I did consider RM24s for my build TBH, I would still like to dyno them back to back with the Buddy Clubs. If you have an set to send me I'll gladly set up a Dyno day.

I'd like to see the Buddy Club spec 5s on some of these big 2 liters too. I think it was 98Vtec that tried them and said they bled off too much compression, he made more power on the 4s. I've never seen a good dyno of the 5s.

 

Negative.

 

Sorry it was 92TypeR

https://honda-tech.com/forums/all-motor-naturally-aspirated-44/2-0l-itr-dyno-cams-bc5s-vs-itr-1523438/

 

No one's doubting how long you've been around as I've been around when those guys were contributing as well.

The Pro2 cams have worked well with most/all the 81.5-82mm bore setups I've built. Its the combo of parts that'll determine whether the cams will work or not. The 82mm in my sig is nowhere near 11.5:1 compression and yet works awesome with Pro2s.

Thats why if the OP thinks through his parts wisely, Pro2s are won't be too big and out of the question.

 

I have no doubt they'll make power, but he will have a MUCH nicer powerband with properly sized cams.

Tuner3s will make power too, I wouldn't recommend them.

 

I suppose everyone's definition of a nice powerband is different so I should've been clearer when I said that Pro2s could work for him, as in having a higher average powerband than other cams. Not just higher "peak" numbers.

 

Usually a sign of being 'overcammed' is a large dip at crossover, or the need to raise VTEC up over 6k.

I feel like a 11.5:1 compression 82x87mm build with "mild port work" would exhibit those characteristics on the Pro 2s, but maybe not.

I'll see if I can find some Pro2 dynos on similar builds.

 

slowsleeper's 240whp 1.8 only has 11.5CR

 

Tou, please do not consider my reply a "insult" upon you, i was just mearly stating some opinions / facts I've had the ablitity to see and experince.

 

No insult taken Derek. There are slight variances from one cam to another because of tolerances etc, so I am not one to go and accuse someone else (not knowing their background) that their facts are wrong. I am sure u have good reasoning into profiling your cams the way u do and that's great. I am sure u've known me long enough to know that I don't blow smoke or hype anything with solid data to back up whatever I am posting.

 

Get him. LoL

 

Advertised duration and lift are only part of the equation. Overlap is another factor as well as ramp angles. The bigger picture really is how and when valve events are occurring. Two intake cames with identical advertised duration and lift can have vast differinces in valve events.
Two cams can have the same duration and lift, but what about where atdc peak lift occurs? Another example is 2 cams both have the same peak lift/duration, but completely different lift figures meadured at various btdc and atdc events.

 

Thanks for all the help and insight guys. Im still up in the air on the cam decision. I know alot of you disagree with the manifold choice but I had good luck with it on another NA build where people said it was a bad choice yet were suprised by the results. Plus I already had it.
Budget also plays a factor in cam selection unfortunately.

 

My offer still stands to you if you are looking to keep the budget down. I have a set of M22x's I want to sell to go "bigger". I'll make a good deal on them, especially if you are local . They will be roughly half as expensive as anything you are looking at...and they are proven performers in healthy 1.8's. Tou can attest

 

with the possible exception of the bc3+. from what i see they often have a crossover within a few hundred rpm of 6000 and i wouldnt consider them overcamming on many motors including what the op has....

 

over-cammed means that when switching to smaller cams (less duration) the car runs better

how else would you know it's over-cammed

 

Eh, I've seen exactly the opposite.

Here's what it looks like.

Another



I'm not saying that the Pro 2s wouldn't make power in this motor... but I think it would have a smoother powerband and a nicer crossover with slightly smaller cams.

 

what are the sizes of these engines and what IM and what are the port sizes

 

Those are both 1.8 liters with either stock heads or mild portwork, I don't remember exact specs, I just google Pro 2 dynos and grabbed the first 2 overcammed dynos I saw.

 

That first graph is on a b20v iirc. looks like pro series primaries are doing work.

 

Head flow / displacement determines the cam way more than compression ratio.
Obviously, every cam, small or big will perform better with higher compression. But that's obvious.

 

very strange tq curve on the first graph

 

There's a resonance of some sort happening. Probably a hindering in the exhaust system if I had to guess, look at how RPM eventually overcomes it.

 

ehh why dont i get offers like this... LOL


Back on topic :
im curious how the a/f looks like on that strange torque curve ... odd "double humpy" LOL

 

LOL it's an open offer to anyone who needs some B-series cams
I'm going a different route