B20Vt Skunk2 Pro 1's or ITR cams

[KieranEG6]

Right guys i dont really ask much on here but do now and again. I have read tones about cams and there gains. And been weighing up Pro/Cons on B20 and K20 for a while now. NOT intrested in boost before anyone sugests it!!

This question is mainly to those who have run skunk2 Pro cams or others (if they have found ones that are more suited??).

I have at pressent a B18CR. My goal is to build a b20Vt around 220-230hp with a flat torque curve. None of this flat spot at 5k ish then come on Vtec and bang!! away you go. I like a usable power curve not just a 6k-9k one.

The reason i have posted is that the SK2 Pro series cams seem to get good gains throughout and rated to have a more progresive power delivery. BUT i keep hearing that there agressive fast ramp cam profile has a tendency to eat followers If used as a daily and with track use.

Also im not looing for mega power and still want a reasonable MPG so 2nd question would be how much advers effect if any do these types of mid range gainer cams have on the daily MPG.

The reason i have put ITR cams into the equation is that i already have a full ITR setup and will be using the top end. And wondered if anyone has had or seen examples of bein able to get a good progressive curve with a good tune on those cams. I have heard of and seen a few make 220 on ITR cams but supect that they were tuned for peak more so.

(P.S. I know i could just do a K20 swap but when it comes down to it full built B20 to spec is at most 5k for me but a decent K20 swap with the characteristics im after would be in the reagion of 8k-10k done properly, besides im a B series kinda guy)

 

[tama666]

You might be better off sticking with the ITR cams as they provide the smooth transition you are after with engaging VTEC.

A B20 VTEC built correctly with ITR cams will have plenty of usable power/torque.

 

[si8pny]

Have you spoke to Daz at DNR to see what he recommends? As some of his B20 builds are epic

 

[RobNL]

Hi m8

I have an B20vtec setup

B20b stock bottom
ITR Head
B16 intake (best intake till 7800 rpm)

The b20v pulls really good till about 6900 rpm.
I got vtec @ 4400 and she pulls like mad.
But i think for track u just want her to make a little more power till at least 7200 for the gearing.

Im hoping for a better result when using an 68mm tb on the b16a2 intake.


For cams i think you need something in the range of the ITR/ Skunk but with a longer duration to make full use of the stroke from the b20.

But im no mechanic, just an tuning fool

Let me know how your build is going to work out.
Setup etc

greetz

 

[KieranEG6]

Have you spoke to Daz at DNR to see what he recommends? As some of his B20 builds are epic

Is my next point of call to drop him an email.

Hi m8

I have an B20vtec setup

B20b stock bottom
ITR Head
B16 intake (best intake till 7800 rpm)

The b20v pulls really good till about 6900 rpm.
I got vtec @ 4400 and she pulls like mad.
But i think for track u just want her to make a little more power till at least 7200 for the gearing.

Im hoping for a better result when using an 68mm tb on the b16a2 intake.


For cams i think you need something in the range of the ITR/ Skunk but with a longer duration to make full use of the stroke from the b20.

But im no mechanic, just an tuning fool

Let me know how your build is going to work out.
Setup etc

greetz

Your right in a way. The b16a intake is the best performer for a street setup, mainly using up to 7500rpm. BUT it really struggles past 7500rpm where the Type R surpasses. I have tried both on my B18C and you can really feel the difference from 7k up. With the b16a intake it does pull harder and smoother low-mid but feels too strangled up top for me. Plus on track it will be up at 7-8400rpm most the time. I have considered playing around with each intake but to really see the difference i would have to spend tones of time mapping each one. So im just decided to stick with the ITR as i live in the isle of man so only plan on making the trip across for mapping once.

I will be running high comp at about 11-11.5:1 CR. Dont really see the need for more being a daily aswell. Going to be running my DC2 airbox or mugen, my toda 421 or sell that for a Tri-Y.

What is the transition like into Vtec with the ITR cams??

Im more worried about tha wear on the followers the sk2 pro cams may give.

 

[rvm]

CTR cams:

Hytech Header
Hondata S300
Mugen Intake
2.5" Exhaust

Skunk2 Pro 1
Supertech Valvetrain
Hytech Header
Hondata S300
Mugen Intake
2.5" Exhaust
Intake Cam: +2
Exhaust Cam: +1

I decided to go back to ctr cams, because I was not able to get a decent idle with 11.3 compression + Hondata and this car is a daily drive one.

You might see this numbers too low, but the dyno here is located 6000 feet above sea level, at sea level this can be around 10 to 15 whp more.

 

[RobNL]

Is my next point of call to drop him an email.



Your right in a way. The b16a intake is the best performer for a street setup, mainly using up to 7500rpm. BUT it really struggles past 7500rpm where the Type R surpasses. I have tried both on my B18C and you can really feel the difference from 7k up. With the b16a intake it does pull harder and smoother low-mid but feels too strangled up top for me. Plus on track it will be up at 7-8400rpm most the time. I have considered playing around with each intake but to really see the difference i would have to spend tones of time mapping each one. So im just decided to stick with the ITR as i live in the isle of man so only plan on making the trip across for mapping once.

I will be running high comp at about 11-11.5:1 CR. Dont really see the need for more being a daily aswell. Going to be running my DC2 airbox or mugen, my toda 421 or sell that for a Tri-Y.

What is the transition like into Vtec with the ITR cams??

