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A friend of mine was at the nopi race in dallas with his all motor car and noticed Norris(K powered insight) broke often.He mentioned that it was crank realted and that the crank was twisting with that much rpm.Im not sure as too how much truth is in this,as I have been working with K motors since 2002 and they seem to be much stouter in every area than the B engines.But also mentioned to me about about the crank skunk was running and that they rarely ever break.
Question is,are the K series crank weak when it comes to high rpm?Ive never taken one that high with as much power as Norris put's out.
 

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I know for a fact that the k24a /k20a crank are strong and can take a lot of abuse.

In the drag races, a lot of things can be assumed.

Looking at Norris results this past weekend

Qualifying Order

Order after round 1

1 Charles Madrid Acura RSX 9.897 136.04
4 Norris Prayoonto Honda Insight 10.450 103.91

Order after round 2
1 Charles Madrid Acura RSX 9.897 136.04
7 Norris Prayoonto Honda Insight 10.450 103.91

Order after round 3
1 Charles Madrid Acura RSX 9.885 135.20
2 Norris Prayoonto Honda Insight 9.979 134.12

As you see the insight run fine in qualifing

Now look at Elimination results

Results after Round 1
Charles Madrid Acura RSX .430 9.937 133.91 Winner
Philip Wong .616 11.821 116.80

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Norris Prayoonto Honda Insight 1.271 15.804 66.48 Winner
David Aiwose Honda Civic BROKE BROKE BROKE


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Results after Round 2

Charles Madrid Acura RSX .322 10.013 133.63 Winner
Chad Barber Honda Civic .330 10.572 126.48


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Norris Prayoonto Honda Insight .250 14.604 64.02 Winner
Clay Sloan Honda CRX BROKE BROKE BROKE

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Results after Round 3
Charles Madrid Acura RSX .322 10.013 133.63 Winner
Erick Aguilar Honda Civic .330 10.572 126.48

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Norris Prayoonto Honda Insight 1.024 12.529 100.22 Winner
Saul Salceda Acura Integra BROKE BROKE BROKE

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Results after Round 4
Charles Madrid Acura RSX .371 9.971 135.44 Winner
Norris Prayoonto Honda Insight .232 11.831 103.61

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As you see the insight did not get a chance to run till the last race, therefore identifying a problem in high rpms.. maybe bad bearings? who knows. These crews are spending major $$$ in R&D and next season will be one to watch for sure. I am pretty sure that high 8s will come soon.
 

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yeah problems tend to appear in engines that are being beat the fuck on constantly. remember, these engines were built by honda to be daily drivers, and second, on most of these drag cars, the only thing thats 'honda' about them is the engine casting... just my .02
 

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LSVtec92Hatch said:
yeah problems tend to appear in engines that are being beat the fuck on constantly. remember, these engines were built by honda to be daily drivers, and second, on most of these drag cars, the only thing thats 'honda' about them is the engine casting... just my .02
Norris uses a honda crank, but the bearings are the weak link. I had the same problem with my K23.
 

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I had some azzwipe come today buying parts from the salvage yard. Talking began and all i remember was his main statement that was "i heard k series crank are weak" I was like uhh wtf you say. If they were weak you would hear more about it. Can anyone confirm this? Kinda pissed me off, but laughing at the same time. Probally just hatin because they don't have a K.:down:
 

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Honda Crank weak rofl :p

I used to take my b16b to 9500 just to get it moving didn't have any problems. stock redline was like 8900!!
 

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chunky` said:
weak? no. when's the last time you heard of one breaking or when's the last time you heard of crank walk?

bearings tend to get beat the hell up though.

There is a turbo a3 that had crank walk on ephatch...
 

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excess play in the crank bearings can cause the crank to travel ("walk") back and forth along its axis of rotation in the block, eventually wearing out the bearing housings and potentially damaging the block itself.

k-dub - yeah, well I am 6'7" and I drive a DC5...plenty of headroom. Probably the tallest RSX owner.
 

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Good lord! I believe you are right. I feel sorry for anyone that would have to sit behind you. But back to the subject. I believe people are not looking at the facts here. If you hear of K cranks being "weak", then it would've happened to many k motors. These guys are pushing the envelop on these motors and something has to break. Now if there were plenty of cases where k-cranks would break under lightly boosted cars, then maybe but a lot of guys are pushing it past 9-10 psi and this is even on stock rods....I feel sorry for the rods...poor little twigs...hehe

Honda cranks are strong enough. If it was weak, there would be plenty of aftermarket companies trying to get into the crank biz.
 

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EvaUnit01 said:
excess play in the crank bearings can cause the crank to travel ("walk") back and forth along its axis of rotation in the block, eventually wearing out the bearing housings and potentially damaging the block itself.

k-dub - yeah, well I am 6'7" and I drive a DC5...plenty of headroom. Probably the tallest RSX owner.
I meant no disrespect, just tying to light up the room. Got to love the Honda
 

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k-dub - no worries, you didnt "dis" me or anything. I am a giant...sort of

yes, the rods are one of the weak points of the car, as well as the oil process and oil pressure. as per hytechs discussion, the i-VTEC system does have drawbacks b/c of the speed of the crank due to VTC. If anyone is going to build a motor, the rods and oiling system are the 2 top priorities to iron out first IMO.
 

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Couldn't have said it better. I'm sure since a lot of information is out now about the oiling system, there will be plenty that will implement it and we'll start seeing 9000+ rpms on street cars.....I love the "k"...
 
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