Prop Ideas
03-30-2020, 12:25 AM
#1
Platinum Member
Platinum MemberThread Starter
Prop Ideas
I just did fresh builds on a Saber 28. Running standard length Bravo Drives with 1.5 XR Gears. Boat has twins. Old build were 465 HP each on the dyno running 88 GPS with 30 Bravo One's 5400 RPM I bought it with them so I don't know if they were ever worked.
Everything else is the same with drives, etc. new motors are 640 HP each at 5300. Probably stay with Bravo 4 blade props I am also running Drive Guardians this year. Thoughts of where to start?
Everything else is the same with drives, etc. new motors are 640 HP each at 5300. Probably stay with Bravo 4 blade props I am also running Drive Guardians this year. Thoughts of where to start?
Last edited by RBeyer; 03-30-2020 at 12:26 AM. Reason: typo
03-30-2020, 11:16 AM
#2
Originally Posted by RBeyer
I just did fresh builds on a Saber 28. Running standard length Bravo Drives with 1.5 XR Gears. Boat has twins. Old build were 465 HP each on the dyno running 88 GPS with 30 Bravo One's 5400 RPM I bought it with them so I don't know if they were ever worked.
Everything else is the same with drives, etc. new motors are 640 HP each at 5300. Probably stay with Bravo 4 blade props I am also running Drive Guardians this year. Thoughts of where to start?
Everything else is the same with drives, etc. new motors are 640 HP each at 5300. Probably stay with Bravo 4 blade props I am also running Drive Guardians this year. Thoughts of where to start?
03-30-2020, 09:52 PM
#3
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Originally Posted by Trash
I would start where you left off. Get solid data with your old/existing props and the new motors. Yes I understand you 'may' be underpropped considering the HP upgrade, but at least you have a base line. Once that is done you will have a more refined starting point on which direction to go.
03-30-2020, 10:33 PM
#4
I'm curious did you increase the size of your engines, or add blowers? An extra 200 hp is a big gain. Whenever I increase power but kept the engines the same size, I used the same props. I always hoped to spin a larger prop, but that was never the case. Again, with me, I was making more with the same size engine, which needed to be spun harder to make the increase in power. If you added a blower to your engines, that is something I have no experience with.
Please let us know what you did. I think that would help in the prop recommendation.
Please let us know what you did. I think that would help in the prop recommendation.
03-31-2020, 12:00 AM
#5
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Platinum MemberThread Starter
Originally Posted by endeavour32
I'm curious did you increase the size of your engines, or add blowers? An extra 200 hp is a big gain. Whenever I increase power but kept the engines the same size, I used the same props. I always hoped to spin a larger prop, but that was never the case. Again, with me, I was making more with the same size engine, which needed to be spun harder to make the increase in power. If you added a blower to your engines, that is something I have no experience with.
Please let us know what you did. I think that would help in the prop recommendation.
Please let us know what you did. I think that would help in the prop recommendation.
The builds were done by Tyler Crockett, they pulled 640 HP at 5300 RPM on 89 octane.
The original builds pulled 465 HP on the dyno built by More Power I bought the boat with those motors.
03-31-2020, 02:21 AM
#6
Charter Member # 55
Charter Member
Working numbers, 200 hp would probably translate into a 1000 rpm gain if you kept the same props.
I would probably try some some 36 Bravos. You may want to consider a gear change to 1.35's for more prop options.
I would probably try some some 36 Bravos. You may want to consider a gear change to 1.35's for more prop options.
03-31-2020, 10:12 AM
#7
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Platinum MemberThread Starter
Originally Posted by Griff
Working numbers, 200 hp would probably translate into a 1000 rpm gain if you kept the same props.
I would probably try some some 36 Bravos. You may want to consider a gear change to 1.35's for more prop options.
I would probably try some some 36 Bravos. You may want to consider a gear change to 1.35's for more prop options.
03-31-2020, 10:13 AM
#8
Were the engines both Dyno'd at Tyler Crocketts shop? I know that Dicks dyno numbers are very conservative, so unless the engines were both dyne'd at the same place, I wouldn't put much stock in the hp comparison. . Getrdunn is very familiar with More Power, shoot him a PM, he will confirm the their numbers are always WAY low. A 525SC certainly makes more than 465 hp stock, what exactly did Tyler do? Was it just a head swap and an increase in PSI? Also was Dicks number using all accessories and stock exhaust? Something really seems off on the comparison of the two engines.
03-31-2020, 10:25 AM
#9
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Originally Posted by endeavour32
Were the engines both Dyno'd at Tyler Crocketts shop? I know that Dicks dyno numbers are very conservative, so unless the engines were both dyne'd at the same place, I wouldn't put much stock in the hp comparison. . Getrdunn is very familiar with More Power, shoot him a PM, he will confirm the their numbers are always WAY low. A 525SC certainly makes more than 465 hp stock, what exactly did Tyler do? Was it just a head swap and an increase in PSI? Also was Dicks number using all accessories and stock exhaust? Something really seems off on the comparison of the two engines.
03-31-2020, 10:47 AM
#10
The best thing to do, is just buy some different props and see where it puts you. Every Inch of pitch will reduce your RPMs 200. If you gain 1000 RPMs as Griff said, there isn't a Bravo prop steep enough, so you may need to re-gear your drive. However, I would test out some steeper props first. Have you called Airmarine in Chicago, to see if they have set of 34-36 B1s you can try? Their test program is way cheaper than BBlades, and you don't have to ship anything. However with the lockdown, they may not be open.
