Pachanga 22 project Wet-Vett
 

I have an 1988 Sea Ray Pachanga 22ft
Dry weight 2800 lb.
SB Chevy 400 +30 over 406 ci
10.0:1 Compression ratio
Index and Complete balanced rotating assy.
100 octain Race Fuel
650 Holly Carb with a QFT quick set vacum secondarys
Elderbrock Hi Rise Dual Plain
Scat Crank FORGED 4340 LIGHTWEIGHT PRO COMP
Scat Rods 4340 FORGED I-BEAM ROD with ARP 3/8" Thru-Bolts
SRP INVERTED DOME Pistions 139625
Dart Eagle Cast Iron Heads 180cc/49cc
Manly 3 Angle Valves, 2.02/1.60
Scorpinon 1.6 roller tip Rockers
Howard Cam FT H230/240-10
Canton Oil Pan 8 quarts
Clayes Gear Drive
Replaced cerulating Pump w/ Cross over
Mercruiser 1.47R w/ hydomotive nose cone.

It gets to 60 real fast then falls on its face, was hopping for more like 79- 80 mph..

any suggestions.

ya mine took 550hp to get to 80

Was the engine dynoed? You may not have enough gitty up to see that speed. My pachanga has a bone stock 330 horse 454 with a alpha ss, spinning a 25-3 blade 67.4 mph. I would think you would be faster than me. :(

Never dynoed the motor, engine builder claimes its pushing 450 + HP. Whats got me is that originally I had a stock 350 that came with the boat at the time I bought it. And I was getting 65 mph on the GPS with a Quicksilver “cleaver” propeller (3) blade, stainless steel , but I spun the baring doing it.

RBT... BB or SB? and what do you have for parts?

I am curious! What kindda drive,prop,rpm's etc? Sounds to me like you are not running your engine in the sweet zone to me. I would think if you are maximizing 450HP you would be in the low 70's.

i hear ya megabite
 

89 p-22,454,30 over,blower pistons,7:4comp,eagle sir rods,merc525sc cam,flat tapplat,merlin 2 heads,310runners,stainless exaust,tbs250 blower,6pounds boost,1050 domanator carb,msd dis/box/rev limiter.30 degrees timming.28p bravo1 prop.i am guessing around 500hp.best gps 78 at 4700 rpm......drinks gas like no tomorrow.go figure.....?

I am running a 496, 25P Mirage Plus 5,000 RPMS and 75GPS
with a full cooler of beer:cool-smiley-027:

Yes, Elderbrock Hi Rise Dual Plain
Switch to a single plane, like a Dart.
And I did not see what kind of exhaust, stock?

I'm interested in propeller experiences on this boat.
I have installed a 496 HO with Bravo 1.50 ratio drive in a customer's P-22. The prop was a Bravo I 24p out of the box. The prop delivered a great midrange and hit 60 kts @ 5k rpm (69 mph), the boat was steady with a slight tendency to chine when hitting top speed. The prop was a great choice in regards to the guy being a little older and not a top skilled driver :D
My own P-22 has a HP 450 clone with Bravo I XR drive, 1.50 ratio. Ignition system will allow the engine to rev up to 5250 before hitting limiter. Due to unavailability of B1 24 p I took a chance and tried a 26 p instead. The boat accelerates at least as good as with the 496/24p but it feels like running higher with the stern causing the boat to chine walk already at 63 or so mph.
I was thinking about labbing the B1 to get some bow lift but it looks like 1BIGJIM has the prop key to speed. How does it run at top speed? Any other suggestions?