hey guys... i am about to start doing internals on mhy gsr ... and i was gonna go pistons first since i wanna build from bottem.. up..... anyways.. i was looking at deal on pistons and rings and etc....and i dunno what i need.... what is a whole package... and can someon explain the bore and stroak and stuff like that.... i tried researching but all they tell me is the specs of the pistons.... so anyway i was just wondering what kinda of pistons you guys recommend and what i need ... if you can tell me all the misc small parts that i need to do with pistons....... i eventually want to have a really built car ... im gonna jump 2 stage 2 or 3 cams in the future.... which is why i am getting pistons first... let me know whats going on please....

 

Well, you're asking some general questions.

The piston you choose will depend on a number of factors.
1. What type of goal are you trying to achieve with your car?
2. How much power do you want to make?
3. How much money do you want to spend?
4. And to a lesser extent, will this be a street driven car? I'm asking because you can have a high compression setup that can run on race gas.

You need to determine what compression ratio piston you will need. Compression ratio is the ratio of volume in the combustion chamber when the piston is a BDC (bottom dead center) versus the volume in the chamber when the piston is at TDC (top dead center). The higher the compression, the more power you will make, at the expense of other things such as the need for higher octane gas, better tuning, etc.

Bore, in simple terms, is the diamter of the piston/combustion chamber. The GSR stock bore is 81mm. If you want to keep this bore size, then you would look for 81mm pistons. Honda only recommends a bore size of 0.020 inches (or 0.5mm) over on stock sleeves. This gives you a resultant bore of 81.5mm. More than that and you will need aftermarket ductile iron sleeves. They are stronger and can support a bore (in some cases) of up to 84.5mm, which effectively gives you more than a 2.0L engine.

Stroke isn't really an issue unless you need to modify it. You really don't unless you are looking to do something very custom/special. Stroke, in simple terms, is the distance that the piston travels within the combustion chamber. It can be modified with different length rods, a different crank, etc.

You must keep in mind that aftermarket pistons (if you keep the compression numbers the same as stock and the bore the same as stock), aftermarket rods, etc will NOT give you more power. They basically reinforce the engine when extra stress is put upon it (such as that of a turbocharger).

You also speak of "stage 1, 2, 3, etc" camshafts. Keep in mind that the block is the weak point of the engine when you're putting stress on it. The stock head can take LOTS of power. Most people don't even modify their heads much other than throw on some aggressive camshafts. Concentrate on reinforcing your block first if that's what you want to do.

You can look into:
1. Pistons
2. Rods
3. Good rod bolts
4. Sleeving or blockguard
5. Good bearings
6. Block girdle
etc etc etc.....

Know that the names "Stage 1, Stage 2, etc" don't really mean anything. Every manufacturer calls their camshaft series something different. A Stage 2 Crower camshaft will definitely not be the same as a Stage 2 Toda cam.

 

I have a 99 GSR 4 door and I went with the stroker kit with eagle pistons and toda B spec sticks
I also went with toda cam gears as well. I would guess i am puttin 223 to the front wheels

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ricebegone13 &raquo;</TD></TR><TR><TD CLASS="quote">I have a 99 GSR 4 door and I went with the stroker kit with eagle pistons and toda B spec sticks
I also went with toda cam gears as well. I would guess i am puttin 223 to the front wheels</TD></TR></TABLE>

223 whp with a stroker kit and cams, eh?

 

thanks.... for all the help and helps... thanks...peeps BUMP