26x14.5 yamaha drag prop

gmc · 19-11-2010, 03:31 PM

hi for sale only used for 1 run £300 p+p as new

lloyde · 19-11-2010, 04:28 PM

I will have it

gmc · 19-11-2010, 05:10 PM

hi lloyd ,no probs and thanks

andymac · 19-11-2010, 05:23 PM

you'l need more than a prop to out run the mutz trust me i've tried

lloyde · 19-11-2010, 05:29 PM

Quote:

Originally Posted by andymac

you'l need more than a prop to out run the mutz trust me i've tried

Looks like I also have the engine as well watch this space

still no worries · 19-11-2010, 05:31 PM

Quote:

Originally Posted by andymac

you'l need more than a prop to out run the mutz trust me i've tried

how fast is mutz then ????

still no worries · 19-11-2010, 05:33 PM

Quote:

Originally Posted by gmc

hi for sale only used for 1 run £300 p+p as new

hi john.
we are playing in the tamar tomorrow afternoon if interested !

gmc · 19-11-2010, 05:35 PM

Quote:

Originally Posted by still no worries

hi john.
we are playing in the tamar tomorrow afternoon if interested !

see you there boys..

lloyde · 19-11-2010, 05:58 PM

Quote:

Originally Posted by still no worries

how fast is mutz then ????

Steve said it's 90 + all I know it's very fast

TWIN RIG · 19-11-2010, 06:07 PM

Quote:

Originally Posted by lloyde

Steve said it's 90 + all I know it's very fast

Anybody got any proof of it doing 90+ ? I've seen a lightweight Phantom 20 with a 300xs fitted that struggled to do 83 in the hands of a very experienced driver .

lloyde · 19-11-2010, 06:22 PM

I think you will find the record for a 20 is 96. Something

andymac · 19-11-2010, 06:24 PM

was it a short shaft mad efi ?

andymac · 19-11-2010, 06:32 PM

what motor u got ? i need one to.

TWIN RIG · 19-11-2010, 08:37 PM

Quote:

Originally Posted by lloyde

I think you will find the record for a 20 is 96. Something

97.64 actually with a modified 2.5 . A 300 Promax would get nowhere near that . Way to heavy

lloyde · 19-11-2010, 09:32 PM

Quote:

Originally Posted by TWIN RIG

97.64 actually with a modified 2.5 . A 300 Promax would get nowhere near that . Way to heavy

Like I'm bothered

Ringmaster · 19-11-2010, 09:37 PM

Quote:

Originally Posted by andymac

you'l need more than a prop to out run the mutz trust me i've tried

I'M looking out there mr mac.... But I fail to see you infont....!

andymac · 20-11-2010, 01:50 AM

too heavy,thats what i said.but if you ask Ross mac(puppiesballs)i'm sure he'lltell you the diet it went on..

OH and he done it at about 17 years old fair play to the boy

RossM · 11-12-2010, 11:04 PM

Quote:

Originally Posted by TWIN RIG

Anybody got any proof of it doing 90+ ? I've seen a lightweight Phantom 20 with a 300xs fitted that struggled to do 83 in the hands of a very experienced driver .

Well Ive been in the boat doing those speeds....

Mutz Nuts is a light built P20, Engine is a 3.0L merc which started out as a 300 promax, and after the following mods it makes 355hp and 370ft pounds of torque!

MAD EFI High compression Heads
MAD EFI Tripple intake
MAD EFI Short Shaft Midsection
MAD EFI Exhaust tuner
MAD EFI Remapped Fuel ECU
MAD EFI Fuel Adjuster (Fuelling adjustable from drivers seat)
MAD EFI Remapped Ignition ECU
MAD EFI Timing bracket (adjustable timing)
MAD EFI Quad gearbox oil seal conversion
Simon Motorsports Drystacked exhaust
EGT's, CHT & RPMS all monitered by quad Digatrion

Engine went on a diet which included the following

All Standard fuel system removed including canister, both intergrated fuel pumps, both oil reservoir's
Light weight drive shaft (1/4 the weight of the original)
The engine modification all reduced weight significantly aswell such as the change to the MAD EFI intake which saved 11lbs the exhaust tuner was 8lbs lighter, the 5" shorter mid section was significantly lighter

Overall dry weight is just over 180kgs which is about the same as a 20" offshore XR2!

