Your donations help keep this valuable resource free and growing. Thank you.
|
Comp Roller Lifters Problem |
Post Reply | Page <1 56789> |
Author | |
73XBGT
AMC Apprentice Joined: Jan/28/2010 Location: Huntsville, AL Status: Offline Points: 123 |
Post Options
Thanks(0)
|
SKeown, I talked briefly with Mike Jones (CamKing) today. He says I should still be ok with the shell hardness. Still, after re-reading his quote above, I realize there are no guarantees.
|
|
SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
Post Options
Thanks(0)
|
73XBGT, I never harp on anything that I haven't had personal experience with. I feel that's what the forums are about. Naturally I do post questions and appreciate responses from those that have real life experience on the topic. I've not experienced issues with reground cams, but understand you've already had the base circle reduced by what appears to be .010 and now considering an additional .060". Hopefully it will be fine, but I don't feel it's necessary. That's all.
SKeown
|
|
4015spdJavAMX
Supporter of TheAMCForum Joined: Nov/18/2008 Location: Northern CA Status: Offline Points: 250 |
Post Options
Thanks(0)
|
For what it is worth, here is a picture of my cam mentioned earlier in the thread (0.688/0.711 lift with 1.6 rocker arm ratio, ground by Comp cams): Note that the heel of the lobe is very close to the base circle diameter.
Edited by 4015spdJavAMX - Jun/25/2010 at 5:31pm |
|
1972 Jav-AMX 401 4-speed....T56 next?
1970 AMX 390 auto, now 5-speed 1970 AMX 390 4-speed, stock |
|
forest
AMC Addicted Joined: Nov/14/2008 Status: Offline Points: 2114 |
Post Options
Thanks(0)
|
well guys, got a lifter in my hands that will go .398 on lobe lift before it starts to expose the roller wheel. I will be in contact with Crower tomorrow and will talk about getting one that will go to .420 lobe lift or higher?? What do you guys need? Please post up what kind of lift you are looking to run at the lobe and Ill get it done. The lifters I have here are ready for production if anyone wants a set, if not, I will get a set made that will go higher. With a .398 lift and 1.7:1 Crower rocker you will get .675 lift - the lash of the solid roller setup....
|
|
setting guys out by car lengths....
|
|
SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
Post Options
Thanks(0)
|
What you have discribed (.398) is likely a Mopar lifter that they already had. That doesen't equal what Crane or probably the current Comp lifter's range. If you can persuade them to make the needed alterations to allow at least .750 valve lift using 1.6 rockers, or .470 lobe lift running a std base circle cam. Then they would likely corner the AMC roller lifter market.
SKeown
|
|
forest
AMC Addicted Joined: Nov/14/2008 Status: Offline Points: 2114 |
Post Options
Thanks(0)
|
I think a nice even .500 lobe lift is what Ill ask for.. this is simply a lifter that can be easily modified before it is put into production likeit sits now.. They make their own lifter bodies in hous and can cut them however is needed.. will post more after Im done with them on the phone tomorrow.
|
|
setting guys out by car lengths....
|
|
Hornet_X
AMC Nut Joined: Jul/30/2007 Location: none ya Status: Offline Points: 306 |
Post Options
Thanks(0)
|
Yes Forest, the more the better, I have sleeved bores but run .750 lift in my iron block. and imo the bigger the wheel the better as well.
hey if you don't ask??
Thanks
Mike
|
|
SKeown
AMC Addicted Joined: Jul/30/2009 Location: Texas Status: Offline Points: 3085 |
Post Options
Thanks(0)
|
Mike, I'm affraid going to a larger diameter wheel than .750" would be counter productive in terms of what the AMC community is trying to achieve.
SKeown
|
|
forest
AMC Addicted Joined: Nov/14/2008 Status: Offline Points: 2114 |
Post Options
Thanks(0)
|
Ill probably stick with the wheel they have to make things simple, but I will have this shroud brought down another .100.. Ill be talking to them today about it and letting them know what is needed.
|
|
setting guys out by car lengths....
|
|
Red Devil
AMC Addicted Joined: Jul/10/2007 Location: Canada Status: Offline Points: 1743 |
Post Options
Thanks(0)
|
Here's a small roller (0.390" lobe) next to a stock cam. Notice the base circle and nose? So, does the base circle just get smaller with more lobe lift? If you have sufficient shrouding for max lift, or the "nose" of the lobe, do you need more shrouding to get more lift, or does it depend on the grind, i.e. do they grind some off the nose for lower lifts?
If you could use a bigger roller wheel, and have the same or more shrouding as a smaller wheel, seems like it would be the best option. Comp typically has less shrouding than Crane because of the larger wheel, so with clearance for the wheel it cuts more into the shroud area. Need to have either a small wheel or a close clearance cut for the wheel to get more shrouding. Edited by Red Devil - Jun/30/2010 at 12:12pm |
|
Post Reply | Page <1 56789> |
Tweet
|
Forum Jump | Forum Permissions You cannot post new topics in this forum You cannot reply to topics in this forum You cannot delete your posts in this forum You cannot edit your posts in this forum You cannot create polls in this forum You cannot vote in polls in this forum |