Viper to nytro oil tank swap.

[Martens199]

Hey guys, I have seen guys going back to a nytro oil tank on their new viper sleds. Wondering if anyone has attempted this on this page? If so how hard was it, and is it helping with the oil problems.

 

[HighSpeedLowDrag]

The Apex tank dosen't leak when you tip the sled.

 

[Tricky Nick]

Hey guys, I have seen guys going back to a nytro oil tank on their new viper sleds. Wondering if anyone has attempted this on this page? If so how hard was it, and is it helping with the oil problems.

I see from your sig that you are running a MCX turbo, have you tried running the return line from the breather box over to the mag side of the engine (MPI update) instead of back to the oil tank like it is stock. After I did the up date I have lost zero oil out the breather and I've had it upside down plenty of times. Are you running with a roll over valve.

 

[Martens199]

Yeah my breather box is in its stock location the mag is where my turbo return line is feed into. Not sure if it's possible to do it with a MCX kit. Mpi kit moves the box to the other side of the sled. I do have a roll over valve. That seems to work fine, it's more so the problem with the sled loosing its oil prime, and the oil light coming on. This is my main problem.

 

[yamahaguy]

There is 2 holes in the mag cover, you're using both or just the largest one in the center?

 

[Tricky Nick]

That seems to work fine, it's more so the problem with the sled loosing its oil prime, and the oil light coming on. This is my main problem.

Oh gotcha, yeah I feel your pain. I find the best way to reprime the oil pump after the sled sits upside down for some time is to point the nose down hill at a good angle before restarting the engine which can be a PITA. You can see that the oil pickup hose coming off the bottom of the oil tank actually travels forward and up into the mag side of the engine which is a poor design in my opinion. I've had my oil light come on while doing a wheelie up a steep hill at WOT and it kind of scares me

 

[yamahaguy]

I agree with Nick and point it down hill if you can.

 

[Martens199]

Yeah Nick I have the same problems, once i get the sled level I can get it to reprime easy with the 4 stroke solutions ROV prime button. But the problem is climbing hills and the oil light coming on, and when your stuck at the top of a hill upside down and on a vertical slope its a real piss off to try to get the sled in a position where the oil light will go out!! I have just been giving up and tossing the sled down the hill. lol
With the nytro tank you can mount the tank higher and the feed tube is set up a lot better.
Its sad that I'm missing my problem free nytro....

 

[Martens199]

There is 2 holes in the mag cover, you're using both or just the largest one in the center?

It used the smaller hole on the mag for return.

 

[Mountaintech]

Oh gotcha, yeah I feel your pain. I find the best way to reprime the oil pump after the sled sits upside down for some time is to point the nose down hill at a good angle before restarting the engine which can be a PITA. You can see that the oil pickup hose coming off the bottom of the oil tank actually travels forward and up into the mag side of the engine which is a poor design in my opinion. I've had my oil light come on while doing a wheelie up a steep hill at WOT and it kind of scares me

If your oil light comes on at WOT (because of actual low oil pressure.....less than 10 PSI), it is the perfect recipe for taking out a con rod bearing.

 

[Tricky Nick]

^ You don't say. Hint my concern. It's only done it once (that I have noticed) but given the position of the oil pick up line comming off the bottom of the oil tank it is perfectly plausible that when the sled is vertical that the engine could suck in air

 

[Mountaintech]

I understand why it is happening. Pinholes in Nytro filters have taken engines out for the same reason. Other parts of the engine can endure lower oil pressure at higher rpms but because the con rod bearing is orbiting and rotating at the same time, it fails very quickly in these circumstances. The next sign will be a slight knocking sound, followed by an eventual hole in the block. Usually it is the center rod that lets go. There is someone working on an aftermarket oil tank for the Viper.

 

[Martens199]

I understand why it is happening. Pinholes in Nytro filters have taken engines out for the same reason. Other parts of the engine can endure lower oil pressure at higher rpms but because the con rod bearing is orbiting and rotating at the same time, it fails very quickly in these circumstances. The next sign will be a slight knocking sound, followed by an eventual hole in the block. Usually it is the center rod that lets go. There is someone working on an aftermarket oil tank for the Viper.

Well I will be at his door waiting if the new tank works. Do you know who was building the tank?

 

[Mountaintech]

I do. Best to contact Rick at OFT Racing for info. I am not sure what the status of the tank is.

 

[Tricky Nick]

Bringing this topic back up. I been thinking of adding a belt drive to my sled and getting rid of all that rotating mass in the chain case. I've been talking to Tom at TKI and they have a belt drive system but are still working on the oil tank due to the loss of oil pressure on steep climbs as mentioned above. So I'm hoping this might be the answer to the problem. OFT and TS Fabrication HD Oil Tank. I'll ether try mounting it in the stock location after getting rid of the stock tank or I was thinking of trying to mount it in the empty space in font of the engine therefore the oil pick up hose will be running towards the engine during a climb

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