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1988 Gran sport motor rotation
Posted: Sat Oct 16, 2021 8:43 am
by RMO
I have 1988 Gran sport , needing repower , trying to determine if these motors are counter rotating or same or, does the transmission change the rotation, also looking to find out what transmission is actually in this boat , thanks.
Re: 1988 Gran sport motor rotation
Posted: Mon Oct 18, 2021 9:45 am
by Seaweed88
1988 was the last year for counter rotating engines, mine are indicated on valve cover label. You can also start the engine and watch rotation or have someone crank and you watch. Standard rotation engines are reversed in the transmission. I have a st tropez with big blocks my trans model is 10-05-000-011. 1.51:1 ratio , mine is an 88 with counter rotating engines.
Re: 1988 Gran sport motor rotation
Posted: Mon Oct 18, 2021 12:27 pm
by RMO
Thanks. only have one motor to check valve cover, incidentally how do you like the St. Tropez??
Re: 1988 Gran sport motor rotation
Posted: Tue Oct 19, 2021 7:51 am
by Seaweed88
Another method to check for counterrotating engine would be the firing order
Re: 1988 Gran sport motor rotation
Posted: Tue Oct 19, 2021 7:57 am
by Seaweed88
St Tropez is an awesome boat, plenty of space bu small enough for the woman and I to handle alone. She’s a thirsty gal though ⛽️
Re: 1988 Gran sport motor rotation
Posted: Tue Oct 19, 2021 5:41 pm
by Billm
On the counter rotating engine, the hoses going into the raw water pump are reversed. This is very apparent if you can view both engines side by side.
Re: 1988 Gran sport motor rotation
Posted: Sat Nov 06, 2021 12:41 pm
by RMO
Seaweed88 wrote:Source of the post 1988 was the last year for counter rotating engines, mine are indicated on valve cover label. You can also start the engine and watch rotation or have someone crank and you watch. Standard rotation engines are reversed in the transmission. I have a st tropez with big blocks my trans model is 10-05-000-011. 1.51:1 ratio , mine is an 88 with counter rotating engines.
Not understanding your reply, so the engines are counter rotating but, the trans reverses them? Or are they the same standard rotation and the trans just reverses one???