210 with Volvo DP 300 or 320 hp

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210 with Volvo DP 300 or 320 hp

Post by cobalter » Tue May 26, 2015 2:29 pm

Anyone here have opinions on this boat and motor combo? Seems the smaller engine choices might be a little thin with this size boat or at altitude such as 3600 feet at Lake Powell, UT. Our last cobalt was a 2003 226 with Volvo 300 hp and it was two feet longer and perhaps a little heavier. It ran in upper 50s as I recall but only on speedo not GPS. The newer boats have a slightly different hull design so not sure how that affects top speed but suppose to be smoother and flatter cornering.

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Re: 210 with Volvo DP 300 or 320 hp

Post by jhnmdahl » Tue May 26, 2015 3:11 pm

I have a new 210 with the same 5.7L V8 engine, but tuned to run 225hp instead of 300 or 320hp. The only difference between the 225 and 300 is the throttle body and ECU, while the 320 has several parts changed to get the extra horsepower. Top speed is a little under 50MPH, but only 3.5 seconds to get on plane with the dual prop configuration.

Volvo has stated that torque is the same for the 225 and 300 through most of the power band, but the 300 has a higher top rpm, and therefore mph. I've seen tests that show the 210 topping 55mph with the Mercury 320hp, so I'd guess the Volvo 320hp will be similar (i.e. don't expect 60mph), and the 300 should be maybe 53-54mph?

I'm much more interested in being able to pull a skier and reliability than in another 8mph top end speed, so the 225 was a perfect fit for me. It's a fair bit cheaper than the 300 or 320, and Volvo actively promotes it as a good choice for high altitude boaters.

John
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Re: 210 with Volvo DP 300 or 320 hp

Post by cobalter » Tue May 26, 2015 3:31 pm

Thanks for helpful reply. In my case it is usually just two people cruising on bigger lakes where a high cruise speed in helpful esp. when running the 100 plus mile length of Lake Powell, UT or similar lakes like Table Rock or Grand of the Cherokees early in the morning. The difference between 800 ft. altitude vs. 3600 at Powell would also make a difference as I think you lose about 3% of HP per 1000 feet altitude. We don't do water sports (only two of us) so no need for the hole shots particularly and therefor my interest in top speed; not that I would be running 5000 or 5200 rpm for long but 60 mph potential is just my own benchmark when looking at boat and motor combos. Would it be worthwhile to re-prop a Volvo DP for this purpose vs the standard that is probably more efficient for water sports?

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Re: 210 with Volvo DP 300 or 320 hp

Post by jhnmdahl » Tue May 26, 2015 3:59 pm

Volvo recommends changing gear ratios in the outdrive if much higher than 3500 feet, but a propeller change would accomplish about the same thing with less cost. It's also easy to switch back and forth with a $20 tool if you boat at different altitudes.

The real issue with altitude is that the boat will get a little less air at a given throttle position than it is calibrated to take in. If carburated, the boat may run a little rich so you'll only have enough air to burn some percentage of the fuel being used, and fuel efficiency will suffer. EFI on newer engines like the Volvo 5.7 compensates for this better than engines of 10 years ago.

As for derating for altitude, I know the 225 is still rated for 225hp at 3500 feet, but the 300 and 320 have already started to drop in horsepower. Your 3% rule of thumb is familiar, but engines start dropping horsepower at different altitudes so you don't always start counting from 0 feet (e.g., the V8-225 is still 225hp at 3500 feet, but is probably down 3% by 4500 feet).

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Re: 210 with Volvo DP 300 or 320 hp

Post by cobalter » Wed May 27, 2015 8:29 pm

Ok, thanks. If the usual altitude for the operation is around 1,000 ft. would a change of props be worthwhile to increase top speed and cruising speed? The 3600 ft. operation would only be about once a year. I know what a single prop costs but hate to think what two would cost for this DP. In any case you have provided some insightful info on the matter. I have ordered the 210 with the Volvo DP 5.7 GXi 320 hp. I think this will be a good combination and look forward to any additional opinions.

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Re: 210 with Volvo DP 300 or 320 hp

Post by jhnmdahl » Wed May 27, 2015 10:27 pm

That's a lot of engine for the boat, and I'd think you'll be just fine. If not, you're looking at maybe $1200 to find a discounted set of propellers, and about $1400 list. Ask me how I know. (Dinged a propeller on a rock a couple weeks ago, and am now motivated not to let that happen again).
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Re: 210 with Volvo DP 300 or 320 hp

Post by cobalter » Thu May 28, 2015 7:41 am

Ouch, it does make one even more paranoid about submerged objects. Are these props the same, just left and right handed?

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Re: 210 with Volvo DP 300 or 320 hp

Post by jhnmdahl » Thu May 28, 2015 9:11 am

No, they are a little different in addition to their different orientations. a few local shops specialize in repair - looks like they should be back to new for under $250, but still... time to start watching where I'm going.
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Re: 210 with Volvo DP 300 or 320 hp

Post by cobalter » Thu May 28, 2015 2:28 pm

My dealer called to finalize my 210 order with a completion date of end of June. Does anyone know how long it takes to complete a 210 for shipping from the date it goes into production?

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Re: 210 with Volvo DP 300 or 320 hp

Post by jhnmdahl » Fri May 29, 2015 10:24 am

That depends a lot on when you order it. I ordered mine the last day of 2014, and it arrived at the dealer in early April, but an order in early summer may mean you're four+ months away from seeing the boat. Your delaer should be able to get an estimate for you.
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