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increasing Oil pressure + stainless filter test

bushmechanic

bushmechanic

Joined Jun 2007
4K Posts | 1K+
south east WA Australia
I removed the copper washer on the hex bolt that holds the oil pressure relief valve in and added a small washer to increase preload. total increase about 1.5mm.

as stock the oil pressure at idle was 20 psi going to 30 at high rpm (7000) now its 30psi at idle and 40 at high rpm.

also tested the delay at cold startup before the oil pressure comes up with very thick oil and the standard delo400. its the same.

since I was mucking about with oil I took the oppourtunity measuring this delay with thick oil and an empty filter chamber to test paper Vs stainless mesh, there is no oil flow advantage in using the stainless filters.

in case anyone missed the other thread on scotts filters there is also no possiblity of your pre 09 berg engine getting unfiltered oil with either filter because the relief valve simply returns excess oil to the gearbox.

also and just FWIW in the 15 or so paper filters That ive used in the last 220hrs, the biggest hole I could find measured 40 microns.
 
Is that 220hrs with the mod. I'm not a big filter changer, or oil changer for that matter.
 
soory I didn't see your question

no the 220 hrs and paper filters was with standard setup. I got the idea from KTMtalk where they have a factory bulliten to add 1mm prelaod to the spring.

I run the stainless filter now, shouldn't cave in, hey you found a pluss to the stainless
 
I've had a crushed oil filter on a KTM too. Revved the bike before the oil was warmed up in cold weather.
 
I'll be getting a stainless soom, I'm due for oil change #2 soon and all I have is a k&N. 155 hours.
 
I'll be getting a stainless soom, I'm due for oil change #2 soon and all I have is a k&N. 155 hours.
Click to expand...

hey thats great, It makes everyone else look rather silly chainging oil every ride, save the planet indeed :D

I figure my bike does mostly 2000-6000rpm so my oil pressure is lower on average than a 450 or 550 that turns the same pump faster. mine should be 30psi most of the time now, just like the smaller engines.
 
So Bushie, why is more oil pressure a good thing? My understanding is that ball/roller bearings are happy with splash lube, and the head is fed by the cam chain.

Steve
 
well not more oil pressure specifically but at least going for the same as the 450 and 550 are getting, the idea really was to increase the oil flow rate to keep things cooler and flush out any grits quicker.

I want to add an oil line to the rocker pins so that will use more oil and any more flow should make the rest of the bearings more happy, not 100% sure if they are as happy as they are ever gonna get with the stock setup? the big end in particular, mine was starting to go at 200 hrs. It gets a hard time in my bike :oops:

there is an oil jet squirting on the underside of the piston, the counterbalancer bearing jet and the big end that have pressure feed. what I'm hoping for is more of a flushing action for the big end than it currently has.

tried it because its cheaper than a high flow aftermarket pump, apples to oranges perhaps but the RFS engines reportedly last longer with higher pressure, they have been machining the pump impeller, porting the cases where the pump runs and increasing the prelaod on the relief valve spring.

it only took 15 min to make the change, nothing to loose as I see it.
 
I'm intrigued by this simple and dirt cheap mod
what was the thickness of the washer you used.
me thinks 20psi is kinda low!

8) THUMBS UP 8)
 
1mm thick, I stole it from the 4mm hex bolt that holds the plastic front sprocket guard on. the copper washer I removed is 1.2mm thick. so 2.2mm increase in PL

had a thought that perhaps as new the spring may have had more go in it. DaleEO found the 570 oil pressure spec at 30psi for the hydraulic tensioner.
 
I know high oil pressure is desirable for plain bearings to avoid metal to metal contact,
But I think with rollers to much oil in a bearing may cause overheating from the rollers
pushing the oil out of the way, extra friction.
I was looking at putting an oil cooler on my bike in that case it my be necessary to increase
the pressure to overcome the extra restriction but the pressure would be the same at
the bearings
Any other opinions?

Cheers and Merry Christmas to everyone,
spanner
 
TeamSOS said:
F+ Are you kidding with us on your oil change interval?
Mark
Click to expand...

No, I just looked and thats where I'm at. All my oil changes fit into 34.5 oz coffee can, I can't find all the emty oil containers. I just about make-out with the thing at least once a week but if it looks and runs good I leave it alone. I didn't even add any after I dumped it in a river. I try not to hit the flat spots where I can go wide open and I think that helps.
 
I baught it last march new and have 3113 miles as of today. I broke it in how I ride it. It's like black coffee in there man.
 
more oil flow rasing temp ?

maybe, not sure about that, the 35mm bigend has more space to let the oil out than the 32 ... I think

interesting point though, I'll look into it.
 
F+ said:
I baught it last march new and have 3113 miles as of today. I broke it in how I ride it. It's like black coffee in there man.
Click to expand...
...F+...now for real......change your oil dude...that is scary !!!!! Regular conventional motorcycle oil will do. You do not have to buy 30.00 a quart oil. Rotella is only 10.00 a gallon./ PLEASE!!!!
Mike
 

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