DucBoy

Thanks for the input!

mikes280

why just a 850 seems small to me i run 1050's on a lot smaller motors and when going from a 850 on a 540 to a 1050 i made 30 more hp

mikes280

TQ curve is nice and flat hp # look pretty good for that cam and carb

bobsbillets

The way I read it he is running 2 850's.....

mikes280

could be, i thought he was talking about 2 motors

CB-BLR

Torque seems low to me also.

My N/A 540 made 685hp/682tq with AFR 305 cnc's, a 1050 dominator carb, a victor intake, a 1" supersucker carb spacer, 9.4 lbs of compression, and a RMBuilder cam. This was with all accessories running, and through wet exhaust on 92 octane fuel. Bob told me I could have picked up another 20-25 hp with a set of AFR 315's, but I didnt have the coin at the time.

I would contact Bob Maderia aka RMBuilder for setting up that motor combination. I am willing to bet your cam is not ideal for your motor among other things.

His number is: 585-654-8583

Chris

customryder

Be Happy the drives will not hold what you have now..

just my 02ct.

DucBoy

Thanks for the responses. Single 850 (two motors, one carb each). Used the 850s because I had them on the shelf - I think moving up to 1050s would make sense.

I should elaborate that my goal was usable power over the full range (including idle - it's a ways from the dock to the open water) with long-term engine reliability. I'm more of a fast cruise than an all-out race kind of boater.

DucBoy

Yes, that is my next chore - learning how to rebuild drives...

mikes280

they also make a 1000cfm carb on a 4150 base , you could try without having to change the intake. But on the 540 that i got 30 hp out of with the 1050 we used a adapter for a 4500 to a 4150 intake i am sure a large intake would have made more.i am doing a 496 now and we plain to use a 1050 i did 2 of these 3 years ago and made 640 apiece so we are doing one more killer is the 496 made more power with the 1050 also.