alright pistons guru, this one is for you. i'm interested in an analysis of advatages of each style of pistons, such as: flattop, dish and dome in force induction application. what's the pro & cons of each type.

 

It all comes down to tuning. Dish will give more room for error where the dome (more suited for N/A) will require a more attentive tune.

Theres many other roles as well. Say for instance if your researching turbo choice...compression can help here.
I personally like mid 9.x:1 up to 10:1 , but most will say 9:1 and lower. I like this cause you dont really sacrifice much power loss under vaccum before your turbo spools. Low compression guys tend to run lots of boost cause they can, but it all equalls out cause higher compression will make more power with less boost pressure and it'll spool faster. Ever drive 8.5:1 compression in boost.....its like riding on a slugs back.

Its all about tuning.

 

You will get the most even flame distribution using a flat-top piston. I am not speaking from experience...this is something that was written by Nissan guru Mike Kojima.

The problem with a flat-top piston is that it may yield too much compression in some cases (small combustion chamber) or not enough in others (large combustion chamber). Then you generally need to resort to a dish or dome to get what you want afa compression.

Generally, if you want a low comp piston (9:1 or less), it's gonna be dished. If you want a high comp piston, it's gonna be domed. Most of the off the shelf pistons are setup that way. You can of course get anything you want if you buy a custom setup, but that is $$$$.

I just built my motor around 8.7:1 compression and I kinda wish I would have gone with something a little higher. Turbo is not on yet, but the torque from slightly higher compression woulda been nice, too.

Sonny

 

thanks guys.

8.7:1 cr off boost is quite slughish, especially on H motors. looks like majority of the low compression setups are DISH type. I hope to pick up some 9.5:1cr configuration on the D pretty soon.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sonny &raquo;</TD></TR><TR><TD CLASS="quote">
You will get the most even flame distribution using a flat-top piston. I am not speaking from experience...this is something that was written by Nissan guru Mike Kojima.

The problem with a flat-top piston is that it may yield too much compression in some cases (small combustion chamber) or not enough in others (large combustion chamber). Then you generally need to resort to a dish or dome to get what you want afa compression.

Generally, if you want a low comp piston (9:1 or less), it's gonna be dished. If you want a high comp piston, it's gonna be domed. Most of the off the shelf pistons are setup that way. You can of course get anything you want if you buy a custom setup, but that is $$$$.

I just built my motor around 8.7:1 compression and I kinda wish I would have gone with something a little higher. Turbo is not on yet, but the torque from slightly higher compression woulda been nice, too.

Sonny
</TD></TR></TABLE>

do you have that article on nissan tech i read it on the twinturbo.net forum when i had my 300zx but you still have seen it

 

bump