Like Tree1Likes
  • 1 Post By toooomanyboats

swapping power 390s

Old 07-02-2019, 06:09 PM
  #1  
Registered
Thread Starter
 
Join Date: Jun 2019
Location: Fort Myers FL
Posts: 12
Default swapping power 390s

Moving 625 ILMORs from a Velocity 390 that was a staggered set, transmissions with Konrad drives, to another Velocity 390 that is a side by side motor set up running XR drives. The ILMORs in the staggered boat ran around 83 mph ,having transmissions not only took power away it moved the motors to far forward in the boat ,making the boat run very flat. The new set up we are hoping to run low 90s, boat should be better balanced and able to get up on the pad bottom. Does anyone have any thoughts on our projected speed of low 90s for the new set up.
toooomanyboats is offline  
Old 07-02-2019, 06:43 PM
  #2  
Platinum Member
Platinum Member
iTrader: (6)
 
F-2 Speedy's Avatar
 
Join Date: May 2012
Location: Midwest & T-Rock
Posts: 6,690
Default

Are there Konrads for sale in all this swapping around ?
F-2 Speedy is online now  
Old 07-09-2019, 03:11 PM
  #3  
Registered
 
Trippin's Avatar
 
Join Date: Dec 2003
Location: Lexington, KY
Posts: 490
Default Ilmor on bravos

Originally Posted by toooomanyboats View Post
Moving 625 ILMORs from a Velocity 390 that was a staggered set, transmissions with Konrad drives, to another Velocity 390 that is a side by side motor set up running XR drives. The ILMORs in the staggered boat ran around 83 mph ,having transmissions not only took power away it moved the motors to far forward in the boat ,making the boat run very flat. The new set up we are hoping to run low 90s, boat should be better balanced and able to get up on the pad bottom. Does anyone have any thoughts on our projected speed of low 90s for the new set up.
Go search out "Marginmn" he had a Fountain that we swapped the 625's to 710's' not staggered, he'll have a good idea of what you might expect. In fact you'll find someone has already asked him that question when you search by his user name.

Last edited by Trippin; 07-09-2019 at 03:14 PM.
Trippin is offline  
Old 08-06-2019, 01:52 PM
  #4  
Registered
iTrader: (1)
 
Join Date: Dec 2001
Location: Indianapolis, Lake Cumberland
Posts: 3,657
Default

Hey Trippin, how you been?

Yea I had a 2000 small-stepped 38 Fever with Imco extension boxes and -2 Imco shorties that I first put a set of Merc 525's in. Ran 85 out of the box with the 525's and I think a set of stock 32 Bravos. Probably could have squeezed a few more MPH with modified props. Swapped to a set of first generation Ilmor 625's and best I saw out of it was 89ish with Hydro PX5's. . Swapped to a set of Ilmor 710's and the best I saw was around 95 with PX5's. Sold the Fountain and put the 710's in a Donzi ZRC staggered and have run a best of 105 on the Palmaco river testing out of the Fountain factory with a set of 34 Herring Cleavers currently on the boat.
Marginmn is offline  
Old 08-07-2019, 04:38 PM
  #5  
Registered
Thread Starter
 
Join Date: Jun 2019
Location: Fort Myers FL
Posts: 12
Default

Thanks Marginmn ,

Good info ,a 39 Velocity would run about the same speeds with 525's 84-85 MPH . So maybe closer to 89-90 MPH . We should know in a few more weeks it should be ready for water test.
Marginmn likes this.
toooomanyboats is offline  
Old 12-27-2019, 07:00 AM
  #6  
Registered
Thread Starter
 
Join Date: Jun 2019
Location: Fort Myers FL
Posts: 12
Default

Well we have had the boat in the water a few times. We tested with standard XRs run around 83-84 MPH, 29 5 blade hydros. Then tried -2'' lowers same props boat rum 90-91 MPH was very light on fuel . Love how the boat feels with the ITS , I only had some short test time with the - 2" lowers, have them on know hoping to run this weekend running a new pair of 32 5 blade Maximus props. The most RPMs I could get was 5600, I think they red line at 6000 is there more to get ?
toooomanyboats is offline  

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


OSO Sponsor
OSO Advertiser
OSO Advertiser

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information

Copyright 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.

OSO Advertiser