Home Home
Geo Storm Performance Products Storm/Impulse Performance Parts
My Geo Storm My Geo Storm
My Geo Metro My Geo Metro
My Ford Cobra My Ford Cobra
Projects Web Projects
Solar and Alternate EnergySolar and Alternate Energy
Research articlesResearch information
Links Links
Online Resume Online Resume
Contact Information Contact Info

Geo Storm Isuzu Impulse Stylus Performance Parts shopping cart
My shopping cart

Storm Home - Mods - Specs - Research - Blog - History - Links - RTR Policies

Share |

Porting the Head, Intake assembly and Exhaust

Intake Head Porting
I gasket-matched the head, intake assembly and Exhaust. It took a long time to complete-about 30-45 minutes per port on the head alone.
I took measurements with a digital caliper so that I could be as close as possible since I didn't have a flowbench available. Here are the measurements before and after for the intake:
Wide x High
Before: 48.41mm x 44.45mm   48.24mm x 44.62mm   48.48mm x 43.80mm   48.25mm x 43.94mm
After:   50.11mm x 46.16mm   50.05mm x 46.12mm    50.10mm x 46.21mm   50.09mm x 46.16mm
Exhaust Head Porting

For some reason, I only took one measurement before I started porting the exhaust side:
Before: 24.26mm high x 40.03mm wide New measurements on all holes:
26.22mm x 43.07mm   26.15mm x 43.11mm   26.25mm x 43.17mm   26.14mm x 43.17mm
Intake Secondary Porting
The secondary intake assembly is the bottleneck. The ports on the head side are around 2mm smaller than the head ports are. I ended up removing around 5mm of material just to get it port matched with the new head porting.
Wide x High
Before: 45.46mm x 43.20mm   45.58mm x 43.27mm   45.75mm x 43.58mm   45.74mm x 43.73mm
After:   50.26mm x 46.65mm   50.51mm x 46.60mm    50.46mm x 46.57mm   50.26mm x 47.24mm
Exhaust Manifold, Turbine Housing and Wastegate
I opened up the exhaust manifold ~2mm per port to match the head ports. Porting the manifold was tougher do to it being Steel.
That goes for the Turbine housing aswell. I opened it up ~2mm for a total of 46.61mm, and the wastegate openning ~1mm for a final of 18.06mm.

Geo Storm isuzu impulse performance parts