solid roller cam vs. hydraulic......power gains with the solid???
Thread Starter
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
solid roller cam vs. hydraulic......power gains with the solid??? All else being equal, (cubic inches, compression, parts, head flow, intake, etc...).....how much power would an engine gain going to a solid roller over a hydraulic?
Street car ONLY, Roll racing ONLY, 50-180mph
If you want some specifics:
447ci resleeved LS7 block
Ported LS7 heads
11.5:1 compression
250 progressive DP shot
LS7 intake or a sheet metal
.
Street car ONLY, Roll racing ONLY, 50-180mph
If you want some specifics:
447ci resleeved LS7 block
Ported LS7 heads
11.5:1 compression
250 progressive DP shot
LS7 intake or a sheet metal
.
zero.
now, if you change the motor up for extreme RPM that the hyd lifters cant handle.. and/or started running such extreme lift that the hyd lifters cant handle the springs....
THEN you would gain by going to the soild..... only because you could then use what you have in the cam/heads...
until the hyd becomes a limiting factor, in reality, id say that the hyd gives MORE power for a street driven car.... why? because you wont have lash to move around on you.. because we all know damn well that someone isnt going to check their lash as often as they should on a regularly street driven car... that extra lash in there will end up costing more then the soild roller gives you..
and the more aggressive ramp advantage a solid roller gives is minimized on the LS1 due to its large base circles, and aggressive hyd lobes available.
really, for a street car, you gain nothing.
now, if you change the motor up for extreme RPM that the hyd lifters cant handle.. and/or started running such extreme lift that the hyd lifters cant handle the springs....
THEN you would gain by going to the soild..... only because you could then use what you have in the cam/heads...
until the hyd becomes a limiting factor, in reality, id say that the hyd gives MORE power for a street driven car.... why? because you wont have lash to move around on you.. because we all know damn well that someone isnt going to check their lash as often as they should on a regularly street driven car... that extra lash in there will end up costing more then the soild roller gives you..
and the more aggressive ramp advantage a solid roller gives is minimized on the LS1 due to its large base circles, and aggressive hyd lobes available.
really, for a street car, you gain nothing.
Originally Posted by WKMCD
I'm running the revised LS7 GM performance hydraulic lifters in the 402 we're building. They're used to 8k RPM in the Cadillac racing engines.
1)The lifter that was revised for use in the LS7 that was used in production
2)The GM performance lifter that never came in a production engine.
Originally Posted by DONAIMIAN
FYI there are two lifters available
1)The lifter that was revised for use in the LS7 that was used in production
2)The GM performance lifter that never came in a production engine.
1)The lifter that was revised for use in the LS7 that was used in production
2)The GM performance lifter that never came in a production engine.
I used to see 30+ rwhp gains going to solid roller. I would go Morel lifters and a 670 lift hyd cam. I have a 402 with this combo, just getting it broken in and then we'll get some numbers.
Thread Starter
TECH Veteran
Joined: Dec 2001
Posts: 4,117
Likes: 0
From: Ft. Lauderdale, FL, USA
Originally Posted by MrDude_1
zero.
now, if you change the motor up for extreme RPM that the hyd lifters cant handle.. and/or started running such extreme lift that the hyd lifters cant handle the springs....
THEN you would gain by going to the soild..... only because you could then use what you have in the cam/heads...
until the hyd becomes a limiting factor, in reality, id say that the hyd gives MORE power for a street driven car.... why? because you wont have lash to move around on you.. because we all know damn well that someone isnt going to check their lash as often as they should on a regularly street driven car... that extra lash in there will end up costing more then the soild roller gives you..
and the more aggressive ramp advantage a solid roller gives is minimized on the LS1 due to its large base circles, and aggressive hyd lobes available.
really, for a street car, you gain nothing.
now, if you change the motor up for extreme RPM that the hyd lifters cant handle.. and/or started running such extreme lift that the hyd lifters cant handle the springs....
THEN you would gain by going to the soild..... only because you could then use what you have in the cam/heads...
until the hyd becomes a limiting factor, in reality, id say that the hyd gives MORE power for a street driven car.... why? because you wont have lash to move around on you.. because we all know damn well that someone isnt going to check their lash as often as they should on a regularly street driven car... that extra lash in there will end up costing more then the soild roller gives you..
and the more aggressive ramp advantage a solid roller gives is minimized on the LS1 due to its large base circles, and aggressive hyd lobes available.
really, for a street car, you gain nothing.
.
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
Topdon ONE vs. Artidiag 800 BT2: Which is the Diagnostic Tablet For You?
Pouria Savadkouei
Gas Monkey Built a 6-Wheel Ferrari Testarossa With a Corvette LT4 Engine
Verdad Gallardo
7 Most Reliable High-Performance Engines GM Has Ever Built
Verdad Gallardo
Amazing '71 Camaro Restomod Is Modern Muscle Car Under the Skin
Verdad Gallardo
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
On The Tree
Joined: Aug 2006
Posts: 140
Likes: 0
From: Denver, CO
While we're on the subject of hydraulic rollers, I have a question regarding solid roller lifters. When you're checking for pushrod length, etc. , your supposed to use a solid lifter even if you are using a hydraulic lifter in your actual application, so you get an old solid lifter to do your measurements. The problem is, there aren't a whole lot of them around for the LS family. Can SBC solid lifters be used? There must be a million of them in junkyards. Stupid question I know, but i don't know where else to ask it.
Originally Posted by silicone boy
While we're on the subject of hydraulic rollers, I have a question regarding solid roller lifters. When you're checking for pushrod length, etc. , your supposed to use a solid lifter even if you are using a hydraulic lifter in your actual application, so you get an old solid lifter to do your measurements. The problem is, there aren't a whole lot of them around for the LS family. Can SBC solid lifters be used? There must be a million of them in junkyards. Stupid question I know, but i don't know where else to ask it.
As far as a gain with a solid roller in the poster's app, I have zero experience in LSx solid rollers. However, the gains have become smaller and smaller in general. The LSx has awesome geometry in regards to valvetrain stability. That said, I don't think it would be worth it for a street racer ($-wise). I'd find bigger jets and smaller pulleys
.Whatever you do, find someone with experience in this arena and make sure they know what they are doing. A properly setup SR is going to cost some change, but an improperly setup SR will cost you an engine.
Ryan
