O P E L   M O T O R S P O R T    C L U B


Engine Performance

  • Suggested articles, sometimes including step-by-step procedures, are indicated with orange colored text. You can also submit YOUR Opel TechTips, for consideration by the Editor of the OMC Blitz, to: joinomc@opelclub.com
  • Additional performance can be obtained, with installation of freer-flowing exhaust headers (or "Sprint" manifold from 1975+ Opel), and a wider exhaust system towards the rear of the car. Be sure that any modifications are custom-made for the car, as the GT's underbody tunnel areas are narrow and mismatched components can crack from vibration and uneven harmonics.

How to Order: Reprints of Individual OMC Blitz issues, can be ordered by mail from the OMC Treasurer (3824 Franklin Ave, La Crescenta CA 91214) for $2.00 each (cost includes postage). This offer is subject to availability.

Dec 1998

Diagnosis of source of exhaust smell in GT, 2 pages
Mentions as possible causes: Cracked head pipe connection at manifold flange, and worn or missing rubber seals/gaskets on rear of body. Also suggests checking for a gas tank vent hose leaks, and using small amount of oil or diesel in carb at idle to spot leak (when car smokes).

Nov 1998

Exhaust systems modifications, 1 page
Joe B. describes a higher performance fabricated GT exhaust system of 2" pipe and Walker DynoMax muffler, custom bent from the 2-into-1 "Y" on the stock head pipe, with chrome end tips from ANSA. Discussion of pros and cons, of larger 2.5" pipe also.

Nov 1997

Pacesetter Header Source, 1 page (illustrated)
Exhaust Headers by Pacesetter of Phoenix, AZ listed, part numbers are #70-1057 for the 1.9 liter GT and #70-1058 for the 1971-75 Manta. Note: Not known if these are still currently available.

Jan 1996

"Performance Exhaust Systems for Your Opel," 2 pages (illustrated)
Bob L. describes upgrades for Opel exhaust systems, including installing the 1975 "sprint" exhaust model, followed by larger 2" diameter headpipes, tri-y headers, and other modifications.

Nov 1987

Aluminization of Exhaust Headers, 1 page
Rick G. notes a source, for a process where molten aluminum is sprayed onto headers to resist corrosion; QuickSand in Stanton, CA.

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