Help Support Husaberg:
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
as i have often said. the 450 and 650 have the tallest pistons. they are around 14.4mm to the squish area. you can't use the 450 as a flat piston let alone as a dished piston as the middle would be too thin. i do have a piston as i say.
I think I'm starting to get two similar threads muddled up.
where are you from Johnny?
regards
Taffy
I think I'm starting to get two similar threads muddled up.
where are you from Johnny?
regards
Taffy
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
tomorrow when my gallery is activated i will try and upload some photos. in the meantime you can email me at [email protected] and i'll forward to you some photos of the pistons together etc.
regards
Taffy
regards
Taffy
i have no idea if case heights are the same on the 03 to the 04 models,i'm taking it they mustn't be if they run a higher piston with the same rod length & same stroke?
i'm just a little lost on this one lads.
i was just taking it ,johnyboy has done his homework & just knew that was the piston he needed.
so the 04's as is std ,run a elko piston same as the 628cc & a different case height than every other model 650?
or have i just completely lost the plot?
..weed..
i'm just a little lost on this one lads.
i was just taking it ,johnyboy has done his homework & just knew that was the piston he needed.
so the 04's as is std ,run a elko piston same as the 628cc & a different case height than every other model 650?
or have i just completely lost the plot?
..weed..
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
this is just to show you their combined weight of 580. the factory piston is 280 and mine is 300. I'm prepared to attack the piston 'somewhere' also known as 'anywhere' to get the weight down!
The only way i could think of showing 1mm or 2mm in a photo was to show putty squidged under a ruler. and to all the english is a foriegn language - i made that one up! it must be a mixture of squeeze, squirt and .... dunno!
this will make the standard compression on paper 15.25 to 1 and should really only be attempted with std cam and valves. the torque will be tremendous and the stress very high as well. I would find excuses to port the actual combustion chamber as well to lower it a little.
I've been trying to source programmable ignition timing but all i can get is a vortex with 10 standard settings which before i start i think a sidecarX will need programmes 11-20.... so!
regards
Taffy
The only way i could think of showing 1mm or 2mm in a photo was to show putty squidged under a ruler. and to all the english is a foriegn language - i made that one up! it must be a mixture of squeeze, squirt and .... dunno!
this will make the standard compression on paper 15.25 to 1 and should really only be attempted with std cam and valves. the torque will be tremendous and the stress very high as well. I would find excuses to port the actual combustion chamber as well to lower it a little.
I've been trying to source programmable ignition timing but all i can get is a vortex with 10 standard settings which before i start i think a sidecarX will need programmes 11-20.... so!
regards
Taffy
- Joined
- Sep 30, 2007
- Messages
- 782
- Location
- ???
Well not really,
Quote;
" this will make the standard compression on paper 15.25 to 1 and should really only be attempted with std cam and valves. the torque will be tremendous and the stress very high as well. I would find excuses to port the actual combustion chamber as well to lower it a little."
Yes with the standard cam you would produce very high cylinder pressure as the duration is shorter, at low rpm,
the torque would be tremendous, but detonation a problem as rpm increases.
With a long duration cam high cylinder pressures will be only be produced only when the engine reaches peek volumetric efficiency which would typically be at higher rpm than the standard cam, at low rpm a lot of the inlet charge reverses out of the inlet valve as the piston rises (reverberation) therefore cylinder pressure is not as high, Less torque is produced.
The compression would be higher at peek VE , that is how power is gained but at the loss of low end torque.
Detonation can be less of a problem as everything happens quicker at high rpm.
15.25 to 1 would probably only be suitable with alcohol.
I think you can do a calculation for dynamic compression if you know when the inlet valve closes in relation to
how far up the bore the piston is, but it is an arbitrary figure just as static compression is.
Cheers spanner
Quote;
" this will make the standard compression on paper 15.25 to 1 and should really only be attempted with std cam and valves. the torque will be tremendous and the stress very high as well. I would find excuses to port the actual combustion chamber as well to lower it a little."
Yes with the standard cam you would produce very high cylinder pressure as the duration is shorter, at low rpm,
the torque would be tremendous, but detonation a problem as rpm increases.
With a long duration cam high cylinder pressures will be only be produced only when the engine reaches peek volumetric efficiency which would typically be at higher rpm than the standard cam, at low rpm a lot of the inlet charge reverses out of the inlet valve as the piston rises (reverberation) therefore cylinder pressure is not as high, Less torque is produced.
The compression would be higher at peek VE , that is how power is gained but at the loss of low end torque.
Detonation can be less of a problem as everything happens quicker at high rpm.
15.25 to 1 would probably only be suitable with alcohol.
I think you can do a calculation for dynamic compression if you know when the inlet valve closes in relation to
how far up the bore the piston is, but it is an arbitrary figure just as static compression is.
Cheers spanner
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
one could argue that with lower VE at higher revs that the HC piston restores the VE over a wider band. however, this is all forgetting where you start, what you have and what you are changing too.
I don't know why i wrote it but i should have written that the piston should only be used with a race cam. the opposite of that which i wrote.
with a std cam and a HC piston all your eggs hatch at once.
I have yet to try the piston but someone i sold one too says that his bike is way better. it is though in the old 37/30-32 head so that throws a spanner in the works for you...
regards
Taffy
I don't know why i wrote it but i should have written that the piston should only be used with a race cam. the opposite of that which i wrote.
with a std cam and a HC piston all your eggs hatch at once.
I have yet to try the piston but someone i sold one too says that his bike is way better. it is though in the old 37/30-32 head so that throws a spanner in the works for you...
regards
Taffy
- Joined
- Sep 30, 2007
- Messages
- 782
- Location
- ???
quote;
I have yet to try the piston but someone i sold one too says that his bike is way better. it is though in the old 37/30-32 head so that throws a spanner in the works for you...
Well not really as I don`t know much about his bike or what was wrong with it.
Goodnite Taffy
Cheers spanner.
I have yet to try the piston but someone i sold one too says that his bike is way better. it is though in the old 37/30-32 head so that throws a spanner in the works for you...
Well not really as I don`t know much about his bike or what was wrong with it.
Goodnite Taffy
Cheers spanner.
hi, taffy as i saw the wossner has the same height but it is dished too, i was wondering what is the height diference between an elko and the oem '03(all flat and no dished at all) if you have one could you send a photo with elko vs '03?
- Joined
- Nov 20, 2001
- Messages
- 17,028
- Location
- Ely, England
johnyberg said:
i have told you before. the elko/mahle is 1mm taller at the the rim and drops 2mm into the middle which is therefore 1mm lower than the '03 piston centre.
agree with your sums weed.
getting a little frustrated with this one. :|
regards
Taffy
the 01 conrod which came out was 134mm/which was 3mm below deck height at tdc,now i replaced it with a 03 conrod which is 135mm which makes it 2mm below deck height (as std) at tdc.now mines been marginally decked again since then.
..weed..
..weed..
Similar threads
Register CTA
Register on Husaberg Forum! This sidebar will go away, and you will see fewer ads.
Sign Up
