Posted By: 1967dartgt
Flat tappet combos - 12/12/12 03:45 AM
With todays oil, why do people still use these cams? If you want a streetable combo why not a hyd roller?I think you can make as much if not more with a hyd roller. 
Flat tappet combos
Posted By: bobs66440
Re: Flat tappet combos - 12/12/12 03:56 AM
Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine.
There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change.
There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change.
Posted By: 1967dartgt
Re: Flat tappet combos - 12/12/12 04:00 AM
Quote:
Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine.
There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change.
Factory cars go 100,000 mi plus with no problems with hyd rollers. I have never heard of a hyd roller failing, solid yes but a hyd roller no.
Posted By: fishy340
Re: Flat tappet combos - 12/12/12 04:04 AM
There getting real popular these days.
Posted By: bobs66440
Re: Flat tappet combos - 12/12/12 04:36 AM
Quote:You are correct. The hydraulic rollers are much more reliable than the solids.Quote:
Hydraulic or solid rollers have their own dangers. If you do a search you will find a growing number of posts and complaints about rollers disintegrating and releasing tiny needle bearings free to take the scenic route through your engine.
There's nothing wrong with a flat tappet setup as long as it's broken in properly using the proper oils/additives. And it's a good idea to run a zinc additive after break-in with every oil change.
Factory cars go 100,000 mi plus with no problems with hyd rollers. I have never heard of a hyd roller failing, solid yes but a hyd roller no.
Posted By: 68 HEMI GTS
Re: Flat tappet combos - 12/12/12 07:46 AM
i am unimpressed with the hyd roller i put in my 440. since then I've been searching for dyno #'s on Big block mopars with hyd rollers on the net. looks like they all start to give up around that 5800 mark give or take a few hundred rpm. that's about where mine fizzles. it runs like a bear up till that point. a set of beehive's might help it but im pretty disillusioned. it'll twist higher but its just not there. i think they're perfectly fine for some one who just want to cruise their car around. or even a low rpm stroker. i hate to give up on mine because it wasn't a cheap proposition, but it will probably be coming out this winter for a solid.. unfortunately it wont be a easy swap with my home made valley tray... got a .557 cam brand new in the box, thinking that might give it the kick im looking for.
Posted By: 383man
Re: Flat tappet combos - 12/12/12 08:17 AM
One thing to remember is most stock factory cars with hyd rollers are not raced and they dont worry about valve float and lifters breaking. At least not like our hot rods. I wanted a solid cam in my 63 which is a 99% street car but I did not want to run the spring pressure I should run with a solid roller so I would not have to worry about valve float and roller lifter wear. So I went with a solid flat tappet and run much less spring press then a roller. I do know many do run solid rollers on the street and some have had lifters break and cause eng damage and some have not. I figured if I ran a roller I would want to inspect my lifters every 3000 miles or so. So I just bought a solid cam from Dwayne Porter that he Nitrided and I use the zinc additive and the Valvoline racing oil which has alot of zinc. I have had no problems at all. In fact I have never had a cam lobe wipe on me. I am not knocking rollers as I know I could make more power with one and if my car was race only I would use a roller. I just did not want the worry about the lifters coming apart in time. Ron
Posted By: shoebox
Re: Flat tappet combos - 12/13/12 08:25 PM
Quote:
i am unimpressed with the hyd roller i put in my 440. since then I've been searching for dyno #'s on Big block mopars with hyd rollers on the net. looks like they all start to give up around that 5800 mark give or take a few hundred rpm. that's about where mine fizzles. it runs like a bear up till that point. a set of beehive's might help it but im pretty disillusioned. it'll twist higher but its just not there. i think they're perfectly fine for some one who just want to cruise their car around. or even a low rpm stroker. i hate to give up on mine because it wasn't a cheap proposition, but it will probably be coming out this winter for a solid.. unfortunately it wont be a easy swap with my home made valley tray... got a .557 cam brand new in the box, thinking that might give it the kick im looking for.
What are those blue rockers?
Posted By: 68 HEMI GTS
Re: Flat tappet combos - 12/13/12 08:49 PM
Quote:Quote:
What are those blue rockers?
indys
Posted By: pittsburghracer
Re: Flat tappet combos - 12/13/12 08:56 PM
Quote:
With todays oil, why do people still use these cams? If you want a streetable combo why not a hyd roller?I think you can make as much if not more with a hyd roller.
35+ years of using solid lifter cams and never hurt one yet so why change. The biggest one being a 695 lift mushroom tappet. I have hurt a couple of roller cams in the past 20+ years.
Posted By: mshred
Re: Flat tappet combos - 12/13/12 11:36 PM
I ran hydraulic rollers in two engines now in my scamp...Both made great power where it was SAFE, but were very RPM limited, and after two dropped valves at both 6200 and 6500 rpms, I refuse to ever use another hydraulic anything in any of my motors.
Considering how much money it is to retrofit a hydraulic roller into most small blocks and big blocks, you are better off going solid roller...or just stay flat tappet...Im going solid flat tappet, and my LA is a factory roller block! Im just tired of dealing with the b.s. that hydraulics give with rpm
Considering how much money it is to retrofit a hydraulic roller into most small blocks and big blocks, you are better off going solid roller...or just stay flat tappet...Im going solid flat tappet, and my LA is a factory roller block! Im just tired of dealing with the b.s. that hydraulics give with rpm
Posted By: StealthWedge67
Re: Flat tappet combos - 12/14/12 05:28 AM
Most everything I've read suggests that a solid flat tappet will outperform a hydraulic roller. I still believe that if your goal is a street/strip motor that will make good power, be trouble free and and live for years; an aggressive solid flat tappet makes a very strong argument.
Posted By: mopartuner
Re: Flat tappet combos - 12/14/12 10:40 AM
Quote:
Most everything I've read suggests that a solid flat tappet will outperform a hydraulic roller. I still believe that if your goal is a street/strip motor that will be make good power, be trouble free and and live for years; an aggressive solid flat tappet makes a very strong argument.
