1984 VF750F Oil mod

I have been reading everything I can with regards to the oil mod for these engines, on this forum and others. A quick question for those who have had these engines apart: Why can't I just tee off from the oil pressure switch port to supply the cams? I assume there is not enough volume available at that point, is that correct?
Thanks
Steve

 

I really thing for two reasons volume and once you start pulling oil from this port the oil light may never go out. does that make sence?
get a hold of jamie at Daughtry motorsports he is UBER smart about these bikes

 

There's someone on eBay right now offering the adaptor that goes under the oil filter. You would have to source your own lines, fittings etc but from what I know of the system that is the big item.

 

I am most likely wrong on this but cam and crank failures are a split.....first hand knowledge...not sure I would rob from one to supply another willy nilly.Check oil pressure and inspect pump for wear and decide from that point? Just saying at the age of gen1 it is best to be careful with a bike that is still running.

 

I tend to agree here. I have seen both failures first hand! I'm SO glad I have another engine for parts!

The engine on my bike now suffered a rod bearing failure. I grabbed the crank and bearings out of the other engine to get it going again. That engine was the original engine for the bike, and had the dreaded cam lobe failure. At least I can get the valve out of it that I need to get going again!

 

I would rather have a top end failure than rod or main failure every day and twice on sunday.

 

what about drilling a hole in the oil case, running a line or 2 to an auxiliary oil tank with a cooler maybe increase the capacity by a quart or 2. and a small electric pump to feed a little more to the cams?

 

The oil pressure switch port is not necessarily a bad way to go, but you really need to be careful. The main oil gallery modification is what the HRC race bikes used back in the 80's to supply the oil feed to the heads. While that's enough for me, it's not for others - I understand that. The oil switch port is connected to the same location as where the main oil gallery modifications taps into. That means the source of pressure and volume is close.

I've got an oil supply setup on one of my VF1000's that comes from the switch port. It's been on there for a couple of years now without any problems. That said, I've not really put a whole lot of miles on that bike. As with any top end oiling system, you must check to ensure that you are getting decent oil pressure without sacrificing bottom end pressure. As mentioned, the top end doesn't need as much as the crank, so anything you do should not jeopardize the supply to the bottom end. When I work on an oil mod system I use lots of gauges with notes of before and after, including hot and cold conditions. It's not easy, but to ensure it's right you have to put in some effort. I think it's worth it!

 

well if you tapped into somewhere that had no pressure at all and ran the other tank and an electric motor it shouldnt change your oil pressure and if its at the same level then it wouldnt starve out other locations. where do you get the kits for it though.