I have the N4s (mild cam). Nice little bump in power but dollar for dollar I think the Hammers may have been better. If you're 2 up you may want a cam with power that comes on earlier. The N4's move the power band to upper rpm range which is great for getting down the track fast but maybe not optimal for carting the Mrs's around.
However my Mrs's and I weight about 420 combined and my Sporty doesn't break a sweat. She's rarely on board though.
I agree with you. The n4 is the staple of the evo Xl cam.
the stock 1200 rubbernecked cams are pretty good for a stock cam. That’s where hammer prevailed with their knowledge, r&d ect. They designed a cam set that doesn’t drop lower mid power yet it climbs on top like a champ for a simple bolt in cam set. Hope that helps op
The 1st pic is Hammer's dyno tune from Madnss link above. Shows stock cam vs 570.
The 2nd is my dyno tune with N4s (N4 was in for both. Only change is going from FP3 to a Dyno Tune). We can put to bed the FP3 vs Dyno Tune question Look how much power the FP3 left on the table! But I digress....
You'll notice that the 570 is bringing on the power much sooner. See the power vs rpm on each. Once the N4 hits 3500 its a nice linear rip. I was still making power at 6500 but my Tuner didn't want to push the valve train too hard, whereas the 570 has maxed out at 6500. The 570 has me beat in all areas up to 6500. I'd have to get to 7k or more to match/beat but now we're not talking realistic daily riding conditions.
Hammer 570s. With the 56° of overlap exhaust plays a big role in where the power comes on the strongest. With my Khromewerks HP Plus slip ons I'm pushing 90ft.lbs. of torque before I hit 4500rpm. I'm all about the midrange. A good 2 in1 will do better up top, not quite as well in the middle.
While I level off HP wise around 5500rpm, I'm still in the mid 80s at 6500rpm. Far cry better than the stock Ws.
77 ft.lbs of torque at 2300 rpm. You give up nothing down low to the stock Ws.
You won't find another set of cams where there isnt a trade off.
The 560s, also 56° overlap and identical intake open but later intake close are a good top end cam. Also bolt in. You'll lose a little low end but have have the extra punch up top where the 570s level off. They'll do good at 10:1 but better at 10.5:1. The 570s were made for a stock 04+ 1200.
Hammer 570s. With the 56° of overlap exhaust plays a big role in where the power comes on the strongest. With my Khromewerks HP Plus slip ons I'm pushing 90ft.lbs. of torque before I hit 4500rpm. I'm all about the midrange. A good 2 in1 will do better up top, not quite as well in the middle.
While I level off HP wise around 5500rpm, I'm still in the mid 80s at 6500rpm. Far cry better than the stock Ws.
77 ft.lbs of torque at 2300 rpm. You give up nothing down low to the stock Ws.
You won't find another set of cams where there isnt a trade off.
The 560s, also 56° overlap and identical intake open but later intake close are a good top end cam. Also bolt in. You'll lose a little low end but have have the extra punch up top where the 570s level off. They'll do good at 10:1 but better at 10.5:1. The 570s were made for a stock 04+ 1200.
Yeah I love my 560s. I don't feel I loose that much on the bottom but it screams on the top end.
They both have their place and I know another guy at over at the XL forums feels the same way. Madness knows who I'm talking about.
I feel the same about the 570s tho. Below 5500 rpm we're talking a good 10ft.lbs of torque. Especially in the middle. Enough for a seat of the pants difference.
I couldn't give up 90ft.lbs torque at 4500rpm. But that extra punch up top has to be nice too.
He's also flat top 10:1 tho. Not sure what 10.5:1 would do for them.
What are you running them at apache?
Keep in mind on a stock 1200 the numbers may be slightly lower but probably not enough to notice. I'm a 1250 flat top @ 10:1 because of the .030 squish. Stock 1200 is 9.7:1 but the 570s were designed for that. Even at 10:1 you need be sure you have a good tune. Any higher compression ratio than 10:1 isn't recommended for the 570s.
I doubt you would be disappointed. Easy on the valve train too.
would they help Torque and or Horse Power?? .. Approx #s of gain ??
HP = Torque X RPM ÷ 5252.
HP and torque are always the same at 5252rpm.
In my case my torque is starting to drop by then but still high enough for my HP to be in the mid 80s and climb a little higher before the torque drops enough for the HP to level off. With the 570s the torque will peak around 4500 - 5000rpm depending on exhaust.
The longer the torque stays up the higher the peak HP numbers. The 570s aren't a big peak HP numbers cam. The 560s will do a little better peak HP wise.
My dyno ended up being something like 88ft.lbs./87hp but I wasn't dyno tuned either. Just tuned by ear and ran it on the dyno. I could probably squeak out 90hp playing with the timing a little more. More of a result of my exhaust torque curve tho.
meh, old tech, n2,4,6 and 8 are all cams developed for 91-03 technology. The hammer 570s are designed for 1200 stock internal rubbermounts. You won’t Lose any low end power and you’ll gain in the upper rpms. For some reason I can’t copy and paste Hammers 570 cams description.
Not to high jack the OP post but how complicated is swapping out the cams as I’ve seen the 570’s mentioned quite a bit.
10-29-2019, 01:41 PM
Look how much power the FP3 left on the table! But I digress....
