1977 85hp v4

[andrew j cox]

hi guys, just wondering if theres any tricks to getting a bit more power out of my 85hp v4, ive just done a stern drive conversion i doiked my old antique volvo and modified my transom for the v4, my boat is a 17 foot fish ski runabout, im thinking a new hydrofoil on the leg and maybe a new stainless prop,
would the tilt trim pumps be avail after market? also the trims been bypassed, likeky culprit blocked valved in pump or would the ram be stuffed?

 

[emdsapmgr]

Your 85 is the small bore V4 crossflow. At 92 cubic inches, it is a little undersize, but still, a great performer. The fact that the engine is a small cube one-means you can't put high compression heads on it from a 140. Still, the factory heads should yield 125 lbs compression-pretty good. Two things you can do: Add a pair of 135 carbs 1 5/16" throats. You'll have to rejet, but will see a big difference. Also, add the NLA rubber intake filler blocks from a 79 115/140, part number 322684 (qty 4) You'll get an extra 3-5 hp. The addition of composite reeds make for nice idling and will improve the midrange pickup.

 

[boobie]

I'd look for a bigger motor. JMHO.