07/01/2025
Tech Tuesday:
After our semi viral solid roller 7.3 post last week we got a lot of questions about the benefits of solid roller lifters - you asked, we answered:
When building a serious performance engine, one key choice is solid roller vs. hydraulic roller camshaft. Both have their place—but when airflow, precision, and reliability matter, solid roller is king. Here’s why.
Solid roller camshafts give you much more control over valve events. Unlike hydraulic lifters that adjust with oil pressure, solid rollers use fixed lash. This allows much more aggressive cam profiles—without the risk of a lifter failing to follow the lobe.
Even with similar advertised duration, solid roller profiles create more area under the curve—meaning faster valve opening, longer time at high lift, and cleaner closing. That equals more air into the cylinder—sometimes 30% more—translating directly to more power.
Solid roller valvetrains also act as early warning systems. With a high quality Jesel rocker system, if lash changes, it’s not because the adjuster loosened, something else is moving that shouldn’t be:
– Cam or lifter wear
– Valve stretch (due to heat or failure)
Hydraulic systems mask those issues, hiding problems until it’s too late.
They also introduce performance variability:
– If a lifter bleeds down, you lose lift and power
– If it pumps up at high RPM, it can hold the valve open, killing compression and hurting the engine
Solid rollers eliminate that guesswork. You get a direct mechanical connection with no surprises.
In high-RPM, big-boost, or heavy-load applications—drag racing, sled pulling, or serious street builds—solid roller cams paired with quality valvetrain components (like Jesel rockers) deliver unmatched durability.
Bottom Line:
If you want max performance, precision, and reliability—especially at high RPM or under extreme conditions—solid roller is the clear winner. Aggressive cam profiles, early failure detection, and no hydraulic variables.
For full article check out our tech blog:
https://killdevildiesel.com/blogs/devils-in-the-details/why-a-solid-roller-camshaft-outperforms-a-hydraulic-roller-in-high-performance-applications