Discussion
I suspect that the goal is to have pressurised oil upon startup so that there is no startup clatter and possibly less wear upon starting. The old "50% of engine wear happens in the first 10 seconds after starting" chestnut, however true it is, or was.
I don't think that there is much of an advantage on a car that's not in daily use, but it's not my car. If it were, and I were concerned about these things, then I'd engineer a way of disabling the ignition, via a separate switch. Then you can crank the starter to get the oil pressure up, once it's pressurised you can switch on the ignition and off it goes. Doing it this way would be very cheap.
I don't think that there is much of an advantage on a car that's not in daily use, but it's not my car. If it were, and I were concerned about these things, then I'd engineer a way of disabling the ignition, via a separate switch. Then you can crank the starter to get the oil pressure up, once it's pressurised you can switch on the ignition and off it goes. Doing it this way would be very cheap.
Read the post by RH on this thread... here's why it doesn't work well.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I'd save the £500 and put it towards a rebuild when the followers, cams, or guides fail.
http://www.pistonheads.com/gassing/topic.asp?h=0&a...
I'd save the £500 and put it towards a rebuild when the followers, cams, or guides fail.
plasticman said:
The slower the engine is turning the greater the forces on the camshaft.
How so? It's at odds with intuition which would say there is no engine load and with observations. IME when you do an oil change (on any car) and fire the engine up normally with the fresh oil, there is invariably a godawful clattering until the oil pressure returns. Do the same with a coil lead off, no clattering, oil light goes out, reconnent and start without noise. Now OK, some of this noise will be big ends taking up the slack, but we all know that most startup rattles are cam followers pumping up and similar top end stuff.battered said:
How so? It's at odds with intuition which would say there is no engine load and with observations. IME when you do an oil change (on any car) and fire the engine up normally with the fresh oil, there is invariably a godawful clattering until the oil pressure returns. Do the same with a coil lead off, no clattering, oil light goes out, reconnent and start without noise. Now OK, some of this noise will be big ends taking up the slack, but we all know that most startup rattles are cam followers pumping up and similar top end stuff.
Contact load of the cam nose falls with increased rpm. Hence why you don't run a cam in at idle or turnover rpm. Edited by m4tti on Sunday 29th January 11:07
If your interested here's a decent explanation of it in about as plain English as I've found..
http://www.pugheaven.co.uk/CAMSHAFT%20FITTING.htm
http://www.pugheaven.co.uk/CAMSHAFT%20FITTING.htm
I have the race proved pre oiler system on my Tuscan it automatically delays engine cranking for a period of time to build up some oil pressure in the system it has two small tubes set in the cam cover which squirt oil onto the cam lobes If you want to discuss it further pm me with your tel number
Ian
Ian
I have the race proved pre oiler system on my Tuscan it automatically delays engine cranking for a period of time to build up some oil pressure in the system it has two small tubes set in the cam cover which squirt oil onto the cam lobes If you want to discuss it further pm me with your tel number
Ian
Ian
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