aluminum velocity stacks

[nastyjones]

Greetings all,

I have inherited a set of velocity stacks for my 80-1100. They have the wire screen on them but what they don't have is any foam or other filtering device. I think it would be a good idea to put something in them to slow down the flow and was thinking of that foam you get for your Briggs and Stratton lawn mower air filter. What do you think, should I filter them and what other kinds of foam might work?

Paul

[Agemax]

whats the point in fitting velocity stacks if you are gonna stuff a filter in them? thats the whole idea of stacks.....maximum air flow. if you aren't happy to use them then try k&n pod filters instead

[Baatfam]

NJ, I use velocity stacks on my drag bike, but I would never run them on the street...
They look cool, and pass a lot of air, but there is just to much crude flyin' around out on the road...
No telling what you could suck in....

You can get a good set of pods for not too much money...

[hampshirehog]

I'd disagree slightly with Baatfam. If you live in an area that isn't too dry and dusty you won't be putting your bike in much more risk. The gauze will stop catastrophic particles entering and you should only slightly increase engine wear if at all. (Though, like I said, it depends on where you live).

As examples, my A65 has had bellmouths on for 30,000 miles (at least) and is still on original bore. Similarly my mate's A10 has knocked up over 75k miles and is fine. I've also run GSs on bellmouths with no problems (but sold them before clocking up '000s of miles).

I agree with Agemax - no point in stuffing foam in there - you might as well get pods.

One other thing with bellmouths - on windy days you may well notice a fluctuating tickover. This is very noticeable on my mate's A10 - makes him look like a 17-year-old revving his bike at the lights!

[pontiacstogo]

I run open stacks on one of my bikes and plan to on the Kat as well.

It's hard to beat the sound of stacks on direct lift carbs at WOT.

[hp1000s]

whats the point in fitting velocity stacks if you are gonna stuff a filter in them? thats the whole idea of stacks.....maximum air flow. if you aren't happy to use them then try k&n pod filters instead

...exactly.....

[Baatfam]

I'd disagree slightly with Baatfam. If you live in an area that isn't too dry and dusty you won't be putting your bike in much more risk. The gauze will stop catastrophic particles entering and you should only slightly increase engine wear if at all. (Though, like I said, it depends on where you live).

Good point! I was thinking only of where I live.
We have constant road construction going on, so gravel, concrete dust, sand and all sorts of nasty things fly around.

Thinking back, I did run a set on an Austin Healey I had years ago with no ill effect.

[hp1000s]

...exactly.....

Hope this photo-post works!

[nastyjones]

So hp1000s. Do you have any filters in yours?

[hp1000s]

Negative, I have some bugs/dust and what-not in my riding area, but roads & highways are reasonably clean. This one isn't a daily driver; I prefer the look for this bike. The bike was raced back in the day, and has open exhaust, so intake noise isn't an issue...sorry to all the quiet-exhaust guys. The bike was basically always like this(since 1980), so I wasn't about to change it. Quiet can be nice as well, but not for this particular one.

[Mysuzyq]

Looks good! What rear tire on that S?
Tony.

[hp1000s]

Looks good! What rear tire on that S?
Tony.

Thanks...it's a Pirelli Sport Demon 130/18