BBC Hyd Roller Lifter Lift
06-18-2017, 09:39 AM
#11
but to answer your question on high rpm hydraulic vs solid roller tappets, Lunati has the tappet for that
06-18-2017, 02:15 PM
#12
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High RPM Hydraulic Roller Lifters - Lunati Power... these will run high rpm without incident.. 7000 isn't unheard of.. open your wallet
06-21-2017, 10:41 AM
#14
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Short bursts, you can get away with a lot.
And as far as 7,000 rpm, I would assume you are talking about relatively short runs (30 seconds or less).
Running a constant-load at 7,000 rpm in a performance boat application requires VERY substantial components.
I would stay under 6,000 with hydraulics. 7,000 screams SOLID to me.
Just my 2 cents.
MC
And as far as 7,000 rpm, I would assume you are talking about relatively short runs (30 seconds or less).
Running a constant-load at 7,000 rpm in a performance boat application requires VERY substantial components.
I would stay under 6,000 with hydraulics. 7,000 screams SOLID to me.
Just my 2 cents.
MC
06-22-2017, 12:32 AM
#15
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i run my SC 565 to 7000+ almost every time out for short bursts. using Morel .903 hydraulic lifters. cam is ,680/.690 @ 256 and 264 @ .050. i do have Jesel shaft pro rockers. never run sustained high rpm for long because of accelerated wear. rebuild engine every other season, about 110-120 hrs.
06-23-2017, 12:37 PM
#16
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I'm perfectly happy occasionally adjusting lash and visually inspecting my setup VS dropping $1k on hydraulic specialty lifters and trusting the gods at 7,200rpm.
BBC valvetrain is not particularly stable at 7k+ unless a LOT of money is spent on girdling or shaft mounted rockers. I regularly have to weld up and remachine BBC race heads that have suffered bent/pulled out studs/broken stud bosses, etc. I did a set of ProLine heads last fall that had 2 completely broken out bosses on one side and 3 on the other and this motor ran full girdles as well.
Hydraulic lifters are a "convenience item" in my book. They allow you to skip maintenance intervals by adjusting to accomodate wear/thermal expansions and DAMAGE to the components. I like to check lash and SEE everything. Check stuff. When ONE has more (or less) lash than the others, it is a CLEAR INDICATION that you have an issue to search out. Hydraulics hide these issues until they become nasty.
You guys do what you want to do.
If I'm spinning a stud-rocker BBC 7000+ then I'm runnning solids, I'm checking them on a regular basis. Spend the money you'd pay for a set of $1,000 Morels on some valve covers with removable lids.
m
BBC valvetrain is not particularly stable at 7k+ unless a LOT of money is spent on girdling or shaft mounted rockers. I regularly have to weld up and remachine BBC race heads that have suffered bent/pulled out studs/broken stud bosses, etc. I did a set of ProLine heads last fall that had 2 completely broken out bosses on one side and 3 on the other and this motor ran full girdles as well.
Hydraulic lifters are a "convenience item" in my book. They allow you to skip maintenance intervals by adjusting to accomodate wear/thermal expansions and DAMAGE to the components. I like to check lash and SEE everything. Check stuff. When ONE has more (or less) lash than the others, it is a CLEAR INDICATION that you have an issue to search out. Hydraulics hide these issues until they become nasty.
You guys do what you want to do.
If I'm spinning a stud-rocker BBC 7000+ then I'm runnning solids, I'm checking them on a regular basis. Spend the money you'd pay for a set of $1,000 Morels on some valve covers with removable lids.
m
