I have a B18c5 block and ECU and I have a B16a off a 99 Si will the si head handle 9000 rpms if not what should I get to be safe?

 

Not for long...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec_racer_98GSR &raquo;</TD></TR><TR><TD CLASS="quote">I have a B18c5 block and ECU and I have a B16a off a 99 Si will the si head handle 9000 rpms if not what should I get to be safe? </TD></TR></TABLE>

it might but i would recommend new springs and retainers

 

thats it springs and retainers?
skunk2?

 

are you gonna be making power at 9k?

 

If you plan to rev up to 9000 all the time, I'd consider swapping out the LMAs for some Type R ones.... I've seen too many old B16 LMAs go out and collapse, sometimes causing the cams to break in half in the head.

 

lmas?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaeOne3345 &raquo;</TD></TR><TR><TD CLASS="quote">are you gonna be making power at 9k?</TD></TR></TABLE>
I dont think so but if I miss a gear I will be up there right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec_racer_98GSR &raquo;</TD></TR><TR><TD CLASS="quote">lmas?</TD></TR></TABLE>

TypeR "lost motion assemblies."

are you going to be upgrading your cams as well? If you're running stock cams, or TypeR cams, you'll stop making power well before 9k, so it's wasteful

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec_racer_98GSR &raquo;</TD></TR><TR><TD CLASS="quote">
I dont think so but if I miss a gear I will be up there right</TD></TR></TABLE>

I've hit a 10,500 rpm rev-limiter before, quite a few times when my damn clutch cable wasn't adjusted properly in my old LS/VTEC CRX.... 4 times in one night of racing (don't ask) but if your parts are in decent shape/condition, then hitting 9000 on occasion/accident won't kill anything... most of the time.

If you're really worried about over revving, spend money elsewhere to envoke a lower rev-limit, either by an ECU chip or with a VTEC/speed controller module.

 

I dont plan to rev that high Im planning to rev8000-8400max but the ECU go's to 9000 so if I miss a gear I'll be at 9000

 

MSD ignition box is always a good option too, if you need to set a revlimit.

 

so will a stock si head make power at 8300?or even 8400?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec_racer_98GSR &raquo;</TD></TR><TR><TD CLASS="quote">so will a stock si head make power at 8300?or even 8400?
</TD></TR></TABLE>

no

your car will be screaming, yet it will not be going anywhere

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by vtec_racer_98GSR &raquo;</TD></TR><TR><TD CLASS="quote">so will a stock si head make power at 8300?or even 8400?
</TD></TR></TABLE>

You're asking the question wrong. You should ask if the stock Si head will handle power at 8300+ with the proper setup, and yes it can, and that is mostly determined by the type of camshafts that you are using in the head. If you leave the stock B16 cams in the head, then most likely no, you will not have any power up that high, but only strapping your car onto the dyno and seeing what your peak HP is will only tell you where your car is topping out at (and that should be your shift point as there's no point to go any higher).

 

8500 no more

 

Mine starts losing breath at 8500 with CTR cams.

 

so I should set the redline to stock si 8000?

 

For now, yes.

 

I taped a valve at 9600 RPM on a 96 B16a3 with 63k miles on it. Only mods were Skunk2 ECU, AEM Intake, VAFC, DC 4-1 Header, FPR, and fuel rail. I would only take it to 8,500-9000 if I were you. But DONT DO IT ALL THE TIME!!! That was my problem

 

No limiter is gonna save you when you miss a gear shifting at 8500 RPM. A limiter will only help you if you aren't watching your tach and attempt to accelerate past that specific point.

Once you miss a downshift at 8k, its all in the tranny's hands. Cutting off fuel won't stop the tranny from spinning the engine to its impending doom.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SpoonFedHatch &raquo;</TD></TR><TR><TD CLASS="quote">your car will be screaming, yet it will not be going anywhere</TD></TR></TABLE>

There are a lot of good reasons to have some over-rev head room and not all of them involve making power above the engine's peak. Once you cross the peak and continue to accelerate, the engine doesn't just fall flat and "...will not be going anywhere."

I've been in numerous instances in an autocross when I'm in first gear and it's better to leave it instead of upshifting knowing that I'll have to downshift again about 1 to 2 seconds later. Being able to safely over rev doesn't necessarily mean the goal is to make power.

Think about it! (&lt;- say that slow and drawn out :-)

 

I seriously doubt that a stock cammed B16A head will make any extra power past 8100rpm or so.

Hell my B18C5 started dropping off right at 8000rpm on the dyno.

 

just to say it makes power at that rpm costs more money where as it could be spent more wisely utilizing the lower end of the tq and hp band imo.

Just because you saw a b16b from spoon in an option video hit 10k rpm's doesnt mean thats practical for street races or help you beat a gsr with 10 more whp and tq than you.

 

get a complete valvetrain (valves, springs, retainers) from spoon or toda or even jun. and cams would help you make power all the way to 9000.