hebo manston \ polini evo???
- Thread starter nrg69
- Start date
I don't think brass is a good idea. Removing heat from the combustion chamber = removing power. However it's also questionable if there is an cooling improvement, since yes brass conducts heat better than aluminium, but aluminium collects heat better from the surrounding gasses.
I think on the head, the squish zone must be slightly rough, while the combustion cup should be polished. But those are just details.
I think on the head, the squish zone must be slightly rough, while the combustion cup should be polished. But those are just details.
tiba_karotsu
OVERREV TUNING
Hebo has a higher CR than most cilinder kits (17:1) so if used with appropriate race fuel should give a nominal hp increase at peak, it's easier to machine the head with a flat squishband, this type of head is utilized by 125 & 250 GP machines. i would also like to convert to flat squish band.
BuEn
Danish Tuner
Try www.scooter-attack.com they have a VHM head for polini evo.
I don't like high CR. High CR increases power in the midrange, while a lower CR will improve peak power.
Anyways the real CR in a 2stroke is a highly dinamic thing. If the combustion chamber has more volume (lower geometrical CR), this means also that a greater quantity of mixture will fill the cylinder. Now add the pipe suction/compression waves and the confusion is total.
Next thing I'm going to try on my racer is relatively low geometrical CR, but with powerfull exhaust pulses.
Anyways the real CR in a 2stroke is a highly dinamic thing. If the combustion chamber has more volume (lower geometrical CR), this means also that a greater quantity of mixture will fill the cylinder. Now add the pipe suction/compression waves and the confusion is total.
Next thing I'm going to try on my racer is relatively low geometrical CR, but with powerfull exhaust pulses.
cazz..... quindi anche le esterne sn diverse...
tnx browni, are you really sure that outer is different??
max tedeschi order for me the vhm heads, but it never arrived....
i think that the cause is the transfer of the vhm in the new company.
there will be to wait a lot of time...
but my engine can't waitttttttt
tnx browni, are you really sure that outer is different??
max tedeschi order for me the vhm heads, but it never arrived....
i think that the cause is the transfer of the vhm in the new company.
there will be to wait a lot of time...
but my engine can't waitttttttt
cazz..... quindi anche le esterne sn diverse...
tnx browni, are you really sure that outer is different??
max tedeschi order for me the vhm heads, but it never arrived....
i think that the cause is the transfer of the vhm in the new company.
there will be to wait a lot of time...
but my engine can't waitttttttt
tnx browni, are you really sure that outer is different??
max tedeschi order for me the vhm heads, but it never arrived....
i think that the cause is the transfer of the vhm in the new company.
there will be to wait a lot of time...
but my engine can't waitttttttt
