I'm building an Indy Lights engine for vintage road racing and have a query on the rocker shaft oiling. I know it needs an external hose to each rocker shaft - I think some other Stage 2s also use this method - but I'm not sure of some of the details.
First pic - the -10 hose is the main oil feed from the external Cosworth pump - is the -3 fitment next to it tapped into an oil gallery? I assume it is and obviously this then feeds the -3 fitting on the rocker cover. (The -3 hose shown is just loosely installed to help make the picture clear.)
Second pic - at the rear the engine came with two small hose fittings - a -3 on the side of the boss on the block and the -4 on top into a -10 adapter. Again I assume that boss on the block is an oil gallery. And if it's similar to the front the -3 hose will feed the other rocker shaft. But can anyone think what the other hose, the -4, might be for? I will need a feed for electric pressure senders (oil gauge, oil light and fuel pump safety switch) but a -3 would be more than adequate for that.
So my questions are -
1 - can you experts confirm that those locations on the block are in fact oil galleries?
2 - does using a -3 hose seem adequate for feeding oil to the rocker shafts?
3 - any ideas what the -4 hose might be for?
Thx - Derek
First pic - the -10 hose is the main oil feed from the external Cosworth pump - is the -3 fitment next to it tapped into an oil gallery? I assume it is and obviously this then feeds the -3 fitting on the rocker cover. (The -3 hose shown is just loosely installed to help make the picture clear.)
Second pic - at the rear the engine came with two small hose fittings - a -3 on the side of the boss on the block and the -4 on top into a -10 adapter. Again I assume that boss on the block is an oil gallery. And if it's similar to the front the -3 hose will feed the other rocker shaft. But can anyone think what the other hose, the -4, might be for? I will need a feed for electric pressure senders (oil gauge, oil light and fuel pump safety switch) but a -3 would be more than adequate for that.
So my questions are -
1 - can you experts confirm that those locations on the block are in fact oil galleries?
2 - does using a -3 hose seem adequate for feeding oil to the rocker shafts?
3 - any ideas what the -4 hose might be for?
Thx - Derek