Posts Tagged ‘Tomahawk’

PCV Grommet

Monday, February 8th, 2010

I finally made a little progress after two consecutive snow storms that conveniently happened to both fall on weekends. The distributor and Taylor custom fit spark plug wires were installed.  Unfortunately I’ll have to remove the intake to replace the valley pan.  I’ve decided to use an aluminum valley pan from Butler Performance.  I mistakingly left the PCV grommet in place before I dropped off the valley pan to the machine shop.  Not long after installing the intake, it quickly became evident that the grommet could not be removed without breaking apart and falling into the motor.  The ’73 fuel pump was swapped out at Napa for an ’81 style.  They are practically identical except for the direction of the fuel inlet tubes.  The ’81 style faces the opposite direction from the ’73.  To finish out the day, a rebuilt quadrajet carburetor from Sean Murphy Induction was mounted to the Tomahawk intake.


Dyno Software

Friday, December 19th, 2008

Today I finished experimenting with engine, cam, and intake combinations.  I bought some software from Ebay that I saw featured on Horsepower TV on the Spike channel.  The software is called Desktop Dyno 2000.  It allows the user to select from a variety of engines including Pontiac, big block, and small block Chevy’s.  It has factory bore and stroke combinations built in but allows adjustments in both.  Once an engine is selected, the user can manually input compression ratio or allow the software to calculate based on bore, stroke, gasket thickness, cylinder head volume, and pistion setup.  Other inputs include headers, exhaust manifolds, carburetor size, and cam configurations.

The hosts of the show tested some import that I don’t remember, but what I do remember is how accurate the software was when compared to the actual dyno results.  The software was suprisingly cheap, around $20, as it was an old version.  The calculations in the old software haven’t changed and are based on laws of physics that will always be the same so spending the extra $70 is pointless.  I’m sure there are new features and better user interfaces, but for me this software works fine.  The beauty of this software is that you can try out experimental combinations without costly and time consuming component swaps which previously have been cumbersome trial and error in the abscense of a personal dyno at your fingertips.



Tuesday, November 11th, 2008

Today I found an aftermarket intake manifold that is promised to fit under the Trans Am shaker scoop without any modifications.  It’s called a Tomahawk intake and developed by a company called Pacific Performance Racing.

Looks like the only type currently in production is a single-plane.  Many other aftermarket intakes position the shaker slightly different than stock.  For example, Edelbrock’s Performer series cause the carburetor to sit slightly lower and further rearward.  The height can be fixed with a spacer plate and the 1/4″ rearward bias is not enough for interference according to an article on High Performance Pontiac’s website.  Not sure how the Tomahawk perfoms but will keep researching and update my findings.