Viper is within . 21 mph of hitting 80

**Bodhi** · 12-15-2020, 07:39 AM

Sounds great! Can't believe how high the nose runs with that cleaver. Like Insano said, make a pass with some ripple in the water and it'll be faster

**Da Bull** · 12-15-2020, 08:23 AM

I wish that 115 had enough steam to plane the SSM. Maybe a smaller prop if anybody has one to loan. That SSM is so efficient it just locks the prop up to the water.

**half fast** · 12-15-2020, 08:50 AM

Maybe some sort of vent tube to break the prop loose , like the mc # 6 drives. Just rig up something temp for testing. hf...

**JUPITER PULSARE** · 12-15-2020, 09:43 AM

Skip dinner and breakfast, throw on a pair of speedos, lose the t-shirt, shave your chest hair and head and go out on a cool morning! You got this Charlie!

**Capt.Insane-o** · 12-15-2020, 10:23 AM

Originally Posted by half fast

Maybe some sort of vent tube to break the prop loose , like the mc # 6 drives. Just rig up something temp for testing. hf...

Yeah this...running the 12 inch takes away the exhaust relief that those little motors need to buzz the prop.

**FUJIMO** · 12-15-2020, 11:11 AM

...whats the gear ratio on that particular mc1?... a number of them were 1.5:1...

**rock** · 12-15-2020, 11:23 AM

My 150xs T2 with the speedmaster has a hell of a time breaking loose so I imagine with a 115 it's a similar issue. The previous owner added nitrous just to get off the line. I have thought maybe a some type of vent such as half fast has suggested but have not figured that out yet. You'll see 80 next time out. Good job.

Rock

**mrcrsr** · 12-15-2020, 01:13 PM

Originally Posted by half fast

Maybe some sort of vent tube to break the prop loose , like the mc # 6 drives. Just rig up something temp for testing. hf...

That's the next step is I'll jury rig an external vent hose along the cavitation plate and then up, and just wire tie it in place for testing. As far as the coned case and top end numbers, I'm going to fix some chips in the pad, and try it again, and if that doesn't do it I'll give it some more timing. T2X powerhead is getting built and put on the boat next week, so I'll try this engine one more time

**FMP** · 12-15-2020, 01:57 PM

Did you add any additive to the top shelf pump gas?
Less heat in it , slower burn, need more ign?
What fuel are you using?

**RONNIE** · 12-15-2020, 07:11 PM

put some race gas in it and turn the timing up more

**FMP** · 12-15-2020, 08:23 PM

Put the Wiseco high domes in it , give the ports some more, about halfway to 1500xs , build the proper tuner setup , 10/10 reed, set the carbs and jack the ign to 27° at cranking speed WOT, 25.5° at high rpm, NGK plugs, solid wires , feed the good fuel. No fear.
It's at 21 now, lazy 19.5° at rpm.

**rgsauger** · 12-15-2020, 10:01 PM

Originally Posted by XstreamVking

Rain X the bottom and the lower. You will see a 2 mph gain for about an hour.

Rain X??? Interesting

**David - WI** · 12-15-2020, 10:50 PM

Originally Posted by RONNIE

put some race gas in it and turn the timing up more

Yeah, 3 gallons of race gas is probably worth 1/4 mph versus 18 gallons of premium...100 pounds.

**NoRdO** · 12-15-2020, 11:12 PM

I'll catch hell for this and I'd never do it to my Viper

...remove windshield

**Capt.Insane-o** · 12-15-2020, 11:18 PM

Same XS powerhead would run 83 on my viper and 81 on my Vector. Both are close in weight but the viper manages air much better for natural bow lift.

If your running corn gas it is not going to tolerate timing..some rec 90 and 1/2 110 yes. A cooler morning with some ripple will get you there.