User Tag List

Page 2 of 3 FirstFirst 1 2 3 LastLast
Results 16 to 30 of 35
  1. #16
    Join Date
    Jan 2004
    Location
    Florida
    Posts
    19,038
    Thanks (Given)
    0
    Thanks (Received)
    580
    Likes (Given)
    0
    Likes (Received)
    6316
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    yes, the 850XS motors came from the factory with the XS gearcase. same housing as the 1500XS housing. different ratio. there were two different XS housings produced. early & late. early had more intake holes. later had less intake holes.
    Last edited by FUJIMO; 06-01-2019 at 06:39 PM.

  2. Likes Instigator liked this post
  3. #17
    Join Date
    Apr 2001
    Location
    Cardington Ohio
    Posts
    17,099
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Great thread!
    I'd rather be competitive w/junk I built in my garage than win w/stuff I bought.


    I refuse to allow common sense to interfere w/my boat buying decisions.


    Checkmate 16' 140 Johnson
    Hydrostream 17' Vector FrankenRude I
    Laser 480 (?) 21' w/GT 200
    Glastron Carlson Conquest w/XP 2.6
    Glastron Carlson CVX 20 w/XP 2.6
    24' Sonic w/twin 250 Johnsons
    24' Sonic w/twin 250 HO Johnsons
    19' STV River Rocket w/FrankenRude II
    Allison XR 2002 w/Frankenrude II
    Hydrostream 18' V-King w/Frankenrude II

  4. #18
    Join Date
    Aug 2011
    Location
    Antioch, il
    Posts
    145
    Thanks (Given)
    4
    Thanks (Received)
    10
    Likes (Given)
    5
    Likes (Received)
    47
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FMP View Post
    I'm wondering, maximum 70 ci or a couple more allowed. The triple CHRYSLER then i believe was a about 72 ci. Later in 78/79 they did put out a slightly shorter stroke for a specific reason , maybe class racing but marketed it for higher rpm running, along with a 17' leg and the newly introduced one piece lower, not a speed master type but the powerflow .
    I'm wondering if that short short stroke was a leftover from those class motors of a decade earlier, if sticking to the ci limit was absolute .
    Click image for larger version. 

Name:	Scan_20141004 (2).jpg 
Views:	31 
Size:	421.0 KB 
ID:	440448Click image for larger version. 

Name:	Scan_20141004.jpg 
Views:	25 
Size:	422.1 KB 
ID:	440449
    Yes, the Special Edition Charger was introduced for the Sport G class. For a few years there was a good field of Chryslers with TCPBA up in region 8. The Special edition was de-stroked to get under the 70 cubes limit for SG. Ron Baker worked for Chrysler and he was the force behind getting them back into OPC racing at the time. There were plenty of cleaver props available because the powerflows were 15 spline so Merc wheels fit. It was a good competitive class that was entertaining to watch.

  5. Thanks Instigator thanked for this post
    Likes FMP, Instigator liked this post
  6. #19
    Join Date
    Nov 2006
    Posts
    171
    Thanks (Given)
    1
    Thanks (Received)
    27
    Likes (Given)
    0
    Likes (Received)
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    850XS & 1500XS - Different Gear Ratios

    [QUOTE=FUJIMO;3137545]yes, the 850XS motors came from the factory with the XS gearcase. same housing as the 1500XS housing. different ratio. there were two different XS housings produced. early & late. early had more intake holes. later had less intake holes.[/QUOTE

    If it was possible to swap these gearcases (no visible signs of difference), how would you "inspect" for that? Comparison of hand-turning the flywheel with a marked position of the prop shaft? Would there be a performance advantage (hole shot) by using a 850XS case on a 1500XS and vice versa? Would anybody even think of this possibility during a breakdown inspection. Inspection criteria was always focused on engine bore/stroke displacement, exhaust ports, etc I know this thread is focused on SG but it now makes me wonder if gearcases were being swapped undetected in SJ considering how intensely competitive it was.

