banshee cylinders

[700vflash]

When looking into the intake ports of the cylinders I noticed some have the 2 main ports and a smaller port on the roof. I have also noticed some that have the 2 main ports and 2 smaller one's on the side and the one on the roof. I was just wondering what is the difference of the two?

[dirtydownunder]

 

 

far left is stock, 2nd is ported stock 3rd is cub 4th is stock ported with boost ports.

 

the more air you can get into your engine the better, thats why they (pro porters) add the "boost ports / worm holes" to stock cylinders (pic 4 (bottom pic)) when porting for max power. they can also do the same to the exhaust, so you have one main port then 2 either side on the exhaust, because you need to get all the air out as well !!.

 

the 3rd pic, the cub. is an after market cast cylinder for the banshee, that has 3 inlet ports and 3 exhaust ports, these cylinder are made to flow well for good hp.

Edited March 18, 2011 by dirtydownunder

[700vflash]

Thank you very much, been wondering but never asked. The one to the far right is exactly what mine look like, but most commonly I see the one all the way to the left. So those boost ports are added on? I also here peolpe talking about serval cylinders, are those different as well?

[dirtydownunder]

no the serval isnt different to the cheetah cub, the pic far right is a serval. yeh the boost ports are added to the stock cylinder's

[700vflash]

Thanks for the info!!

[camatv]

most drag ports and even most more recent porting dosent use the short dick boyesen ports. the picture you have on the right shows how small most are. most times they really add no increase if anything at all, you can also see in the cub that those boyesen's are HUGE and also not in the picture is the really high up transfer support/ dividers in the tunnel the boost port can be aimed a lil diferntly and help fill the lower sections of the transfers. on teh stock cylinders with them being the size of a pencil they dont do much but add turbulence at highr rpms ( in my opinion) some of the most linear powerbands i have done were from ditching the teeny tiny lil pencil dick boyesen ports.

 

 

now getting them really big thats seems to work much better.. BUT the trans window seems to need to be raise also. i think looking at them that way the charge distributs more across the bottom of the transfers.

[SonOfSand]

most drag ports and even most more recent porting dosent use the short dick boyesen ports. the picture you have on the right shows how small most are. most times they really add no increase if anything at all, you can also see in the cub that those boyesen's are HUGE and also not in the picture is the really high up transfer support/ dividers in the tunnel the boost port can be aimed a lil diferntly and help fill the lower sections of the transfers. on teh stock cylinders with them being the size of a pencil they dont do much but add turbulence at highr rpms ( in my opinion) some of the most linear powerbands i have done were from ditching the teeny tiny lil pencil dick boyesen ports.

 

 

now getting them really big thats seems to work much better.. BUT the trans window seems to need to be raise also. i think looking at them that way the charge distributs more across the bottom of the transfers.

 

Are you saying the boost ports in the bottom picture of the stock cylinder don't add any power? Where are the boyesen ports?

 

Thanks.

[camatv]

in my PERSONAL experience not really enough to warrant putting them in.. unless you go REALLY big..

[700vflash]

I would assume having the intake ports opened up along with the small boost ports is a good step above stock. May not be noticeable, but then again most single mods are not.