My new pistons

[SpoolinPro93]

Well good news... my car will finally be ready to go pretty soon.. but I am worried about the pistons that I got. I got .040 overbored pistsons from a company called Viking Imports in Charlotte. My concern is when looking at the top of the piston it is raised in the middle a bit, compared to the stock pistons I have which are "dished" a little bit. I supposed I need to call the company to see what kind of compression they will make, because I don't think I want to raise the compression all that much. Any suggestions as to what I should do?

[JesseSays]

find out the compression ratio. for sure.

[zorlac7]

raised pistons have more compression than dished pistons..if u have turbo, i don't think that u want to put it.

[Protoss]

Originally posted by zorlac7
raised pistons have more compression than dished pistons..

i'm sure most people are aware of this, but thank you for stating it. (no sarcasim), but domed pistons also have potential issues with valve clearances.

if u have turbo, i don't think that u want to put it.

This all depends on the overal compression ratio, the strength of the block. the higher your compression the more efficent your engine; this is something some people take into acount.

[zorlac7]

valve clearance is important point too..but i think that if they are oem pistons..they shouldn't have problems.

[Protoss]

dohc pistons with a bp01 head (sohc) i have heard that valve clearance is something to watch. dome'ing the pistons could prove to be a problem

[JesseSays]

Originally posted by zorlac7
raised pistons have more compression than dished pistons..if u have turbo, i don't think that u want to put it.

depends on the wrist pin height.

[zorlac7]

Originally posted by Protoss
dohc pistons with a bp01 head (sohc) i have heard that valve clearance is something to watch. dome'ing the pistons could prove to be a problem

ohhh..it's a single cam head..well..u have to check the clearance because the pistons and more if it's raised, should be a little more higher than sohc pistons.

[SpoolinPro93]

Thanks for the responses. I haven't had internet access in weeks so I'm just now reading them all. The car is running now... with those pistons, and seems to be fine at the moment. Still a few things to work out though.

[Identity_X]

Did you ever find out the compression ?

[SpoolinPro93]

Originally posted by Identity_X
Did you ever find out the compression ?

My dad thinks it bumped it up .5 to a 9.5 compression ratio. Of course we're not positive though.

[bruce95fmla]

how much did those pistons run you ...
I want to run the miata pistons in the 323 .. but considering forged in the protege

[SpoolinPro93]

Originally posted by bruce95fmla
how much did those pistons run you ...
I want to run the miata pistons in the 323 .. but considering forged in the protege

The pistons and rings cost about $200. They're not forged they are oem material.. cast iron I guess.

[ImportDragn311]

how much compression can you bump to with a gtx turbo on there?

[SpoolinPro93]

Originally posted by ImportDragn311
how much compression can you bump to with a gtx turbo on there?

I'd say it's all in the tuning, but I prob. wouldn't go above 10:1.