How high could i safely rev to in a prelude H23 once i upgrade to stage 2 cams, valve springs, retainers, and anything else that come with a valve train upgrade? I plan on also having some stronger rods put in, but keeping the stock pistons.

 

You would only need to rev it to where you stop making power. My old boosted H23 stop making power at 6k on stock head. Then when we upgraded the head with springs retainers and cams It continued to make power to 7300. But the big problem with the H23 is the Longer stroke and they like to eat rod bearings, trust me I know. I wouldnt rev any H23 past 7500 period. But the only true way to find out what the best point to rev it to is have it dynoed

 

+1 for Pman92. I've seen people rev past 6500 but not safely. Everyone wants to do it as cheap as possible but that never turns out good. If you want to rev higher build the bottome end just as much as you build the top end. Stronger bolts and washer all throughout the motor will help it hold up to higher pressures as a result of revving higher.

 

So with some stronger rods, bolts and washers, maybe shoot for 72-7300? maybe even just 7000 for safety's sake? and how bout bolts and washers? hard to do? expensive?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dabrybry &raquo;</TD></TR><TR><TD CLASS="quote">So with some stronger rods, bolts and washers, maybe shoot for 72-7300? maybe even just 7000 for safety's sake? and how bout bolts and washers? hard to do? expensive?</TD></TR></TABLE>

If you wanna rev high, why not just go with an h22 block. The crank is designed
so you can do this a lot safer. Invest in some oil squirters if you must
go with the h23 and you plan on revving high.

 

well, without getting it to rev higher, will i really see any power from throwing in cams, rods, retainers and springs? Will it need some extensive tuning?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Dabrybry &raquo;</TD></TR><TR><TD CLASS="quote">well, without getting it to rev higher, will i really see any power from throwing in cams, rods, retainers and springs? Will it need some extensive tuning?
</TD></TR></TABLE>

It depends what kind of cams you get.

I believe Pirate McFread was running cams in his g23/h23 motor.

Shoot him a pm and he can probably help you out.

 

the key to revving an h23 block is ENGINE BALANCING.

mine has seen 8200 rpm.

 

holy ****. I can't even fathom spinning that with an H23. What was done to the bottom end exactly? Did you do it all of the time or every now and again or just a one time deal?

 

What 98vtec said is exactly what I was talking about. "Completely" building the bottom end. That includes balancing and blueprinting any and everything possible to maximize durability at higher rpms.

 

I wouldn't worry about a H23 head making much top end anyway.

 

Any motor is capable of anything, if built correctly.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 92bb2 &raquo;</TD></TR><TR><TD CLASS="quote">holy ****. I can't even fathom spinning that with an H23. What was done to the bottom end exactly? Did you do it all of the time or every now and again or just a one time deal?</TD></TR></TABLE>

only when racing or tuning peak RPM.

my car is babied and I don't street race.

 

Mine also. I only mash it. On SCCA track days, and certain open Drag events.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dk4ever &raquo;</TD></TR><TR><TD CLASS="quote">Mine also. I only mash it. On SCCA track days, and certain open Drag events.</TD></TR></TABLE>
sounds real babied lol

 

AHAHHAHAHHA, no sh*t.

Who even really babies their honda's anyhow. Once and a while your gonna push it.If not why even get a honda.

Get a domestic 5000 rpm max rev and it will fall apart faster even if you shift at 2000 all the time, than the honda would if you beat the **** out of it.

May as well do an h22 swap, and put all that money your sinking into the h23, into the h22. Than you can rev her to probably alot higher than the h23 (not that higher reving means jacksmacksh*t).

The question is, when would you like to stop making power. Unless you just wanna hear the motor rotate faster. Than I recomend buying an electric series motor, put no load on it or overloads/cutouts, and power it up. It will just spin faster and faster and faster untill it explodes (destroy's itself). Its pretty wicked. jk of course lol

 

well i've been reving my engine to 7k for about two years now. Haven't had any problems whatsoever. But of course i do have a built head.

 

Well, revving higher can have alot of benefits besides sounding "cool" or w/e was said. For one, shifting out of a higher rpm allows you to stayer higher up in your power band resulting in more power delivered into your next gear