4.5 16V engine with rear oil sump
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4.5 16V engine with rear oil sump
I have a 4.5 16V euro engine I'm planning to convert into marine use an drop in my boat, instead of the 4.3 L V6 GM iron engine. I have already figured out most of the issues I will encounter; building a set of watercooled exhaust manifolds, installing a raw water pump and heat exchanger, bellhousing adaptor etc. But there is one thing I would like to hear some thoughts about. The oil sump on the engine is in the front, because of the placement of the cross member in the car. For the marine use, this is a bit unfortunate, because of two things.
1. It will collide with the original structure in the boat, for the original engine. It is fiberglass and wood and can be removed/changed, but I would prefer not.
2. In the boat, the engine will always have the front pointing upwards, which means that a certain amount of oil will accumulate in the back of the oil pan. I'm not sure this is good in the long run. Off course, the car can go uphill, and this will be the same, but only for a limited time.
So I'm looking a bit into building a new oil sump, with the reservoir to the rear. The starter is off course a bit in the way, but I think it will be ok.
Thoughts ?
1. It will collide with the original structure in the boat, for the original engine. It is fiberglass and wood and can be removed/changed, but I would prefer not.
2. In the boat, the engine will always have the front pointing upwards, which means that a certain amount of oil will accumulate in the back of the oil pan. I'm not sure this is good in the long run. Off course, the car can go uphill, and this will be the same, but only for a limited time.
So I'm looking a bit into building a new oil sump, with the reservoir to the rear. The starter is off course a bit in the way, but I think it will be ok.
Thoughts ?
#2
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Both the water pump and oil pump are part of the timing belt tensioning system and required to be in place the keep the engine running.
Porsche did build a few 928 S4 engines to be used in boats though.
Porsche did build a few 928 S4 engines to be used in boats though.
#3
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Check out this thread, some of the info there may help you.
https://rennlist.com/forums/928-foru...highlight=boat
Happy Holidays,
Dave
https://rennlist.com/forums/928-foru...highlight=boat
Happy Holidays,
Dave
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#4
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Put a starter on the drive aft of the coupling. It's not at all uncommon in marine applications. No "flex plate/flywheel, as the shaft coupling bolts directly to the end of the crankshaft. That will certainly let you build a sump that's deep at the rear. Remember that the pickup tube and supports will need to be adjusted to allow oil from the rear, but that's not at all difficult. I've never looked at the original sump and the mate-up with the girdle to see if it can just be turned around 180º once the starter motor is out of the way.
#5
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Th pan won't fit reversed.Another option would be to use a dry-sump system. For that, people have welded on a dropped box at the rear with a suction line on it.
You're right that the front sump system won't work for you. The crank comes very close to the stock pan and once oil builds up back there it's being fed right into the rotating assembly.
You're right that the front sump system won't work for you. The crank comes very close to the stock pan and once oil builds up back there it's being fed right into the rotating assembly.
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Put a starter on the drive aft of the coupling. It's not at all uncommon in marine applications. No "flex plate/flywheel, as the shaft coupling bolts directly to the end of the crankshaft. That will certainly let you build a sump that's deep at the rear. Remember that the pickup tube and supports will need to be adjusted to allow oil from the rear, but that's not at all difficult. I've never looked at the original sump and the mate-up with the girdle to see if it can just be turned around 180º once the starter motor is out of the way.
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If I just wanted more power, I could drop in a GM 350 engine with a four barrel carb, everything single marine part for that engine is available. But I would rather have a nice 928 engine in the boat. The boat is for fun, not really common sense.
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Is it being overly optimistic to think that a 36 year old 928 engine is going to be "NICE" ?? Boats are lots of fun when they run. Less so when they do not But sitting at the dock with the engine cover open it will be a conversation piece !!! But go for it since it will sound much better
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Is it being overly optimistic to think that a 36 year old 928 engine is going to be "NICE" ?? Boats are lots of fun when they run. Less so when they do not But sitting at the dock with the engine cover open it will be a conversation piece !!! But go for it since it will sound much better
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I would suggest that you pull the heads off and inspect the 928 engine BEFORE getting much further into this project. Corrosion of the heads and cylinder tops is very common as are scratches in the bores. When I needed a short block for a 79 I think Greg Brown took apart three engines before we had a usable block. Then sit down and list the costs of all the needed parts and machine work to refresh your 928 engine. I realize this project is probably more about the journey the destination.
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I would suggest that you pull the heads off and inspect the 928 engine BEFORE getting much further into this project. Corrosion of the heads and cylinder tops is very common as are scratches in the bores. When I needed a short block for a 79 I think Greg Brown took apart three engines before we had a usable block. Then sit down and list the costs of all the needed parts and machine work to refresh your 928 engine. I realize this project is probably more about the journey the destination.