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Volvo Penta DPX Q&A

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Volvo Penta DPX Q&A

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Old 01-27-2019, 11:33 PM
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Hey all - looking for some info about Volvo Penta DPX duodrive performance. I have a 27 Eliminator with a stock (non-EFI) 502 and E3 props on my DPX. Running 66MPH @ 4k RPM. What do you have with yours and what are you getting as far as performance? Thanks!
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Old 01-28-2019, 06:50 AM
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I ran the same speed in my v-bottom 21' boat @ 4500 rpm, 1.68:1 and E2s.
Small block with 400 hp.

The outdrive is moving to my new (old) 28' boat but the engine will be replaced by a bigger one.
No idea on what speed to expect from the new boat, might hit the water this summer if all goes well - its to early in the project to know yet.
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Old 01-28-2019, 09:47 AM
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I think Volvo sold the DPX drive with a 600HP engine at one point. Has anyone exceeding that power level with the drive that you know of?
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Old 01-28-2019, 10:20 AM
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There is an Arrow 830 over here that had about 700 hp with an dpx outdrive, I believe that they broke the outdrive once when landing at full throttle doing about 70 knots.
You are correct in that Volvo sold the dpx drive with a 540 cui motor, 560 hp at the prop shaft.
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Old 01-29-2019, 07:20 AM
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Which DPX do you have, earlier R or later A? The As are a little stronger as they eliminated a mid housing, going to (2) pieces from (3). On the Rs, the upper/mid was a weak link. On all of them, the pinion gear is prone to failing once you get past a couple hundred hours. The other thing that was a MAJOR killer of them, was being used in high x dimension/surfacing applications. Last thing, is keep an eye on your props, as the rears especially, had a tendency to develop stress cracks in the blades.

I had the DPX 600 setup for 11 years, and as far as driveability/reliability, I would take them over a Bravo anyday
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Old 01-29-2019, 10:05 AM
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That is some great info - thank you for sharing. Not sure which I have as far as R or A, I have put a couple pics here - its on a 1998 model. The x dimension I am also not familiar with, but here is also a pic of the boat. Its a air entrapment hull (cat) - Thanks again for all the info! Love to learn.
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Old 01-29-2019, 10:08 AM
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no pics for now apparently

You are not allowed to post URLs until you have at least 10 posts
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Old 01-29-2019, 01:13 PM
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The Rs have a (3) pc housing and are kind of ugly/angular on the upper. If the drive is original to the boat, based on year I would guess you have an R. The As are a little prettier, have a (2) pc housing which is sloped/rounded on the upper.
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Old 01-29-2019, 01:43 PM
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got it. based on that description I have the ugly older one when I bought the boat the lower had broke instantly. sourced a new old stock lower from doug rusell and it was a different gear (1.58) versus the one I had. Luckily they mated ok and the service center said no problem, just not sure how affects gearing.
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Old 01-29-2019, 01:45 PM
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There are DPX-S (and S1), followed by DPX-R and then later on DPX-A.
I have a picture of the differences of the drives but I'm not allowed to post any pictures yet.
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