ATV Race Engines

DRG Porting Services

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The chart above is an example of the flow-rate graphical representation that is recorded on every cylinder head ported.  Customers are provided with flow gains obtained as verification.  Each graph displays the intake flow rate before porting and after porting, along with before and after exhaust flow rates.

DRG, LLC.

608 Sand Road

Severn, Maryland  21144

To contact us:

Phone: 301-910-9850

E-mail: info@chad502ex.com

 

 

Every single cylinder head DRG ports is validated for flow, prior to assembly or before the head is shipped to the customer.  Unlike other shops that can not repeat flow rates, DRG consistently reproduces flow for the desired power curve on every cylinder head ported.

 

DRG’s flowbench is fully calibrated by NIST and is digitally controlled for precise valve lift.  The DRG digital flowbench uses internal electric motors capable of pulling over 600 cfm’s at over 35” of water column (H2O).   While recording flow rates and the airflow velocity, handheld pitot tubes can be used to verify port flow velocity gradients within the port to maximize all areas within the port.  Pitot measurements allows port mapping if necessary.

 

As part of the DRG porting services, every head is flow tested as part of the porting services in order to document the flow of the cylinder head before its shipped.  Each flow record is stored graphically.  Before and after port tests are done to document gains obtained.

 

Every DRG ported head gets:

· Adjusted port volume and cross-sectional area

· SSAR exhaust (optional)

· Short-side radius roll-back

· Deep pocket porting

· Unshrouding

· Guide boss tapering

· Bowl blending

· Intake guides sunk

· Seat throat proportioning

· Compression Chamber shaping

· 3 angle valve job

· New valve seals

· Flow bench tested