Originally Posted by Robbie Diesel
I agree with codprawn in that these big outboards arent really a huge leap forward in fuel economy savings over the last of the EFI 2 strokes. I just wish someone would come up with a Turbo Diesel outboard using a modern all alluminium high tech car based engine.
(Most car manufacturers are squeezing more power out of their diesels than similar sized petrol units!) Take a look at the Volvo Penta website for figures, A Volvo-Penta D12 makes 715hp burning the same 140litres an hour as that 350 Verado.! and if you take their closest hp engine to the Verado 350, probably the D6-330hp, it only uses 70 litres an hour flat out! Thats half!!!
Its a no brainer, TDCI outboards would give us instant fuel consumption savings of 30-50%.
I'm sure some of the big Outboard manufacterers are already working at it behind closed doors. Roll on
Most large(ish) marine diesels are based on truck engines, yet far exceed the power output of their roadbound cousins. IVECOs largest on-highway truck engine the Cursor 13 puts out about 500bhp, yet in a pleasure boat application that is 825. Big stuff I know, but the FIAT 2.0 litre motor, also used by Vauxhall and Saab is developing somewhere in the region of 200 horses. Of more interest to an outboard application would be the 1.6 and 1.3 Multijet versions. In a car, the 1.3 MJ which is a DOHC 16 valve variable geometry turbo is produced in some models in a 105bhp variation. As most of the big engines from 6 litres upwards are making between 50 and 75% more than the roadgoing derivatives, that would suggest a (theoretical anyway) 157 to 183 bhp.
There is already a marine version of the 2.4 litre 5-cylinder FIAT/Alfa turbo diesel that puts out 250hp.
When the Multiair petrol engines come out later this year, this new technology will give a 10% reduction in all emissions, a 10% increase in power and a 15% increase in torque. When Multiair diesel engines appear later they will enable them to satisfy Euro 6 standards without the need for any additional treatment such as AdBlue.
Just some thoughts for the future.
I'm going to lie down now in a darkened room.