Re: Merc 20Hp -69 Increase output for racing
No way to machine the "cylinder cover" as it is part of the block. The cover you see is not a cylinder head - it is a water jacket cover.
Regardless, anything you do to a bone stock motor with the full gearshift leg will likely not be noticed in actual improved performance due to lack of propeller selection. Personally, I'd spend my time on set-up and making sure you're getting all 20 original ponies. There are a few props that are available - including a rare brass prop by Michigan.
If you really want to wake up the 20, put it on a direct drive lower unit from a Merc KE7 and build up a "Rat Racer".
Hi
Thank you for cool pic.
How much rpm can you take out?
The boat i have is deep V-type weight 265 lbs
I will lift up engine to max.
Im planning to use a cleaver prop. Not sure about pitch. I have to try different types.
Or do you prefer Michigan prop ?
I have not yet managed to get cyl cover off since top part has not yet moved. 6 Pin bolts very rusty.
I will se if possible to take off material from the block.
What do you think if i chnage the nozzle to 0,081 for the carb ?
How much can i chnage the timing of ignition ?
Normaly little bit earlier have can give more power and lower exhaust gas temp.