Flex
14-09-2008, 09:45 PM
Read a boat review at boat point, they did a review on a 60 e-tec(the review is a few years old now).
What struck me as very odd was the stats they produced when comparing different engines.
heres the text'
On a 4.8m Stacer 469 Easy Rider bowrider, spinning a 15-inch pitch stainless steel SST prop and pushing 830kg, the demo E-TEC 60 outperformed a Yamaha F60C on a Horizon 4750 Sea Breeze displacing 800kg. When trolling at 650rpm it averaged 4.3km/h using 0.6lt/h, compared to 4km/h and 0.8lt/h for the F60C at 700rpm, although vibration levels were higher. It planed us at 21.5km/h and 3100rpm, and cruised at 34.1km/h and 4000rpm using 7.9lt/h, compared to 31.4km/h and 7.7lt/h at the same revs. No prop ventilation occurred through full-lock figure-of-eight turns at these revs.
The wide open throttle averages were 53.6km/h and 5800rpm using 19.4lt/h,
whereas the F60C averaged 50.1km/h and 19.2lt/h at 5650rpm.
But a carbie Merc 60 on the same hull, spinning a 14-inch alloy prop and pushing 750kg, averaged 5.6km/h and 2.1lt/h while trolling at 850rpm. It planed us at 23.4km/h and 2800rpm, and cruised at 4000rpm averaging 46.7km/h and 10.5lt/h. The WOT averages were 65.3km/h and 24.6lt/h at 5300rpm. So for top end performance, the Merc 60 has it all over the E-TEC 60!
So going by those stats if you did alot of long distance cruising running around 4000rpm. the old school carby is the best option.
At 4000rpm
e-tec- 34km/h at 7.9L
carby yamaha 4 stroke 31km/h at 7.7L
Merc 46km/h! at 10L
Is the mercs superior speed solely due to the props on each outboard? and gearcase sizing? 12km/h difference is a damn lot for such small outboards.
or the test results are incorrect or im interpreting them incorrectly
What struck me as very odd was the stats they produced when comparing different engines.
heres the text'
On a 4.8m Stacer 469 Easy Rider bowrider, spinning a 15-inch pitch stainless steel SST prop and pushing 830kg, the demo E-TEC 60 outperformed a Yamaha F60C on a Horizon 4750 Sea Breeze displacing 800kg. When trolling at 650rpm it averaged 4.3km/h using 0.6lt/h, compared to 4km/h and 0.8lt/h for the F60C at 700rpm, although vibration levels were higher. It planed us at 21.5km/h and 3100rpm, and cruised at 34.1km/h and 4000rpm using 7.9lt/h, compared to 31.4km/h and 7.7lt/h at the same revs. No prop ventilation occurred through full-lock figure-of-eight turns at these revs.
The wide open throttle averages were 53.6km/h and 5800rpm using 19.4lt/h,
whereas the F60C averaged 50.1km/h and 19.2lt/h at 5650rpm.
But a carbie Merc 60 on the same hull, spinning a 14-inch alloy prop and pushing 750kg, averaged 5.6km/h and 2.1lt/h while trolling at 850rpm. It planed us at 23.4km/h and 2800rpm, and cruised at 4000rpm averaging 46.7km/h and 10.5lt/h. The WOT averages were 65.3km/h and 24.6lt/h at 5300rpm. So for top end performance, the Merc 60 has it all over the E-TEC 60!
So going by those stats if you did alot of long distance cruising running around 4000rpm. the old school carby is the best option.
At 4000rpm
e-tec- 34km/h at 7.9L
carby yamaha 4 stroke 31km/h at 7.7L
Merc 46km/h! at 10L
Is the mercs superior speed solely due to the props on each outboard? and gearcase sizing? 12km/h difference is a damn lot for such small outboards.
or the test results are incorrect or im interpreting them incorrectly