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Author Topic: MTDi pump goes strange  (Read 7088 times)

Reply #15August 02, 2012, 12:06:33 am

8v-of-fury

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Re: MTDi pump goes strange
« Reply #15 on: August 02, 2012, 12:06:33 am »
Quote from: Hagar
"Pressure in pump MUST be 43.5 Psi at 1000 RPM engine "
"Pressure at 2000 Rpm -about 75.4 Psi"

Reply #16August 03, 2012, 06:30:48 pm

snakemaster

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Re: MTDi pump goes strange
« Reply #16 on: August 03, 2012, 06:30:48 pm »
tryed on a aaz pump 45psi at 1000 engine rpm , and on 3 of my M tdis are all 80ish psi at 1000 engine rpm 2 off the pumps are built from landrover 200 tdi pumps all parts swaped over and rebuilt the same spec + gov mod and lda , i have a range rover tdi stock one so i will put the gauge on it and see what it reads  .

i have put biger injectors in one of the M tdis .216 and will change the PRV so i get 45psi at 1000 rpm and see how she goes
Glenmorangie  single highland malt

Reply #17August 08, 2012, 10:19:10 am

snakemaster

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Re: MTDi pump goes strange
« Reply #17 on: August 08, 2012, 10:19:10 am »
GOT it down to 50psi at 1000 engine rpm and biger injectors and no difrance 3000-3500rpm when it cuts on to 3 ,120psi on the pump when she cuts on to 3 , ??? any thoughts what could be causing this
Glenmorangie  single highland malt

Reply #18September 04, 2012, 05:38:53 pm

snakemaster

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Re: MTDi pump goes strange
« Reply #18 on: September 04, 2012, 05:38:53 pm »
i stuck in a nother set of injectors with bigger nozzles and it dont cut down to 3 untill higher up the rev range ,so its a bit beter, just thinking could i be over pressurizing the injectors , so making tham stay open a little ,190bar thay are, this would explain the smoke from the exhaust when it goes on to 3 and 2 cylinders  , dose this make sense
Glenmorangie  single highland malt

Reply #19September 30, 2012, 12:02:29 pm

QuickTD

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Re: MTDi pump goes strange
« Reply #19 on: September 30, 2012, 12:02:29 pm »
Weak valve springs, improper lifters, high boost and high oil pressure can cause this. High boost and rpm help to float the valve and high oil pressure overextends the lifters. This holds the valves open causing misfire and huge white smoke. Recovery takes several seconds at low rpm My TD would do this in the cold (80psi oil pressure) at high boost and revs, car would stall completely and not restart until the lifters bled down, 1 minute or so. Scary the first time it happened.

Make sure you are using correct lifters for the valve springs. Older 8mm stem dual spring heads used different lifters than newer single spring, 7mm stem heads. Old lifters will pump up easily with single springs.

Reply #20October 02, 2012, 05:49:46 pm

snakemaster

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Re: MTDi pump goes strange
« Reply #20 on: October 02, 2012, 05:49:46 pm »
Weak valve springs, improper lifters, high boost and high oil pressure can cause this. High boost and rpm help to float the valve and high oil pressure overextends the lifters. This holds the valves open causing misfire and huge white smoke. Recovery takes several seconds at low rpm My TD would do this in the cold (80psi oil pressure) at high boost and revs, car would stall completely and not restart until the lifters bled down, 1 minute or so. Scary the first time it happened.

Make sure you are using correct lifters for the valve springs. Older 8mm stem dual spring heads used different lifters than newer single spring, 7mm stem heads. Old lifters will pump up easily with single springs.

nice one ,i will look in to this  ;)
Glenmorangie  single highland malt