80's volvo penta question

[NeilT]

Evening all,
Having asked 2 official volvo penta techs and had 2 official replies "completely different" I thought I'd ask the people who will know.
I have a long history with volvo auto engines and know that an AQ131 is basically a B23. Now, apart from the obvious external changes and additions for marine use ie exh manifold, raw water pump etc and a downdraught carb what are the actual internal differences in things like crank rods pistons cam etc.
I can see possibly a different cam profile but anything else ?
Sorry if this has been done before but I cant find a definate answer
Thanks for reading
N

 

[stelican]

Evening all,
Having asked 2 official volvo penta techs and had 2 official replies "completely different" I thought I'd ask the people who will know.
I have a long history with volvo auto engines and know that an AQ131 is basically a B23. Now, apart from the obvious external changes and additions for marine use ie exh manifold, raw water pump etc and a downdraught carb what are the actual internal differences in things like crank rods pistons cam etc.
I can see possibly a different cam profile but anything else ?
Sorry if this has been done before but I cant find a definate answer
Thanks for reading
N

There is an excellent book by a Mr Beardshaw that covered this period of volvo penta development it contains all the technical data, Sorry I dont know the publisher of hand but if pushed could could find it !

 

[stelican]

There is an excellent book by a Mr Beardshaw that covered this period of volvo penta development it contains all the technical data, Sorry I dont know the publisher of hand but if pushed could could find it !

Sorry the book was called (The Mouse that roared)

 

[tinkicker0]

Pistons usually changed for a design that can cope better with constant wide open throttle/load/temps.

Cams for more low end torque.

Marine quality gasketing.

Bronze circulation pump impeller.

 

[Peanuts]

Hi

The book as already mentioned is called "The Volvo Penta Aquamatic Boat Engine by Keith Beardow, published by David & Charles. First edition 1980. ISBN 0 7153 8000 1

Hope this is of some help, it's a great book by the way.

 

[NeilT]

Guys, thanks for the information didn't even occur to me someone might have written a book.
Like I said I knew i'd get a proper answer here
Thanks again
N

 

[tillergirl]

And you can get it here

http://www.abebooks.co.uk/servlet/S...o+Penta+Aquamatic+Boat+Engine&sts=t&x=12&y=15

 

[NeilT]

and girls

 

[PCUK]

Sorry the book was called (The Mouse that roared)

Wasn't the Peter Sellers film comedy about a small European country that held the world to ransom with some sort of atomic bomb?

 

[stelican]

Sorry the book was called (The Mouse that roared)

Wasn't the Peter Sellers film comedy about a small European country that held the world to ransom with some sort of atomic bomb?

Yes that right
Come to think of it must have been in the text about the roaring mouse!