Opinions on Rev limit Built B18C

[ijwhiteman]

Right i'm only after opinions to give a different swing on it. (Opinion)

I won't tell you what i've been advised as that will bias your choice, just give me your logic.

Toda Spec C cams in a high compression fully built motor.

What would be your choice of rev limit and why?

The 3 that i have got imo to play with

Play it safe 8600 for reliability = I feel won't get the best from the cams and shorter final drive.

Quite simply 9100 meets in the middle (kind of)

9500 balls out! Its a track car after all and will spend very little time on the road anyway. Get the best from the cams and shorter final drive IMO but at a sacrfice to reliability

 

[sammyb]

9100 to get the greatest potentiel from your cams otherwise they wil be pointless in a sense

 

[ek9cub]

Mines running 8400 as per Will with stock bottom end and skunk2 cams. So 9100+ would be handled easy on your setup.

 

[Vtec6000]

If your springs allow I normally set the limiter 300-400rpm past where power starts dropping off. 9100rpm should be enough tbh.

 

[Gav-EK9]

voted 9100 Ian as think anything higher is just asking for trouble depending on how hard it'll get driven and being for track can imagine it'll be driven quite hard
cant wait to see it finished man

 

[sammyb]

is that roughly the safe limit on a stock b18c??

 

[mld22]

i'd say 9100 as well. Although i wouldn't take it that high too often

 

[Gunter]

voted for 9500+ as it should make some decent power up to 10k with the right bits, guessing youve got an mfactory 4.9fd?

 

[689R]

I rev my B18C with ARP headbolts and uprated valvetrain but standard cams/pistons etc to 9000 everytime I drive it. Easy 9100 on your forged engine.

Stock Limit is 8600, so why not increase with a bump in compression?

 

[KieranEG6]

I would have thought the 9100 should be a breez with your setup. Id say power would maybe peak somewere around there so have it at 9500 just incase its needed (as long as your valvetrain is up to it). After all dont have to hit the limiter every gear. Above 9500 i would have thought a little risky, as even spoon say to rev to 10k or above you would need one of those block braces to reduce vibration in the bottom end.

 

[xristos]

You will see that in the dyno.It is not standard.
For example if yours engine max hp is on 8500 rpm, then 9000 rpm rev limit is ok.

Toda C's are aggressive cams and you have to rev your car high to take the maximum hp from them.
At least 9300 - 9400 rev limit.

 

[Rich777]

Can i have the spec's of the engine ? Its imposible to say without them.

 

[SPek9]

Just to add my experience, my old UK DC2 with completely standard internals had the rev limit lifted to 9k and it has been rev'd to that from when the 1st owner got it mapped until now with 130k on the clock

 

[ijwhiteman]

Thanks all for your input

voted for 9500+ as it should make some decent power up to 10k with the right bits, guessing youve got an mfactory 4.9fd?

4.785 fd

Can i have the spec's of the engine ? Its imposible to say without them.

Semi-Coated Slipper Style racing pistons WISECO (approx 13.2:1 overall)

IBspec RODS 1.8L

ARP2000 stretch-bolts

ALL OEM Honda Bearing set

Type-R Oil-pump, Honda OEM

Type-R B-series water-pump

TODA Spec C Cams

Viton stem seals for HIGH OUTPUT, high compression enignes

A1Tech headstuds (Superior to ARP). For high power applications

81.75NB - New OEM Factory HG

B-series timing belt

Bore then hone to spec and plateau cork hone finish

Full blueprint

Bosch Injector Dynamics 725cc ultimate injectors

Honda B series spring LMAs

HONDA B-series Cam Seals

Honda B-series seals , orings

Re-cut, polish and seat valve faces and sealing angles (3x angle valve)Serdi 4.0 + aluminium cleaning

Machine cylinder head flat on diamond bed Rhottler

Hondata S300 P28 OBD1

SUPERTECH B-Series competition valve-springs and retainers

Skunk2 gen2 Intake manifold port matched

BDL 72mm throttle body

AEM True time (gen 2) cam gears

 

[Rich777]

Sounds like a proper high comp setup to me ! I take it the blocks been bored on a Sunnen ? Is the rotating assemby been checked for how well its balenced ? You maybe fine but i'd definatly get it checked. How come your using supertech springs instead of Toda ? I'm not saying there's anything wrong in using them, just intrested. You may want to speak to your builder about running a aftermarket harmonic balancer to like ATI for extra reliablity. Is there any work been done to the oil pump ? or did your builder say it would be fine ?

