When designing a Voodoo Evolution chassis, five key factors are deemed crucial; greater torsional rigidity, increased axle travel, optimized suspension geometry, enhanced passenger protection, and light weight.

Quick view Voodoo Evolution 32R chassis photos!

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Today the availability of crate engines producing over 650 HP means hot rod chassis can be subject to massive torque that would overload original or reproduction chassis.

Boxed, stamped chassis rails provide excellent beaming strength - the ability to support vertical load – however they’re far less effective when it comes to bearing torsional loads. A chassis that twists under load compromises acceleration, braking, handling, steering, and can induce fatigue cracks in the frame and body panels.

For hot rodders seeking a weed-eating stance with adequate suspension travel, stamped reproduction chassis rails can’t achieve today’s super low ride heights without expensive re-engineering to provide increased axle clearance. And ‘generic’ pre-fabricated street rod chassis can’t optimize suspension geometry because they don’t take into consideration the different choices owners will make in terms of tire diameter, chassis rake, and ride height.

Voodoo Hot Rods chassis address many of the engineering issues faced by those seeking a high performance hot rod. We start with the basics by determining ideal aesthetics including front and rear tire diameter, chassis rake and ride height – then design the chassis from the ground up.

Voodoo Evolution chassis are then manufactured from high quality 1026 grade cold drawn seamless steel tubing, TIG welded by fully qualified technicians in sophisticated jigs.

Our chassis address many of the engineering issues faced by those seeking high performance, being designed from baseline parameters that achieve a killer low stance, with practical suspension travel. Voodoo Evolution chassis provide clearance for heavy duty components such as large 'Champ' quick-change rear axles, and offer optimized suspension geometry including 100% rear anti-squat*.

Voodoo Hot Rods incorporate unique features never available in a production street rod chassis....

Undoubtedly one the most important features of a Voodoo Evolution chassis is the fully integrated roll cage. Manufactured from the same 1026 grade seamless DOM steel tubing as the main chassis rails, it meets NHRA material specifications, dramatically increases torsional stiffness, and offers substantial occupant protection 

By 1933 Ford chassis design had evolved to feature a substantial X-member as engineers realized the greater torsional rigidity this affords. However, poor hot rodding practice over the ensuing decades often saw the strong central connection between each side of the X-member being chopped out as an inconvenience that got in the way of more powerful engines and bigger gearboxes.

This practice continued into the 1970s when mail-order hot rod parts became increasingly available, and it was more convenient to supply a component that would serve more as a transmission mount than the critical link joining the left and right sides of an X-member.

Today most street rod chassis feature an X-member fabricated from either tubing or C-section steel. However many chassis builders miss the point that the X-member is only as strong as its central link, which must be capable of transferring torsional loads from one chassis rail to the other.

Without a substantial central connection even a heavy-duty X-member serves as nothing more than an elaborate floor support.

Ideally the central connection should be the full depth of the chassis rail, or feature top and bottom links. If of tubular design the bottom link should not be a removable transmission mount as this is likely to twist and therefore not transfer torsional loads.

Voodoo Evolution chassis feature substantial central connection of the X-member, with top and bottom links at not one but two points along the chassis. Where tubular top and bottom links can't be fitted steel plate is used to reinforce the connection.

Many street rod chassis also ignore basic engineering principles when it comes to the design of mounting brackets, which ideally should be as short as possible to prevent flexing, and in-line with loads they carry.

Mounting brackets positioned at 90-degrees to applied loads are a worst-case scenario however many street rod chassis feature these despite that more efficient designs are possible.

Voodoo Evolutionchassis feature short, thick brackets to prevent flexing and integral radius rod and ladder bar mounts are positioned in-line with applied loads where possible. Click to read about the Voodoo Evolution™ 32R Chassis.


TECH PROFILE: What is anti-squat rear suspension geometry?

 

*Based on estimated center of gravity

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