VRO Testing, Pulse Limiter

[lowbud]

I have been having trouble with my wot on a 1985 Johnson 150 thinking it might be something with the VRO...<br /><br />I installed a pulse limiter as recommended by some of the articles mentioned on this forum. Does the blue face go towards the VRO? <br /><br />The pulse limiter I installed had a nipple on each side. When I installed it, my new hose section got a little squished, not a lot. Is that going to be a big deal?<br /><br />I hooked up a clear vinyl hose to the output of the VRO with a pressure gauge to monitor the performance of the pump. The OMC service manual stated that I would see the oil injected into the gas. I could not identify any signs of oil going into the gas. Would I be able to see that at the 150:1 when idling? <br /><br />The pressure was about 4 psi then gradually dropped to about 2 psi when the pump clicked (oil injected?) then dropped to zero. This was at idle speed of around 1800 rpm on muffs. Then back up to 4 psi. Even though this was at idle speed does it sound correct?<br /><br />While playing with the VRO my idle speed dropped to 1000 rpm. I lost spark on one side of the V-6. I tapped on the power pack and vroom, all were firing again. Another tap and lost them. I have a new power pack on order. I hope this is my problem with the wot bogging.<br /><br />Any help with the above questions would be greatly appreciated.

 

[OBJ]

Re: VRO Testing, Pulse Limiter

Hey lowbud.....<br /><br />Blue faces the pump.<br /><br />Just how old is the pump? Is there 3 wires in the harness or four?<br /><br />Best way to determine if the pump is working (putting oil in the gas) is to mix your fuel tank(s) at 50:1 and put marks on the oil tank. Run a tank of premix and see if the level in the reservoir has dropped....(hash marks on the oil tank).<br /><br />The pump should not mix anything below 50:1....150:1 don't exist......typo?

 

[seahorse5]

Re: VRO Testing, Pulse Limiter

The oil consumption test, that is described in the service manual, says to use a 1/4" clear hose at the oil inlet fitting and fill it with oil. Then mark off 1" increments with a Magic Marker. Run the motor and you will see the oil level drop when the pump pulses. The specs are in the factory manual.<br /><br />The amount of oil per pulse will vary with rpm and throttle setting.

 

[lowbud]

Re: VRO Testing, Pulse Limiter

Thanks for the info. Okay, I installed the blue side to the pump. I thought at idle the fuel to oil ratio was 150:1 to prevent fouling the plugs at low rpm.<br /><br />I totally forgot about that clear hose test on the oil side. I must of got distracted when the power pack acted up. That test should do the trick. I normally add oil to the reservoir every year so it has to go somewhere but that test will tell me if in the right amounts.