If everythings working in harmony then let it rev to what ever it needs. Its a fully built motor at the end of the day.

p.s. What exhaust/header setup are you going to be running with those cams ?

 

[Topher-EK9]

9500+ FTW.

my B16A rev limit is 9300rpm.
all head work is Feels parts

i'd say it is better to have the rev limit high and know you can take it up there but simply rev it lower.
doens't work the other way round.

 

[ijwhiteman]

Sounds like a proper high comp setup to me ! I take it the blocks been bored on a Sunnen ? Is the rotating assemby been checked for how well its balenced ? You maybe fine but i'd definatly get it checked. How come your using supertech springs instead of Toda ? I'm not saying there's anything wrong in using them, just intrested. You may want to speak to your builder about running a aftermarket harmonic balancer to like ATI for extra reliablity. Is there any work been done to the oil pump ? or did your builder say it would be fine ?

If everythings working in harmony then let it rev to what ever it needs. Its a fully built motor at the end of the day.

p.s. What exhaust/header setup are you going to be running with those cams ?

Sunnen??? No idea mate lol

Its is being fully blue printed so i'd imagine so. The guy has a very good reputation i know he won't cut corners. Supertechs where chosen because they have a great reputation and have been used in most of his project including his own Turbo B16 for the past 35k miles. Also herd a couple of scary thing like Toda spring can't take the battering from there own cams.....

No work just brand new oil pump. Its also having an oil cooler fitted.

We (with the help of this thread have decided on 9000) As the head won't flow well enough above that without polish and porting and also the acceleration on ring wear is factor to consider.

Exhaust and header. Mugen 4-2-1 into baffled decat and spoon B pipe and N1 back box. My tuner mentioned that a full custom exhaust will release more power but funds do not permit at the moment.

 

[Rich777]

Sunnen??? No idea mate lol

Its is being fully blue printed so i'd imagine so. The guy has a very good reputation i know he won't cut corners. Supertechs where chosen because they have a great reputation and have been used in most of his project including his own Turbo B16 for the past 35k miles. Also herd a couple of scary thing like Toda spring can't take the battering from there own cams.....

No work just brand new oil pump. Its also having an oil cooler fitted.

We (with the help of this thread have decided on 9000) As the head won't flow well enough above that without polish and porting and also the acceleration on ring wear is factor to consider.

Exhaust and header. Mugen 4-2-1 into baffled decat and spoon B pipe and N1 back box. My tuner mentioned that a full custom exhaust will release more power but funds do not permit at the moment.

Sunnen make the best Honing/boring machines, i bet you any money it's been bored/honed with one .

Are you 100% sure these cams are for you if your only prepared to take the engine to 9000rpm ? I ask this because i had a simalar setup to this in the past with a set of JUN 3's and i had to take it upto 9500rpm. I know there not the same cam's but i have no doubt they'll be a top end cam like JUN 3. Remember bigger isn't alway's better when i comes to cam's, its finding the right set for you application/setup. If you do choose to use them then i'd make sure eveything else you have will work well with them first.

Your best bet is to ring Toda europe about them and see what they say. You won't get better advice anywhere else. The last thing you want is to hate the drive after you've spent all that money.

 

[ijwhiteman]

I've chucked them an email anyway. The real benefits i've seen with these cams is they massively beef up the midrange between 3-7k rpm which imo is where the Hondas need it. The primary lobes are 11mm!!! I've read as much as i can and most are saying B's and C's reach max power about 9k. We'll have to see what they tune like. They are a cam that i can grow into if i wanted to. But for me its the midrange they offer with these cams.

 

[Rich777]

Ok cool, i'v never come across anyone with them so i'll take your word for it on them been a midrange cam.

Make sure you mention your exhaust setup to them, if you know measurements of your header/exhaust then let them know what they are as these will be quite important.

Good luck with it by the way and i hope it works out well for you. Let us know how you get on.

Rich