View Full Version : Benefits if I upgrade st185 oil sump to st205 sump?

01-18-2008, 08:01 PM
As per above, there is a 3 piece st205 sump (incls baffle and oil pickip) available, but i don't know much about sumps.

Does anyone know if its a straight bolt on and what benefits are to be gained from the swap?

Gary ST165
01-18-2008, 10:53 PM
its has many gains:

better beefier structural design to help tie in the bottom end and gearbox housing

larger surface area / aluminium to help dissipate heat

improved baffling / windage plates

uses higher flow oil pump / smaller pump pulley / deeper gyrator / increased pressure

easy access to oil pressure relief valve

sump features additional take off ports near filter housing for aftermarket oil pressure and temp (plugged and unused on the road going st205)


modifications (tap additional threads) to 185 block / 185 crank shaft oil seal plate are required to accommodate 205 sump.


worth while upgrade.

01-19-2008, 12:40 AM
what is a sump?

Gary ST165
01-19-2008, 01:53 AM
oil sump = oil pan

01-19-2008, 03:31 AM
saw your reply on gtoc mate - again, many thanks for the advice :)

Gary ST165
01-19-2008, 04:42 AM
no worries mate.
just to make you aware, you also need to buy a ST205 oil pump, ST205 oil pump pulley and ST205 timing belt. (or use equivalent MR2 SW20 revision 3 parts)

...and you will have 2 oil filter plates!
1 on the ST205 sump pan and 1 on the ST185 oil water heat exchanger....not ideal :laugh:

01-19-2008, 04:52 AM
shite.. and i just bought it lol.
well time for me to go find those parts then - i know of a donor car that is stripping those things at the mo so hopefully i can pick those up.

what is the oil filter plate? do you have a picture? possible to remove or negate one of the plates?

01-19-2008, 05:10 AM
haha - did a bit of thinking and understand what you mean now. the plate that the oil filter attaches to :)

I'll just block one off (most likely the one on the sump)

what you think? sump or on the block?

01-19-2008, 05:20 AM
oil sump = oil pan

oil sump doesnt mean oil pan, it is the bulb that holds extra oil. Large sump pans mean extra oil capacity

Gary ST165
01-19-2008, 06:03 PM
haha - did a bit of thinking and understand what you mean now. the plate that the oil filter attaches to :)

I'll just block one off (most likely the one on the sump)

what you think? sump or on the block?

Neither filter plate can be completely "blocked off" as such. The design of the 185 and 205 oil lubrication systems means that the oil must still be able to recirculate through the plate and function the same as if an oil filter was in situe. Ie flow up through the centre of the oil filter plate and exit again to supply the engine.

i'm relocating my oil filter to a remote plate and adding an oil cooler. hence i will use neither 185 or 205 stock oil filter location.

The stock ST185 oil filter location is bad in that it sits too close to the hot turbo down pipe. Cooking the oil and filter before it enters the block. I would cap this by using an oil take off plate and "mushroom" sealing (recirculating) cap routed to a oil thermostat and additional engine oil cooler radiator.
.... or use the 185 filter plate as a take off point to measure oil temp and pressure

You could mount the filter on the ST205 sump. thats a better location, assuming you do NOT take the car "off road" as the filter is more exposed to foreign object damage.

I posted quite a lot of detail in this thread on MR2OC regarding using an ST205 sump, ST185 block, other required parts to make it all "work".

Oil Cooler dilema (gen2 block, gen3 everything else):

Good luck with the mods. Swapping to the ST205 oil set up and additional coolers is a massive step forward in prolonging the life of the oil and ultimately the engine.

The ST205 oil pump pulley can be obtained from a vehicle dismantlers. It has 2 less teeth than the ST185 pulley hence drives the ST205 pump faster.

Only buy new ST205 oil pump and ST205 timing belt for maximum service life.

The ST205 timing belt is fractionally shorter and has one less tooth than ST185 timing belt. It is required to reduce the slack in the belt from using the smaller fewer teeth pulley.

If you have any further queries send me a PM on which ever forum suits you best. my usual forum is GT4OC.


hope that helps.