already put one of these in my RE5 which loves to foul the original plugs.
It already starts much better, and if I had to guess, I think it has to do with the size and shape of the spark and resultant flame front in the combustion chamber.
I got my NGK LMAR9E-J online for about $8.00 each. They have 2 opposing prongs approaching the center electrode, giving plenty of surface area to allow the spark to propogate, even if there's some oil involved.
I understand Yamaha uses this design in the R1 because it produces a strong spark in a very tough environment (imagine the R1 turning 17,000RPM!!!)
As to "pollorey" asking about why the removal is such an issue; you must note that the original insert in the motor is NOT removable.
The existing insert has the small hole in it, in part, to protect the plug from the heat generated in the rotary engine, which is higher than in most piston motors. (Mazda uses a similar configuration) It also helps limit preignition.
If this insert is damaged, you can't just put in a helicoil, as this will require tapping out to a diameter which would cut through the insert and cause the face of it to fall into the motor, causing even more damage.
(Jess's adapter does not replace the existing bronze insert...it threads into it just like the OEM plugs did, and positions the new and widely available plugs in a position to enhance combustion efficiency)
As Jess said, be sure to use Anti Seize when you put yours in. This will prevent galvanic corrosion between the 303SS and the Aluminum case as well as with the existing bronze insert.
I found that a 30mm wrench fits perfectly on the Hex of the adapter, but because most 30mm wrenches are about 18 inches long, resist the temptation to really tourque these things down...the stainless is much stronger than the bronze insert and you could damage the motor by over-tightening.
Jess, I hope you made a ton of these, because I think this is a MUST HAVE for anybody riding a RE5 today. Given the cost of Stainless Steel and quality CNC Manufacturing, the price is a bargain!
Tom
