i am currently on the GP for a tr224, but i have been reading a lot lately about how great the new xe-r cams are or should be. would there be a big difference between the two cams on a stock motor like mines (see mods in sig)? if i were to get a xe-r it would be the 224/224 .581/.581 112lsa

<small>[ April 03, 2002, 01:48 PM: Message edited by: geniusjester ]</small>

 

Well, first of all not really. There would be small gains to be had with the higher lift and faster ramp rate of the Comp lobes; however, this is also why you might not want it.

To really safely use the XE-R lobes people are sugesting double coil valve springs which are about $300 plus machine work to the heads. If you don't go this route the extremely high lift combined with those ramp rates will kill the 918 springs if you actually get the motor into it's 6800+ upper power range. I'm personally going with the TR224 cam as it seems to be a more practical route for a cam only swap.

- Matt

<small>[ April 03, 2002, 02:54 PM: Message edited by: Magnus357 ]</small>

 

Agreed. Its not worth it for the extra money and hassle. Even if I went with a 226, im not sure it'd be woth the extra money.

 

Jason from Thunder sent me some info on the TR224 vs. the XE-R 224, and the ramp rates are virtually identical. Their opening and closing points BTDC and ABDC were VERY close to each other, so close that you wouldn't be able to tell the difference between the two. The only difference between the two cams is the fact that the XE-R has the added lift. I wanted the added lift, so I went with the 918's. I know of a few running the 918's with this cam, along with other high-lift cams, and so far so good (fingers crossed). I'm installing 918's w/ my 224 XE-R as well.

 

thanx for the replys fellas...looks like im going to stick with the tr224. i figured the extra lift wouldnt be that noticeable but had to ask <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />

<small>[ April 03, 2002, 11:38 PM: Message edited by: geniusjester ]</small>

 

I had been planning on the TR 224 cam, but I've seen the xe-r 224/228 .563 cam on speed inc. Would it be worth it to get this xe-r over the TR cam, being that it's cheaper? I figure the extra exhaust would help out the nitrous, along with the new heads and stuff going on with the cam.

 

There is a difference between the XE and XE-R lobes.
Also there have been gains of around 1mph from the 224/224 .56x lift cams to the 224/224 .581 lift cam.
Cheers,
Chris

 

The pros and cons of aggressive lobes are they help power when cam duration is near too big for compresssion ratio of motor, they utilize cylinder pressure better, the badside is that action causes valvetrain vibrations and increased friction, this can lose power at higher rpm than similar size, less aggressive cam.High rpm wants smooth silky action from valvetrain and lower end also benefits from less vibrations. <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />