G26ei-do i need the veloscity stack ?
 

I just mounted my g26 ei on my Fw190 71" span bird . Do I need to use the Velosity stack , do I lose power by not useing it ??
I hate to cut a hole in my cowl for it to extend out .

RE: G26ei-do i need the veloscity stack ?
 

Absolutely, maybe.
V-stacks are part black magic. Some times it runs much better some time it runs worse.
It you plane shows fuel/oil dribbles on the carb side then most likely the answer is yes you need a v-stack.

RE: G26ei-do i need the veloscity stack ?
 

what does it do ???

RE: G26ei-do i need the veloscity stack ?
 

The prop blast moving over the carb opening can create a vacuum effect (venturi). Using a velocity stack will decrease this effect. Seeing fuel dribbling out of the carb is a sign that raw fuel is being siphoned out of the carb by the venturi effect. The effect of this is obvious.
However, sometimes this doesn't happen. I have one 26 cc gasser with a V-stack, and my G23 runs perfect without one.
BTW, you will usuall get the best effect from the V-stack with the opening angled back, away from the prop (at least to some degree, if your v-stack has an angled opening).

RE: G26ei-do i need the veloscity stack ?
 

My Vstack is perfactly circular , in addition , my application is in a Fw190 cowl , the prop blast would be buffered by the front of the cowl rim , possibly totally buffered based on the blast going both internally thru the cowl and outside the cowl past the carb.
Assuming it was designed by greater minds , I guess my best bet is to cut an opening for it , use it and see how the engine performs .

RE: G26ei-do i need the veloscity stack ?
 

Why not use it without cutting the cowl first and see if it works. No sense cutting the cowl unless it is really needed. I've got a G26 mounting in a Pacific Aeromodels Monocoupe with no velocity stack and the engine runs fine. The carb is totally within the cowl.

RE: G26ei-do i need the veloscity stack ?
 

Deja Vu [:-], weird, I just told someone that same thing the other day. Just not about the Moncoupe :D

RE: G26ei-do i need the veloscity stack ?
 

Good suggestions I guess being new to gas I was concerned about not haveing a good eye for "how it runs" , expert at glow both two and 4 stroke , gas was always a mystery to me and I am taking a jump with the G26ei .
I am hopeing to have an easy transition so I can keep going with gas engines