Hi Mate, What model Volvo motor is it? push rod or o/h cam. I took mine out and shoed in an SD33 nissan Diesel. very happy.

The Volvo motor is a very good motor, if you wanted to do it up you would save a lot of work, as another engine might not take prolonged revs..

Your Volvo should pull about 5,200 rpm Max and max 4,600 cruising at full noise.  A gemini will get no where near those revs.

Cheers Rod.

its a push rod one mate(old)

he has fully rebuilt the engine already including the head.

keep pinging badly and is always a bitch to start when warm, he has tried all sorts of things with the pinging and even had a mech look at it.

winds over very slow, even with twin batt and a new starter.

was the bolt pattern the same for the bell housingor did you have to get an adaptor plate made? i told him as well to put in a deisel.

did you lose performace with the deisel?

his is in a 17ft half cabin and gets 20-22knts max.

cheers ron 

Sounds like an AQ 100, 110 or 115 or 120, there was an early 90 hp. Pinging (pinking) can be caused by too low octane fuel, they are designed to run on hi octane, leaded fuel. Timing can also cause pinking. They also have high compression.

Your two Strombergs may need a "fuel miser" kit through them also.  

Hard starting could be distributor is too advanced, coil, condensor, points etc failing when hot, or a bad earth or too smaller cables.  To change motors you will need to modify bell housing, exhaust, create heat exchanger, modify flywheel, manifold, water pick-up, sea water cooling pump, sort out an oil cooler, and get an adaptor plate. (I made my own everything so cost was low)

An sd33 weighs 600kg so would be too heavy on the bum.

You could try and get hold of an AQ145 motor, bell housing is the same, has it's own heat exchanger, OH cam, more power and runs on unleaded and lots of the old parts will fit it.

People have fitted Holdens and Fords and all sorts of motors, but the best motor to suit your sterndrive is the Volvo.

The Volvo cars have the same engines with a few mods to cam, carbies and valves, head etc.

I think you would be best spending a bit more on the Volvo, then you will have a top motor.IMO  

yer mate he told me it is a B20 AQ130.

tried the additive in the fuel,timing,changing carbs from one single to the origanal twins.

i reckon he should piss it off, put on a pod and an outboard.

cheers for the info mate

.

.

95 octane fuel and knock 2 degrees of the recomended timing if it still pings with 95 octane.

diesel is much better but overall much slower due to the max revs of the diesels

 dude pull the donk out, & rebuild it yourself.. easy as those motors r piece of piss... parts r readily avail. only cost will be engine bore or block acid dip!! get rebuilders to do this !!!! cheapest way and fastest too ...

Have you checked out the balance weights in the dizzy?  how's the rotor button? how's the cap, does it show signs of "tracking" watch it in the dark.

With the correct prop you should be able to get 5200rpm and run at a max 4,800 rpm.

If you have done the head up and the twin carbs havn't been sitting in the shed drying out for years, yer better off with the twin carbs.

there is a fuse block at the back of the head  , this is your ignition fuse, it's a wire, so if it's dirty this could be a starting problem.

There is a junction for all of  the cables below the deck or in below the gunwhale, check that the connections are clean and not getting wet.

Salt is your electrical enemy.cheers.

Mate when that motor was new, in a car, it would thrash the gutz off a Dodge phoenix with a 318 V8. seen it.

Yes it sounds as tho you've done a fair bit to it, are the two carbies sync'd? and is the fuel pump keeping up pressure?.

Good seal between inlet manifold and head? and carbies to manifold? Who did the tappets and are they spot on?

"pinging" is pre ignition, so the ignition timing or the fuel octane rating is incorrect.

Maybe the crank is pressed together faulty or compression is to high

Wrong plugs or wrong gap can also cause "pinking".

I feel that it's a timing issue, crank is one piece, compression about 10 to 1 from memory.

To me it sounds like the cam timing might be one tooth out or compression too high.

Does it try to continue running for a couple of seconds after the key is turned off?

Iv'e had about 6 of em and they all "run on'' anoying as it is.

Ended up using colder plugs and only Bosch.

nah boys, it dosent run on, shuts down nicely.

it only pings under load(in the drink) on the trailer it seem fine and revs not a problem.

Have a look at the dizzy if the shaft bearings have play in them

Try an electric fuel pump, sounds like starving for fuel under load.

Have had volvo aq140a motor in the past. Had issues and found out that I had moved the inline fuel filter/water seperator into a position that was slightly higher than the carby. this had the effect of starving the carby of fuel when the boat was in the water and under load .I moved it so it was easier to sight for water in the fuel.  Didnt happen in the driveway when i was searching for the problem as there was enough fuel flow because it was not under load , only at sea under load.

Sometimes the simple things are overlooked

Mate I may still have  three of these motors.... I had one in the boat running etc another I purchased just had a complete rebuild before I converted to my mercruiser, and heaps of spares.

I say may have as It was stored with a colleage and I'm not sure if it is still available.

I've sent him a text and if you're interested will follow up.

PM me if you want me to look further.

From memory it was an AQ145 I had brand new heads etc etc

Also have some web site where you should be able to download the entire manuals for them..

cheers

That'd be the go, AQ145 is overhead cam, develops 135hp and is fresh water cooled and will fit your bell housing, drive plate is the same, they go well on a 280 or 200 leg. Not suitable for a 100 leg.

hey guys

after some advice from you members, my cousin fitted a electric fuel pump and tested the boat out again today.......

a bit of timing ajustment and the pinging is gone!! looks like it was a fuel problem so thanks for all your help guys.

the only problem now is it seems to flood a bit on the restart after its been going for a while, a bit more fine tuning and see how he goes, burnt the starter out today so have to find a new one before we can test again.

thanks to every one that helped out.

ron

 drop an injector kit in it! solves your problems dude !!! then get the fuel running rich to start then see how you go... lean it out slightly till your happy !?

Gumtree one for spares?

Bit sad looking