I will go into more detail of why CTR pistons are not ideal at a later time (prob tomrrow). i would go with PR3 pistons, they yield highercompression that a ITR pistons and they are cheaper.
I will go into more detail of why CTR pistons are not ideal at a later time (prob tomrrow). i would go with PR3 pistons, they yield highercompression that a ITR pistons and they are cheaper.
IMO PR3 pistons will make more power than CTR pistons and ITR pistons. In an all motor car you want a even flame front with as little turbulence as possible. You dont want to split it, and that causes the motor to scavenge, and volumetric efficiency drops, making the motor less productive and efficient, power decreases. in a nutshell, ill draw graphs to explain this later tonight
so I should just go with pr3 pistons? thats the first time I ever had someone tell me to go with b16 pistons in my motor, everyone is always like get ITRs or CTRs.
As promised here is my graph. THESE ARE NOT TO SCALE, but a good enough representation.
This graph (LEFT) depicts a PR3 piston. Notice the much flatter dome. what this does is when air is coming down the intake manifold, and is let into the combustion chamber, it has a more direct shot across the piston to the exhaust. There is less turbulence, IE air trying to push back off the dome of the piston , the air flows more freely, etc. Also, the FLAME FRONT which is the explosion that happens when the air and fuel meet in the combustion chamber is ignited by the spark plug. the "explosion" is distributed evenly across the top of the piston.
The Next Graph(RIGHT) is a CTR piston. the higher dome DOES give you higher compression. that is true. However, look at the AIR TRAVEL on this graph vs the PR3 piston. there is MUCH more turbulence. Also notice how the Flame Front is split in two, that means less effciency.
Volumetric Effciency is essentially how well the motor runs. Most honda motors run above 100% VE if built right. You cannot make more power without more air, and the air must flow freely. A motor will run longer and last longer and be more efficient with proper air travel and combustion effciency.
PR3 Pistons will yield around 11.6:1 in a GSR motor
ITR pistons will yield around 11.0:1 in a GSR motor
CTR pistons will yield around 12.9:1 in a GSR motor
That's not a graph, it's an illustration! lol. Sorry, I had to do it. I'm impressed by your "graphing" skillz Mike, I didn't know you were such an artist! lmao!
you cannot run CTR pistons in an LS block with a GSR head. the combustion chamber of a GSR head is too small, the piston dome on the CTR piston will hit the head. eventually itll pound the rod bearings out and rip the wrist pin out of the piston.
get a b16 head, r get rid of those pistons. compression will be very high, look at the 1st page of this thread. its around 13:1
P72 head/B18A/B Block
STD = 13.170743903246784
.25 OS = 13.236528215133324
yea i seen that, and stover told me it's not good to be over 12.5 or somethin like that.....well b16 head it is....it wont hurt anything to run itr cams will it?
would a ctr head be ideal, since ctr heads are obviously meant to be used with ctr pistons? cause i wanna run either itr or ctr cams anyway..
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