Replcing 5.7gxi with new 5.3 V8-350C

[stephanies]

I have a 5.7Gxi motor used in saltwater. Its a pretty ancient design and very high maintenance. How easy would it be to slot in the new 5.3 Gen V V8-350C? it has closed cooling and is state of the art and lighter than the ancient 5.7 units. So much more modern, VVT, much easier to maintain.

 

[Scott Danforth]

So you think a new motor with variable valve timing is easier to maintain than your old motor? You obviously do not turn a wrench. Newer yes, lighter - marginally (not enough to notice)

 

[Bondo]

How easy would it be to slot in the new 5.3 Gen V V8-350C? it has closed cooling and is state of the art and lighter than the ancient 5.7 units.

Ayuh,.... The 5.3l is closer to 327, than 350,....

Where ya gettin' this motor,..??

Is it fully dressed with Marine accessories,..?? By whom,..??

I didn't know Volvo was usin' the 5.3ls,.....

 

[JustJason]

I have a 5.7Gxi motor used in saltwater. Its a pretty ancient design and very high maintenance. How easy would it be to slot in the new 5.3 Gen V V8-350C? it has closed cooling and is state of the art and lighter than the ancient 5.7 units

Maintenance is going to be no different between the 5.7 and the 5.3. They both need oil changes, they both need filter and impeller changes. If anything, the 5.3 is actually going to be more maintenance and more expensive because now you have to deal with emissions and catalytic converters and oxygen sensors. Where on the 5.7 you do not.

Both engines have closed cooling.

The weight difference between the 2 engines is negligible, about the same difference as 1 less small teenage passenger.

The biggest difference between the 2 engines is the 5.7 has 50 years of proven reliability. The 5.3 is brand new, so it will be a guessing game as to "how good" it actually is in the long run.

 

[Tail_Gunner]

If this 5.3 is electronic injection it will cost you quite a bit for the conversion...VVT is variable cam timing



Before we look at VVT-i, let's talk about sensors. VVT systems use all sorts of sensors, but the most important are the camshaft and crankshaft position sensors (which are often hall effect sensors). The ECU uses these sensors to monitor the relationship between the piston?s location and the valves' positions. The crankshaft is connected to the rod and piston, and the camshaft's lobes trigger valve lift events. Thus, with the information from the crankshaft and camshaft position sensors, the ECU can learn how fast the engine is rotating and the relative positions of the piston and the intake and exhaust valves.
Cam Phasing


http://jalopnik.com/how-variable-val...orks-500056093

 

[Maclin]

Bondo and others, VP has a new 5.3 out there, description from a certain website is below. Would try to publish a link to it but want to stay out of trouble.

Volvo Penta V8-300 main video
The next generation of Volvo Penta?s small block V8 sterndrive engines has recently been introduced to the boating public. These highly advanced 5.3 L (323. cu. in) powerplants are available in 300 and 350 horsepower catalyzed versions and provide super clean emission standards.

 

[Maclin]

Interesting to me that the DuoProp version final drive ratio is 2.32, whereas the current 5.7 is mated to a 1.95, indicating slightly less torque available on the new higher revving 5.3.

 

[K-2]

I do not find the 5.3 or 6.0 offered as inboards on the VP website.
Is Volvo going to sell inboards? Or just engine/drive packages?
I haven't seen any fuel numbers for the 5.3, the 6.0 is close to the 5.7 in fuel use .

 

[bruceb58]

It is based on the truck 5.3L but with the all aluminum block. The 5.3L in the truck developed its torque at a higher RPM than with the 350. I wonder if they changed that with the VVT.

 

[Maclin]

K-2, the 5.3 package is I/O, offered to new boat builders as a more efficient package for meeting any new standards that may be mandated for emissions and economy than the previous generation. It has all of the maintenance type items up front and supposedly more physically accessible. A certain web site well known for boat testing and engine testing "announced" it to their subscribers as they do with any and all new engine combos. The site tested a boat with that specific combo installed and published their results. I think the powerband from that engine needs some help with the gearing choices indexed on boat size and weight to realize all the potential.

 

[funk6294]

GM has also added the LS series to their marine offerings. Check out the power train page.

http://www.gmpowertrain.com/MarineEnginesControllers/ProductPortfolio.aspx

 

[bruceb58]

GM has also added the LS series to their marine offerings.

That's who Volvo is buying the engine we are talking about here.

 

[Maclin]

Volvo still offers reman 5.7 packages for "legacy" repowering. So far their 5.3 is for new installs, has several advantages that boat designers could take advantage of, for both the maintainers (Us!) and the MFG. More logical design from Volvo of maintenance components all on the front of the engine, and overall footprint "gains" in useable area around it with overall weight reduction even with emissions components with nearly same power..

 

[jimmbo]

The higher RPM range of the new engine is going to be a problem, and as mentioned earlier, will require a gear ratio change, or a very large reduction in propeller pitch

 

[K-2]

I'm sure the price of a 5.3 will put an end to this idea.

 

[bruceb58]

I'm sure the price of a 5.3 will put an end to this idea.

Agreed, along with the price of a gear change, it would be way more expensive than getting a 5.7L replacement long block.

 

[jimmbo]

I'm sure the price of a 5.3 will put an end to this idea.

My heart stopped, I think it will start up again

 

[K-2]

I know I'm comparing apples to oranges but I priced a gas Volvo Penta 6.0 , 380 HP with the ocean outdrive and the price was $29K and change , the D4 diesel is $31K with outdrive. Seems like crazy prices for gas engines to me .