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8 valve Oil gallery question (Photo included)

  • Thread starter Thread starter ashdricky
  • Start date Start date
A

ashdricky

Guest
Hello I am wondering if anyone has experience with the internal workings of the 8 valve engine. As you can see I have labeled the ports under the oil pressure sensor for identification purposes.
Blue-Oil Feed from pump
Yellow-Oil return to crankcase (gearbox?)
Red-Oil return to transverse oil Gallery*
Orange-Transverse Oil Gallery*

What I need to know is if the single source of oil for the transverse gallery (which oils the cams) is the orifice I have circled in red? Or do the cams also get fed from somewhere else? many of the oil coolers I have seen dump the cooled oil into the crankcase (gearbox) return that is circled in yellow therefore allowing some of the oil to flow around the adapter's oil pickup and into the Red port leading to the transverse oil gallery. If the cooled oil was dumped onto the clutch basket instead would this cause the Transverse gallery to be starved?:confused:
Thanks-Rob

2012-03-17_20-49-59_601-1.jpg
 
The return oil dumps back into the distribution cavity , not directly to the transmission. Once in the cavity it will split and go to both the transfer galley as you reference, and the transmission.

Do NOT dump the oil into the clutch area or a bunch of parts in the engine won't get proper oil flow.
 
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Nessism said:
Do NOT dump the oil into the clutch area or a bunch of parts in the engine won't get proper oil flow.
Click to expand...

What if I dumped the cool oil into the transverse gallery via the 14mm orifice right above the ignition cover?
 
I would think that would effectively cut the oil cooler out of the circuit. Equal oil pressure would be on both sides.
 
possibly, but the pressurized oil from the pump is routed directly into the oil cooler line via a brass pickup, then oil would enter the transverse gallery from there feed the cams and other areas no?
 
the oil would flow around both sides of the brass oil pickup back to the rear port that leads to the trans
 
I have a gs1000 8v suzuki oem manual and the flow diagram is there.
i,m not very good with computer but i will try to find a way to put it in this thread.
Marc
 
ashdricky said:
the oil would flow around both sides of the brass oil pickup back to the rear port that leads to the trans
Click to expand...

Missed this response the other day...

The oil flow path to the transmission would be more convoluted if you dumped the flow into the transverse galley, but I think it would work.
 
The entire area under the plastic oil filter switch is pressurized. Some coolers provide a kit which replaces this switch with one that has a take-off added for the lines. The trouble is oil starvation elsewhere. If there is less flow resistance through the cooler than the other oil pathways diverging from this area, then there will be a loss of oil flow everywhere else. A flow restrictor should be used in the take-off to prevent this.
 
1980GS1000E said:
The entire area under the plastic oil filter switch is pressurized. Some coolers provide a kit which replaces this switch with one that has a take-off added for the lines. The trouble is oil starvation elsewhere. If there is less flow resistance through the cooler than the other oil pathways diverging from this area, then there will be a loss of oil flow everywhere else. A flow restrictor should be used in the take-off to prevent this.
Click to expand...


??? Sorry, don't understand what you are trying to say.

The oil distribution cavity is pressurized with flow up though the feed port from the pump. Once the oil fills the cavity it splits and some goes to the transmission and some to the crank/top end.

A proper oil cooler adapter has a piece that fits down onto the oil feed port and diverts 100% of the oil flow from the pump away from the cavity, instead flowing into the oil cooler inlet tube. After the oil is cooled, the return flow dumps down into the oil distribution cavity where it goes on it's way either to the transmission or transverse galley.
 
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I thought this might be of interest. Here are two pic's of my aftermarket oil gallery cover and oil cooler that are on my '79 GS1000E.
Didn't realize just how big that gallery cover was until now when I took pic's of it. I must be used to the smaller stock one on my '82 GS1100E.
The oil cooler has the oil fiitings both mounted on top, this allows oil to stay in the tank and allows me to get a good reading on my oil level without second guessing.
I was going to return the bike to stock, as I really don't like fancy gizmos
on my bike, but a guy talked me out of it being I live in Florida and it does get really hot in the summer down here, so I kept it and haven't had any problems with or because of it.
100_1709.jpg


100_1708.jpg


100_1710.jpg
 
Nessism said:
??? Sorry, don't understand what you are trying to say.

The oil distribution cavity is pressurized with flow up though the feed port from the pump. Once the oil fills the cavity it splits and some goes to the transmission and some to the crank/top end.

A proper oil cooler adapter has a piece that fits down onto the oil feed port and diverts 100% of the oil flow from the pump away from the cavity, instead flowing into the oil cooler inlet tube. After the oil is cooled, the return flow dumps down into the oil distribution cavity where it goes on it's way either to the transmission or transverse galley. Without capturing all the oil flow and sending it to the cooler, you won't have any flow through that system at all.
Click to expand...

You are correct. I have not installed a cooler on this type of bike, I have worked with coolers on others, and I appreciate the correction. Sedelen's picture is perfect. The OP needs this info. On my 900F and 900 Ninja, which have stock coolers, if memory serves correctly, there were dual oil pumps. one for the cooler and one for the engine.
 
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Thanks Steve for the scheme, i tried to take a pic of it with no luck.
I have the same oil cooler adapter on my gs1000 bought it off ebay a few years back.
Just dont forget to put the round seal to have all the oil going to the cooler.
Marc
 
Thank you all for the information, especially the schematics, I have already built adapter plates using the traditional design. (below is a photo of my 2nd gen kit installed)
2012-03-17_20-56-54_524.jpg


I am looking into designing something new that is easier for me to machine. here is what I believe the new oil flow path would be if I deposit the cooled oil into the main AKA "transverse gallery"
editgalll.jpg


ultimately what is the verdict? Will it starve any area of oil if all of the pressure comes from the transverse gallery rather than the pressure sensor gallery?
 
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As mentioned already, I suspect it would be fine to dump the return oil into the transverse galley but some R&D testing is recommended. You could make another adapter, or use a T fitting, and add a pressure gauge into the system to measure oil pressure in the distribution cavity. It would be interesting to see what happens to the pressure with the various configurations of the system: with no cooler, with cooler and return flow back to cavity, with cooler and return flow to transverse galley. If you return to the transverse galley the main thing is to make sure the distribution cavity is getting some flow and thus, the transmission gets enough oil.

When installing an oil cooler you may want to also install the GS750 oil pump gears since they spin the pump faster than the stock gears. I know this works for the bigger GS bikes, but not positive the gears fit the smaller engines.
 
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Nessism said:
When installing an oil cooler you may want to also install the GS750 oil pump gears since they spin the pump faster than the stock gears. I know this works for the bigger GS bikes, but not positive the gears fit the smaller engines.
Click to expand...

dose installing 750 gears require me to split the case?........again.
 
ashdricky said:
dose installing 750 gears require me to split the case?........again.
Click to expand...

no, just the clutch cover and the clutch.
just a thought......with that oil schematic you posted above, would it not take a long time for the oil to reach the head on cold start ups?
 
Agemax said:
... with that oil schematic you posted above, would it not take a long time for the oil to reach the head on cold start ups?
Click to expand...
That would depend on how much oil fell out of the pump and other passages while the engine was not running. I have never checked for that possibility, but I would imagine that some oil remains in the passages, just waiting to be pushed along when the pump starts up again.

On the other hand, that is one reason that I cringe when I hear a cold engine start up on "choke" and race to 4,000 RPM. :eek:
I try to find the "sweet spot" on the "choke" that allows easy starting with minimal application, meaning 'minimal speed'.
I usually keep starting revs down between 2,000 and 2,500 RPM whenever possible.

.
 
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