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Coils Tested with DirectHits
We found the most expensive coils are NOT the best coil to use with the DirectHits
For example, the MSD Blaster HVC coil costs $250 and misfires with the DirectHits spark amplifiers whereas the Bosch BIC290 coil costs $50, produces more power and has worked reliably with the DirectHits for over 3 years.
We also found some E-core type coils are NOT the best coil to use with the DirectHits
Even though E-core type coils transfer more spark energy to the plugs than oil filled type coils, some E-core type coils either misfire or burn out with the DirectHits spark amplifiers. Therefore, it requires using a certain HEI coil to survive with the DirectHits in vehicles that use 1 coil per engine whether the coil is an E-core or oil filled type coil. However, coils that fail with the DirectHits using 1 coil per engine may not be a problem in vehicles that use 1 coil per cylinder.
Coils tested with the DirectHits using 1 coil per engine
The coils shown below were tested with the DirectHits spark amplifiers using 1 coil per engine. The engine was supercharged with Negative Pressure Supercharging and uses an electronic distributor, HEI module, spiral core wires and NO ballast resistor. Negative Pressure Supercharging produces a much denser charge from idle to midrange than conventional supercharger air pumps. This requires using a certain HEI coil that can supply the higher current drawn by the DirectHits and fire the spark gap with the denser charge produced by Negative Pressure Supercharging.
NOTE
* E-core type coils are shown in red. All other coils are oil filled type coils.
| Coils Tested with DirectHits |
Results |
| Coils that WORK with DirectHits |
Mallory Voltmaster Mark II (1983) |
Worked reliably for 23 years or 100,000 miles (160,000 kms) until it failed in August 2006. |
| Bosch BIC290 (2005) |
Has worked reliably for 3 years and 2 months or 7,000 miles (11,200 kms) during all weather and operating conditions. Also runs cooler than other oil filled type coils we have tested. |
| Crane PS92 (2006)* |
Worked reliably for 2 years and 6 months or 6,200 miles (10,000 kms) until it failed in February 2009. |
| MSD Blaster 2 (2003) |
Works for 6-12 months or 1,000-2,000 miles (1,600-3,200 kms) but begins to misfire after this period under load or during hot weather. Also runs very hot and may burn out or explode if engine is left idling for long periods during hot weather. |
| Coils that DO NOT work with DirectHits |
Standard coil |
Misfires |
| Bosch GT40 (2002) |
Misfires |
| Echlin GX80 (2002) |
Misfires |
| MSD Blaster HVC (2002)* |
Misfires |
| MSD Blaster SS (2003)* |
Burns out after 7 days |
| Mallory Voltmaster Mark II (2002) |
Burns out after 3 months |
| Accel Super Coil (2003) |
Burns out after 6 months |
| Coils currently being tested with DirectHits |
Bosch BIC290 (2005) |
Has worked reliably for 3 years and 2 months in our 6 cylinder test vehicle and will be run until it fails. NOTE: 2 x BIC290 coils must be used with V8�s. |
| Crane PS91 (2009)* |
Has worked reliably for several days in our V8 test vehicle and will be run until it fails. |
| Last updated: February 2009 |
| Impulse Engine Technology
P/L |
PO Box 986 Randwick NSW 2031 Australia
Ph: (02) 9398 5544
Fax: (02) 9398 5644
International: Ph: +(612) 9398 5544
Fax: +(612) 9398 5644
Email Us
Inventor of Negative Pressure Supercharging
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