|
Post by efiste2 on Feb 1, 2013 20:03:02 GMT 1
Just trying to get my head around the principle of the FORD VCT principle of the engine in my focus.....the Variable Cam Timing is acheived by the cam pulleys being variable in its connection to the cam, and the adjustment is my means of oil being pumped into advance and retard chambers on the adjustable pulleys....hence altering the performance of the engine....thats what I have gained from watching a video on YouTube. Am i correct in thinking that this can be compared to a sort constantly changing vernier cam pulley set-up, but instead of LOCKING the vernier pulley in place, oil under pressure does the job ? the big question id like to ask the experienced chaps is, with OIL under pressure being used as the adjustment ie. the oil under pressure is stopping the cam/pulley connection returning to its "start-up" setting, what stop the oil being "reversed" so to speak and flowing back into the control solenoid....or how does the oil under pressure keep the pulley connected to the cam in the same position...if that makes any sense whatsoever I know PRESSURE must be the answer but to equal that of a bolted connection between cam and pulley that must be a good pressure, ie to overcome spring pressure of the cam etc etc........Im guessing that the same sort of principal can be compared to a hydraulic tappet from a trusty CVH engine...
|
|
|
Post by Karl on Feb 2, 2013 14:53:41 GMT 1
.
|
|
|
Post by Karl on Feb 2, 2013 14:54:46 GMT 1
.
|
|
|
Post by Karl on Feb 2, 2013 15:02:08 GMT 1
.
|
|
|
Post by Karl on Feb 2, 2013 15:15:05 GMT 1
.
|
|
|
Post by Karl on Feb 2, 2013 15:48:34 GMT 1
.
|
|
|
Post by efiste2 on Feb 2, 2013 16:12:10 GMT 1
Thanks so much for the replies guys, makes a lot more sense to me now, not that ill ever mess with it i just like to know the "basic" operation. would this system benefit from an oil flush every so often. its due its oil service in 200 miles or so and it will be changed every 6k. as you guys have pointed out to me this system relies on very small bore oilways to maintain perfromance......its the first oil change I will have done on the car and I have noticed the oil gets blacker quicker than my old car.......Once again chaps the info and effort is much appreciated....
|
|
|
Post by Monkey on Feb 2, 2013 21:19:35 GMT 1
I wouldn't recommend an oil flush, just change the oil regularly!
|
|
|
Post by efiste2 on Feb 2, 2013 22:27:15 GMT 1
Great advice thanks, I got the idea from an article in CM mag traders diary who says they always oil flush his cars to sell on......and give the engine "a new lease of life " However you guys just back up what i believe, that regular quality oil services are the best way to keep an engine in good health.
|
|
|
Post by Rhubarb on Feb 3, 2013 1:07:58 GMT 1
Great advice thanks, I got the idea from an article in CM mag traders diary who says they always oil flush his cars to sell on......and give the engine "a new lease of life " However you guys just back up what i believe, that regular quality oil services are the best way to keep an engine in good health. Modern oils have lots of additives in them, so regular oil changes is all that's required Engine flushes can do more harm than good
|
|
|
Post by Karl on Feb 3, 2013 20:35:20 GMT 1
Great advice thanks, I got the idea from an article in CM mag traders diary who says they always oil flush his cars to sell on......and give the engine "a new lease of life " However you guys just back up what i believe, that regular quality oil services are the best way to keep an engine in good health. Modern oils have lots of additives in them, so regular oil changes is all that's required Engine flushes can do more harm than good Funny story Last time I've seen any use a engine flush , they used a half litre of fluid from the parts cleaner machine!!!!!!! It was a diesel Mondeo Which ran for all of 5 mins before it seized up
|
|
|
Post by wheelnut on Feb 4, 2013 1:52:00 GMT 1
... an article in CM mag traders diary who says they always oil flush his cars to sell on....... The author of that was a member on the other site, did he join up here? An old method of flushing around here (in the days of the Kent engine) was to drain about half the old oil, top it up to MAX with diesel fuel, run for about ten minutes then drain the lot. Anyone like to try that on variable cams and let us know how it goes?
|
|
|
Post by efiste2 on Feb 4, 2013 23:59:25 GMT 1
I think ill try that, sounds like a great idea.......do you think it would invalidate the warranty....
|
|
|
Post by Karl on Feb 5, 2013 0:12:58 GMT 1
I think ill try that, sounds like a great idea.......do you think it would invalidate the warranty.... It's not a good idea Do not use any sort of flushing product as you've already been told !
|
|
|
Post by efiste2 on Feb 5, 2013 20:57:07 GMT 1
sorry Mr B that was my attempt at humour I do take the advice you guys give seriousley and its most appreciated....
|
|