The technical adventures of Dr_C

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The rods are refurbished with new bushings in both ends, and the head has new inlet valves/guides and coffee is on!

7d37febfe867aa794c1e46141f7adbc4.jpg
 
I found a 1 bar gauge (15 psi) to help identifying if there is something splashing around on the inside. I chose a banjo to make easy to measure on the oil supply for the cams aswell.

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Jeez, you blow up a motor and it's practically done already. I blow up a motor and most the parts remain in a crate. I gotta get cracking. I still have to send out the heads to have seats cut and installed. I have a lot of catching up to do!!
 
bushmechanic said:
maybe it was the bloke on the left in the team photo .. he looks shifty :D
Click to expand...
I'm sure it was him, all right! ;-)

Got some nice info here during my vacation in Crete. The lifters are now coated with DLC and will post back today! So coming home on Friday, assembling the last bits on Saturday and maybe practise on Sunday! ☺ Difficult sitting here by the pool saying "Gin and tonic" all the time...
 
I'm ensuring that the cams and the crank are not swallowing all the oil, leaving nothing to the piston squirt. Making a nozzle for the cams out of a M3 stop screw with a 0,6 mm hole. Drlling in steel with a 0,6 mm drill has to be done in the same manner as when hedgehogs have sex - very careful!

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Dr C, How small did you make the hole in the crank restrictor,
is it the same 0.6mm? looks like the one I am using is way to
big.
 
spanner said:
Dr C, How small did you make the hole in the crank restrictor,
is it the same 0.6mm? looks like the one I am using is way to
big.
Click to expand...
Spanner, my old 82mm stroke cranks had this bolted nozzle with a 0,5 mm hole. This crank had 0,6 mm nozzle in the big end pin and 0,5-0,6 mm for the CB bearing squirt. The new nozzle, in the end of the crank, is 0,6 mm. The piston squirt nozzle is 0,8 mm big, so I guess with 1-1,5 bars pressure there will be quite good cooling provided!

After 3 days of intense work the bike is finally ready for race! Oil pressure is finally ok (Thanks for the input, Bushie), and also the biggest challenge (stopping water from entering the oil) is solved. Dodgy o-rings on the liner, finally turned out to be the culprits.
 
Spanner, my old 82mm stroke cranks had this bolted nozzle with a 0,5 mm hole. This crank had 0,6 mm nozzle in the big end pin and 0,5-0,6 mm for the CB bearing squirt. The new nozzle, in the end of the crank, is 0,6 mm. The piston squirt nozzle is 0,8 mm big, so I guess with 1-1,5 bars pressure there will be quite good cooling provided!
Click to expand...

I am a little confused here:eek: The oil goes first through a 0.6 restriction at the end of the crank, then it goes through a 0.6 restriction in the big end pin?
 
Husaberg went to a 3mm oil feed hole in 2003 Mats. so it was going up to the head and into the end of the crank. later in 04 just the crank and then in 2005 the crank and under the piston.

I think the reason for the 2003 change was because there was always some cack in the eye so they just let it block the big end instead!

no surefire idea though....

taffy
 
My 2005 had no restriction at the end of the crank, 6mm hole.

There is a small 0.6mm? hole where the oil exits the crank pin.

Trying to understand why you have two restrictions in series Dr C?

Nice roads there Dr C I bet you wish you had the RST bike with you:)
 
spanner said:
My 2005 had no restriction at the end of the crank, 6mm hole.

There is a small 0.6mm? hole where the oil exits the crank pin.

Trying to understand why you have two restrictions in series Dr C?

Nice roads there Dr C I bet you wish you had the RST bike with you:)
Click to expand...
Spanner,
Long explanation really...
Old crank "resistance": 0,5mm entering the end of the crank
"New" crank "resistance": 0,6mm entering the crank pin AND 0,7mm CB bearing squirt in parallel with each other.

With this change the pressure drop of the new crank will be less than half of the old crank. Practically, the new crank will steal more oil from the rest of the consumers (head and piston). I wanted to make sure the pressure comes up again to ensure a working piston cooling. The roller bearing in the big end only requires very little oil, so I tried the 0,6 mm restriction and the end of the crank, to restore distribution to what it was with the old crank. It would have been better to reduce the nozzle for the CB bearing, but that is more tricky to do...

Oh, yes! Those roads were fantastic! I didn't miss my RST bike though. If the temperature would have been 10 degC lower, I sure would have missed my leathers! THEN perhaps also an RST bike... ;-)
 
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