Namura Piston

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WHAT?


What does that word mean?

This is all I could find...
1.Surgency
Surgency is a trait aspect of emotional reactivity in which a person tends towards high levels of positive affect.


Seriously,I/we would like to help. Perhaps re-phase your question.
 
One could only assume "Any suggestions?"

Namura pistons are fine pistons, just make SURE you run at the proper cylinder to piston clearance (book says .0014" - .0016") to keep them from slapping. A slapping cast piston is practically a ticking time bomb.
 
Sorry,but my english is not good :-[.. Namura piston are good than wiseco?? Any help


It is ok. There are varying opinions on this subject. Some people prefer cast pistons, personally I do not.

Cast pistons are "poured" into a mold which makes a piston that is actually 1 million tiny aluminum balls all lightly "stuck" together.

Wiseco pistons are forged. They are formed by heating a "slug" of high silicone aluminum and then punch pressing it into a die assembly. This compresses the aluminum into a more dense (and stronger) matrix.

It comes with a penalty, however. They expand at a different rate than cast pistons (cast pistons use .0015" piston to cylinder clearance while forged pistons run as much as .003" clearance. This make them generally noisier than cast piston. They require more warm up time than cast pistons because the aluminum is more dense.

Personally, I run all forged pistons and don't recommend anything else. Do Namura (and all cast piston for that matter) run well? Of course! Will they explode into a million little tiny aluminum balls if they are stressed? Of course!
 
Oye lo que puedes hacer es ir a Google y escriba en traducir y subir a ese y transferir nuestro Inglés para españoles y luego, cuando usted dice algo en español, lo tranlate a Inglés y cpoy y pegarlo!
 
It is ok. There are varying opinions on this subject. Some people prefer cast pistons, personally I do not.

Cast pistons are "poured" into a mold which makes a piston that is actually 1 million tiny aluminum balls all lightly "stuck" together.

Wiseco pistons are forged. They are formed by heating a "slug" of high silicone aluminum and then punch pressing it into a die assembly. This compresses the aluminum into a more dense (and stronger) matrix.

It comes with a penalty, however. They expand at a different rate than cast pistons (cast pistons use .0015" piston to cylinder clearance while forged pistons run as much as .003" clearance. This make them generally noisier than cast piston. They require more warm up time than cast pistons because the aluminum is more dense.

Personally, I run all forged pistons and don't recommend anything else. Do Namura (and all cast piston for that matter) run well? Of course! Will they explode into a million little tiny aluminum balls if they are stressed? Of course!

Thanks for the info man! :)
 
Oye lo que puedes hacer es ir a Google y escriba en traducir y subir a ese y transferir nuestro Inglés para españoles y luego, cuando usted dice algo en español, lo tranlate a Inglés y cpoy y pegarlo!

Esa es buena opcion, gracias Blasterr!! Oye y de donde eres q hablas Espanol?
 
Namura pistons are GREAT pistons! Cast pistons work GREAT! Wiseco pistons are great too. The important part is proper cylinder to piston clearance,proper jetting and high quality oil!!! A forged piston requires a religious warm up (just be patient),or you can get a four corner seizer. They also tend too swell more when over heated. Cast pistons are much more forgiving with short warm periods. I run cast piston ALL THE TIME,but I follow the rules I stated above. I've also ran forged wiseco pistons too,but prefer the cast pistons.

Don't be fooled into thinking that a forged piston is like superman. Not so. They can fail too. Proper set up is important!

Here's a failed wiseco...

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and another...
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and another...
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and so on...
imagesCAR8V5SA.jpg


Here is a failed cast piston...

imagesCA13HFOD.jpg

and another...
0411001739.jpg


Bottom line... follow the above rules.
 
In over 50 years of riding and repairing, I have never had an issue with a cast piston.

With regular preventitive maintenance, correct jetting and a good supply of lubrication, a cast piston should serve you well.

Both pistons require a warm up period, the forged one somewhat longer.

Most of the piston/bore wear in any internal combustion engine takes place when the motor is below optimum operating temp, as the piston warms up quicker than the surrounding material.

Both cast and forged pistons have their advantages and disadvantages.

I choose to use cast pistons in somewhat stockish situations, but if the motor is to be used for extreme, punishing work, then a forged piston would be my obvious choice.

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En más de 50 años de montar y reparar, nunca he tenido un problema con un pistón de fundición.

Con el mantenimiento Preventiva regular, corregir chorro y una buena cantidad de lubricación, un pistón de yeso debe servir bien.

Ambos pistones requieren un periodo de calentamiento, el forjado algo más larga.

La mayor parte del pistón / desgaste del agujero en cualquier motor de combustión interna tiene lugar cuando el motor está por debajo de la temperatura óptima de funcionamiento, cuando el pistón se calienta más rápido que el material circundante.

Ambos actores y pistones forjados tienen sus ventajas y desventajas.

Elijo usar pistones de fundición en situaciones un tanto stockish, pero si el motor se va a utilizar para el trabajo extremo, sancionar, entonces un pistón forjado sería la opción obvia.

Piston vida se puede extender por completo el calentamiento del motor antes de tener que trabajar duro!

Piston life can be extended by fully warming up the motor before being asked to work hard!
 
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