What do you need to do to a honda motor to make it a high rev engine? I have an JDM H23A and would like to raise the stock rev limit but i dont want to destroy my bottom end. I know building the head with cams and titanium springs and retainers will handle up to 8000. But what if I wanted to go higher? Is Vtec the only reason why the h22 can handle such high rpm's? Any info will be much appreciated.

 

get a B series

 

Yea man I agree with E-Money just get a B Series or a K Series The H motors just aren't really made for high reving...

 

I dont think they make titanium springs, only retainers and most opt for using stronger ones that are more reliable. There are alot of articles of people having fatigue ware after 20k miles or so on the Ti retainers. You need alot of research. Yes the H22 can be built to rev to 8k reliable but it takes some money to get there. H23 however uses a different crank and different compression / stroke, so building that to rev to 8k would take some money and lots of it. I wouldn't waste time on that just swap an h22 and your way closer to your goal of reving. If all your worried about is revs go get a motorcycle and rev to 10k all day, even if your h23 could rev to 8k you would probably wouldnt make power that high. just my 2.3cents.

 

carrillo ultra light weight rods/ or probe ultra light weight rods
endyne oil pump
balance and you should be good up till 9500 rpms
but it doesnt mean you will make power up their.
i think the intake manifold chokes the engine in the high end
due to the runner being sooooooo long

 

A B or K series has nothing to do with being able to rev high, the reason why these motors can rev so high is because they have a shorter stroke than the H22/23. Ofcourse other factors come into play like head build ect, but i general the bigger the stroke/bore the less it will be able to rev up. Look at the SK2 for example, when it came with the 2.0 it could rev up to like 9k, now they are running the 2.2 but the revs dont go as high. Thats why B series have no torque either. I could be wrong here, so someone with better knowledge could shine some light.

 

those k24 are spinning to 9000 + rpms
and the have some very long strokes

 

to build a good high revving motor, your motor not only has to mechanically capable, but it also has to be setup in a way in which it will make power at those rpm. On the mechanical aspect, the motor would need all new valvetrain and bottom end and fully balanced rotating assembly. A smaller stroke would be helpful, such as an F20a or F20b crankshaft. At the very least some decent friction coatings on the pistons and oil squirts would be imperative for better lubrication but mainly cooling the pistons especially at higher rpm. Also very precise tolerances would be crucial.

And to actually make power that high would require a new intake/intake manifold/itbs, oversized valves would be beneficial, a very high lift cam, a header with a 4-1 collector at least 2.5" and a good tune. And to take advantage of that motor you would need a new final drive also. There is alot of work involved and its probably not realistic for the average person

 

8500RPMs is where my setups dies with JUN cams.
Just curious why you'd want to rev so high?
Wouldn't you rather have usable power?
Another 10,000RPM street machine...lol

 

are you running the stock intake manifold with those jun cams?

 

I know head bolts and a good valvetrain are a good idea. Not sure how high you can rev and not blow your motor up but I rev it to 7800 every once and a while since the stock rev limiter cuts me off there.

If i didn't have the head bolts and valve train i wouldn't trust it to go even that high.

P.S. I have an h22

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Revi &raquo;</TD></TR><TR><TD CLASS="quote">A B or K series has nothing to do with being able to rev high, the reason why these motors can rev so high is because they have a shorter stroke than the H22/23. Ofcourse other factors come into play like head build ect, but i general the bigger the stroke/bore the less it will be able to rev up. Look at the SK2 for example, when it came with the 2.0 it could rev up to like 9k, now they are running the 2.2 but the revs dont go as high. Thats why B series have no torque either. I could be wrong here, so someone with better knowledge could shine some light. </TD></TR></TABLE>

Revi is exactly right. A wise person on H-T once said if you want horsepower: Rev it. If you want torque: Stroke it.

Look at 1.6 and 1.8L engines. They have a "shorter" stroke thus you can benefit from reving the engine higher creating more horsepower.

A lot of people complain that the H23 crank is "weak." IMO you should have the H23 crank balanced to 8-9000rpm's. This would be a great help. This in addition to cams that will allow you to make power in this range (Skunk2 Pro2). You will also want your block sleeved, lightweight pistons, rods...

 

For reference look at Honda F1. The car is a V-8 with ONLY 2.4L!!! It revs to 19,000 rpm's.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by alterdcreations &raquo;</TD></TR><TR><TD CLASS="quote">carrillo ultra light weight rods/ or probe ultra light weight rods
endyne oil pump
balance and you should be good up till 9500 rpms
but it doesnt mean you will make power up their.
i think the intake manifold chokes the engine in the high end
due to the runner being sooooooo long
</TD></TR></TABLE>

how much does the carrillo rods run.. and where could i get them? sorry to jack the thread but i couldnt pm the guy

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dougk1401 &raquo;</TD></TR><TR><TD CLASS="quote">Yea man I agree with E-Money just get a B Series or a K Series The H motors just aren't really made for high reving...</TD></TR></TABLE>

I beg to differ....... I myself have built many h22's that make power up to 9500rpm on the average. One was even close to the 10k mark. Everything comes down to how balanced the motor is. Balancing is KEY when it comes to building a high reving, high hp motor.

 

he is running a h2b set up
my moter can spin to 8500 rpms but i wont take it their untill i get a ati dampner
i am using f22 rods with gsr rod bolts

 

if i picked up some probe rods i would spin untill 9000+ if i made power up their

 

im doing this on a cut and balanced crank factory crank pulley! and on h23 rods and crank! you dont need much to get a motor reving high. just a good balancing job.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote">im doing this on a cut and balanced crank factory crank pulley! and on h23 rods and crank! you dont need much to get a motor reving high. just a good balancing job. </TD></TR></TABLE>

True, but you still can't ignore pistons speeds if you want to rev really high...no matter how balanced it is. I certainly don't claim to be an expert or anything, just something to think about.

 

dude i already told you the answer to this on preludepower.

ingredients:

1x Japanese midget.

 

i am also running the oem pully but i am also running the oem valvetrain so thats my limit for now

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote">

I beg to differ....... I myself have built many h22's that make power up to 9500rpm on the average. One was even close to the 10k mark. Everything comes down to how balanced the motor is. Balancing is KEY when it comes to building a high reving, high hp motor. </TD></TR></TABLE>

Congratulations, you are one of few who has accomplished this.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98vtec &raquo;</TD></TR><TR><TD CLASS="quote">dude i already told you the answer to this on preludepower.

ingredients:

1x Japanese midget.</TD></TR></TABLE>

dont forget

2x JDM Road flares

1x tub of vaseline

just light em and slide them up the Japanese midget's (use your imagination here) and (again, imagination) and make the midget dance


Man what a horrible thread

 

and a jdm new driver sticker on my bumper = 5 mental hp on that upgrade! dyno proven!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by AllMotorRandy &raquo;</TD></TR><TR><TD CLASS="quote">and a jdm new driver sticker on my bumper = 5 mental hp on that upgrade! dyno proven! </TD></TR></TABLE>

that would be a crazy dyno graph.

i bet if you plot out the numbers, it would look like this: ^_^

but really big.