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PISTON SPEED k24a vs k20a/a2

7.1K views 7 replies 8 participants last post by  A L I A S  
#1 ·
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the lines represent where honda placed the rev limiters from the factory.

Piston speed in a function of RPM and stroke only.

TO find out the piston speed --> Piston Speed = stroke in inches x RPM /6

I was trying to figure out what to set my tsx motor to so I made this graph to get an idea what kind of abuse are these honda OEM pistons supposed to take.... As you see.. even at 7100, the speed of the k24a piston is almost the same as teh k20a at 8000 RPM.. Just something to think about before deciding to see how much power your motor will make at 9000 rpm lol
 
#3 ·
So the stock redline for the K20a2 is 8600 right?

so the K24 would have the same piston speed at about 7500-7600?
 
#4 ·
The stock redline of the A2 is 7800, 8600 for the K20A.

It's very interesting to see this, as i've been revving my K20A to 9k for quite a while with no problems. Judging by that graph, if piston speed is the only issue, then the K24's should be able to take 7800ish.
 
#7 ·
Because of the longer stroke of the K24, will the side load in the upper RPMs contribute to a possible failure? Or will the increased friction only hurt power up top? The sleeves will be one of the last things to fail, right? What I'm trying to ask is:lol will the increased side load put more stress on the piston/rod combo, thus contributing to failure?
 
#8 ·
kevinoneill said:
Very good info Nikosaurus

Dark Blue = k24
Pink = k20

i'll be linking to this for my soon to be wonderful k24/k20 frank sticky :D
lol, you called him nikosaurus...:p
cant wait to see your frank thread:up: it will help me alot for when i do my build:up:
also, i dont think theres any way in hell the sleeves are gonna go on a mild all motor build! these stock sleves have been known to take alot of boost :up: