dr_c piston?

popup · Apr 14, 2009

just wondering dr_c ,whats going on with that piston.
thought you were using wossner std pistons because of the flat top & reasonable light weight at 282g.
why are you machining weight off the std husaberg flat top piston?
do you think it maybe stronger than the std wossner after machining?
have you had trouble with the std wossners?
whats the story lad?
..weed..

Taffy · Apr 16, 2009

he's gone from dished to flat to domed weed. he's using the 470HC piston now - or will be!

regards

Taffy

swedishsteel · Apr 17, 2009

He is now having 13,9:1 in comp, so i dont think a 470hc is enough.And he tryed that longtime ago. Later Elko and som special wÃƒÂ¶ssner, He talked about ordering a custom hc piston before. And if I know him right. the machining was not enough for Mr-perfect

Maybe he tell us so we dont need to guess.

Regards

swedishsteel · Apr 17, 2009

I think he is working with the bike, jetting it and adjust the new hpi ignitionin the dyno, The first race for his class is next weekend 25-26 april.

Regards

swedishsteel · Apr 17, 2009

I think he is working with the bike, jetting it and adjust the new hpi ignitionin the dyno, The first race for his class is next weekend 25-26 april. so i dont think he got the time to be here just now.

Regards

popup · Apr 18, 2009

yeah thats no probs,i'll wait.
i'm sure there is a few of us out there who is interested in the best sort of replacement pistons available.
i know the elko is the lightest by about 10g from the std wossner but that has the dished top.
from underneath the wossner just doesn't look as strong as the old std berg piston,but then you are throwing extra weight unnecessarily maybe?
..weed..

Dr_C · Apr 21, 2009

I had WÃƒÂ¶ssner make me pistons with reinforcing bridges and proper squish (1,00mm). They are totally flat. After having done some work on the combustion chamber (+ 11 CFM/28" water, at 6-8mm lift) the geometric compression ratio was approximately 13,9:1. The forging was too heavy as the empty piston body was 373g. I thinned the center of the roof to 5mm and the other cavities to 4mm. That made the piston go down to 342g. I think it is possible to loose another 50g if being a little comitted to the task, but time to race is getting short... This piston seems very solid, just a bit too heavy.

Race preparations are allways pulling late hours, so now it's time to hit the sack! Thanks to Swedish Steel for putting in some valuable hours in helping out!

ElSnorro · Apr 22, 2009

Dr_C said:
I had WÃƒÂ¶ssner make me pistons with reinforcing bridges and proper squish (1,00mm). They are totally flat. After having done some work on the combustion chamber (+ 11 CFM/28" water, at 6-8mm lift) the geometric compression ratio was approximately 13,9:1. The forging was too heavy as the empty piston body was 373g. I thinned the center of the roof to 5mm and the other cavities to 4mm. That made the piston go down to 342g. I think it is possible to loose another 50g if being a little comitted to the task, but time to race is getting short... This piston seems very solid, just a bit too heavy.

Race preparations are allways pulling late hours, so now it's time to hit the sack! Thanks to Swedish Steel for putting in some valuable hours in helping out!

Nice engineering. Hope this piston will last longer than the elko (which cracked if im right?)
What's the weight off the Elko piston?

bushmechanic · Apr 22, 2009

272 or 278gm for the elko I think

Search

Search

dr_c piston?

popup

Taffy

swedishsteel

swedishsteel

swedishsteel

popup

Dr_C

ElSnorro

bushmechanic

Similar threads

Register CTA

Recent Discussions