I know Ive seen it discussed before but its not coming up on any of my searches. What makes them different? Which has a faster rate? Are there any other major differences?

 

If you could tell me the advetised duration and the .050" duration, I could tell you. I'm sure they are very similar, but like every cam manufacturer, cam motion has more than one lobe. I know all about XE-R's, but I don't have many cam listings from cammotion.

 

I mean the ramp rates and such, not the different cams.

 

thats what he was refering to

 

Ohhh ok..i just reread his post..it makes sence now

Well basically this is why im wanting to know. The FMS 226 .575 114 is on cammotion lobes (or so ive heard) However TSP is runing a great deal on everything I need for the cam swap. So I was thinking about getting the cam on an X-ER lobe but im afraid that it wont work as well as the FMS cam. Mike H. (i can never spell his last name) dynoed 400hp in a cam only set up with a 4400 stall and 4.10's. Im looking for similar numbers.

 

i'd spring for a custom FMS cam if i were you. both cams are great and put out stout numbers. all the FMS dyno's i've seen have nice under the curve power where it counts.

do a search for cam motion lobes, there was a thread about them not to long ago.

 

Just ask FMS for the advertised duration of that cam you want. Take what they tell you, if they tell you, and subtract it from the .050" number (226). The lower the number, the harder the ramp rate. XE-R ramprates have a diffrence of 53 degrees between advetised and .050". Anything below 53 will be harder anything above will be softer. You can do this on any cam to get the ramp rate.

 

Cool thanks guys.

 

I have had 226 XE-R and I have had the FMS-4 (226/.575 lsa 114). Both cams displayed similar characteristics, but the FMS cam felt stronger and dyno'd a little higher. The problem is I dyno'd higher with a different set of heads. One persons stage II's and anothers stage I's, so that is not a good comparison. The Stage I head's with the FMS-4 dyno'd higher, but this was not a back to back comparison. They both idle smooth as hell. I use to have both cam cards, but I cant remember the difference besides FMS-4 numbers were different.

 

So with the Stage 1's the FMS dynoed higher. Sweet. What there much of a difference under the curve or was it all peak #'s?

 

It's hard to go by Stage numbers. Some peoples Stage 1 has more work than others 2's. Kin of a hard comparison. I wish he could find the cam motion cam card. Maybe someone else with a FMS cam can post there advertised and .050" durations.

 

Well the FMS cam did have better mid range, but like I said the comparison is still flawed. My old Stage II heads flowed well and at .600 lift they were right at 304cfm, while my Stage I's were at 290cfm at the same lift. However, my Stage I's low to mid lift flow #'s were a lot better than my Stage II heads. Also the compression was over a point higher than my Stage I's. Also, my Stage II heads had 2.08 x 1.60 valves and my Stage I's had stock valves. As you can see.. A very difficult comparison. Now I am biased to Futral Motorsports because Candy and Allan are awesome, but both cams felt the same during everyday driving.

 

My 224 XE-R is advertised at 273 but the .050 is of course 224. This would give a ramp rate of 49 not 53. I think the 53 might be for the XE cams. Or am I misunderstanding the way to calculate it?

Thanks

 

I'm sorry, you are correct. With all these numbers I loose track sometimes. 49 is for XE-R lobes and 53 is for the standard XE lobe.

 

Beast, that's an excellent tip for a quick ramp check/estimate, I'm sure it will be very handy. Thanks.

 

Yea, it comes in handy sometimes. Sometimes it's just hard to get the advertised.