Im more worried about tha wear on the followers the sk2 pro cams may give.

Hi m8

well the transition is smooth. Tried different settings.
5500, 5200 vtec came in with an brutal kick and because of the revlimit of 7500 it was to small of an powerband.

Then i tried 4800 was good but still hard.From that to 4200 but then the engine had trouble handling vtec...it felt slow.

With 4400 i hit the marker for my setup. U hear vtec really good but the transistion is really nice. Not necksnapping like 5500.

how much RPM r u planning on using?

 

[KieranEG6]

Will be running up to 8200-8400 limit.

 

[RobNL]

Will be running up to 8200-8400 limit.

And mostly circuit?Then i would indeed go for an type R manifold with 62 or 64.5mm tb. use cam gears for timing to get more top end power + type R waterpump to prevent cavetation from 7500 RPM due to OEM b20 waterpump.

 

[KieranEG6]

And mostly circuit?Then i would indeed go for an type R manifold with 62 or 64.5mm tb. use cam gears for timing to get more top end power + type R waterpump to prevent cavetation from 7500 RPM due to OEM b20 waterpump.

I dont mean to sound off here and thank you for your freindly help. But the thread was for the perpose of cam advice. I feel a bit insulted you assume i dont know what im doing and havent researched when it comes to building the rest of the B20.

 

[shaggy ek4]

ive just ordered some skunk 2 cams + Gears hopefully they should make it rather tasty

 

[RobNL]

My bad m8

It wasnt my intention to give u the feeling that you dont know what you are doing. It was just me with my enthousiasm wanting to give as much info as possible.

I dont mean to sound off here and thank you for your freindly help. But the thread was for the perpose of cam advice. I feel a bit insulted you assume i dont know what im doing and havent researched when it comes to building the rest of the B20.

 

[kellsled]

I dont mean to sound off here and thank you for your freindly help. But the thread was for the perpose of cam advice. I feel a bit insulted you assume i dont know what im doing and havent researched when it comes to building the rest of the B20.

he just trying to help dude lol if your looking reliability stick to itr cams

 

[hpmx18]

i think all pro series cams need compression to do wat they are designed to do other wise stick with the ITR'S as i seen they tend to make great power sometimes more then aftermarket but then again that my 0.2c

 

[Al-himself]

i had a stock b20bottom end running CTR cams reving to 8500rpm

made 197.2bhp on a dynodynamics
149.7ftlbs

it made pretty usable power down low but was a flyer up high.

still had the usual B-series crossover though.

im currenly building another b20 using 84mm itr pistons and stage2 skunk 2 head.

ill let you know how i get on

 

[KieranEG6]

Cheers mate let us know.

So far people seem to say skunk2 pro series are not suited to the b20. Maybe something to do with the amount of lift they have.

I have been advised to go with some buddyclub spec 3plus as they have a bit more lift than the ITR cams but allot more duration and bigger pre-vtec lobes. I researche a few graphs and they seem to be what im looking for. Good gains mid, smooth cross over and bit more up top over the Type R's. And on the plus side they are stated able to be used with std type R valvetrain. So there's even less money needed.

 

[tama666]

Cheers mate let us know.

So far people seem to say skunk2 pro series are not suited to the b20. Maybe something to do with the amount of lift they have.

I have been advised to go with some buddyclub spec 3plus as they have a bit more lift than the ITR cams but allot more duration and bigger pre-vtec lobes. I researche a few graphs and they seem to be what im looking for. Good gains mid, smooth cross over and bit more up top over the Type R's. And on the plus side they are stated able to be used with std type R valvetrain. So there's even less money needed.

Or stick with your ITR cams, lol. Looks like you have two great choices, please lets us know of your results; good or bad. ciao~

 

[KieranEG6]

Or stick with your ITR cams, lol. Looks like you have two great choices, please lets us know of your results; good or bad. ciao~

I was initialy going to stick with my ITR cams as im only looking for around 220hp goal. With a mild higher comp build thats about right. But from what i have seen of other peoples results the type R cams still give that flat spot before vtec then hike in torque once into vtec. Were as the BC spec 3+ seem to give a generaly smoother delievery from go right up through. But i dont think they give much more peak than the ITR's im only expecting around 225hp but i would be plenty happy with that as long as the torque curve is flat.

 

[tama666]

I was initialy going to stick with my ITR cams as im only looking for around 220hp goal. With a mild higher comp build thats about right. But from what i have seen of other peoples results the type R cams still give that flat spot before vtec then hike in torque once into vtec. Were as the BC spec 3+ seem to give a generaly smoother delievery from go right up through. But i dont think they give much more peak than the ITR's im only expecting around 225hp but i would be plenty happy with that as long as the torque curve is flat.

Good options still, OEM cams would be the low cost route to take of course...seeing that no upgrade to your valve springs/retainers are needed to use the BC cams, makes it easier on the pocket and mind for a staged upgrade.

...you are inspiring KieranEG6, I just may build myself a B20 frankenstein here soon after my B18c-r is buttoned-up.

 

[shaggy ek4]

well ive backed out my Skunk 2 ones as i needed new pistons for them to work properly so ive sourced some EK9 cams im hoping for around 200Bhp pretty basic build B20b Freshly built block, new piston rings,acl race bearings etc b16 head 4-2-1 mani, G/E Vtec kit chipped p28 ecu will let you know what it makes although it wont be done for a couple of months yet