  7. Likes Instigator liked this post
  8. #20
    Join Date
    Jan 2003
    Location
    BRISTOL, FL
    Posts
    112
    Thanks (Given)
    41
    Thanks (Received)
    30
    Likes (Given)
    177
    Likes (Received)
    99
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    [QUOTE=WaterZebra;3137695]
    Quote Originally Posted by FUJIMO View Post
    yes, the 850XS motors came from the factory with the XS gearcase. same housing as the 1500XS housing. different ratio. there were two different XS housings produced. early & late. early had more intake holes. later had less intake holes.[/QUOTE

    If it was possible to swap these gearcases (no visible signs of difference), how would you "inspect" for that? Comparison of hand-turning the flywheel with a marked position of the prop shaft? Would there be a performance advantage (hole shot) by using a 850XS case on a 1500XS and vice versa? Would anybody even think of this possibility during a breakdown inspection. Inspection criteria was always focused on engine bore/stroke displacement, exhaust ports, etc I know this thread is focused on SG but it now makes me wonder if gearcases were being swapped undetected in SJ considering how intensely competitive it was.
    after having endured numerous inspections for records and national championships, i can assure you, gear ratios were one of the first things checked. it was one of the easiest. they even checked my water pump. to see if i had modified the impeller.
    The "Wheel Man" of the Sunshine Syndicate

  9. Likes Mark75H, Instigator liked this post
  10. #21
    Join Date
    Dec 2002
    Location
    South Florida
    Posts
    1,727
    Thanks (Given)
    0
    Thanks (Received)
    82
    Likes (Given)
    0
    Likes (Received)
    230
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    If all they were doing for inspection was weighing boats I guess you could get away with that kind of lower unit swap. In SJ I think they were running pretty much all the prop they could get on the those motors. I don't think they would handle the lower gear ratio very well at top end. They might get out of turns a little better but once they aired out they would likely overrun the power and torque curves of those stock power heads. An stock inline Mercury can only flow so much air.

  11. Likes Mark75H, Instigator liked this post
  12. #22
    Join Date
    Feb 2015
    Location
    Ontario
    Posts
    6,545
    Thanks (Given)
    159
    Thanks (Received)
    212
    Likes (Given)
    1480
    Likes (Received)
    1359
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by vintage v4 View Post
    Click image for larger version. 

Name:	Scan_20141004 (2).jpg 
Views:	31 
Size:	421.0 KB 
ID:	440448Click image for larger version. 

Name:	Scan_20141004.jpg 
Views:	25 
Size:	422.1 KB 
ID:	440449
    Yes, the Special Edition Charger was introduced for the Sport G class. For a few years there was a good field of Chryslers with TCPBA up in region 8. The Special edition was de-stroked to get under the 70 cubes limit for SG. Ron Baker worked for Chrysler and he was the force behind getting them back into OPC racing at the time. There were plenty of cleaver props available because the powerflows were 15 spline so Merc wheels fit. It was a good competitive class that was entertaining to watch.
    Yes thats the one, 1980. Tough to find that leg, I run the 20" with 1.73 powerflow. So how'd they get under the rules back in the late 60s ?

  13. #23
    Join Date
    Aug 2011
    Location
    Antioch, il
    Posts
    145
    Thanks (Given)
    4
    Thanks (Received)
    10
    Likes (Given)
    5
    Likes (Received)
    47
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by FMP View Post
    Yes thats the one, 1980. Tough to find that leg, I run the 20" with 1.73 powerflow. So how'd they get under the rules back in the late 60s ?
    They weren't allowed before they got under 70 cubes, they wouldn't have been competitive with the 2-piece lower anyway.

  14. Likes Mark75H liked this post
  15. #24
    Join Date
    Feb 2015
    Location
    Ontario
    Posts
    6,545
    Thanks (Given)
    159
    Thanks (Received)
    212
    Likes (Given)
    1480
    Likes (Received)
    1359
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    Quote Originally Posted by vintage v4 View Post
    They weren't allowed before they got under 70 cubes, they wouldn't have been competitive with the 2-piece lower anyway.
    I see, no factory race lower permitted.

