rod knock

[Josh240sx]

ok so i have developed rod knock in my ka24de which sucks but anyways i was just wondering i maybe someone would want to help with some ideas on what to do. so far this is what i have thought might be good i have another ka sitting in my shed in the backyard the problem with that is it has high milage but the rods dont really have any wear on them so i was thinking just take those out and replace the bad rods i have now (and while being out go ahead and put some high compression pistons on them as well.) but anyways i was just wanting some input telling me if that idea is a good one or not recommended ? thanks for any help or advice you can offer -Josh

[liquid_cool]

Josh..how ya doing..i have a few idea's for you to start with..#1.) have your cranck check'd..you might have an issue with it.#2).allso..look at your main area and see if ya spun any bearings.#3)are you shure your rods are toast?...these are the first things i would do...when i mean have your crank lookd at..i mean (magnaflux'd) thats a excellent way to find any hidden fatal dmg to a crank...while its at the shop...have it balanced/knifed and trimd..a little lightening will help throttle responce...remember that the ka24de has a half balanced crank..so balancing just the crank will help..a really good shop will ask you for your rods..rings..bearings.ect..to do a proper balance..you can rebalance if ya want to go that route later (might have to explain the crank to some shops as they dont see ka24's that often)...plan your build bro..do ya want to turbo later?..if so {9.5:1} or even {9.0:1} is cool if ya have head studs and a b0mber built valvetrain...take some time and ask yourself your target HP and think on it some..inspect with magnification if ya can your crank and main area..get back to us here..and will throu more advise at ya..good luck.

http://www.myspace.com/liquid_cool_ka24de

[480sx]

If you have rod knock you have crank damage. The rod itself is not always damaged by rod knock, the crank however is. Failed bearings are the most common cause of rod knock. Stretched rod bolts also will cause this.

With a Ka thats knocking, your better off just buying another Ka and swapping it in.

Liquid.. Hmm... just a few quick things. Magna flux finds cracks, crank shafts dont really crack. A half counter weighted crank shaft doesnt mean its not balanced. It means that it has half the balances(counter weights) on it that a fully counter weighted crank shaft has. It is still quite balanced.

[Josh240sx]

Josh..how ya doing..i have a few idea's for you to start with..#1.) have your cranck check'd..you might have an issue with it.#2).allso..look at your main area and see if ya spun any bearings.#3)are you shure your rods are toast?...these are the first things i would do...when i mean have your crank lookd at..i mean (magnaflux'd) thats a excellent way to find any hidden fatal dmg to a crank...while its at the shop...have it balanced/knifed and trimd..a little lightening will help throttle responce...remember that the ka24de has a half balanced crank..so balancing just the crank will help..a really good shop will ask you for your rods..rings..bearings.ect..to do a proper balance..you can rebalance if ya want to go that route later (might have to explain the crank to some shops as they dont see ka24's that often)...plan your build bro..do ya want to turbo later?..if so {9.5:1} or even {9.0:1} is cool if ya have head studs and a b0mber built valvetrain...take some time and ask yourself your target HP and think on it some..inspect with magnification if ya can your crank and main area..get back to us here..and will throu more advise at ya..good luck.

http://www.myspace.com/liquid_cool_ka24de

dang thanks for taking the time to type all that. but yeah i was researching today and found out i needed to get the rods and crank im kind of new with this internals stuff. i can do the basic bolt ons and know somewhat but im still in the process of learning. im not sure if i want to turbo or not i would like to but at the same time i would like a NA that could walk a turbod car lol.

[liquid_cool]

If you have rod knock you have crank damage. The rod itself is not always damaged by rod knock, the crank however is. Failed bearings are the most common cause of rod knock. Stretched rod bolts also will cause this.

With a Ka thats knocking, your better off just buying another Ka and swapping it in.

Liquid.. Hmm... just a few quick things. Magna flux finds cracks, crank shafts dont really crack. A half counter weighted crank shaft doesnt mean its not balanced. It means that it has half the balances(counter weights) on it that a fully counter weighted crank shaft has. It is still quite balanced.

we may not see eye to eye on this....but its just pointing him in the rite direction..we can argue all day long on how to start someone off in this world...or we can team up to train him corectly..any builder knows to mag a crank the moment you get it..i just pointed that out to him..any builder knows to check bearing area's..i just pointed that out to him allso...there are to many people passing on crap to other people in our area of tuning...if we train as many as we can to do a decent job..it will maximise the numbers of compeditive racers out there..and maximize the numbers of well maintaind long and short blocks availible to us all..

[480sx]

Hey Zero you were right though about the Maging the crank, i have never heard of a machinist doing that but from the little research i just did some machine shops do offer that service. I know mine didnt recommend it and he knows his stuff, hes been a machinist for 35 years. I still cant see how they would crack, apparently its a very uncommon thing but it happens.

[liquid_cool]

ya they do crack...i help some of my buddys as a slave come drag night here in vegas..seen many a destroyed crank...its not as rare as ya think.

[480sx]

Seen my fair shair of destroyed cranks but, never one that was taken out by a crack, or a crank that just had broken.

[liquid_cool]

ive seen a few bent..then run on race night anyways (some racers dont care when there sponsored) and the crank spins a bearing ,locks up and snap!..con rod throu a block..and its tow to the pit..in drag racing its common..at least once a night you see that on test and tunes...as far as the ka crank...there not a high quality crank..and id mag test em everytime for hairline flaws and casting imperfections....but thats me.