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  1. #1
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    Tell me about the Sport G class

    Specs and speeds,Thanks guys.
    Bob

  2. #2
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    As I recall it was a 70 ci class using product in motors. The first G boats I remember ran inline 6 Merc 700s. There are pictures of a early G class Raveau scattered around on this forum. For a brief time Chyrsler produced a competitive G class motor. Finally the 4 cylinder Merc 800s then the 850s defined the class. In the early 70s the boat length was dropped to 13 feet. I ran a little of both SG and G production in those days. A good SG boat ran over 70 mph but I don't remember exactly how fast we were running.

  3. #3
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    Quote Originally Posted by 2us70 View Post
    As I recall it was a 70 ci class using product in motors. The first G boats I remember ran inline 6 Merc 700s. There are pictures of a early G class Raveau scattered around on this forum. For a brief time Chyrsler produced a competitive G class motor. Finally the 4 cylinder Merc 800s then the 850s defined the class. In the early 70s the boat length was dropped to 13 feet. I ran a little of both SG and G production in those days. A good SG boat ran over 70 mph but I don't remember exactly how fast we were running.
    and if you wanted to keep up with mark hauptner, it looked like you needed to run about 5+ mph faster lol!!!
    The "Wheel Man" of the Sunshine Syndicate

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  5. #4
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    That was for sure. I never ran against Mark in SG but I did race him plenty of times in SE.

  6. #5
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    Click image for larger version. 

Name:	Dans 13' Wildcat3.jpg 
Views:	42 
Size:	81.6 KB 
ID:	440290In 1970 I ran 64 mph with my Hustler 13' and Merc 80
    Hustler 15' Wildcat / Merc 80
    Hustler 13' Wildcat / Merc 80
    Hustler 13' Picklefork(Experimental) / Merc 80
    Hustler 16' Victor / Evinrude 85
    Hustler 15' Tunnel / Evinrude X115
    Hustler 17' Lark / Suzuki 140 (current)
    Ranger 17' Aztec / Merc 115 (current)
    Hustler 16' Victor / Merc 125 (current)
    Hustler 16' Victor / JohnRude 135 (current and restored)
    Hustler 15' Family Tunnel (current project)

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  8. #6
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    G Boat Shaft Length

    Quote Originally Posted by 2us70 View Post
    As I recall it was a 70 ci class using product in motors. The first G boats I remember ran inline 6 Merc 700s. There are pictures of a early G class Raveau scattered around on this forum. For a brief time Chyrsler produced a competitive G class motor. Finally the 4 cylinder Merc 800s then the 850s defined the class. In the early 70s the boat length was dropped to 13 feet. I ran a little of both SG and G production in those days. A good SG boat ran over 70 mph but I don't remember exactly how fast we were running.
    Were the Merc 800s and 850s all short shaft models? Aside from kicker fishing motors, I don't think anybody makes the bigger engines less than 20 inches these days. My first "big" outboard was a Merc 800. Ran all day at WOT and never missed a beat. They were a strain to manually tilt. At least the straight 6's had enough top mass / weight to "counterbalance" the mid section and gearcase.

  9. #7
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    If you ran SG in the Mid-Atlantic in the 70s you had to beat Rayner Blair!
    18 Talon/2.4 carb SOLD
    26 Deck Boat/250 Merc

  10. #8
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    OPC boat of that era pretty much ran short shaft motors. I never owned a long shaft motor until I bought a fishing boat in 2001. The 800s and 850s shared the same gear case with the 1500s. They had a much lower gear ratio allowing them to run the same propellers as the 1500s. Those great big slow turning props really worked well on the G class boats.

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  12. #9
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    Cool 1500XS Lower Unit inn SG?

    Quote Originally Posted by 2us70 View Post
    OPC boat of that era pretty much ran short shaft motors. I never owned a long shaft motor until I bought a fishing boat in 2001. The 800s and 850s shared the same gear case with the 1500s. They had a much lower gear ratio allowing them to run the same propellers as the 1500s. Those great big slow turning props really worked well on the G class boats.
    It probably wasn't "legal" for SG but did anybody ever try to run a low water pick up 1500XS gearcase on a Merc 800 nor 850? (LOL)

  13. #10
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    The 850xs may have had a low water pick up. I stopped racing just before the xs motors came out so I never saw one up close.

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  15. #11
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    850xs

    Quote Originally Posted by 2us70 View Post
    The 850xs may have had a low water pick up. I stopped racing just before the xs motors came out so I never saw one up close.
    I completely forgot about the 850XS! Seems that all the Merc racing press releases were focused on the 650XS and 1500XS. I think you can thank OMC and the SE class for overshadowing the FG and SG classes and 850XS. Was SG / 850XS, etc ever run in Europe? I suppose the 850XS did not run in Mod 50 against OMC because of displacement. Not sure that and 850 would stand up to OMC's Mod 50 / 110 hp output? I think Merc kind of softened their grip limiting sales of the XS models to "qualified racing enthusiasts" (APBA) not like what the did with Twisters, T2, T2X etc. Only time "XS" showed up again on decals was for the 1750XS (T3). "XS" has only since reappeared in 2019 (4 stroke market). I think the 850XS only showed up in Merc's product catalog for 2 years (1976, 1977)?

  16. #12
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    Yeah, E is 49ci and the 800, 850 and 850XS were 66ci. The original XS motors had to be advertised in the regular catalog and sold thru regular dealers to qualify as production motors

  17. #13
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    Quote Originally Posted by 2us70 View Post
    As I recall it was a 70 ci class using product in motors. The first G boats I remember ran inline 6 Merc 700s. There are pictures of a early G class Raveau scattered around on this forum. For a brief time Chyrsler produced a competitive G class motor. Finally the 4 cylinder Merc 800s then the 850s defined the class. In the early 70s the boat length was dropped to 13 feet. I ran a little of both SG and G production in those days. A good SG boat ran over 70 mph but I don't remember exactly how fast we were running.
    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 .

  18. #14
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    Quote Originally Posted by WaterZebra View Post
    It probably wasn't "legal" for SG but did anybody ever try to run a low water pick up 1500XS gearcase on a Merc 800 nor 850? (LOL)
    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!
    18 Talon/2.4 carb SOLD
    26 Deck Boat/250 Merc

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  20. #15
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    Sounds like a plan to me. I wish I had thought of that trick when I was running EP. Might have helped me against those OMC loopers. In a production class that might not make the motors run out of revs but in a sport class with much lower weight limits you would probably over rev the motors too much.

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