05-06-2010, 08:59 AM #1
86 MM 65U
Porting by reputable Woody/TJ/Lowell/Lamey
13/21 J prop "Impros"
= xxxxxxxxx Speed
7X+ MPH something
05-06-2010, 09:01 AM #2
Get on the water, and finish that equation!
05-06-2010, 09:02 AM #3
05-06-2010, 09:05 AM #4
05-06-2010, 09:10 AM #5
Was a question on speed.....not that I'm running that
05-06-2010, 09:13 AM #6
then throw in a stroked crank as well and some spray
05-06-2010, 09:22 AM #7
Just curious to the limits of the 65U w/out pipes and or stroked crank..... Noticed the porting from a reptuable person statement. I guess I'm just curious out there what is the limit for the package without going to the NON OEM cases/cylinder.
The statement does not include folks running stokers and or Pilo who really does not have a 65U engine since it's a rare almost "one off" engine
05-06-2010, 09:23 AM #8
05-06-2010, 09:29 AM #9
My current set up
84.5 MM pro-x pistons
Tim Judge ported Pump gas cylinder
Dan Lamey Ported cases
Mikuni 46mm carbs W/ F/A
Riva CDI set on MOD 1
Port matched R & D intake by Tim Judge
ADA girdled head running 155psi
63M Raider exhuast
Solas XO prop
Pro-tec Intake grate
Fuel pressure liquid gauge
Pet 2100DX tach
5 Degree GP1200 nozzle
I would suspect I'm putting about 155hp
05-06-2010, 09:37 AM #10
Fill in the blank
Stock 65 U GP1200 engine = 135hp
GP1200 w/ Tripple pipes "no porting" = 155 hp ?
GP1200 single pipe with porting "pump gas" = 155hp ?
GP1200 Big bore 85.5- 86.0 mm = 150hp?
GP1200 Big bore Flat top 85.5- 86mm = 160hp?
GP1200 single pipe w/ Race porting = 150hp?
Gp1200 tripple pipe w/ big bore 85.5-86mm = 175hp ?
GP1200 Big bore 85.5- 86.0 mm w/ porting "pump gas" = 160hp ?
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