Blown Viper Motor. Diesel fuel.

[Sasquatch]

I look at the cylinder (which is toast as well as the piston) and I see no evidence of a failed gasket! Turbo is always under pressure so the gasket would have to be gone bad to let water in but if it did it would also let pressure out. I've seen what happens when gasket fails and cylinder pressure goes out, it cuts the aluminum head and or the block. I don't see that here!

In the end the motor needs a new block that one is gone! If Yamaha does not stand behind a turbo they endorse it does not look good on them. These Vipers are full of a Mildred of problems that make the Yamaha name leave a bad taste in your Mouth. I know I would never buy one in a million years (heck I would buy a Nytro first and I don't like the Nytro). It (Viper) is just not a Yamaha! To many cooks spoil the broth!

As my buddy says you can put a Cummings in a Dodge but that don't make it a Cummings!

 

[corey miskolczi]

There are boosted nytros in british columbia with 15000 miles with no trouble. All i can say is u should not have a boosted sled wot for a long duration of time.

 

[Rev-it]

Boosted NYTRO that is why I bought the viper I assumed it was the same set up in a cat body. You know what assumed does. So you only climb little hills?

 

[fc8464]

I am suprised Yamaha is not jumping through hoops to make this right. Once they confirm its there endorced turbo set to there specs. Every manufacture are going to have failures and you have to bite the bullit and do what you can to make the customer happy. Other wise it ends up on forums and makes people thing that Yamaha is slipping and not the best choice. Just my 2 cents. Fred

 

[Rev-it]

I am going to regret this later but i will play your game.
How long is ok?
1 min?
2 min?
How long at full throttle in a long chute?
At 100mph it is less then a min,
Less then 45 seconds for a mile.
I'm not even going to tell you a story of a turbo sled of a different brand that runs from one end of this lake to the other just to see how fast he can do it. And btw he destroys the nytros.
Point is we have many boosted nytros here and they all lake race to see how fast they are and the lake is 10 miles long. That is why i bought the viper and not just boosting my Nytro. So I don't buy it that a boosted viper has to be driven so differently then all others out there.

 

[Rev-it]

And

I look at the cylinder (which is toast as well as the piston) and I see no evidence of a failed gasket! Turbo is always under pressure so the gasket would have to be gone bad to let water in but if it did it would also let pressure out. I've seen what happens when gasket fails and cylinder pressure goes out, it cuts the aluminum head and or the block. I don't see that here!

In the end the motor needs a new block that one is gone! If Yamaha does not stand behind a turbo they endorse it does not look good on them. These Vipers are full of a Mildred of problems that make the Yamaha name leave a bad taste in your Mouth. I know I would never buy one in a million years (heck I would buy a Nytro first and I don't like the Nytro). It (Viper) is just not a Yamaha! To many cooks spoil the broth!

As my buddy says you can put a Cummings in a Dodge but that don't make it a Cummings!

And believe me he poked fun at my Nytro every time he could. Lol

 

[Studroes144]

Unless it's strictly a mountain sled running high elevation, how can anyone hold these things wide open for 1-2 minutes, my turbo viper is at 105-110 mph in 10 seconds, why in gods name are people holding turbo sleds at wot for miles across a lake? Anyone can say that it "should" hold up on long runs, but what's everyone's reasoning of why it should hold up? Cuz we want it to? Long wot runs cause the intake to keep getting hotter and hotter, and without an innercooler there's nothing cooling that air down, and hot intake charges temps can be the death of a boosted sled, especially a high compression engine like the viper with the aggressive ecu setup.

 

[Mountaintech]

There are boosted nytros in british columbia with 15000 miles with no trouble. All i can say is u should not have a boosted sled wot for a long duration of time.

Your first statement is correct, but I do not agree with the second one. A properly engineered system has no problem dealing with WOT for extended periods of time. Ask MPI what the design criteria for their system was from Yamaha.

 

[scott32]

Dip your tamk and get an independent octane test done by someone with credentials. If the fuel is good then go back your dealer with the results and kick out there last leg and watch them squirm. If the fuel in turn is not then this thread is mute. Also, with a properly tuned turbo you should be able to pin it in B.C. and let off at the ON./QE border and coast to NFLD and be fine. I'm surpised Matt hasn't jioned in here yet, probally busy, but he is now fully invested in and with Yamaha so he will likely speak carefully of the matter. I wonder how much damge was already done when you puked you oil out. This is likely why Matt and Yamaha are working to meet EPA standards for a factory installed turbo, to take away the dealer error/cost on installs. Cat is also competing for this turbo bid , as rumor has it.

 

[Tricky Nick]

All this talk about no long WOT runs doesn't seem right. looks like MPI tested for long WOT runs at or near sea level already.

http://www.ty4stroke.com/threads/a-little-different-dyno-test-with-mpi-turbo-viper.129472/

 

[fbkakrdr]

Looks like detonation caused by a lean cylinder, either a faulty injector or low fuel pressure at the end of the fuel rail (if this is the furthest injector from the feed side of the fuel rail). If it was bad fuel I would expect to see at least some detonation scars on the other pistons. Looks like the majority of detonation was initiated on the lower left exhaust valve in the pic.

 

[Rev-it]

Mag cylinder, exhaust side under the valve closer to the middle cylinder. The other two look mint. Don't know where the fuel rail is fed from.

 

[Srxspec]

Fuel rail is fed from the mag side.

 

[Studroes144]

Just out of curiousity, how was the clutching setup on the sled, what rpm were you running at wot? On the sled in the test video I can about guarantee they are holding that engine steady at 9000 rpm, honestly that's the safest spot for the engine to run, there's less cylinder pressure and they're pulling timing at bit, if you're lugging your rpm along at 8000, 8200, 8400 and building up rpm your pulling the same boost, having way more cylinder pressure, and your timing is in a very hot stage at that point, all things that can be the death of a boosted engine. Everyone is so nervous about the rev limiter on this sled, the rev limiter is much safer than under revving. Not saying that's what went in here, but it's something to consider for all turbo guys, let the engine rev high and quick, it's much safer.

 

[Extreem]

18 K ? Man I feel for ya......