Off the shelf cam options for marine engines
02-21-2016, 08:57 PM
#581
Registered
Here's another tidbit - even though an extreme psi + rpm difference, but a lot shorter time period, Warren Johnson had mentioned his valvesprings where proven to hit 700*F by the end of a 1/4 run. Yeh, that's a wholly crap !
Everyone looked at MT's link earlier where it had graph's showing psi lost vs heat increase right ?
02-21-2016, 09:21 PM
#582
Registered
Good info.Thanks.
Here's another tidbit - even though an extreme psi + rpm difference, but a lot shorter time period, Warren Johnson had mentioned his valvesprings where proven to hit 700*F by the end of a 1/4 run. Yeh, that's a wholly crap !
Everyone looked at MT's link earlier where it had graph's showing psi lost vs heat increase right ?
Here's another tidbit - even though an extreme psi + rpm difference, but a lot shorter time period, Warren Johnson had mentioned his valvesprings where proven to hit 700*F by the end of a 1/4 run. Yeh, that's a wholly crap !
Everyone looked at MT's link earlier where it had graph's showing psi lost vs heat increase right ?
02-21-2016, 09:58 PM
#583
Registered
I think I've heard of those lifters. Doh !
02-24-2016, 12:08 PM
#585
Geronimo36
Gold Member
I had a solid lifter go bad on an engine two years ago on my 138631 cam. I caught everything before there was a catastrophic failure but still had to replace the cam and lifters. They lasted about 200hrs but the Comp lifters that were in the other engine were fine. I would normally go 250 hrs with Morel/Comp/Crane lifters before changing them. They were less expensive than the competitors lifters at the time I purchased them but the heat treat process they were using is I chose to try them back then. When all said and done, I wound up replacing the lifters on both engines with Isky Red Zone's.
02-24-2016, 12:09 PM
#586
Registered
I hope their lifter quality has improved. I can't unequivocally say they were bad but, they didn't perform like I was hoping. Maybe I got a bad set.
I had a solid lifter go bad on an engine two years ago on my 138631 cam. I caught everything before there was a catastrophic failure but still had to replace the cam and lifters. They lasted about 200hrs but the Comp lifters that were in the other engine were fine. I would normally go 250 hrs with Morel/Comp/Crane lifters before changing them. They were less expensive than the competitors lifters at the time I purchased them but the heat treat process they were using is I chose to try them back then. When all said and done, I wound up replacing the lifters on both engines with Isky Red Zone's.
I had a solid lifter go bad on an engine two years ago on my 138631 cam. I caught everything before there was a catastrophic failure but still had to replace the cam and lifters. They lasted about 200hrs but the Comp lifters that were in the other engine were fine. I would normally go 250 hrs with Morel/Comp/Crane lifters before changing them. They were less expensive than the competitors lifters at the time I purchased them but the heat treat process they were using is I chose to try them back then. When all said and done, I wound up replacing the lifters on both engines with Isky Red Zone's.
http://www.competitionproducts.com/m.../#.Vs3yKHTnZnE
02-24-2016, 12:10 PM
#587
Registered
After some back and fourth I ended up buying a cam from Jones. Only company that had a reasonable turn around time. It's difficult to get 55mm cores with small lobes.
02-24-2016, 12:11 PM
#588
Geronimo36
Gold Member
That's what they told me when I bought them but still had the failure. One lifter hammered the bearings out of it and 3-4 other were on their way out. I ran the same setup since 2007 without other issues.
02-24-2016, 12:13 PM
#589
Registered
02-24-2016, 12:17 PM
#590
Registered
I dont know what they were using 10 years ago. Im talking about today.
