After 40 years our two old engines (Volvo Penta AQ150B) are definitely passed away. So we are looking for two newer ones. Can somebody inform us what sort/type of engine we should take (new or second handed)? Should it has to be Volvo Penta again or ...??
Thanks in advance for a prompt response.

I think you should look for VW marine, Lombardini, FNM, Yanmar etc, all these engines are modern common rail diesel engines. They are quiet and light in weight. I myself have a VW marine TDI-225-6, in my 24 Cabin. Excellent choice.

Or maybe Peninsular V8 diesel...www.peninsular.se I have 2 of them myself and are very pleased !!

Coronet and Volvo Penta has had a close cooperation during all years of production and I think when repowering a Volvo Penta engine should be the first choise in a Coronet.
To put a second hand engine I would suggest a single Volvo Penta AD41/DP. A diesel engine with 290 DP-drive. I guess it will perform around 30 knots. A new engine I would suggest a Volvo Penta D4 or D6 engine. 30-40 knots depending on power choise.

When considering a new engine, take the total wieght in consideration. A fellow I know has a Weekender and in this boat the D-4 performs beautifully in all aspects, but in one, the weight. The 24 foot Weekender is somewhat owerloaded in the aft. A D-6 in that boat (24 Weekender) would make the boat very heavy indeed. I would imagine that a D-4 could be acceptable in the 27 foot but the D-6 is probably going to be to heavy. Perhaps a D-3 in the new upgraded version is a better choise. The problem is when You are going at just a few knots, or going backwards, then a aftloaded boat might perform bad or even dangeursly. Try to load Your boat in accordance with the intended motor and se at what level the boat is. Remember that there are strict limits for how deep a motor is in relation to the waterlevel; risk of water entering the exhaust backwards, if the boat and motor is too deep in the water
Merry Christmas

Hello Gerard. According to my knowledge is Hans Eriksson 100% right in his writing about a single diesel engine in the Coronet 27 hull. One single diesel-engine will have very little or no influence on the eksisting draft aft of the 27 feet hull, at least max about 3-4 cm more than now. A single second-hand Volvo AD 41 in good condition together with duoprop-drive is a very good choise for a Coronet 27. The weight for a single AD 41 including DP drive are 524 kg which are close to be similar to two pc. of Volvo Penta gasoline-engines with singledrives. One have to remember that many of the Coronet 27's are from the yard equipped with two 4 or 6 cyl. Volvo gasoline-engines without having any draft-problems. Best regards and a Merry Christmas. Finn 1786.

I think you should go petrol...a single big block V8 425hp or a pair of 300hp small block V8s even 225 V6s.

The cost of diesel power is such that you will never recoup the initial outlay on running costs + petrol motors are quieter.

A friend of mine has 2 270hp SB V8s in his Seafarer II and it's good for 40+knots. If I were you I'd go single BB & bow thruster or twin V6

Keep smilin

Chris

Modern diesels are more quiet than petrol engines. Diesel are less inflammable than petrol. It is not only a matter of economy, when you choose an engine.

Diesel engines are certainly not quieter unless additional mufflers/sound suppression is used. As for petrol being more flammable, well that is true but provided good practice and common sense is employed (bilge blowers and regular maintenance etc.) incidents can and are avoided. If economy is a consideration then perhaps consider an LPG conversion (you’d also be doing the environment a favour as even common rail diesel emissions aren’t that clever : ) Yep I’m a petrol head : ) Keep smilin

Just to add to the confusion..... I have a 310hp Volvo D6 in my 27 Seafarer. 38 knots top and cruising speed at around 27-30 knots. Make sure you fit the tank(s) as far forward as possible, otherwise she will be heavy in the stern. I would say my boat is about 5cm deeper in the stern compared to the original twin petrol Volvos. There's no direct disadvantage or risks associated with this, but the waterline should be repainted accordinly and the stern platform adjusted. Mine is at a slight angle, as is the whole trim of the boat whilst not underway.