[danno]

hey guys putting together an Frankenstein, k24a4 bottom end and k20a2 head tried the search function and looked around on google but couldn't really find the answer im looking for, my question is can I safely rev this engine to 9k. the bottom end is completely rebuilt parts are as follow

k24a4 short block
-eagle H beams
-wiseco forged pistons
-acl race bearings
-DC5 S oil pump/chain/guides (brand new)
-DC5 R oil pan
-k24a4 timing chain/guides (brand new)
-cometic head gasket
-ARP head studs
-darton flanged sleeves

k20a2 head
-Ferrea 5000 Series Valvetrain
-S10099 Dual Valve Springs
-E11066 Titanium Retainers
-SL1052 Spring Seat Locators
-K10034 Radial Groove Keepers
-Ferrea 5000 Series Special Alloy Valves
-Manganese Bronze Valve Guides
-Ferrea Viton Hi Temp Valve Seals

so based off what I presented you guys with back to my question, can this engine take the 9k redline, this engine is gonna be in a daily driver (summer toy) might see some track time, apart from that it most likely wont be beaten on regularly. any help from some knowledgeable members would be great.

 

[brakaT]

Why set a redline of 9K? I see no mention of cams? Piston speed on a K24 @ 9K is ridiculously high.

 

[JuicyJoint316]

yeah 9k on a K24 is asking for trouble. Dont care if its fully built or not..

Should do a K20 and stroke it to a 2.2L that would be more safe.

 

[SickSilver_ep3]

Why set a redline of 9K? I see no mention of cams? Piston speed on a K24 @ 9K is ridiculously high.

even if it was stock cams do you think going to 9k would slow him down?


how many 9k rpm k24's have you owned?

yeah 9k on a K24 is asking for trouble. Dont care if its fully built or not..

Should do a K20 and stroke it to a 2.2L that would be more safe.

a 92mm stroke k20 has a 1.52 R/S ratio

a 99mm k24 has a 1.53

 

[brakaT]

even if it was stock cams do you think going to 9k would slow him down?


how many 9k rpm k24's have you owned?

I don't need to own any to know that's dumb af to rev a K24 to 9k for a "daily" that will not see any drag time at all or very minimal as mentioned. I'd think it would be safety/reliability over performance for a daily/street car.

Why stress the motor when it's not needed?

 

[SickSilver_ep3]

OP the big thing that jumps out at me is the eagle rods. if anything is gonna fail its the rod setup.


is it good for the motor? ofcourse not. do 90+% of people with similar builds crack 9k+ daily in their motor with minimal failures? yep.


will people with no experience say the piston speed and stress is too high? yep

 

[brakaT]

OP the big thing that jumps out at me is the eagle rods. if anything is gonna fail its the rod setup.


is it good for the motor? ofcourse not. do 90+% of people with similar builds crack 9k+ daily in their motor with minimal failures? yep.


will people with no experience say the piston speed and stress is too high? yep

MBN to know it all and done it all :new_slayer:

Rev it to 9K OP, it'll be no prob says the guru.

 

[SickSilver_ep3]

MBN to know it all and done it all :new_slayer:

Rev it to 9K OP, it'll be no prob says the guru.

never claimed to know it all. dont get so mad.


go to an east coast event and it will blow your mind how many people with shit built k24's are running in the 10.50 index or 11.50 revving the piss out of their motors and have been for a long time(years). im talking about stock tsx bottoms getting close to 10k rpms. WOT shifts, miss shifts ect. makes 9k every once in a while in a good built engine seem like nothing.


alex pagan was the IFO points champion in his region running 10's in a 99 stroke setup with 13.7:1 wisecos and STOCK tsx rods with skunk2 cams. Would love to see a thread asking if that setup is any good lol.

10K for two years and the motor got hurt pushing the VTC too far.




all im saying is whatever the OP is gonna do isnt going to compare what others have. If he wants to go to 9k sometimes MOST LIKELY itll be fine. if youre super scared set the limiter at 7500 and dont worry about it. if you want to except the risk go to 9k and hope for the best. any modified engine can fail and if it does its probably not a direct result of seeing 9 grand a few times.


you can do all the math formulas you want. make all the threads and get responses about camshaft lift and duration and the intricies of engine building but most of those people get obsessed with "research" and parts matching that havent done any of it in the real world.

 

[JuicyJoint316]

Doesnt matter about once in a while it matters about the k24 isnt meant to rev that high period. Yeah Norris might builds your engine or tunes it or whatever he does how many times each pass does it put stress on the motor? How many times are you guys tearing apart that motor checking clearances just to run at the next event?

