nikpro Posted July 30, 2010 Posted July 30, 2010 Why Adam - they don't work! Ultima used to fit them to their Chevy engines and have seen more of them go pop with oil surge than anything else! If you have oil surge then look for another fix - the pre-oiling is just salesman's hype!
John Loudon - Sponsorship Liaison Posted July 30, 2010 Posted July 30, 2010 Nick Algar uses one on his Gould to quickly build oil pressure on startup with good effect. However, I am a bit reserved about whether they help prevent oil surge or not - have heard some bad and some good stories
Dave Eastwood (Gadgetman) Posted July 30, 2010 Posted July 30, 2010 It's bit second hand news I know, but IIRC a few of the Blatchatters had problems a while back. I think a lot of it may have been down to wrong spec units though. However, if surge is the issue, I'd have thought it better to address it directly; flappy paddle sump and additional baffling etc.
adamnreeves Posted July 30, 2010 Author Posted July 30, 2010 I am not experiencing oil surge on the road. I do have a Mulfab sump already which is baffled, trap doored, extra capacity, crank scrapping, etc. Like to think an accusump will provide an extra safety blanket for when I start doing track days. The main advantage is pre-oiling on engine start-up. When the engine has not been started for over a week you can hear the metallic noise for a few seconds.
John Loudon - Sponsorship Liaison Posted July 30, 2010 Posted July 30, 2010 To preoil and engine with one requires for the accusump to be able replenish after it has purged its contents into the oil system at startup. At some point a valve will have to be opened and closed to prevent the stored pressured oil from escaping at standstill. On Nick's Gould we do this with a manual lever whilst stood next to the engine whilst he cranks it over but that will be awkward for an ordinary road car. I think there is a solenoid operated version that may do what you need
nikpro Posted July 30, 2010 Posted July 30, 2010 It's the necessity to pre-oil on an normal road engine that I doubt. I've stripped several engines that have been sat in breakers yards for over a year and oil is still retained on bearing surfaces. Bores will not be lubricated fully until the engine is actually running.
adamnreeves Posted July 30, 2010 Author Posted July 30, 2010 At some point a valve will have to be opened and closed to prevent the stored pressured oil from escaping at standstill. I was looking at the electronically operated EPC valve which does exactly this I believe.
adamnreeves Posted July 30, 2010 Author Posted July 30, 2010 It's the necessity to pre-oil on an normal road engine that I doubt.I've stripped several engines that have been sat in breakers yards for over a year and oil is still retained on bearing surfaces. Bores will not be lubricated fully until the engine is actually running. Yeah but lets face it the RV8 is over 50years old and the tolerances were dreadful back then. My brand new engine clatters an awful lot when it first fires up. After a few seconds it sounds normal but begs the question what's suffering? I have Rhoad bleed down lifters installed so the noise maybe from them until oil is pressurized enough. The noise is certainly not from the bottom end. Anyway, anyone that as an accusump having read this decided that they do not need it anymore
nikpro Posted July 30, 2010 Posted July 30, 2010 It's the necessity to pre-oil on an normal road engine that I doubt.I've stripped several engines that have been sat in breakers yards for over a year and oil is still retained on bearing surfaces. Bores will not be lubricated fully until the engine is actually running. Yeah but lets face it the RV8 is over 50years old and the tolerances were dreadful back then. My brand new engine clatters an awful lot when it first fires up. After a few seconds it sounds normal but begs the question what's suffering? I have Rhoad bleed down lifters installed so the noise maybe from them until oil is pressurized enough. The noise is certainly not from the bottom end. Anyway, anyone that as an accusump having read this decided that they do not need it anymore <!--emo& The 'clatter' will be the lifters Adam - nothing to worry about; it actually helps on start up! (stops the cam lobe seeing high load on start) The pre-oiling won't help much as it will only pressurize certain lifters; the ones that have their groove in line with the oil way at the pre-oil stage. The Accusump just adds weight and complication.
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