Worm aux holes.. Are they worth it?

[lassek]

Hi all.

I was just wondering how much the auxiliry "worm holes" really give?

Lets say you have a Blaster cylinder that is ported and modified in the intake...


And the exact same cylinder but now with the 2 small wormholes in the intake that leads to the transfers, is it gonna give a difference? Or only a fragment ?

Im asking because some people do it other dont.. i havent .. I left that out when i ported my intake..


Lasse

 

[lassek]

Anyone....... ?

 

[FLOTEK]

they are boyssen ports named after the man who discovered how to use this design to start the charge sooner and widen the power curve . later he worked for honda racing in the R&D dept unti lthey bought the rights out to use design . since then pretty much every modern frontal/cylinder (i know they are all mostly case induced now) reed induction high performance 2 stroke engine has them in the intakes for a reason including all the cylinders used by CP industries with their industry leading aftermarket kits ,given the time money the research and devolpment over the years of all these manufacturers they surely felt it was "worth it" to add them.

 

[lassek]

Okey ... so maybe I will drill them next time my cylinder is off..

The reason I ask, is you just dont undo them! .. :-D First drilled, they are there forever.

 

[FLOTEK]

Okey ... so maybe I will drill them next time my cylinder is off..

The reason I ask, is you just dont undo them! .. :-D First drilled, they are there forever.

yeah holes out the side of your jug are forever too ,be careful only takes a couple seconds to ruin a jug

 

[370]

Hi all.

I was just wondering how much the auxiliry "worm holes" really give?

Lets say you have a Blaster cylinder that is ported and modified in the intake...


And the exact same cylinder but now with the 2 small wormholes in the intake that leads to the transfers, is it gonna give a difference? Or only a fragment ?

Im asking because some people do it other dont.. i havent .. I left that out when i ported my intake..


Lasse

there is a time and a place for boysen ports.. not every engine benefits from them.. in fact i just had a discussion about boysens the other day.. more area is not always the key to more power.. more area = less velocity.. now depending on what you have done porting wise to that cylinder already boysens may or may not help you.. if you take teh time to do them.. do them correctly.. a little 3/16 hole isn't gonna do sh*t.. look at any engine that has boysens cast into it.. they are big.. also how big are your intake windows? theres more to it then getting out a drill and goin to town.. if i were you i'd research this topic more before you cut

 

[370]

Okey ... so maybe I will drill them next time my cylinder is off..

The reason I ask, is you just dont undo them! .. :-D First drilled, they are there forever.

if you put them in and decide you don't like them they are not forever.. there are a few ways to seal em back up.. devcon, epoxy, and tig welding.. i had a set of banshee jugs when i first started out that i did boysens on.. the drill bit did pop through.. no big deal though since i wanted the boysens bigger anyway... what i did is devcon the outside of the jug.. making sure that a nut will still go on the stud.. and then proceeded to make some big banshee boysen ports.. if i woudl have had access to a tig welder i woudl have done it that way.. it's been 4 years now... that devcon is still on the outside of that set of cylinders.. so if you put boysens in and don't like em THEY AREN'T FOREVER

 

[370]

here is a pic of a set that were done sh*tty... they are horribly uneven, they were never blended in, and while we are talking about the pic... the intake windows aren't realy pretty either.. this cylinder came to me for a repair.. the porting timing was WAAAYYY off. while i was in there i blended those boysens into the wall more to make them look even... and blended them into the transfer tunnel correctly as well.. these were literally just holes drilled from the intake box into the transfer tunnels... NOT CORRECT..

 

[lassek]

370:

Thanks, thats alot of info.. but very usefull... I must admit thoose worm holes i have seen do NOT look like the picture you posted! .. : ) they are round and i top corners mostly.. not in the sides..

But as i only have a mild port, maybe i should just leave it out..

 

[370]

in the top corner?

 

[lassek]

I think, im dont remember it correctly.. i dont have the pictures anymore ..

 

[370]

there are ports that are drilled from the intake box upward into the transfer tunnels right before the port opening.. i doubt you've ever seen them though.. they are called "dizzy ports" rick from macdizzy "invented" them.. is that was your refering to? i'll see if i can find a pic.. probbly tough to do.. not many jugs running around with that type port added in..

 

[370]

heres is a pic of the "dizzy ports" with the sleeve removed.. that what your speaking of? of course the sleeve would seal these off on the inside..

 

[370]

that jug actaully has both boysen and dizzy ports.. the boysens go into the bottom of the transfer tunnel and the dizzys go into the trans. tunnel right at the port opening.. but they perfrom 2 different tasks..

 

[lassek]

I cant see the picture? Link broken ?

 

[370]

no.. problem is the pic is linked to a vbulliten site.. newer version of vB don't let nonmembers view linked pics.. i'll try saving and reposting

 

[Kennedy_Power]

Didn’t we just have this conversation last week Chris (370), like Thursday....
Intake velocity and the exhaust pipe scavenging at bottom dead center are critical to big power gains. Large intake windows can and will hurt power from the slower intake charge velocity.
Do your research before adding holes and making your intake port large, while leaving the exhaust port small.

 

[370]

yeah it wasnt very long ago we had that conversation.. thats why it was fresh in my mind when this topic came up.. i think alot of people tend to "overport" the intake side.. and get scared on the exhaust side.. alot of the cylinders i've checked out seem to have very large intake windows and boysens.. but then the ex. port is narrow. and somtimes short too. i've never understood why some people keep ratehr conservatinve ex port durations and VERY conservative ex. port width.. but then go HOG WILD on the intake box.. kinda like when you see transfer durations at 132 but the trans tunnel is untouched... it's thing that just don't make alot of sense... i was told porting is based on fluid dynamics.. but seems to me some of this is common sense... maybe i'm smarter than i thought... hahaha and people say bricklayers are idiots..

 

[lassek]

Hehehe .. you make me feel bad inside.. i ported my intake fairly big?

I did some on the exhaust.. but NOT very much, the reason actully was that i have heard that piston and ring wear out very fast the larger the exhaust is.. specially wider..


Also i cleaned up transfers perfectly of corse.. But my plan is IF the cyl is coming of again someday .. I will make the exhaust bigger..


BUT I must say.. it runs like a dream ! nothing there..

 

[370]

people get scared about exhaust width.. the key is the radius leading into and out of the port. if you give it a nice radius the bring the ring in.. it'll last longer than you think...