I determine it a little differently than most folks, but bowtie got it pretty dam close. Most times stuff that looks aggressive, might not really be that at all.

The 305 should work great with the 1.7's

Bret

 

considering your location is camshaft heaven, I will take your word for it.

thanks for the info too about the ramp rates 97bowtie.

 

I dont see a problem with running the 503 with the 1.7r on that cam it should stay under control untill about 6400-6600 rpm's with your setup. Since your going to shift it early you wont have a problem as long as everything is set up right. Cause the Xer lobes for ls1 are just as aggressive and even with the lighter valve those guys are spinnig them to 6800 rpm's with out a problem, so with the lt1's heaver valve you should be able to go to 6200 without a problem. Run it and have a blast...

 

Shannons86,

Your missing the point that the LS1 has a 55mm cam journal, and the XE-R lobes are designed with that AND the lighter valves in mind.

Aggressive lobes on a 1.7:1 Rocker LT1 setup do not work well.... I don't care what the LS1's run, this is a different situation by a good amount.

Bret

 

That is true and a good point, but if you look at the lobes the ls1 is a little faster lobe major but the area under the curve the ls1 is still faster. So since the ls1 is a faster lobe and running the 1.7 rocker. Since the Xe is slower it should work fine since he is only wanting to run 6200 rpm, and using the ti retainers. I know of too many people running more aggressive profiles with the 918 spring and going the same or more rpm.

 

Shannon.... the point I was really trying to make is I've BTDT and I know what does and doesnt work.

Bret

 

ok ok. So the bottom line being that if you just want a cam and rockers and make ok power, go with what Bret is telling you. Like you said in the begining you wanted to make the most power, go with the XE lobe and run it. I know it will be stable to the rpm you are looking for. As far as the "BTDT" its time to go back to the testing phases. I honeslty think that with a steel retainer you could probably still be fine on running it. So let us know how it does if you go with the XE. You will be a lot happier. Good luck!!

 

What is with this big upswing in the 1.7rr follower population lately.


Go with 1.6 RR. End of story.

 

Benn tested time and time again... two cams of simaler profile one with 1.5's and one with 1.7's that comes out to the same lift. The cam with 1.7's will make more torque and power, be easier on the lifter and the cam, so the aggressiveness comes from the rocker and not out of the cam.

 

I am not understanding how that is possible.

How do you get the same lift with 1.5's and 1.7's? Can you list an example of an LTX camshafts that you are comparing that fit this model with a dyno graph?

 

CamaroGuy22 I believe shannons86 is trying to say that you take 2 different cams with the same specs but one of the cams has a .575 lift with a 1.5 RR and the other cam has a .575 lift with a 1.7 RR. The cam using the 1.7RR will make more power.

If I am not mistaken certain Nascar classes or what not use high RR's some over 2.0

 

No.... I'm saying go with a lobe that will work with the 1.7's... when I say the 503 will not, I mean it.

Ok don't believe I've tried it whatever, your right you know wtf you are talking about. Whatever...... listen to who you think knows the most about this.

FWIW most times on these setups from the average guy, if you run less rocker with the same total lift you will do better. End of story.

Bret

 

Bret... I am sorry that I come in here ruling your comand post. I just wanted the guy to make good power not have a dyno queen motor. So go look at yourself in the mirror one more time make yourself feel better and believe that a rocker dosent matter power wise.

 

You just joined last month, you have 30 some posts under your belt. Bret designs camshafts and is very knowledgeable. I agree that 1.7 rockers with a XE 224/230 camshaft is a bad idea. You are not going to win this, instead this post will probably get locked and you will get a PM from a moderator, so just leave it at what is is.

 

Wow.... good job at looking like a moron buddy.

I'm glad you can explain your thoughts based on some experience or physics.... so how do you make good power and not be a dyno queen.... isin't that the same thing?

I think you are really, really missing the point here. The point is the valvetrain stability. If you don't have that your not going to make power at high RPM and the CAR WILL NOT BE FAST. What about NOT BEING FAST is associated with being a dyno queen?

If you wanna get in a arguement you picked the wrong guy. Go look at some of my posts, If I don't agree with you I'm going to tell you why, having a arguement with guys who just have some opinion on the matter is fine with me, your just going to lose.

Bret