300r vs 300xs on same boat

**Chaz** · 02-13-2020, 11:43 PM

Originally Posted by powerabout

thats hanging onto 200? hp but how much torque?

Have you ever used a 3/4" impact gun, or torque wrench ??? Drive shaft "splines" is a square drive.
The "black washer" is a timken style bearing, the race behind it the thrust face, just as the back of the "ring gear" is.
All three propshaft bearings have a groove on the outer race to locate it. And the back two have a thrust collar between them.
Straight cut gearset is at least a 12 DP .. you can rest assured it's either 8620 or 9310 carburized steel.

Chaz = thinkin, you won't break one anytime soon ...

**Dave Strong** · 02-14-2020, 12:40 AM

Originally Posted by Chaz

Have you ever used a 3/4" impact gun, or torque wrench ??? Drive shaft "splines" is a square drive.
The "black washer" is a timken style bearing, the race behind it the thrust face, just as the back of the "ring gear" is.
All three propshaft bearings have a groove on the outer race to locate it. And the back two have a thrust collar between them.
Straight cut gearset is at least a 12 DP .. you can rest assured it's either 8620 or 9310 carburized steel.

Chaz = thinkin, you won't break one anytime soon ...

Dave thinks impact stuff has no place on engines, just saying. The special rattle is best left to those who do not understand.

Dave

**powerabout** · 02-14-2020, 12:59 AM

Looks way easier to setup than an sst45 that doesnt split

**Instigator** · 02-14-2020, 08:13 AM

I’ve always loved the hot rod V-6 stuff butttttt, when I went to my first kneel down race in the ‘70’s, and saw my first, true, “Pro/Alky” class motor..., it all changed.

Four cylinder, horizontally opposed, two (or four) expansion chambers, on slides to adjust their “tuned length”, real race gear cases, 6” mid sections, rope start, methanol fuel and castor oil, so much compression that each crew had A guy to “rope the motors”, so high strung that you needed two more crew members to hold the back of the boat out of the water so you could rope the motor, 10K+ RPM, rotary valves, weighed 65 lbs, and the 500cc’s are now close to 200 HP’s, and they came from the factory that way........

**Chaz** · 02-14-2020, 08:55 AM

Originally Posted by Dave Strong

Dave thinks impact stuff has no place on engines, just saying. The special rattle is best left to those who do not understand.

Dave

750 ft/lbs / 1200 break away . Perfect for 1/4x20 or 6x1.0mm bolts ..

I had to make sure that guy didn't borrow my "hi-grunt" 90* ...

**baja200merk** · 02-14-2020, 09:43 AM

The 300r will make 400 naturally aspirated once someone does a 93 octane tune for them.

**mjw930** · 02-14-2020, 09:51 AM

Originally Posted by baja200merk

The 300r will make 400 naturally aspirated once someone does a 93 octane tune for them.

Make it like many of the car tunes where I can select the tune based on the quality of fuel available and I'm all in but I doubt the ECM is capable of that.

**Capt.Insane-o** · 02-14-2020, 10:15 AM

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Originally Posted by Instigator

I’ve always loved the hot rod V-6 stuff butttttt, when I went to my first kneel down race in the ‘70’s, and saw my first, true, “Pro/Alky” class motor..., it all changed.

Four cylinder, horizontally opposed, two (or four) expansion chambers, on slides to adjust their “tuned length”, real race gear cases, 6” mid sections, rope start, methanol fuel and castor oil, so much compression that each crew had A guy to “rope the motors”, so high strung that you needed two more crew members to hold the back of the boat out of the water so you could rope the motor, 10K+ RPM, rotary valves, weighed 65 lbs, and the 500cc’s are now close to 200 HP’s, and they came from the factory that way........

**baja200merk** · 02-14-2020, 10:54 AM

Originally Posted by mjw930

Make it like many of the car tunes where I can select the tune based on the quality of fuel available and I'm all in but I doubt the ECM is capable of that.

the new flex fuel cars and trucks have alcohol sensors in the fuel system and adjust accordingly for it. That would be nice but I’m guessing you’d have to tune it to the fuel you run.

**JrCRXHF** · 02-14-2020, 12:51 PM

Originally Posted by baja200merk

the new flex fuel cars and trucks have alcohol sensors in the fuel system and adjust accordingly for it. That would be nice but I’m guessing you’d have to tune it to the fuel you run.

https://www.haltech.com/how-flex-fuel-control-works/

This might shine some light how they do it in the aftermarket world. I have not looked into the 300R to know if it is a DI or Port injection motor. But the VE tuning and flex fuel is pretty much standard in the aftermarket car world.

**Instigator** · 02-14-2020, 03:04 PM

There’s a thread on OSO showing a notice from Merc warning that A., they will be checking computers for manipulation and will cx warranties accordingly and that B., the EPA is also watching and they have already nabbed a few.

**Chaz** · 02-14-2020, 06:22 PM

Originally Posted by baja200merk

The 300r will make 400 naturally aspirated once someone does a 93 octane tune for them.

100 HP in a type~a~writer ...

Why ya wanna tease the Merc bouyyyyssss ...

Hey .. can ya flash a set of these 10:0 /1's in , while I wait ...

**Capt.Insane-o** · 02-14-2020, 06:58 PM

300+ on 87 octane...I would leave the damn thing alone. What it needs is to be five inches shorter.

**engineermike** · 02-14-2020, 07:14 PM

Like this?

https://www.powerboatracingworld.com...ted-for-f1h2o/

**Chaz** · 02-15-2020, 11:20 PM

From crickets to corn E-98, E-85, E-10, M-1 wood, 87, 93, C-16, Q-16, NOSMAX120, and CH3N2O .. since it's Mercury ... All those tunes will be on compact

disc's

available from Mercury racing direct, or Wal-Mart's

muz-ak

section.. just plug one in the stereo. Or for the ballers, load up a CD changer full of cartoons ...