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6.2 DI \ Scott 912 Testing Successful

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6.2 DI \ Scott 912 Testing Successful

Postby Scottwaterjet » Wed Dec 12, 2018 10:17 pm

Customer demand has accelerated our efforts to have the 912 available to match up with the GM 6.2DI and Raptor 440/460’s.

We have been very busy supplying the 912 for river boats with GM LSA’s, Raptor 575’s, and custom engine builds. The results have been fantastic for both retrofit and new build customers.

Both the GM 6.2 DI and Indmar Raptor 440/460's engines have been on our radar for some time as they have an aggressive torque curve that is ideally matched to our 912 pump. The 912 is able to maximise the engines power delivery without the compromise of slip/cavitation whilst offering exceptional drivability providing great engine/jet combinations for jet boaters.

We are pleased to announce that the order for our first install of a 912 utilising a 6.2DI engine was placed in the last few days. This installation is for a retrofit so we are hopeful that we will be able to gather some before and after data to share with you all.

It’s fair to say that we are very excited by this next phase of 912 development. We look forward to making the benefits of the 912 Two-stage with Trim available to a wider number of jet boaters: more grip, more push, more lifting power, better load carrying, better-cruising speed, and ability to utilise the available capabilities of your engine.
Attachments
912 Production.jpg
440-top.jpg
6.2_DI Image Marine Power.jpg
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Smoke » Thu Dec 13, 2018 12:25 pm

What pump and motor combo is getting replaced? Or is the retrofit just replacing the pump?
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Scottwaterjet » Thu Dec 13, 2018 1:08 pm

Smoke wrote:What pump and motor combo is getting replaced? Or is the retrofit just replacing the pump?


Just the pump is being replaced. The 912 is replacing an HJ213.
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Scottwaterjet » Tue Feb 05, 2019 8:11 pm

A quick update
Some testing of a 6.2DI and HJ213 combination was completed today. The HJ213 will now be retrofitted with the 912.
When we have some test results of the 6.2DI \ 912 combination we will let you know. We are looking forward to the relative test results.
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Benny » Tue Feb 05, 2019 9:05 pm

Since the 213 can handle the 6.2di just fine is it safe to say we will not see the benefit as much as with the lsa? Maybe the only real difference will be the trim and adjustable nozzle?
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Scottwaterjet » Tue Feb 05, 2019 10:19 pm

Benny wrote:Since the 213 can handle the 6.2di just fine is it safe to say we will not see the benefit as much as with the lsa? Maybe the only real difference will be the trim and adjustable nozzle?

.
Hi Benny,
We are expecting more. We are expecting: Better grip, white-water performance, push, load lifting, load carrying, and cruising speed.
.
How: Two-stage pump (greater blade area, two-stage white water performance), trim (effectively able to actively adjust your boat trim for best holeshot, cruise etc) and designed to better utilise the high torque modern V8 engines.
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Benny » Wed Feb 06, 2019 6:31 am

I look forward to reading your comparison.
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby viking » Wed Feb 06, 2019 11:46 am

Please expand on the term "high torque" and its role in jet boat operation. As a discussion aid, please consider comparison with a less modern engine such as the 8.1 HO.
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Re: Demand : 912 readied for the GM 6.2 DI & Raptor 440/460'

Postby Scottwaterjet » Wed Feb 06, 2019 2:40 pm

Hi Viking, Would you have a torque curve for the 8.1 HO?
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby viking » Wed Feb 06, 2019 5:10 pm

My browser chops off the bottom of this figure unless I click on it. I tried replacing it with a jpeg, but to no avail.

81Torque420.png
81Torque420.png (96.28 KiB) Viewed 1013 times

..
Last edited by viking on Wed Feb 06, 2019 8:30 pm, edited 4 times in total.
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby akhunter67 » Wed Feb 06, 2019 6:55 pm

Not much of a curve! That graph is saying an 8.1 ho makes over 800 ft lbs of torque! Am I reading that rt?
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby Riverjohn » Wed Feb 06, 2019 7:00 pm

akhunter67 wrote:Not much of a curve! That graph is saying an 8.1 ho makes over 800 ft lbs of torque! Am I reading that rt?
No
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby waylon » Wed Feb 06, 2019 8:07 pm

if a 8.1 made 800 # tq it would still reign supreme.
"Only God knows why" Image
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby viking » Wed Feb 06, 2019 8:19 pm

My browser is chopping off the bottom of the figure unless I click on it.

