I've seen pictures of a couple Impacts with that thing hanging down where the reg gage used to be. I would like to know first what it does and second if it does something neat, where can I get one?
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Plenum Extender on Impact
- Thread starter dannyshoots
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It is a plenum "enlarger", similar to the larger plenum that comes standard on the MKII. It increases the volume for more power at lower regulator pressures. You can get one from Ernest at FX.
Stoti
Stoti
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Imo it looks ugly having a large tube extend down so far. I rather have the larger plenum on the mk2 so you won't see it. I email fx USA asking for the price of the new mk2 plenum. Hopes its not too expensive or too hard to install myself.
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It is a very inefficient way of increasing the plenum. The flow from the extender towards the actual plenum is rather low/quite obstructed due to the small port you can use inside the 1/8 BSP thread of the gauge hole. This means you will need a lot of extra plenum volume for little increase in power. Getting a bigger plenum tube like the impact MKII has is a much better idea and will bring you probably the same power with a smaller plenum growth since the flow of the extra volume isn't obstructed as much.
An idea for a better solution in my opinion would be to widen the plenum space near the valve, which would mean widening the breech block (a.k.a. making a new one), since this is the most direct path available in this setup which will lead to the best flow and thus the most efficient volume increase and corresponding power increase.
An idea for a better solution in my opinion would be to widen the plenum space near the valve, which would mean widening the breech block (a.k.a. making a new one), since this is the most direct path available in this setup which will lead to the best flow and thus the most efficient volume increase and corresponding power increase.
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for sure!, but also is the easy way to do it (and it works as is, and better if you mill the "delrin holder" that one is the main restrictor), without milling anything and the larger valvetube of the mk2 is not available (unless you make it) and the VT is not that big (OD change from 19.75 to 23.15mm)
But if you are not afraid to mill, you can do it
(Borrowed pic from ER)
Upvote 0
for sure!, but also is the easy way to do it (and it works as is, and better if you mill the "delrin holder" that one is the main restrictor), without milling anything and the larger valvetube of the mk2 is not available (unless you make it) and the VT is not that big (OD change from 19.75 to 23.15mm)
But if you are not afraid to mill, you can do it
(Borrowed pic from ER)
That's indeed a way to go to make it work
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