Im trying to figure out if it is worth it to build the k24 motor up with high compression pistons with the k24 crank right now.... Im a little worried about the rod ratio... If i got strenthen rods and pistons, will the motor still be cool? and be able to rev a little bit higher in RPM's? or should i get a like a 92mm crank and get rods that are a little bit longer? or what would you do if you had the motor?

 

I don't know the answer to your question, but I would love to see more k-series motor build ups on here. I'm sure they will be gettin more and more popular soon!
bump!

 

bump for more information here

 

bump! Somebody help this guy out!

 

i'm wondering what you're going to do with this motor? 13.5:1 is race gas only. plus you think the stock cam is going to be effective with that CR? U R way ahead of yourself. the 99mm stroke in the k24 makes for some VERY high piston speeds at revs past stock redline. plus, cams again. they aren't going to breathe at 8k. rod ratio makes sense, but only when you are matching the rest of the stuff.

we just dyno tuned a crv motor in an EF. it was all stock except the header, which it had to have because of the swap and it did 165 hp and 165 ft/p on a dynapack in 4th gear with a K-pro. might not sound impressive, but that car PULLED from 60-80 in 4th gear on the street like it had a turbo.

go back and figure out things besides pistons. until someone finally comes out with a cam for this motor, we're not going to get much out of it. and without a cam, your other mods will only do so much. get an A2 head and put it on there.

my .02

 

Any pics of the EF?

 

my post was about a k24 with a k20 head... your suggestions are correct... but i am asking if the rod ratio will be fine with stronger rods adn pistons... that in consideration with work done to head all ready with cams and stuff like that.... im just talking straight bottom end.. and yes this is a race car, so i def. know that this will be running on race gas only

 

The k24 r/s is 1.54,the same as a b18a/b.The main reason why you cant rev it too high is because the stroke is so big.Revving to 8500rpm the piston speed will be 5500rpm...on a type S engine you have to rev it to almost 9800 rpm to have that same piston speed.High piston speed wears out pistons skirts and piston rings..not to mention various other engine parts.

 

if you can tell me how to post an image of the dyno i post a dyno of the k24. if you mean engine shots, look at july honda tuning. swap was into integra, but it's really no different for ef.

for 2FastxEg, what i'm saying is that none of this stuff is out there unless you are making cams for this car, then i'm really interested. but if so, you need a new intake manifold too. and if you're doing that, then i'm even more interested. but JDMotive is right on. even if you beef up the rods to handle it, the piston speed is way too high.

if you want more rpm from this motor you will have to change up the crank and rods for better rod ratio to slow down the piston speed.

.02 more

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMotive &raquo;</TD></TR><TR><TD CLASS="quote">The k24 r/s is 1.54,the same as a b18a/b.The main reason why you cant rev it too high is because the stroke is so big.Revving to 8500rpm the piston speed will be 5500rpm...on a type S engine you have to rev it to almost 9800 rpm to have that same piston speed.High piston speed wears out pistons skirts and piston rings..not to mention various other engine parts.</TD></TR></TABLE>

i agree. the sideloads on the cylinder walls are what you should be more worried about with that large crank and rod ratio.

 

Ok.... dont know if you guys have an answer for this... beleive me im trying to think this out thoroughly... but check this..... if both motors can put out 300 horsepower and reving the k24 to he max at 8500 rpm and the k20 at 9800rpm, it would be the same thing basically, the only difference is that the k24 will get out of the hole quicker because of the overall torque.. you guys agree on that?

 

by the way, this motor has a set of itb's and 13:5-1 cp pistons coming.... its the rest of teh set up i am thinking of

 

The k24 will have more HP potential and definately more torque than the k20,it just wont rev as high reliably.For example,a SB 350 will only rev to 6-7k on a built street type motor,but will still have a ton of power and be semi reliable.You dont necessarily need a ton of rev's to have a fast car and alot of power.If the engine makes good power without revving to 10k than theres nothing wrong with that.I believe the k24 will have 350+whp potential.Its just that with the large amount of torque the k24 will have compared to the k20,youll have the ability to run bigger slicks which = more traction and better 60' times.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ownercarry &raquo;</TD></TR><TR><TD CLASS="quote">for 2FastxEg, what i'm saying is that none of this stuff is out there unless you are making cams for this car, then i'm really interested. but if so, you need a new intake manifold too. </TD></TR></TABLE>

Why would you need the new Intake mani?

I think if you are trying to rev this thing any higher than the stock red line you are going to need a new crank.