  16. #25
    Join Date
    Dec 2002
    Location
    South Florida
    Posts
    1,727
    Thanks (Given)
    0
    Thanks (Received)
    82
    Likes (Given)
    0
    Likes (Received)
    230
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    The original SG motors were DR motors and could run Speedmaster lower units if I remember right. Maybe Sportmaster units as well. Lil Abner and Olegator will know for sure.

  17. #26
    Join Date
    Nov 2006
    Posts
    171
    Thanks (Given)
    1
    Thanks (Received)
    27
    Likes (Given)
    0
    Likes (Received)
    71
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)

    Cool Wild West (Region10)

    Quote Originally Posted by 99fxst99 View Post
    Don't know about this, but I do know of a JP boat that ran an 850 gearcase for a long time and was never caught. No one ever thought to check it. It was said to help acceleration on a short course turning a bigger prop slower.
    Don't know how true that was be he always ran good!
    (LOL) Out here in the wild west, I guarantee you nobody ever checked gear ratios. Even the inspectors schools (region certified) didn't cover it. Now I'm beginning to wonder how many US1 and region high points titles were legitimate? This is something that was out of reach for many weekend racers. Either you had deep pockets for acquiring a myriad of engine components to experiment with or had access to a large inventory of parts (dealer) to find the "perfect" part by dimension / weight. In other words: blueprinting. One of the reasons I quit racing. Did it for the fun and technical experimentation and not to throw an endless pile of $$$ at it. Now that I look back on it, I think the SG class would have really been something using a Merc 850XS on a Sport E hull (with a safety cell of course).

  18. Likes Instigator liked this post
  19. #27
    Join Date
    Dec 2002
    Location
    South Florida
    Posts
    1,727
    Thanks (Given)
    0
    Thanks (Received)
    82
    Likes (Given)
    0
    Likes (Received)
    230
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    I got torn down several times over the years. Twice by Edgar Rose himself. Never failed a motor inspection.

  20. Thanks Instigator thanked for this post
    Likes Instigator liked this post
  21. #28
    Join Date
    Jan 2004
    Location
    Florida
    Posts
    19,038
    Thanks (Given)
    0
    Thanks (Received)
    580
    Likes (Given)
    0
    Likes (Received)
    6316
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)
    2us70...only winners got torn down. congrats.

  22. Likes Instigator liked this post
  23. #29
    Join Date
    Jan 2013
    Location
    south florida
    Posts
    30
    Thanks (Given)
    0
    Thanks (Received)
    10
    Likes (Given)
    1
    Likes (Received)
    15
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Click image for larger version. 

Name:	Screenshot952019-06-11-20-27-51~2.png 
Views:	181 
Size:	1.07 MB 
ID:	441495

    May still be his favorite boat.

  24. #30
    Join Date
    Jan 2004
    Location
    Florida
    Posts
    19,038
    Thanks (Given)
    0
    Thanks (Received)
    580
    Likes (Given)
    0
    Likes (Received)
    6316
    Mentioned
    2 Post(s)
    Tagged
    0 Thread(s)

Page 2 of 3 FirstFirst 1 2 3 LastLast

Similar Threads

  1. 1987 Baja 220 Sport Kevlar (Class 7 Race Boat) !! Hull and trailer
    By fvetere in forum Hulls larger than 20'
    Replies: 7
    Last Post: 04-30-2015, 07:59 PM
  2. New Entry Level Outboard Class at Blarney Island - Pro Sport Outboard
    By Sam Baker in forum General Boating Discussion
    Replies: 63
    Last Post: 05-03-2012, 08:07 PM
  3. b class (sport c) setup
    By rjw in forum Props, Setup, and Rigging
    Replies: 0
    Last Post: 03-27-2008, 10:33 PM
  4. Class C & Class D racing....
    By Krazy K in forum General Boating Discussion
    Replies: 1
    Last Post: 05-07-2005, 04:23 PM
  5. Sport c class which motors allowed.
    By riverrat321 in forum General Boating Discussion
    Replies: 2
    Last Post: 10-24-2003, 11:45 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •  
Diamond Marine