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Author Topic:   MONTAUK with E-TEC 90

cinegamma posted 06-13-2010 11:00 PM ET (US)
I just had my [1984] Montauk re-powered with an E-TEC 90-HP and a SOLAS 13 x 19 propeller. At wide-open throttle the engine speed is only 4,500-RPM. Does that sound about right? In the reference section [an article on E-TEC recommended speed ranges gives] the optimal RPM range as 5,000 to 5,200. What would you suggest if I want to turn it closer to that range?
Jon
seahorse posted 06-13-2010 11:37 PM ET (US)
Chances are that you will need a 15-nch-pitch propele to get the correct RPM and performance
Jeff posted 06-13-2010 11:54 PM ET (US)
First some information would be helpful..
Is your current prop stainless or Aluminum?
What hole is it mounted at?
What are your speeds at:
2000rpm =
2500rpm =
3000rpm =
3500rpm =
4000rpm =
4500rpm =
If your motor is mounted where it needs to be, as well as your test prop is aluminum, I may start testing with a OMC/BRP SST 13 3/8" x 17 stainless prop.
Your BPR dealer who sold you the E-Tec should have a large selection of stainless test propellers for you to test run on your Montauk. This will help you find the right propeller for your needs. Honestly, I have to say shame on them for sending you off without running multiple props to find the right one for you right out of the gate.
Tom W Clark posted 06-14-2010 12:15 AM ET (US)
Whoever put a 13" x 19" Solas prop on your new motor didn't know what they were doing.
You need either a 17" BRP SST/SSP/Viper or a 15" Stiletto Advantage.
The latter will cost less and perform better than the former.
Be sure the motor is mounted at least one hole up on the transom, two holes up if the Stiletto is used.
Buckda posted 06-14-2010 08:57 AM ET (US)
Additionally, if your dealer is not red-faced apologetic about this, then I'd find another dealer, and strongly consider writing to BRP to complain about the service you received and apparent lack of training/understanding about BRP motors and appropriate setup.
It is important for the dealer network to be comprised of strong, knowledgeable dealers.
Conversely, for others reading this, if you have an excellent dealership experience, consider also writing BRP to mention that as well.
cinegamma posted 06-14-2010 12:45 PM ET (US)
The SOLAS 13 x 19 that's on now is aluminum. According to my hand-held GPS, at 4500 rpm it will goes back and forth between 39 and 40 mph. Thanks to all for the replies.
Jon
cinegamma posted 06-14-2010 12:49 PM ET (US)
One more thing, it's mounted in the 2nd hole from the bottom of the 4 mount holes.
Tom W Clark posted 06-14-2010 12:51 PM ET (US)
So its three holes up now; that's good.
Go with the 13-1/4" x 15" Stiletto Advantage 4.25. Top speed should increase quite a bit as will the acceleration.
ratherwhalering posted 06-18-2010 11:51 AM ET (US)
Agreed. The Stiletto Advantage I 13.25 x 15 is good selection for your Montauk. I'm going to disagree with Tom (gasp!) though. The 17" BRP SST/SSP/Viper may be a better propeller for your application. The Stiletto is best suited for engines that are mounted high, high, high on the transom. BRP SST/SSP/Viper is more forgiving, and feels "softer" at low and mid range. The only analogy I can come uop with is the difference between a stick shift (Stiletto) and an Automatic (SST/SSP/Viper) automobile transmission.
--Rob--
'87 Montauk w/2004 E-TEC90, Stiletto 13.25 x 15.
cinegamma posted 07-02-2010 11:20 AM ET (US)
Update. I now have a 17" SST prop on the E-TEC. A late afternoon test turned up these results:
Wide open throttle varied between 4,900 and 5,000 RPM and top speed was 42 mph (gps).
4,000 RPM was around 35 mph (gps).
According to the user manual, optimal wide open throttle RPM should be between 4,500 and 5,500 RPM. So I guess I'm on target at 5,000.
I plan to get more speed and RPM measurements over the holiday weekend; that is assuming I can find an open stretch of water free of pontoon boats, waverunners, etc.
Jon
Tom W Clark posted 07-04-2010 11:33 AM ET (US)

quote:
According to the user manual, optimal wide open throttle RPM should be between 4,500 and 5,500 RPM. So I guess I'm on target at 5,000.
That's not quite right. The Recommended WOT range is 4500-5500 but the Optimum RPM range is 5000-5200 RPM.
If you are hitting 5000 RPM you are there.
cinegamma posted 07-06-2010 10:55 PM ET (US)
Here are the numbers from today's test:
2,500-RPM, 19-MPH
3,000-RPM, 24-MPH
3,500-RPM, 30-MPH
4,000-RPM, 34-MPH
4,500-RPM, 37-MPH
5,000-RPM, 42-MPH (wide open throttle)
17" SST propeller, mounted in 2nd hole from bottom, all speeds GPS.
L H G posted 07-08-2010 07:39 PM ET (US)
With the 2.0 gearing, I would think you'd have to turn 5500 to get that 42 MPH speed with a 17" prop.

