Will the 3100 series lobes, vs 3300, cause the engine to make peak power lower and therefore not having to rev the engine to 6500?

Thanks,
Jeremy

 

Don't know about the lobes you mentioned but using a cam with a tighter LSA will keep the rpm in the lower range. Of course, that's not emmisions friendly but what exactly is the application here??

-Mindgame

 

Well the xe 230/236 with 3300 series lobes will have .510/.520 lift whereas the 3100 series lobes will have .585 on both i/e.

 

If you mean Comp Xtreme Energy hyd. rollers, the 3100's are more aggressive (more lift for the same duration) than the 3300's, so most likely you can get power at lower rpm. I've seen it done.

Of course, the 3190 series lobes are VERY aggressive, and 6500 is probably about as high as you should run them, unless you get into very high load (and high cost) springs. They are very effective lobes when used at reasonable speeds, with good flowing heads.

 

I dont know the answer for sure, but i would maybe shoot a PM or email to Rich as he runs one and knows quite a bit about them.

 

Who's Rich?

 

rkrause-username

A very knowledgeable cam dude.

 

I can't find that member name. It say that it doesnt exsit.

 

Try this for rskrause

http://web.camaross.com/forums/membe...fo&userid=2101

 

hehe sorry i get too comfortable refering to people by first name on here

 

I am also thinking about using the 224/236 3100 Xtreme lobes and Im wondering what to do about the lifter end. You cant get the Comp R's anymore and I cant get a definite answer if the 850-16 Comps will hold 6200 to 6300 on these lobes. I called Comp about getting some earlier linkbar type R's and mill my lifter bores down to use these, oh gawd guess what they are out of them also. So what is everyone else using? The springs I already have in order for the lobes, Thanks for anybodys input

p.s. Thanks to Bret Bauer for helping me so far in this, thanks again

 

I think that it's the usual "it depends" answer. In general, a higher lift cam with the same duration will have more hp everywhere (low, middle, or high). However, that's partly dependent on heads and the actual amount of lift. But no matter what, the peak revs without valve float will be lower with the higher lift cam. So you could get into a situation where you have to stop revving the higher lift cam (or experience valve float), and the lower lift cam will keep making power to higher revs. But up to that point, the higher lift can only help.

That's why the XE lobes make such great street lobes, who want's to rev the snot out of a motor on the street to make hp?

Hope this helps.

Rich Krause

 

What is the main difference between the 3300 series and the 3100 series?

Is the 3300 series better than a CC 305- or cc 306 cam up to 6krpm?

 

Now you are on track! The XE lobes are indeed a better choice for a lower revving setup, though the lobes on the 306 are also pretty steep. The XE lobes are (in)famous for being very "steep", IOW they have high lift/degree of duration. You can get a feel for how steep a lob is by looking at 0.050" duration and comparing lifts at 0.200" and total lift.

For example, compare the 306 intake lobe #3112 with XE lobes 3315 and 3194.

3312
230 @ 0.050"
143 @ 0.200"
.3400" lobe lift

3315
230 @ 0.050"
151 @ 0.200"
.3400"

3194
230 @ 0.050"
157 @ 0.200"
.3890"
So as you go down the list, the lobes get steeper (reach 0.200" lift sooner). In fact 3312 and 3315 have the same lift, but 3315 is "steeper", ie reaches that peak lift sooner.

More lift (sooner) is better, to a point

Rich Krause

 

I guess the point would be spring life...
Too much lift soon will decrease significantly spring life and can cause valvetrain failure...