I am by no means a drag racer but dude come on you are giving him bad advice for a his only Daily Driver. A perfect example user F-Bomb with his SVM cammed K20 rsx blew his motor on 2-3 passes revving at 9k in the 1/4mile. If the k20 is more safer to rev it to that RPM and blew what makes you think a built k24 will be more durable? Common sense

 

[anthonyfa18]

never claimed to know it all. dont get so mad.


go to an east coast event and it will blow your mind how many people with shit built k24's are running in the 10.50 index or 11.50 revving the piss out of their motors and have been for a long time(years). im talking about stock tsx bottoms getting close to 10k rpms. WOT shifts, miss shifts ect. makes 9k every once in a while in a good built engine seem like nothing.


alex pagan was the IFO points champion in his region running 10's in a 99 stroke setup with 13.7:1 wisecos and STOCK tsx rods with skunk2 cams. Would love to see a thread asking if that setup is any good lol.

10K for two years and the motor got hurt pushing the VTC too far.




all im saying is whatever the OP is gonna do isnt going to compare what others have. If he wants to go to 9k sometimes MOST LIKELY itll be fine. if youre super scared set the limiter at 7500 and dont worry about it. if you want to except the risk go to 9k and hope for the best. any modified engine can fail and if it does its probably not a direct result of seeing 9 grand a few times.


you can do all the math formulas you want. make all the threads and get responses about camshaft lift and duration and the intricies of engine building but most of those people get obsessed with "research" and parts matching that havent done any of it in the real world.

some good info here well said


as for revving that high can the rrc oil pump work ???

 

[SickSilver_ep3]

Doesnt matter about once in a while it matters about the k24 isnt meant to rev that high period. Yeah Norris might builds your engine or tunes it or whatever he does how many times each pass does it put stress on the motor? How many times are you guys tearing apart that motor checking clearances just to run at the next event?

I am by no means a drag racer but dude come on you are giving him bad advice for a his only Daily Driver. A perfect example user F-Bomb with his SVM cammed K20 rsx blew his motor on 2-3 passes revving at 9k in the 1/4mile. If the k20 is more safer to rev it to that RPM and blew what makes you think a built k24 will be more durable? Common sense

what does my norris motor have to do with anything i posted? lol. my race motor is a 102 stroke k20 block that see's 10,500 rpms.. he tries to make 100+ passes before pulling motors if you really wanna know though. if the cheap cranks arent breaking.


your thing about f bombs motor has zero bearing/merit when it comes to this topic. if a k20 fails in 2-3 passes at 9k it for damn sure wasnt because he went to 9k instead of 8500


"more better"

"k24 isnt meant to rev that high period"

says who? honda? we are talking about a modified engine top to bottom

 

[SickSilver_ep3]

some good info here well said


as for revving that high can the rrc oil pump work ???

yes

 

[F-BOM]

fyi, my k20 saw 9k constantly, at least 2-3 times a day and it was a true daily driver. too many passes to count before it blew, not 2-3 passes.

the current k24 only sees 8100 because power peaks at 7500 and flatlines to there. i have no need to rev any higher.

both my engine builder and tuner, who i place a lot of trust in, do not recommend i go any higher. they both know what they're doing.

 

[SickSilver_ep3]

fyi, my k20 saw 9k constantly, at least 2-3 times a day and it was a true daily driver. too many passes to count before it blew, not 2-3 passes.

the current k24 only sees 8100 because power peaks at 7500 and flatlines to there. i have no need to rev any higher.

both my engine builder and tuner, who i place a lot of trust in, do not recommend i go any higher. they both know what they're doing.

you run at the track obviously. even if power flatlines at 7500 (thats odd) make a pass shifting at 8100 and one at 9k. i think itll pick up a good chunk.

 

[F-BOM]

it's not tuned that high so that wont be happening :silly:

my tuner was adamantly against it as well

 

[SickSilver_ep3]

by juicyjoints logic this stock k24a2 bottom end shouldnt have lasted a pass.

 

[F-BOM]

yea these guys are beating on these engines. but how many are legitimately daily drivers? i'm not talking driven once a day, when the weather's good and once a week to the local meets.

i drive my car every single day. take it to work, drive home, and everywhere in between. i drive it when i go out of town 2+ hours and it has to survive. i'm not looking to build the fastest thing on the street, but it's pretty damn quick for what it is.

 

[Acurazor]

Is it really worth it to rev that high on a DD? Unless you're making gobs of power from 8-9k. Why risk it on a daily? To each his own, but if it were my DAILY 8k would be plenty.

 

[anthonyfa18]

by juicyjoints logic this stock k24a2 bottom end shouldnt have lasted a pass.

got the complet spec on that motor also u said that the rrc oil pump can hold 9000 rpm what is the maxmim rpm it can go to ??

 

[Acurazor]

Isn't the RRC and prb oil pump the same? Or am I wrong?