| declanm |
| Total Posts: | 191 |
| Last Post: | 07-07-08 |
| User Since: | 04-08-08 |
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Posted: May-04-2008 07:29PM
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cstorey, you are probably right about the gearbox contributing to the crankcase pressure problem. Maybe those running without a windage tray will have more air mixed into the oil creating the mist your refer to.
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| Specalt |
| Total Posts: | 48 |
| Last Post: | 07-08-08 |
| User Since: | 03-26-08 |
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Posted: May-03-2008 07:36PM
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Thanks again for all the helpful info. (Insert snide comment here) 
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| CStorey |
| Total Posts: | 886 |
| Last Post: | 06-20-08 |
| User Since: | 10-25-02 |
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Posted: May-02-2008 01:26PM
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Q:cstorey, what is it about A-series engines which causes them to generate excessive crankcase pressures? A: I am not really sure , because it was not generally a problem with the in line A series. I think probably it is the fact that the 1275 were bigger bore and longer stroke than some of the others, which increases windage or pumping effects, coupled with the fact that the transverse gearbox, full of internals, immediately below the crank, exacerbated these effects, probably because the pumped air/fluid emulsion ( or mist as it is more usually called ) had nowhere to go . Also, of course, the geartrain in itself caused some degree of misting
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| declanm |
| Total Posts: | 191 |
| Last Post: | 07-07-08 |
| User Since: | 04-08-08 |
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Posted: May-02-2008 11:52AM
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cstorey, what is it about A-series engines which causes them to generate excessive crankcase pressures?
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| tvanderh |
| Total Posts: | 678 |
| Last Post: | 07-08-08 |
| User Since: | 08-21-05 |
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Posted: May-01-2008 07:03PM
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You will probably get a ton of answers as to what oil to run on 1275. I have heard lately to run Rotella 15w40 because it still has the needed additives that makes it safe to run on our flat tappet cam cars. I used to always run castrol, but have switched to the rotella. It must be good, it's being keeping diesels on the road for years. My Mini's are un-officially sponsored by Coor's brewing company.
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| Specalt |
| Total Posts: | 48 |
| Last Post: | 07-08-08 |
| User Since: | 03-26-08 |
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Posted: May-01-2008 09:39AM
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What viscosity of Oil would you guys recommend for a newer 1275? (Insert snide comment here)
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| mascherk |
| Total Posts: | 615 |
| Last Post: | 07-06-08 |
| User Since: | 08-08-02 |
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Posted: Apr-30-2008 03:20PM
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Try putting a bunge cord on your oil dip stick.
Cheers,
Kelley "If you can afford the car, you can afford the manual..."
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| Specalt |
| Total Posts: | 48 |
| Last Post: | 07-08-08 |
| User Since: | 03-26-08 |
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Posted: Apr-30-2008 11:50AM
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That makes total sence, when I put the motor back in the car I did it just like the 850, and that thing was bleeding oil so bad im sure the vents were put togeather to get oil up into the head. Thanks for the responces. (Insert snide comment here)
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| Spitz |
| Total Posts: | 6154 |
| Last Post: | 07-06-08 |
| User Since: | 01-22-03 |
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Posted: Apr-30-2008 11:17AM
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If you have 2 "vents" piped together....you really don't have even one vent...and if a tight fitting hose...then it's venting somewhere else causing your oil mess. A FATHER CARRIES PICTURES WHERE HIS MONEY USED TO BE 1130cc, 12g295, SW5 cam, LCB, HIF38, CA spec.
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| CStorey |
| Total Posts: | 886 |
| Last Post: | 06-20-08 |
| User Since: | 10-25-02 |
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Posted: Apr-30-2008 10:19AM
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The transverse A series engines are notorious for developing crankcase pressure. You need as much ventilation as possible. A breather from the rocker cover to the inlet manifold via a gulp valve helps a good deal, but you also need to have a vent from the top of the clutch cover which either can also be led to the gulp valve or, more usually and probably more usefully, vented to atmosphere or to a catch tank. If you look on this site at pictures of engine bays, you will see what is needed
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| Specalt |
| Total Posts: | 48 |
| Last Post: | 07-08-08 |
| User Since: | 03-26-08 |
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Posted: Apr-30-2008 10:09AM
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I do not have a problem with fumes, well ill say that but my wife won't. What I have is looks to be straight up oil. I do have 2 crank case vents that are attached together by one hose, Could this be the source of the pressure problem? I.e. one vent plugs into the other. with no venting to the atmosphere. (Insert snide comment here)
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| charrison |
| Total Posts: | 197 |
| Last Post: | 06-19-08 |
| User Since: | 09-11-00 |
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Posted: Apr-30-2008 09:58AM
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There will be one or more breathers on the engine to vent the crank case. These will probably be the source of the fumes.
However, you need to find out why you have high crankcase pressure - presumably piston blow-by, ie knackered piston rings. Have you done a compression test ?.
If all is OK, you could pipe the fumes away to under the car.
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| Specalt |
| Total Posts: | 48 |
| Last Post: | 07-08-08 |
| User Since: | 03-26-08 |
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Posted: Apr-30-2008 09:43AM
 Edited: Apr-30-2008 09:45AM
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I need a little help with what I think might be an oil pressure problem.I bought a rebuilt 1275 to replace my 850. After I ran the motor for some 200 miles or so my engine bay was covered in a light mist of oil. After reading a few mini tuning books I found the oil pressure spring and cut the last few rings off the spring and got my oil pressure down to about 70 psi from 80 psi.I have cleaned out the engine bay and again after about 200 miles it is coated in oil again. My question to all of you is:
1) Is there some thing else I should be looking at? 2) What is a good oil pressure to run a 1275 at? 3) Is there any other way to lower the oil pressure other than the oil pressure spring? Thanks Spec. (Insert snide comment here)
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