When you fit a dry sump, do you block up the hole where the standard oil pump used to sit?
I am using a local South Africa made pump and am getting 4 bar idle pressure with hot oil. Too scared to rev . Pipe work is set up exactly as per burton catalog.
theres no need or point in blocking the hole in the block.
the pump must have a pressure relief valve in it, sounds like it needs adjusting.
On the Pinto and NA Cosworth engines we built we never needed to block the standard oil pump off, only where it came out of the block to the oil filter and that was to stop any foreign bodies and shite going back into the sump.
Why are you frightened to rev the engine? 4 bar oil pressure does n't sound too bad to me on a Pinto. Some dry sump pumps had an adjustable relief valve, maybe you could try adjusting that for a little more pressure but to me what you have should be adequate.
4 bar at idle on hot oil is a lot though
How Hot is Hot? I have seen engines with 4bar idling on a warm engine then give it a good thrashing and at the end of a stage or race the oil will be like piss and the pressure will drop to 2 bar on idle. We had a Group A Escort with a Mountune built engine and that was exactly like i described.
i must admit i was thinking the same, if it hasnt been revved the oil cant be that hot.Originally Posted by Forest_rallying
i remember when i dry sumped my bmw m10/s14 engines compared to wet sumped the oil pressure stayed in a narrower range, they held pressure at low rpm better but didnt try to bend the gauge at high revs
It is indeed so, you can never have "hot" oil without loading the engine. It means, you need a rally stage or something similar. On my dyno, all engines have good oil pressure until the time I start loading and measuring the power. Then all engines drop in oil pressure at idle. Some even to very low numbers (and these are the one with too much clearances or oil pump too small).
Most dry-sump pumps offered for Pinto's are to small. If you do use a larger pump you can keep very high oil pressures at idle. I remember, when using old the KENT HC/HP pumps (larger body) I used to have very high oil pressure at idle. At least over 3-4bar. I'm currently using Melling pumps and still got good oil pressure hot but not so high. The one sold at Burton and all over the place are rubbish, oil pressure too low at lower revs and after a good dyno session they are already worn out.
At idle, most of the time the release valve is closed. Off course it has to be set to prevent over pressure. 5 bar is a good starting point for a Pinto and is so for most engines.
Thanks for all the info . I guess I will take it for run around the block and see what it does . I just trued a softer spring in the orb and the idle pressure has dropped to 3 bar.
I just tried a softer spring in the prv and the idle pressure is at 3 bar now.
Just done a few laps around the neighborhood. When starting the pressure was above 5 bar. As it heated up it started dropping. When it got hot I went to about 6000 revs and it was on around 4.5 bar . Idle went down to 2 bar . I might have to turn in the prv at the track . Feeling a lot more confident now. Does anyone run a pipe from the tappet over to crank breather, to get oil back to bottom or do you just blank the crank breather off?
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