Torque is the flatter line referenced to the axis on the right.
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Re: Scott 912 readied for the GM 6.2 DI & Raptor 440/460's

Postby akhunter67 » Wed Feb 06, 2019 8:30 pm

Thanks ! I got it now !
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6.2 DI \ Scott 912 Testing Successful

Postby Scottwaterjet » Thu Apr 04, 2019 4:47 pm

Jeff from Schlagel Marine & Motorsports and Chuck Campbell from CJC Marine have recently completed some relative testing in a boat that originally had the KEM 6.2 Di \ HJ213 combination installed, and then the HJ213 was replaced with a Scott 912. The testing was like for like and there were no changes to the boat other than the jet being replaced.

The owner of this boat approached us asking if the 912 would improve the performance of his boat as he was disappointed with how it was currently performing. Without hesitation the answer was yes. The 912 was purchased and retrofitted by Chuck at CJC Marine. Test results pre and post the retrofit are provided below. Testing was done in the Boise area at around ~ 2700 ft.

KEM 6.2 DI \ HJ213 \ 4T [Wind 5 mph up river 39Deg F] [3 People + 50 gallons Fuel]
rpm Up Down (mph)
3000 22 28
3500 27 32
4000 38 40

General comment about performance:
Cavitation on take-off. Required a very light touch on the throttle to prevent cavitation. Slow to get on to the plane. Slow to rev. Not much fun to drive. Sluggish. Easily break loose in a tight turn. The team was very unimpressed with performance in all respects.

KEM 6.2 DI \ 912 (19\19p 126 mm Nozzle) [Wind 15mph down river 62Deg F [Equivalent load as above]
rpm Up Down (mph)
3000 19 30
3500 28 36
4000 38 45

General comment about performance:
The test team were very impressed with the transformation. They were impressed with how it drove, turned, handled, with the hole shot, no cavitation, and the response thru the full rev range.

Key points:
1. The 912 has a wider operating tolerance than the 212\213 demonstrated by the improved performance from the 6.2 DI \ 912 combination.
2. The 912 provided better boat performance, handling and control. How?
a. Trim Nozzle.
b. Increased steering leverage.
c. Grip provided by the two-stage configuration.
d. Higher entrained weight of water in the jet.
e. High resistance to cavitation and spin-out due to the superior grip of the two-stage configuration, more entrained water in the jet, and greater impeller blade area.

Although load lifting was not tested it is fair to assume, based on our comparative load testing of the LSA\212 and LSA\912 combination, that with the same 6.2 DI engine the 912 will out perform the 213. This is due to the 912 having a greater volume\mass of water exciting the nozzle, greater grip from the two-stage configuration, trim nozzle to improve the lifting moment of the jet stream, and greater impeller blade area.

Some comments from Chuck Campbell of CJC Marine:
“The Scott 912 is amazing! We have a very happy customer who got a brand new boat that required a real light touch on the throttle to prevent cavitation and it would easily break loose in a tight turn. There was absolutely nothing wrong with the motor or pump but the combo just didn’t work with the hull design. He now has a boat that you can stab full throttle and won’t break loose, no matter how hard I tried :) .”

“Again, there was nothing wrong with the other pump (it’s for sale if anyone is interested) it just did not work with this particular hull design and the Scott does”

“This was a much easier retrofit than I expected.”

“We proved the Scott pump works with both supercharged and non-supercharged motors!”
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Re: 6.2 DI \ Scott 912 Testing Successful

Postby intruder » Thu Apr 04, 2019 5:36 pm

Sounds like that 912 has some awesome grip based on the difference reported by Scott Jet.

Would be cool to see @Viking with one of these 912's on his 6.2 DI having another go at the "No Name" rapid. That would give us something to compare !! Big water requires big Kahunas! @Viking must be slightly bow-legged.
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