I have the same cam,, but try the advance at 10-12...
I thought the slow engine wind down was a pollution thing?
Hi everyone, I have a range rgover classic with 3.9 v8 rebuilt with a kent cam h 180 ... new oem stepper motor and I have no air leaks in the plenum chamber, rover pressure gauge has no fault code, my problem is in the gear shift, when the clutch is released with little gas the engine accelerates revolutions per minute 1200-1500, or stopping at an intersection before descending to 700 rpm takes about 3 seconds. I have setting the idle but i have a small difference... i have setting high timing ignotion 19° i think is the causes.... whow do you think?
I have the same cam,, but try the advance at 10-12...
I thought the slow engine wind down was a pollution thing?
"How long since you've visited The Good Oil?"
'93 V8 Rossi
'97 to '07. sold.
'01 V8 D2
'06 to 10. written off.
'03 4.6 V8 HSE D2a with Tornado ECM
'10 to '21
'16.5 RRS SDV8
'21 to Infinity and Beyond!
1988 Isuzu Bus. V10 15L NA Diesel
Home is where you park it..
[IMG][/IMG]
I hadn't thought about pollution, so it could be a characteristic of the cam
If the car is moving and foot off accelerator , the stepper motor will raise the revs to about 1200 until you stop.
The formula in the ECU is speed signal positive +Throttle position sensor less that 0.49 volts ( ie foot off accelerator) + revs less than 1500 then the stepper will raise revs to 1200.
It is primarily to give a smooth shift to 1 in an auto, but AFAIK they fitted it to manuals as well.
It is normal but exaggerated by your incredible static timing. Reduce the timing to 10degrees BTDC. You maybe should also check that the centrifugal advance is moving freely and maybe oil the shaft under the rotor if you haven't done so.
Regards Philip A
I can't keep the times at 10 ° because I would have no performance....the rotating masses are lubricated but compared to another distributor the springs are harder, could this be the cause?
When setting a distributor timing there are three settings to check
1 Initial timing.
2 Amount of timing advance when the revolutions are increased
3 Vacuum advance when the vacuum pot is given vacuum
You need a timing light with and advance dial to check a distributor properly and check all three settings
The other item to check is to ensure that o degrees is actually zero and the piton is at top dead center.
I am not sure of the specifications of a rover V8 distributor but most engines run something around 8 deg initiial and total advance of 36 deg
Vacuum advance can be around 8 degrees and vac advance was normally used on with automatic transmissions in the old days.
The advance weights in your distributor can become stuck or may have been set incorrectly. If you are lucky you may find someone with a distributor checking machine available in your area.
Sorry to confuse the issue.
Ian
Bittern
Thank you for your tips!
Yes. If you are needing to force the static timing to get performance your distributor is not working properly. You can determine the timing curve with a timing gun by increasing the engine speed.
Search AULRO.com ONLY! |
Search All the Web! |
---|
|
|
Bookmarks