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Author	Topic: MONTAUK with E-TEC 90
cinegamma	posted 06-13-2010 11:00 PM ET (US) I just had my [1984] Montauk re-powered with an E-TEC 90-HP and a SOLAS 13 x 19 propeller. At wide-open throttle the engine speed is only 4,500-RPM. Does that sound about right? In the reference section [an article on E-TEC recommended speed ranges gives] the optimal RPM range as 5,000 to 5,200. What would you suggest if I want to turn it closer to that range? Jon
seahorse	posted 06-13-2010 11:37 PM ET (US) Chances are that you will need a 15-nch-pitch propele to get the correct RPM and performance
Jeff	posted 06-13-2010 11:54 PM ET (US) First some information would be helpful.. Is your current prop stainless or Aluminum? What hole is it mounted at? What are your speeds at: 2000rpm = 2500rpm = 3000rpm = 3500rpm = 4000rpm = 4500rpm = If your motor is mounted where it needs to be, as well as your test prop is aluminum, I may start testing with a OMC/BRP SST 13 3/8" x 17 stainless prop. Your BPR dealer who sold you the E-Tec should have a large selection of stainless test propellers for you to test run on your Montauk. This will help you find the right propeller for your needs. Honestly, I have to say shame on them for sending you off without running multiple props to find the right one for you right out of the gate.
Tom W Clark	posted 06-14-2010 12:15 AM ET (US) Whoever put a 13" x 19" Solas prop on your new motor didn't know what they were doing. You need either a 17" BRP SST/SSP/Viper or a 15" Stiletto Advantage. The latter will cost less and perform better than the former. Be sure the motor is mounted at least one hole up on the transom, two holes up if the Stiletto is used.
Buckda	posted 06-14-2010 08:57 AM ET (US) Additionally, if your dealer is not red-faced apologetic about this, then I'd find another dealer, and strongly consider writing to BRP to complain about the service you received and apparent lack of training/understanding about BRP motors and appropriate setup. It is important for the dealer network to be comprised of strong, knowledgeable dealers. Conversely, for others reading this, if you have an excellent dealership experience, consider also writing BRP to mention that as well.
cinegamma	posted 06-14-2010 12:45 PM ET (US) The SOLAS 13 x 19 that's on now is aluminum. According to my hand-held GPS, at 4500 rpm it will goes back and forth between 39 and 40 mph. Thanks to all for the replies. Jon
cinegamma	posted 06-14-2010 12:49 PM ET (US) One more thing, it's mounted in the 2nd hole from the bottom of the 4 mount holes.
Tom W Clark	posted 06-14-2010 12:51 PM ET (US) So its three holes up now; that's good. Go with the 13-1/4" x 15" Stiletto Advantage 4.25. Top speed should increase quite a bit as will the acceleration.
ratherwhalering	posted 06-18-2010 11:51 AM ET (US) Agreed. The Stiletto Advantage I 13.25 x 15 is good selection for your Montauk. I'm going to disagree with Tom (gasp!) though. The 17" BRP SST/SSP/Viper may be a better propeller for your application. The Stiletto is best suited for engines that are mounted high, high, high on the transom. BRP SST/SSP/Viper is more forgiving, and feels "softer" at low and mid range. The only analogy I can come uop with is the difference between a stick shift (Stiletto) and an Automatic (SST/SSP/Viper) automobile transmission. --Rob-- '87 Montauk w/2004 E-TEC90, Stiletto 13.25 x 15.
cinegamma	posted 07-02-2010 11:20 AM ET (US) Update. I now have a 17" SST prop on the E-TEC. A late afternoon test turned up these results: Wide open throttle varied between 4,900 and 5,000 RPM and top speed was 42 mph (gps). 4,000 RPM was around 35 mph (gps). According to the user manual, optimal wide open throttle RPM should be between 4,500 and 5,500 RPM. So I guess I'm on target at 5,000. I plan to get more speed and RPM measurements over the holiday weekend; that is assuming I can find an open stretch of water free of pontoon boats, waverunners, etc. Jon
Tom W Clark	posted 07-04-2010 11:33 AM ET (US) quote: According to the user manual, optimal wide open throttle RPM should be between 4,500 and 5,500 RPM. So I guess I'm on target at 5,000. That's not quite right. The Recommended WOT range is 4500-5500 but the Optimum RPM range is 5000-5200 RPM. If you are hitting 5000 RPM you are there.
cinegamma	posted 07-06-2010 10:55 PM ET (US) Here are the numbers from today's test: 2,500-RPM, 19-MPH 3,000-RPM, 24-MPH 3,500-RPM, 30-MPH 4,000-RPM, 34-MPH 4,500-RPM, 37-MPH 5,000-RPM, 42-MPH (wide open throttle) 17" SST propeller, mounted in 2nd hole from bottom, all speeds GPS.
L H G	posted 07-08-2010 07:39 PM ET (US) With the 2.0 gearing, I would think you'd have to turn 5500 to get that 42 MPH speed with a 17" prop.