Re: Mercruiser w/ Ford 351w timing / runability / issue
So here is the end all update .
I replaced the distributor with a good used working part. The motor cranked right up and idled smooth. I set the timing on it 10* btdc. The engine has throttle response up to 6000rpm in neutral.
I towed it to my local boat shop and payed for the dyno hook up on it. According to his numbers I should have around 2600-3100 psi of thrust on the machine. Wide open at about 4000 rpm we were sitting at around 2000psi. So basically running at 66% according to his dyno. This isnt too far from what I expected to see being that my compression numbers are lower than they should be and cylinder 6 still has issues. He showed me my impeller in the outdrive needed to be replaced so I bought one and swapped it out. The engine runs at an acceptable temperature. It doesnt stall or backfire. It doesnt leak anymore. I also replaced the prop with a decent used prop as mine had spun the inside rubber.
He said I would be lucky to see 10mph on the lake with the dyno results. Im not so sure I 100% believe that but I take it for what its worth. My first outing on the boat it ran about 2000 - 2800rpm on the lake, roughly 30mph. It was sluggish getting there but it did get there. I plan to do a lake test to see the results first hand before going any further. The cost of the reman long block is more than I want to add to this boat at this time so it might go up for sale as is with the bad cylinder.
I appreciate all the help and feedback.
So here is the end all update .
I replaced the distributor with a good used working part. The motor cranked right up and idled smooth. I set the timing on it 10* btdc. The engine has throttle response up to 6000rpm in neutral.
I towed it to my local boat shop and payed for the dyno hook up on it. According to his numbers I should have around 2600-3100 psi of thrust on the machine. Wide open at about 4000 rpm we were sitting at around 2000psi. So basically running at 66% according to his dyno. This isnt too far from what I expected to see being that my compression numbers are lower than they should be and cylinder 6 still has issues. He showed me my impeller in the outdrive needed to be replaced so I bought one and swapped it out. The engine runs at an acceptable temperature. It doesnt stall or backfire. It doesnt leak anymore. I also replaced the prop with a decent used prop as mine had spun the inside rubber.
He said I would be lucky to see 10mph on the lake with the dyno results. Im not so sure I 100% believe that but I take it for what its worth. My first outing on the boat it ran about 2000 - 2800rpm on the lake, roughly 30mph. It was sluggish getting there but it did get there. I plan to do a lake test to see the results first hand before going any further. The cost of the reman long block is more than I want to add to this boat at this time so it might go up for sale as is with the bad cylinder.
I appreciate all the help and feedback.