85-90+?
 

http://chicago.craigslist.org/nwc/boa/4390725771.html

85-90+ ? Really?

Without riding in it I would guess more like 75-80. What props he has will tell you something.

my paul pfaff 750s in my non step 35 only run middle 90s

Not sure I would chance pulling that trailer that fast.

Can TRS drives really handle that?

Not any more or less than if it had Bravos.

I agree though. 650HP a side in that boat, more like 75-78mph. That boat with a pair of 750's, would be lucky to see mid 80's.

The end of last summer I repowered my 1985 12 meter with all new natural 700hp/670tq running speedmaster 3's and 16.5x 25 3 blades and only hit 76. Now that was in flat water full of fuel at 5300 r's for just a few seconds here and there (still breaking in). My goal is to prop to around 5600 and throw a little chop under that heavy bi*ch and hope to pass 80, but im sure by not that much. Hitting 85-90 would only come with a broken gps or water powered speedo lol

How come they are so slow? I'd be very disappointed if two blown 502s didn't get me 85 mph. I would definitely get the boat surveyed since some of the older Fountains are showing rot in the transom and stringers. Anyway it looks like a decent deal to me.

It's not just about blown 502s. St about horsepower and torque. The straight bottom fountains take a little bit to get up on the pad then they run. A twin step boat is a different animal.

650 is easily attainable n/a so depending on build those motors may have a ton of potential to open up.

A pair of 502 with flat tappet cams, GM iron heads, and a 250 blower , would be a far cry from a 502 with brodix, dart, or afr heads, an 871 blower.

A buddy of mine had 650hp 502 with 250 blowers in his 38 straight bottom cig. It did 69-71mph.

My non stepped 38 with SSM drives and 800's, runs a tick under 90mph. These old hulls take some power to run honest good speed numbers.

Also, my 1990 38 is dry as a bone hull wise. But yes, any older boats you need to check for rot. I've seen it on fountains, cigarettes, formulas and donzis.

Yes, rot is not limited to Fountains!

My single step 97 29 Fountian with twin 502 EFIs and 250 blowers (4 lbs boost) going thru XRs would run a top speed of 93. Typical numbers though are around 89 with a full load and fuel tank topped off. I typically run Bravo 1 32p props but have run labbed 30p before as well but lose some top end. I just did a full rebuild on my engines to 509s due to low compression (engines had about (360 hours) but have not yet put them back in and run them. Not sure on the HP numbers because I have never had them dynoed.