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SMALLER CAMSHAFT.and SUPERSTOCK 28-Dec-2005

We are trying a smaller grind on the camshaft. We were stuck when the engine was being freshened and the hurricane hit in America. The 55mm camshaft in the engine had some worn lobes and needed to be replaced so we ordered the parts from America but the parts never came because the cam manufacturer was underwater in the hurricane. This left us in a predicament but Malcolm from CamTech could rescue us by regrinding the old cam. We have thought about altering the valve timings for a long time, so now seemed like the opportunity to experiment without loss because we had no choice. And regrinding the cam is a lot cheaper experiment than buying a new 55mm cam. So we settled on a grind and assembled the engine. The smaller cam has altered the carburetion requirement significantly so we are sneeking up on the new tune. On the Dyno the engine made more torque and more power than the Holleys and used 60 horsepower less fuel doing it. The boxing day meeting at WSID was our first race meeting with the new cam and the engine was set with a soft safe tune because The Shrinker was not able to attend the meet. The engine performed good and we look forward to sneaking up on the new combo.

We are having a go at SuperStock

The SuperStock classes have caught our interest and the car has been configured to run in A/Gas Automatic. SuperStock is a different form of racing where you run on a nationally set handicapping system and the first car to the end (legally) wins. The advantage over SuperSedan is that you cant break out. The disadvantage is you have to be able to go at the top pace in Australia. SuperStock is a weight per cubic inch handicapping class. The current handicap for our class is 8.39 seconds. The car can run under this index so it should be competitive and fun to do the class.

 

Sydney Bracket Meeting 17th July 2005
We tested  a new design of transfer slot in the carburetors.
When this was combined with new jetting and ignition timing settings the performance improved. The first run was done as a base for the day and subsequent runs were testing different tune settings.
The carburetors have not been altered in design since conception but the way to tune the engine is what has to be experimentally found.
We have reduced the ignition timing further and leaned the engine off a bit more and now the car is accelerating to 100 MPH in 2.55 seconds where as its previous best was 2.80 seconds.
This is a good indicator of the improved engine performance.
The data logger shows the tyre grip as the same as when it ran its best numbers with Holley carburetors so the performance increase is due to increased engine power.
We still have some top gear tuning to finalise where we will balance the bowl vents for the scoop characteristics. The freshening of the engine and torque converter after next meeting will help us to benefit from the increased power through top gear as well.

Brett Curnow

These files work best when you download them to your harddrive. Then view them

This is a BIG burn-out
Bracket meet July 2005 WSID (2 Mb)

Burnout from Nitro's 2005 (2.5 Mb)
1st Qualifying round
Thanks to Thirteen Twenty Productions

2nd run from Nitro's 2005 (2.5 Mb)
Thanks to Thirteen Twenty Productions

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