cloudy
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| posted on 15/7/09 at 07:21 PM |
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How bad is this oil surge?
I'm in the process of making a baffled sump, but not sure it'll be ready for a trackday on saturday...
I've just fitted R888's and the level of grip has made me worried about oil surge, particulary under braking. I've just taken a warm R4
round the block through some twisties. The drops in the graph are brake tests from 60 to zero. I think the dip on the far right is a drop to idle,
though i'm not 100% sure. I know the graph isn't ideal - but am I likely to do damage driving the track day like this?
 
Rescued attachment surge.png
www.warnercars.com
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mookaloid
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| posted on 15/7/09 at 07:26 PM |
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are you likely to lots of braking from 60 to zero on a track day?
perhaps do the test without these brake tests and see if the pressure drops as much?
"That thing you're thinking - it wont be that."
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cloudy
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| posted on 15/7/09 at 07:27 PM |
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perhaps not to a stop, but heavy braking is heavy braking, I can't do 100>50 on the road can I 
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locoR1
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| posted on 15/7/09 at 07:37 PM |
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Have you done a sensible drive to compare the graphs?
Could be just normal oil pressure fluctuation due to change of engine rpm
 
Description
Check out my CB500T Cafe Racer build diary
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mookaloid
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| posted on 15/7/09 at 07:42 PM |
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quote:
Originally posted by cloudy
perhaps not to a stop, but heavy braking is heavy braking, I can't do 100>50 on the road can I
Ok fair point - is that a minimum of 38 psi?
If so it doesn't seem too bad to me.
I think the main problems with oil surge are when you lose pressure on a long corner with the engine under load, which doesn't seem to be
happening here
Cheers
Mark
"That thing you're thinking - it wont be that."
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cloudy
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| posted on 15/7/09 at 07:44 PM |
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"a sensible drive" not familiar with this terminology? 
Here's another run before tyre swap, two drops I know equate to medium braking for two corners
 
Rescued attachment surge2.png
www.warnercars.com
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locoR1
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| posted on 15/7/09 at 07:49 PM |
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quote:
Originally posted by cloudy
"a sensible drive" not familiar with this terminology?
Here's another run before tyre swap, two drops I know equate to medium braking for two corners
I half expected that reply
looks ok to me but as said by mookaloid its your long fast corners that are the real engine killers!
Description
Check out my CB500T Cafe Racer build diary
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cloudy
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| posted on 15/7/09 at 07:58 PM |
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Will try and find some big roundabouts! I'm getting the feeling that it'll probably be ok for a few sprints until I make and fit a
baffle...
James
www.warnercars.com
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mark chandler
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| posted on 15/7/09 at 08:09 PM |
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Can you not graph with respect to RPM, you can then see if its an issue.
Regards Mark
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s2gse
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| posted on 15/7/09 at 08:15 PM |
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how are you doing the graph what program are you using to get oil pressure info
life's to short and so was the drive
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cloudy
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| posted on 15/7/09 at 08:17 PM |
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To answer both posts in one go it's a digidash2 lite, so can only log one channel... I could take a GPS log at the same time I suppose...
James
www.warnercars.com
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afj
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| posted on 15/7/09 at 08:30 PM |
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can you look at the graph after a session on track, take a laptop i mean
eerrrrrrrrrrrrrrrr
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cloudy
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| posted on 15/7/09 at 08:44 PM |
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Will do, I presume i'm looking for any drop below 30ish psi (idle hot pressure) whats dangerous? I presume 0psi for any time at all is
terminal?
James
[Edited on 15/7/09 by cloudy]
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procomp
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| posted on 16/7/09 at 06:49 AM |
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Hi
I will make no comments on the pressure or how to do the test. However on the RGB forum there is one guy who runs a data logging overlay on his
videos. Tim Hovred. His videos will clearly show his oil pressures temperature and G forces over a full race. This may give you an indication of what
affect the pressures in different situations.
LINK TO VIDEOS.
HTH
Cheers Matt
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cloudy
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| posted on 16/7/09 at 09:07 AM |
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Thanks Matt, that's a good comparison to see "normal" figures
Interestingly his just stays very static, doesn't change even when revving or idling? I'm sure bike engines don't do that normally!
[Edited on 16/7/09 by cloudy]
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matt_gsxr
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| posted on 16/7/09 at 07:47 PM |
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James,
Oil pressure on these GSXR1100's is a bit strange (as you probably have noticed).
At idle when cold mine is way high (100psi or maybe a bit more), the manual suggests it should be lower, but I swapped the pressure relief valve and
it made no difference. Subsequently rf900rush confirmed that this is what they do. (rf900 has similar bottom end to GSXR1100, different clutch
FWIW).
I haven't used mine enough to recognise pressure changes with cornering so I can't comment (and my engine is the other way around to yours),
although when I talked to the side-car chaps they suggested a bit of over-filling and a sump-baffle (the directions of force are different in mine,
prop and no chain, so I'm not sure on that).
I haven't yet gone around any corners, these are for next week after I have sorted out the straight stuff.
Here is a picture of a sump baffle that I inherited (which fits the GSXR1100W). I will probably use it so can't offer it, but it shows the
design. You are not short of design skill I know, but there is no need to reinvent everything (unless you want to of-course!). They used a sump
gasket above and below in the standard fashion.
 
GSXR1100WP SUMP BAFFLE
Matt
p.s. how did you get your pressure log? Can you show it along with a RPM trace? If those dips are braking induced, then I think you want to get rid
of them (but you know this already).
[edited for precision]
[Edited on 17/7/09 by matt_gsxr]
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