ported t/b 1st time

Reply Subscribe

Thread Tools

Search this Thread

Mar 10, 2008 | 01:36 PM

billyb

Thread Starter

TECH Resident

iTrader: (15)

Joined: Mar 2006

Posts: 962

Likes: 0

From: fl.

ported t/b 1st time

hi yes can you elaborate on the downfalls of a polished interior of a t/b the volumetric efficiency i also dulled the inside . i've just half to knife the blade just on the bottom 1/2 of the blade is that correct thanks billyb.

Last edited by billyb; Mar 10, 2008 at 01:38 PM. Reason: add

Mar 10, 2008 | 07:58 PM

TLewis4095

Banned

iTrader: (10)

Joined: Oct 2004

Posts: 1,265

Likes: 2

From: Bradenton, FL

Back in the day, we spent hours after porting heads & intakes polishing the work to a mirror finish....then modern wet&dry flow tests with super high speed video shows that with a super polished surface the air flowing along the surface actually causes a disturbance (turbulance) so the efficiency of the flow is negativley affected even though the volume may still be good. Leaving a rough, or CNC mill mark finish actually breaks up the air molecues running along the surface so they act like microscopic "ball bearings" and the efficiency is maximized. Next time you can look at a high-end set of ported heads or intake you will see the roughness on the finish is left intact for this very reason. Visit: www.Rehermorrison.com & read the "tech talk" section.....there is a ton of awesome info there free for the reading. Our techs are sent to the Reher Morrison racing engine school (I'm a graduate as well) after being with us for at least one year & proving themselves. The R&D that goes on there is simply amazing for not only almost all catagories of racing, but extensive head work for GM & other manufacturers. The mirror finish on a ported throttle body should not have as much effect on a basically stock motor, but when every ounce of HP is the goal, follow what the experts have known for years.