Just sorted me a crv k24a block. Heard that the k24a2 tsx cranks are counterweighted and better for higher rpm (witch is what im going for). Are these crankshafts interchangeable or is there some other rout im missing with having a stronger better crank? also heard that getting rid of counterbalance will help out with better top end performance at higher rpm?
watson1306
I am not aware that they are much different at least from their shape. Removing the counterweights on an inline-4 crank is in 99% of cases a very bad idea, even more if that engine is supposed to reach higher rpm levels.
AFAIK the k24 cranks are largely the same. The TSX cranks were made in Japan while the others were made in the USA, hence different part numbers.
The TSX cranks were nitride coated.
Here some minor differences are described:
www.k20a.org
Overall I'd say unless you plan to build a monster 600 wHp high rpm Turbo monster engine, I'd not bother.
Higher rpm are not a good idea on a K24 anyhow unless you can life with a lower life span.
I'd also recommend having the rotating bottom end balanced if you intend to rev this k24 rather high.
Weight match all pistons and pins
check con rod balance
have crank, flywheel and pressure plate balanced as a combination.
Then there is a balance shaft set-up integrated in the k24 oil pump. You might want to replace it with a non-balanced shaft equip k20a2 oil pump. That indeed reduces losses a bit, but for the price of higher 2nd harmonic vibrations. The balance shaft set-up is also not that good for high rpm operation.
What rpm limit do you intent to hit?
How do you want to get there?
The cast stock pistons and rods won't like anything near 8k not for a long time.
AFAIK the k24 cranks are largely the same. The TSX cranks were made in Japan while the others were made in the USA, hence different part numbers.
The TSX cranks were nitride coated.
Here some minor differences are described:
Difference between various K24 cranks? TSX, Accord, etc.
I'm just wondering if there are any differences between the TSX crank and the Accord cranks in the K24s. There is a huge price difference between the two and I need a K24 crank for a stroker motor that I'm building for an S2000. Obviously, I know the stroke is the same for both but I'm curious...
www.k20a.org
Overall I'd say unless you plan to build a monster 600 wHp high rpm Turbo monster engine, I'd not bother.
Higher rpm are not a good idea on a K24 anyhow unless you can life with a lower life span.
I'd also recommend having the rotating bottom end balanced if you intend to rev this k24 rather high.
Weight match all pistons and pins
check con rod balance
have crank, flywheel and pressure plate balanced as a combination.
Then there is a balance shaft set-up integrated in the k24 oil pump. You might want to replace it with a non-balanced shaft equip k20a2 oil pump. That indeed reduces losses a bit, but for the price of higher 2nd harmonic vibrations. The balance shaft set-up is also not that good for high rpm operation.
What rpm limit do you intent to hit?
How do you want to get there?
The cast stock pistons and rods won't like anything near 8k not for a long time.
Hay thanks for the helpful info. I would love to reach around 500hp at the crank but after further research I'm thinking 400hp is more realistic for my budget. I specifically got the crv block because I heard that you can bolt the k20 oil pump straight on without having to cut it to fit.
I always had an impression that these motors build correctly could Rev over 9k. So I was hoping to have a limiter of about that give or take a 1k depending on how the build goes. I am planning on having a turbo build as I believe is the cheaper option to get more hp out of the motor.
Also looking at after market pistons rods and rings. But I head that the sleeves tend to not like forged pistons all to well, heard this when looking into getting je pistons. Also with after market I was looking into how to balance the compression and boost as to get the most efficiency out of my motor. Heard that a 9.1 ratio is the go for turbo? Do I need to sort what turbo and boost I am going to run before instaling and balancing the bottom end?
I'm new to k series and have been trying to soak up as much as I can before I build my own and just slap one in my eg without knowing how it is going to run and the capabilities I've set for myself.
I always had an impression that these motors build correctly could Rev over 9k. So I was hoping to have a limiter of about that give or take a 1k depending on how the build goes. I am planning on having a turbo build as I believe is the cheaper option to get more hp out of the motor.
Also looking at after market pistons rods and rings. But I head that the sleeves tend to not like forged pistons all to well, heard this when looking into getting je pistons. Also with after market I was looking into how to balance the compression and boost as to get the most efficiency out of my motor. Heard that a 9.1 ratio is the go for turbo? Do I need to sort what turbo and boost I am going to run before instaling and balancing the bottom end?
I'm new to k series and have been trying to soak up as much as I can before I build my own and just slap one in my eg without knowing how it is going to run and the capabilities I've set for myself.
I‘d not rev a k24 to 9k unless you build a pure drag racing engine. For a turbo there is no need to rev over 7.5k. For 400HP and a DD, you don‘t even need to build the engine. If you do circuit track driving, you need a baffled sump and widen the ring gaps. that‘s it.
The piston speeds and the piston accelerations get insanely high for a 99mm stroke engine like the K24.
at 8k, you‘ll already at NASCAR and F1 levels. 9k and you’re beyond that.
If you want 9k, build a k20.
Actions starts at about 3 minutes. This build has about 500HP and runs on full aero and slicks.
Spend some time here searching and reading threads of the various turbo builds that were posted here over the years.
Post 400HP and the associated torque, sometimes depending on use even before, you‘ll run into gearbox issues as well.
The piston speeds and the piston accelerations get insanely high for a 99mm stroke engine like the K24.
at 8k, you‘ll already at NASCAR and F1 levels. 9k and you’re beyond that.
If you want 9k, build a k20.
Actions starts at about 3 minutes. This build has about 500HP and runs on full aero and slicks.
Spend some time here searching and reading threads of the various turbo builds that were posted here over the years.
Post 400HP and the associated torque, sometimes depending on use even before, you‘ll run into gearbox issues as well.
Hay thanks for the info. Exactly what I was wanting to know. I've been doing a lot of research and hearing different things about this motor.
I would like to build one just for the fun of it, just wanted to know the realistic capabilities of a semi low budget build. I believe I have to swap the pistons for a crv block anyway. Want a build that I won't have to open up hopefully at all once I'm done. That's why I thought I'll start from scratch.
Just recently discovered this forum so I'll have a dig like you said. I appreciate the feed back
I would like to build one just for the fun of it, just wanted to know the realistic capabilities of a semi low budget build. I believe I have to swap the pistons for a crv block anyway. Want a build that I won't have to open up hopefully at all once I'm done. That's why I thought I'll start from scratch.
Just recently discovered this forum so I'll have a dig like you said. I appreciate the feed back
they are pretty much exactly the same, like lotus said. if you're in the market for a K24 crank, I happen to have 2 in my possesion right now, though the journals do need to be measured first
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