Forged Pistons For MP3/P5

C

CharlieP5

Member
I'm currently working with Wiseco Pistons on the creation of a Forged Piston Set for our cars. Since this is a special order I can ask them for a discount.

Are you guys interested?
They told me once the pistons are made they could provide me with any compression I want.

They already have the stock P5 Piston. All I need now is the Head Compession CCs. Anybody know what it is?
 
the stock compression ratio is 9.1:1 (or 9.0:1). that with the bore and stroke should give you a good 'guess' of the stock cc of the head.
 
Do you mean you need to know the Displacment of our engines?
If so then the Displacment of the 2.0L in the MP3 is 1991cc (should be the same on all 2000+ 2.0L)
The Compression Ratio is 9.1:1

You can look Here for more info.
 
I'm pretty sure what CharlieP5's looking for is the cc's found in the head. Pretty much when the piston is at TDC, how many cubic centimeters of space is there between the top of the piston and the top of the combustion chamber. You use this to determine how much of a dome or how much of a dish you want to build the piston with, if you want to raise or lower the compression. It's the same principle as putting in a thinner or thicker head gasket to change your compression. Sorry I don't know the answer to your question but maybe this explanation will help find someone who does know the answer.
 
njaremka said:
the stock compression ratio is 9.1:1 (or 9.0:1). that with the bore and stroke should give you a good 'guess' of the stock cc of the head.
Click to expand...

like i said (and nobody chose to listen) with the comprssion ratio and the bore/stroke figures, you can guess at what the head volume is. (the only other thing you will need in this guess work, is the thickness of a stock head gasket)

doing some quick calculations, i get a volume of 61.5cc above the piston at TDC. subtract the volume taken up by a stock head gasket, and you get the head chamber volume.

:rolleyes:
 
njaremka,

Thanks for the Info. I'll try to find out what the thickness of the stock head gasket so we can figure out the cc's without guessing.
Can you post the Formula.

Stou,

They told me that when I give them the information they will be able to provide us with pistons from 8.1:1 to 12.5:1 comp ratio.
 
if you will be using a stock head gasket when you rebuild your engine, you really do not need to know the thickness.

the compression ratio tells you the relationship between the volume above the piston at BDC and at TDC. If this is 9.1:1 for the protege 2.0 liter engine, then to find the volume above the piston at TDC you divide the displacment of one piston by the compression ratio less 1. it would look somthing like this:

(displacement of piston) / (comp ratio - 1) = (volume above piston at TDC)

and specifically for the 2.0 liter protege:

(498 cc) / (9.1 - 1) = 61.5 cc


i forgot to add: it may help to think of the compression ratio this way - when the piston is at BDC, there is 9.1 parts volume above it, and at TDC there is 1 part volume above it.
 
Last edited:
njaremka said:
if you will be using a stock head gasket when you rebuild your engine, you really do not need to know the thickness.

the compression ratio tells you the relationship between the volume above the piston at BDC and at TDC. If this is 9.1:1 for the protege 2.0 liter engine, then to find the volume above the piston at TDC you divide the displacment of one piston by the compression ratio less 1. it would look somthing like this:

(displacement of piston) / (comp ratio - 1) = (volume above piston at TDC)

and specifically for the 2.0 liter protege:

(498 cc) / (9.1 - 1) = 61.5 cc


i forgot to add: it may help to think of the compression ratio this way - when the piston is at BDC, there is 9.1 parts volume above it, and at TDC there is 1 part volume above it.
Click to expand...

Thanks,

I'll talk to them today. Hopefully they will tell me how long this whole process will take.
I asked them about forging rods for us but they reffered me to Eagle Rods. Let's see what they tell me.

After all of this hard work it's 15psi baby!
 
Sound good man! I would be interested also! How much for the pistons? Also, as soon as you find out about the rods (if they can produce them and how much they cost) I would be interested in a set also! Thanks.

Dave
 
Let's see how this goes.

Since they are going to create the pistons from scratch the guy at wiseco pistons told me they could take from 2-3 weeks.

I expect the same time frame with the rods.

They have not told me a price. But since this is a special order the quantity ordered will impact the price. This will not be a groupbuy or anything like it. I will have to ask for antoine's permission to sell these to the members once the companies get back to me. Hopefully I can become the first authorized vendor to carry forged rods and pistons for our cars.:D
 
Rods would be super nice in our cars.
for high psi boost, our beautiful mazda block is ready to rumble, with the exception of the rods, our "weakest link." After spending far too much time listening to mazda drivers wax poetic about the strength of their blocks, it seems that about half the folks (non-rotary) have thrown a rod. The one guy I've talked to (a car freak from Elkhart Lake) who ran turbo AND NoS threw a rod on his first all-out drag run. Of course, this man also owns a 900 hp 5.0 stang, so he's already lost to the darkside.
 
Man, be sure to let me know how the process goes. I am definitely interested in getting some stronger internals put in at the end of the year. (drinks)
 
hell yeah...i am down...u tellthem that i will be interested in these pistons after this month ......after this month....comes EVERYTHING!!!....hehehe....i am soo hyped....i am bout to join that fabulos DARKSIDE!!!!!!!......YEAH!!!!!!!!...
 
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They shoul be getting back to me either today or tommorow with at least an estimate on the $$$.

I'll be sending the rods to Eagle Rods sometime next week.
(redp5)
 
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