Cam and valvetrain longevity....??? low duration high lift...
09-30-2016, 11:45 PM
#823
Gold Member
Gold MemberThread Starter
Join Date: Oct 2005
Location: Olmsted Falls,Ohio Marblehead,Oh
Posts: 11,636
Likes: 0
Received 209 Likes
on
133 Posts
Don't forget Orlandi issues... Funny lots of things were kept hush until Tim spoke....
Looks like the lobes have some tracking issues on the opening side. I think that would mean, either the lifter acceleration rate if too steep , too much spring pressure, or simply, the heat treating of the lobe is no good. Even with solid roller spring specs, to do that to a billet cam, whether 8620, 8660, etc , shouldnt be happening. We arent talking 1000 lbs of open pressures like some engines run.
Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.
But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.
Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.
But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.
10-01-2016, 05:32 AM
#824
Registered
Looks like the lobes have some tracking issues on the opening side. I think that would mean, either the lifter acceleration rate if too steep , too much spring pressure, or simply, the heat treating of the lobe is no good. Even with solid roller spring specs, to do that to a billet cam, whether 8620, 8660, etc , shouldnt be happening. We arent talking 1000 lbs of open pressures like some engines run.
Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.
But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.
Im sure theres a reason companies like comp, crane, lunati, howards, arent doing .400 lobe on a 241 degree cam. But from the other cams ive seen come from haxby, mer, another diy guy, and now tims, it looks to me, like theres a serious heat treating process on these custom ground lobes.
But im no cam grinder. It be interesting to send the cam out and checked for hardness. Im gonna forward these photos to Mike Jones, and see what his take is on them. He actually grinds cams, heat treats them, etc in house.
10-01-2016, 07:18 AM
#827
Registered
Tim I just searched back for my invoice when I bought my cams, it had the same description as yours and part number, I paid $435 a cam, and they were the 8620 core. I remember that specifically. I bought mine back in 2013.
10-01-2016, 07:51 AM
#830
Registered
Tim, I have a King hardness tester here, I can bring it over of you want to check them. I also have a Equi-tip tester that more used friendly, let me know. I will travel, will work for beers.
Also, this guy interrupted our dinner last night, how rude. (I was at the bar instead of helping Tim)
[ATTACH=CONFIG]559924[/ATTACH]
Also, this guy interrupted our dinner last night, how rude. (I was at the bar instead of helping Tim)
[ATTACH=CONFIG]559924[/ATTACH]