I have driven Mutz @ 85mph (gps) and jabbing the throttle even at that speed the boat still lunges forward.
The shortshaft & belly petrol tank which were added to lower center of gravity worked so well and now the mutz is VERY stable and at those speeds.

The boat handles a thousand times better than when it had the standard 300 promax with a long shaft so I can completely see where your coming from, however this really cant be described as a 300 promax anymore

7k rpm pushes the boat to mid 90's with 10% prop slip

.....7.5K theoretical speed = 102mph with 10% slip

The limiter is 7500 rpm, gear ratio is 1.615:1 & prop is 26" if you want to confirm the figures. (Wayne Taylor, Owner of MAD EFI suggested setting limiter @ 8k however we decided 7.5 to prolong the life of the engine.

With the amount of torque that this motor makes combined with a light setup I dont think it would struggle to hit the limiter.

Burty · 12-12-2010, 12:37 AM

Ross dude, no offence but have you actually had the boat at 90mph?? the reason I ask is because I have only achieved 85+ twice and the other times i have tried were problematic!! 2 hooks and an explosion!!!!! Hutchy is obviously alot braver than me because that 90mph run I did I can honestly say I didn't enjoy one second of it!!!

TWIN RIG · 12-12-2010, 10:05 AM

Quote:

Originally Posted by PuppiesBalls

Well Ive been in the boat doing those speeds....

Mutz Nuts is a light built P20, Engine is a 3.0L merc which started out as a 300 promax, and after the following mods it makes 355hp and 370ft pounds of torque!

MAD EFI High compression Heads
MAD EFI Tripple intake
MAD EFI Short Shaft Midsection
MAD EFI Exhaust tuner
MAD EFI Remapped Fuel ECU
MAD EFI Fuel Adjuster (Fuelling adjustable from drivers seat)
MAD EFI Remapped Ignition ECU
MAD EFI Timing bracket (adjustable timing)
MAD EFI Quad gearbox oil seal conversion
Simon Motorsports Drystacked exhaust
EGT's, CHT & RPMS all monitered by quad Digatrion

Engine went on a diet which included the following

All Standard fuel system removed including canister, both intergrated fuel pumps, both oil reservoir's
Light weight drive shaft (1/4 the weight of the original)
The engine modification all reduced weight significantly aswell such as the change to the MAD EFI intake which saved 11lbs the exhaust tuner was 8lbs lighter, the 5" shorter mid section was significantly lighter

Overall dry weight is just over 180kgs which is about the same as a 20" offshore XR2!

I have driven Mutz @ 85mph (gps) and jabbing the throttle even at that speed the boat still lunges forward.
The shortshaft & belly petrol tank which were added to lower center of gravity worked so well and now the mutz is VERY stable and at those speeds.

The boat handles a thousand times better than when it had the standard 300 promax with a long shaft so I can completely see where your coming from, however this really cant be described as a 300 promax anymore

7k rpm pushes the boat to mid 90's with 10% prop slip

.....7.5K theoretical speed = 102mph with 10% slip

The limiter is 7500 rpm, gear ratio is 1.615:1 & prop is 26" if you want to confirm the figures. (Wayne Taylor, Owner of MAD EFI suggested setting limiter @ 8k however we decided 7.5 to prolong the life of the engine.

With the amount of torque that this motor makes combined with a light setup I dont think it would struggle to hit the limiter.

All ifs and buts . Have you any proof it will do these speeds ? Why not take it to Coniston records week ?

If these speeds are true and you've got the balls and driving skill you've got a record breaker .