Roller lifters input
05-11-2005, 01:50 PM
#132
Registered
Re: Roller lifters input
JDCB,
How many hrs did your buddy get and how nasty was the cam? From my experience with solid rollers the life expectancy is pretty good if the net lift is kept .700 or less and if the duration @ .200" is 200 degrees or less. Spring selection has to be an endurance type spring that will maintain adequate pressure as they cycle out. If the lobe design is too aggressive, i.e. a drag race cam, life will be pretty short in an endurance motor. I wouldn't recommend running a solid roller lifter more than about 100 hrs even with a mild lobe design. Just my .02! Let us know what you decide to go with!
Craig
How many hrs did your buddy get and how nasty was the cam? From my experience with solid rollers the life expectancy is pretty good if the net lift is kept .700 or less and if the duration @ .200" is 200 degrees or less. Spring selection has to be an endurance type spring that will maintain adequate pressure as they cycle out. If the lobe design is too aggressive, i.e. a drag race cam, life will be pretty short in an endurance motor. I wouldn't recommend running a solid roller lifter more than about 100 hrs even with a mild lobe design. Just my .02! Let us know what you decide to go with!
Craig
05-11-2005, 04:18 PM
#133
Charter Member #601
Charter Member
Re: Roller lifters input
GPM,
My cam specs are as follows. Intake, adverstised = 292*; at .050" =263*
Exhaust, advertised = 300*; at .050" = 268*. .686" valve lift on both I/E.
So what does this tell you? How agressive the ramps are? I lost one Isky lifter on this cam and had it reground, before Ultradyne sold out.
cstraub,
I take it you dont run Gapless rings? My buddy is looking to buy some rings for his motor and is wondering if it is worth the extra to use the gapless. He has run C&A's second ring gapless, and I am running Total Seal top gapless rings. Any pro's or cons for either or is simple better?
Next, where do I see a pic of the Brodix push rod liners? And where can I get them and does the hole have to be round or can it be oblonged? I have used bronze tubes in the past to seal up leaks in the intake ports from opening up the push rod tubes. Not the easiest thing to install..
Thanks
Dick
My cam specs are as follows. Intake, adverstised = 292*; at .050" =263*
Exhaust, advertised = 300*; at .050" = 268*. .686" valve lift on both I/E.
So what does this tell you? How agressive the ramps are? I lost one Isky lifter on this cam and had it reground, before Ultradyne sold out.
cstraub,
I take it you dont run Gapless rings? My buddy is looking to buy some rings for his motor and is wondering if it is worth the extra to use the gapless. He has run C&A's second ring gapless, and I am running Total Seal top gapless rings. Any pro's or cons for either or is simple better?
Next, where do I see a pic of the Brodix push rod liners? And where can I get them and does the hole have to be round or can it be oblonged? I have used bronze tubes in the past to seal up leaks in the intake ports from opening up the push rod tubes. Not the easiest thing to install..
Thanks
Dick
05-11-2005, 04:40 PM
#134
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Re: Roller lifters input
Originally Posted by Mr Gadgets
cstraub,
I take it you dont run Gapless rings? My buddy is looking to buy some rings for his motor and is wondering if it is worth the extra to use the gapless. He has run C&A's second ring gapless, and I am running Total Seal top gapless rings. Any pro's or cons for either or is simple better?
Next, where do I see a pic of the Brodix push rod liners? And where can I get them and does the hole have to be round or can it be oblonged? I have used bronze tubes in the past to seal up leaks in the intake ports from opening up the push rod tubes. Not the easiest thing to install..
Thanks
Dick
I take it you dont run Gapless rings? My buddy is looking to buy some rings for his motor and is wondering if it is worth the extra to use the gapless. He has run C&A's second ring gapless, and I am running Total Seal top gapless rings. Any pro's or cons for either or is simple better?
Next, where do I see a pic of the Brodix push rod liners? And where can I get them and does the hole have to be round or can it be oblonged? I have used bronze tubes in the past to seal up leaks in the intake ports from opening up the push rod tubes. Not the easiest thing to install..
Thanks
Dick
Nothing wrong with Trends pushrods either. Bob makes a nice part as does Terry at Manton and Dennis at Smith Bros.
Chris
05-11-2005, 07:42 PM
#135
Re: Roller lifters input
Mr.G, I used to be a firm believer in the Ultradyne cams also. Until I asked Harold to design a special cam for my boat. Best I can recall that was 6 years ago. I waited a full year for that cam and then gave up. I moved on to the Comp cams. I haven't broke a spring, a lifter or lost a lobe since. I run bigger cams with more lift and duration at way higher rpms with no problems. The ramps are just one step slower,they make great power, and I stay running. I have to wonder if your cam is part of your push rod problem.
Last edited by GPM; 05-14-2005 at 07:03 PM.
05-11-2005, 08:13 PM
#136
Registered
Re: Roller lifters input
Who would think that rolling a wheel up and down a hill could be so difficult. 
The root of the problem is the weight of the valvetrain, right? You have to have the nasty cam profiles to make the power, everything else is a tradeoff between strength and weight, and good parts aren't cheap.
So at what point is titanium going to make sense in a max effort marine engine?
The root of the problem is the weight of the valvetrain, right? You have to have the nasty cam profiles to make the power, everything else is a tradeoff between strength and weight, and good parts aren't cheap.
So at what point is titanium going to make sense in a max effort marine engine?
05-11-2005, 08:20 PM
#137
Charter Member #601
Charter Member
Re: Roller lifters input
Tomcat,
Have you price titanium motors.. lately?? Nothing I can afford.. well until I blow up everything else..!!
Have you price titanium motors.. lately?? Nothing I can afford.. well until I blow up everything else..!!
05-11-2005, 08:47 PM
#138
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Re: Roller lifters input
Originally Posted by tomcat
Who would think that rolling a wheel up and down a hill could be so difficult.
The root of the problem is the weight of the valvetrain, right? You have to have the nasty cam profiles to make the power, everything else is a tradeoff between strength and weight, and good parts aren't cheap.
So at what point is titanium going to make sense in a max effort marine engine?
The root of the problem is the weight of the valvetrain, right? You have to have the nasty cam profiles to make the power, everything else is a tradeoff between strength and weight, and good parts aren't cheap.
So at what point is titanium going to make sense in a max effort marine engine?
Chris
05-11-2005, 09:05 PM
#139
Registered
Re: Roller lifters input
From the Del West site:
"The lower mass of the titanium valves combined with the matching Del West keepers (locks, cotters) and spring retainers allow for the use of higher RPM and more aggressive cam profiles without the loss of valve control. This results in the development of broader torque curves with increased horsepower and higher RPM and power numbers."
Where it says higher RPM and more aggressive cam profiles I see more endurance at the same RPM and profile. How much more for a set compared to good steel valves? No prices on the site.
"The lower mass of the titanium valves combined with the matching Del West keepers (locks, cotters) and spring retainers allow for the use of higher RPM and more aggressive cam profiles without the loss of valve control. This results in the development of broader torque curves with increased horsepower and higher RPM and power numbers."
Where it says higher RPM and more aggressive cam profiles I see more endurance at the same RPM and profile. How much more for a set compared to good steel valves? No prices on the site.
