by moore1 | Sep 30, 2018 | MGI News Briefs |
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by moore1 | Sep 9, 2018 | News |
By Martha Maglone: According to Chris Beardsley of TorqStorm, the Michigan supercharger firm produced and supplied more kits by July 2018 than it accomplished during the entire year of 2017. Formed in 2009, TorqStorm is a subsidiary of Accelerated Tooling founded by Chris Brooker and Scott Oshinski, both of whom served their apprenticeships in the tool and die profession. Now both companies have outgrown their current 10,000sq ft premises in the Grand Rapids area and on 17 September are moving to a larger 25,000sq ft building, about two miles from their current location. Plans for the new building will include the addition of 8 to 12 new machining centers and a dynamometer facility in due course. Tuner kits Access to young dynamic companies is an interesting place to be. Perpetually in flux, they are like living streams, shifting and changing with new ideas. In the interests of better outcomes, each decision at TorqStorm involves the collaboration of five individuals—each consideration receiving full measure of devotion. Given their latest focus on Tuner kits, Chris Beardsley reports they are designed for the Hemi (2003 to 2018), Camaro (2010 to ’15), GTO (2004 to ’06) and Silverado (1999 to 2013 and 2014 and later). They each sell for between $2,800 and $3,500. “Compared to the complete kits available for around $6,500 from rival manufacturers, our Tuner kits”, explains Beardsley, “allows the customer or installing dealer to select the remaining key components that best suit the project and goals and budget. Even if you purchase the highest quality parts, say, an intercooler ($800), fuel pump ($500), and injectors ($350),...
by moore1 | Sep 6, 2018 | News |
The primary reason for selecting an aggressive camshaft profile is to bolster the inefficiencies of a cylinder head. The more aggressive the cam profile, the more spring loading is required to keep the lifter in contact with the lobe. Aggressive cam profiles are generally judged unnecessary for use with efficient cylinder heads. For this reason, we favor returning to established profiles because they are less abusive on valve springs. Given an efficient cylinder head, a milder profile camshaft will make just as much horsepower. The proof of this is easily demonstrated by back-to-back dyno testing. Roller lifter failures: Inadequate valve springs are the major cause of roller lifter failures. They enfeeble the valve train, allowing the lifters to be thrown over the nose of the cam lobes, damaging or crushing their needle roller bearings on the impact of landing. If stronger spring loadings are necessary and the durability of the needle rollers is in doubt, use roller lifters with bushings instead of needle bearings. Beehive valve springs: A Beehive valve spring resembles the shape of a whiskey barrel. These springs are frequently used in applications where clearance is at a premium, usually between the underside of the rocker arm and the outer edge of the spring retainer. They are also desirable in the quest for lighter moving parts. The Beehive’s narrow top end adopts a smaller retainer, thus achieves a lighter spring assembly. Beehive springs are commonly used on late-model Ford and LS road-going engines. The LS factory-spec camshaft opens the valves to around 0.530in. Given its stock 1.7:1 rocker ratio, Erson’s aftermarket camshafts with 0.340in...
by moore1 | Sep 4, 2018 | News |
By Archie Bosman: Valve springs have two primary tasks: first, to close the valve after the camshaft opens it and, second, to maintain proper valve clearance, also known as valve lash. Why valve clearance is required for solid tappets (lifters) Valve clearance, or tappet clearance, is the gap between the tip of the valve and the rocker arm when a solid lifter is positioned on the base circle of the camshaft. This clearance accommodates thermal expansion created by engine heat. Metal expansion rates differ between the block, heads, pushrods, valves, etc., and a gap commensurate with the collective expansion is set accordingly. Exhaust valve clearance is often greater than that of the intake valve as it runs hotter and, therefore, grows in length, reducing valve clearance. Unlike solid tappets, hydraulic systems operate with zero clearance. Inadequate clearance As the valve seat wears, the valve moves slightly upward in the cylinder head, reducing valve clearance. If clearance vanishes and the valve does not close fully, compression is lost. Furthermore, escaping hot combustion gasses burn the valve head. Similarly, when combustion occurs on race engines, heat and pressure can distort the valve head, cupping it and pushing the valve upwards through its seat, thus consuming some of its clearance. On overhead cam engines, which have fewer valve train components to absorb deflection during combustion, the effect of lost clearance can be evidenced by a little shock imprint on the camshaft’s base circle caused by the lifter. Excessive clearance In contrast, excessive clearance is detrimental to the entire valve train. As the bigger gap builds momentum, the rocker pounds the valve tip....
by moore1 | Sep 3, 2018 | News |
By Dave Hamer: I joined Benetton in 1988 when they decided to create an R&D department to support their Formula One active suspension ambitions. Both Lotus and Williams had already seized the moment, pushing well ahead with similar programs. Though Benetton was also running an Active test car, they employed a staff of only 80, considerably fewer than the other leading teams. The initial system was developed using various Citroen hydraulic parts, including accumulators and a pressure control valve. The hydraulic power was generated by a Sunstrand gear pump, similar to the high pressure oil pump of a central heating boiler, which Lotus also used at the time. However, these pumps were barely adequate for F1 use; operating at 2,000psi-plus, they required constant attention. The events that led to Benetton’s active suspension and the system’s major components The advent of aerodynamics and particularly ground-effect brought new challenges to suspension design. Ground-effect relied on the car running at a low consistent ride height and, as such, generated huge downforce and cornering power. Notably, spring rates had increased to 3,000lb/in., making the suspension almost solid. Yet due to tyre squash, the car’s ride height still changed with the car’s speed and its mechanical grip was poor. The solution came in the form of new technology known as Active suspension, which replaced the springs and dampers (mostly coil-over-shocks) and anti-roll bars with hydraulic actuators (rams) controlled by a computer. The system employed a pump to provide the pressurised fluid which was piped to a computer-driven valve (a moog servo valve) at each corner of the car. This either directed fluid to the...
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