Go Back   TeamTalk > Maintenance Tips, How-tos and Refurbishing Topics > Engine / Drive Train

Reply
 
Thread Tools Display Modes
  #1  
Old 02-02-2013, 10:37 AM
Kweisner's Avatar
Kweisner Kweisner is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: 2007 Prostar 197
Location: Southeast
Posts: 400
Engine RPMs at WOT on 2007 197TT

My 2007 197TT has the MCX w/Powerslot tranny, and a OJ 13.5 x 15 prop with a .80 cup. When I run at WOT, the engine is turning approximately 4500-4600 RPM.

In reading the manual, the specs for the 197 indicate Max allowable rpm at WOT of 4800 to 5200. But the spec also calls for a 12.5 x 12 prop when the same engine/trans are mated.

On the other hand, I have heard that one of the "mods" for the TT Edition is the 13.7 x 15 prop. My question is two-fold:
  1. Can anyone verify that the TT should be using the prop I currently have mounted?
  2. If so, would this difference from "stock" account for the fact that my WOT RPM is less than called for in the manual.

Boat runs terrific in all respects and I have all the speed I need--just trying to make sure I'm operating it within the correct tolerance and not risking any issues. Many thanks in advance!
__________________
"This one goes to eleven." 2007 ProStar 197 TT w/MCX and Powerslot.
Reply With Quote
  #2  
Old 02-02-2013, 11:03 AM
Table Rocker's Avatar
Table Rocker Table Rocker is online now
MC Devotee
 
Join Date: Oct 2010
Boat: '96 ProStar 205, Sammy Duvall, LT-1
Location: Fayetteville, Arkansas
Posts: 1,577
The 12.5 x 12 prop is for the 1:1 trans. The factory powerslot prop is 13.7 x 17. The fact that you have less pitch and less WOT rpm confuses me. I would think that you would be banging your head on the rev limiter with that prop.

Check the ratio on your transmission tag. A 13.7 x 15 .80 is used with the 1.26:1 transmission. I know absolutely nothing about the TT boats.
Attached Images
 
__________________
'96 ProStar 205 SD LT-1

Last edited by Table Rocker; 02-02-2013 at 03:33 PM.
Reply With Quote
  #3  
Old 02-04-2013, 03:36 PM
EJ OJPROP's Avatar
EJ OJPROP EJ OJPROP is online now
MC Fanatic
 
Join Date: Mar 2005
Location: East Tennessee
Posts: 566
The gear ratio is 1.26:1 in TT boat. The 13.7 X 15 is the correct size for that ratio.
__________________
Eric Johnson
Johnson Propeller Co., Inc
OJ PROPS 800-359-9730
Reply With Quote
  #4  
Old 02-04-2013, 07:54 PM
Kweisner's Avatar
Kweisner Kweisner is offline
TT Enthusiast
 
Join Date: Oct 2012
Boat: 2007 Prostar 197
Location: Southeast
Posts: 400
Quote:
Originally Posted by EJ OJPROP View Post
The gear ratio is 1.26:1 in TT boat. The 13.7 X 15 is the correct size for that ratio.
Thanks Eric! So is it fair to say that the 4600RPM wide open os about what it should be? Thanks again.
__________________
"This one goes to eleven." 2007 ProStar 197 TT w/MCX and Powerslot.
Reply With Quote
Reply

Thread Tools
Display Modes

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


All times are GMT -4. The time now is 10:11 AM.