H/C car: 5.3 Heads milled .005 for clean up, with TR 224/.561/ 112 cam. I can get Crane 1.8 rr for free from a friend. Will they work with this combo? Thanks for the help.

 

Sorry, its no way. Ramp rates are way too fast, your valve train will basicly destroy itself. The TR224 uses the XE-R lobes, and it just wouldnt work, sorry <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

 

From Thunder:
"Due to the fast ramp rate of this camshaft, the use of 1.8 rockers is not recommended"

 

If you do decide to do this, video tape it so I can see what happens. <img border="0" title="" alt="[Cool]" src="gr_images/icons/cool.gif" /> just joking of course.

 

<img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" /> Here's a hypothetical question. What if I had 1.75s from Jessel?

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by stang killer:
<strong>The TR224 uses the XE-R lobes, and it just wouldnt work, sorry <img border="0" title="" alt="[Sad]" src="gr_sad.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">TR does not use the XE-R lobes.

The problem with using the 1.8 rockers is finding a valvespring that will be able to control the valve. Upping the rocker arm ratio will make the cam act so much more agressive at the valve. You will get into the problem of needing alot of spring pressure to take advantage of the increase in rocker ratio. Once you do find a spring that will work, you will more than likely collapse the hydraulic lifter in the process due to the amount of open pressure needed.

Jason

 

Jason,

The TR224 and XE-R 224 lobe profiles virtually lay on top of each other with the expection of increased lift of the XE-R. The opening and closing rates are the same.

Tim

 

Not trying to sound like an expert, but TR told me that their 224 cam has faster ramp rates than the XE-R grinds so I would have to assume the lobes are different, no?

Dan

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by TimZ28:
<strong>Jason,

The TR224 and XE-R 224 lobe profiles virtually lay on top of each other with the expection of increased lift of the XE-R. The opening and closing rates are the same.

Tim</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Tim, you are exactly right. stang killer stated that the TR224 used the XE-R lobes, which isn't correct. The only major difference is the max lobe lift between the two lobes. The duration @ .050", .200", etc. are nearly identical.

<small>[ December 01, 2002, 10:53 PM: Message edited by: Jason99T/A ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by r8ls1:
<strong>What about the ramp rates of XE lobes , are they too fast for 1.8's also ?</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Yes they are.

Paul