compression piston??
- Thread starter madero
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Yes, using the 470 piston in a 650 will give you higher compression. It is a pop-up domed style piston, instead of the 650's flat top design. The 550 uses the same piston as the 650.
You can get the 470 piston from either Wossner or OEM.
Be sure to check valve clearences when fitting this piston. :wink:
You can get the 470 piston from either Wossner or OEM.
Be sure to check valve clearences when fitting this piston. :wink:
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the goal is 66SAE HP on the back wheel.(for supermoto and monobike racing)
Yes ,i have a complete DOMA system,that gives with std settings about 60,7 hp,but this was a little rich setting.so normally about 62SAE hp or 64-65DIN hp.
Here in Belgium the tuned husaberg 650 is about 70Hp on the backwheel,and the superpro's about 72-74HP.
Another tuner speak to me about this and said to take 0,5 mm off the cilinderhead,readapt the valve wholes in the piston,but as advantage that i can use the same piston.
In my area,there is a dealer who make a 730cc husaberg especially for monobike racing and has 86Hp on the backwheel.He has a lot of problems in the beginning,so they mounted now a extern oilcooler on it.
It is a nice piece of work.The topspeed last year of the bike was on Mettet monobike 235km/u.Sounds crazy,but is real.
Hopefully are they a some Husaberg specialist who can me an answer on this topic.
Madero.
Yes ,i have a complete DOMA system,that gives with std settings about 60,7 hp,but this was a little rich setting.so normally about 62SAE hp or 64-65DIN hp.
Here in Belgium the tuned husaberg 650 is about 70Hp on the backwheel,and the superpro's about 72-74HP.
Another tuner speak to me about this and said to take 0,5 mm off the cilinderhead,readapt the valve wholes in the piston,but as advantage that i can use the same piston.
In my area,there is a dealer who make a 730cc husaberg especially for monobike racing and has 86Hp on the backwheel.He has a lot of problems in the beginning,so they mounted now a extern oilcooler on it.
It is a nice piece of work.The topspeed last year of the bike was on Mettet monobike 235km/u.Sounds crazy,but is real.
Hopefully are they a some Husaberg specialist who can me an answer on this topic.
Madero.
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- Berkshire, England
Madero,
That's an interesting result you've got there. We've seen a good strong 65hp (SAE) from the 04 with just an FP race system on it.
Is your engine pretty new or is it fully bedded in etc.?
As for machining the cylinder head, yes that can be done but you end up with complications around the valve train. I have always been advised to look at piston/con rod combinations rather than machine the cylinder head. It's also much easier to step backwards if necessary.
Cheers,
Simon
That's an interesting result you've got there. We've seen a good strong 65hp (SAE) from the 04 with just an FP race system on it.
Is your engine pretty new or is it fully bedded in etc.?
As for machining the cylinder head, yes that can be done but you end up with complications around the valve train. I have always been advised to look at piston/con rod combinations rather than machine the cylinder head. It's also much easier to step backwards if necessary.
Cheers,
Simon
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the bike is indeed new .
now for about 800km and 15 hours on the tripmaster.
thats indeed a good point of viewing what about the valvetrain and taking of material and the cilinderhead.
I am sorry,but 65 Hp with the Doma is not possible,certain not in SAE form.
When i put the bench in DIN I will get also 64 -65hp on the back.I always tested several bikes (crf-450 250,xr650,xr680,cr500...) in SAE.
What about a 470 in 650 config anybody some advice????
now for about 800km and 15 hours on the tripmaster.
thats indeed a good point of viewing what about the valvetrain and taking of material and the cilinderhead.
I am sorry,but 65 Hp with the Doma is not possible,certain not in SAE form.
When i put the bench in DIN I will get also 64 -65hp on the back.I always tested several bikes (crf-450 250,xr650,xr680,cr500...) in SAE.
What about a 470 in 650 config anybody some advice????
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madero said:
The tests I have conducted concur with that. The best achieved with the Doma was 2.7hp less than the FP. However, I also saw a much stronger midrange for several thousand rpm from the Doma compaired to the FP.
madero said:
Only with a 2001 650. All else remaining equal, we had big torque gains using the 470 piston, peak horsepower gains were negligable. It depends on what you're looking for in engine characteristics.
As I metioned above, I think the OEM 04 650 actually has a concave piston rather than a flat top - with that in mind, you may gain something from just swapping to a good quality flat top piston.
Give it a bit more time to bed in and you will probably see some more power naturally anyway :wink:
Cheers,
Simon
After 15h the bike is bedded and you will see no more powergains from just that.
An easy, reliable (for this kind of tuning) and good way to rise compression IS the 470 piston. You wont risk piston to valve collision either. And, if you wanna go back (selling the bike or something) itäs easy to put it back in stock shape.
Most or even all race Husaberg SMs I´ve been around or worked on are running the 470...
Daniel
An easy, reliable (for this kind of tuning) and good way to rise compression IS the 470 piston. You wont risk piston to valve collision either. And, if you wanna go back (selling the bike or something) itäs easy to put it back in stock shape.
Most or even all race Husaberg SMs I´ve been around or worked on are running the 470...
Daniel
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Simon said:
Actually no. It looks like the 04 no longer uses the same piston as the 550, unlike the 2001-2003's.
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70marlin said:
It has a flat spot on the stepped up dome between the valve pockets, otherwise I don't know what to tell you.
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Simon,
What cam was that test bike running that produced 65hp ?
Do you have any experiences of the GW G2/G3 cams ?
I want to get 65hp out of my 2002 650. I got a mikuni pumper carb, big valve head and FP exhaust. Don't know which cam to put in with the Omega piston.
Lloyd
What cam was that test bike running that produced 65hp ?
Do you have any experiences of the GW G2/G3 cams ?
I want to get 65hp out of my 2002 650. I got a mikuni pumper carb, big valve head and FP exhaust. Don't know which cam to put in with the Omega piston.
Lloyd
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madero said:
It is a high compression piston made by Omega. If I remember correctly, when it is fitted it produces a slightly higher comp. ratio than the 470 one. It is apparently a "higher" quality item than the 470 OEM.
Cheers,
Simon
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I don't know Omega here in Belgium.We use Wiseco,or Je or standard ones.
I think for my bike I'm gonna take a 100mm from 650 2003,it has 12.2on 1 with the same stroke(82mm)So from 11.7 to 12.2.
With the 470 the ratio is even more than 12.2,but with a different stroke I don't know how far the valves comes out in cilinderhead,and makes contact with 470 piston.It was not a problem on 2001 and 2003 engines,but what on 2004 engines.(lift cam any different)
If you can give some supporting advice pleads do.(also thanks to Simon)
greeting madero
I think for my bike I'm gonna take a 100mm from 650 2003,it has 12.2on 1 with the same stroke(82mm)So from 11.7 to 12.2.
With the 470 the ratio is even more than 12.2,but with a different stroke I don't know how far the valves comes out in cilinderhead,and makes contact with 470 piston.It was not a problem on 2001 and 2003 engines,but what on 2004 engines.(lift cam any different)
If you can give some supporting advice pleads do.(also thanks to Simon)
greeting madero
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I believe Omega only produce a quantity of pistons and not single ones....
They look like a work of art.
They look like a work of art.
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