Air Cleaners for larger builds

[VDeuce]

Looking for input on AC choices for M8 larger build engines with displacement of 120" and up, with ported heads and larger throttle bodies. Stage I AC is not going to cut it.

One's I've heard recommended are:

    - Trask Assualt
    - SE Heavy Breather
    - T-Man No Loss
    - Ness Big Sucker (may not flow as others)

Any other ones I'm missing?

The Trask is nice, but expensive and I'm not crazy about the clear look.

[turboprop]

Looking for input on AC choices for M8 larger build engines with displacement of 120" and up, with ported heads and larger throttle bodies. Stage I AC is not going to cut it.

One's I've heard recommended are:

    - Trask Assualt
    - SE Heavy Breather
    - T-Man No Loss
    - Ness Big Sucker (may not flow as others)

Any other ones I'm missing?

The Trask is nice, but expensive and I'm not crazy about the clear look.

The M8 uses the same air cleaner as the twin cam. Just about every air cleaner for the twin cam is in play. Zippers offers several big air cleaners as do several other companies. Broaden your search.

[Johnwesley]

K&n has a good air cleaner that seems to work well. FM has a Dyno with it and pulled some decent power

[les]

Check the Horsepower Inc. site.  Their air filters are some of the best I've personally seen and used.

[BigT]

The M8 does not use the same air cleaner as the Twin Cam the back plate that mounts to the throttle body has a different bolt pattern

[Breeze]

I wonder why air filters for 400+ cubic inch cars and trucks are not 4 times the size of Harley filters?  Could it be that they don't need to be huge to satisfy the demand?  I know shape of the assembly is important.

[BigT]

I just went thru this same process of looking for an air cleaner for my 117" build. The Horsepower inc air cleaner looked like it would flow more than enough air but sticks out pretty far. The TMan filter is big bucks and didn't care for the looks. I ended up using a K&N HD-0910 air cleaner, a backplate from a M8 CVO, and a HD Ventilator cover for a Twincam. When I get it tuned in a couple of weeks I will have a pull done without the air cleaner to see if it is too restrictive.

[crusinmann]

I did the same thing and cut bottom tab off too.

[crusinmann]

I wonder why air filters for 400+ cubic inch cars and trucks are not 4 times the size of Harley filters?  Could it be that they don't need to be huge to satisfy the demand?  I know shape of the assembly is important.

Same goes for exhaust pipes on cars with over 300 cu in and 400hp using 2-1/2 dual exhaust .Then on Harleys guys putting on pipes with 2-1/4 and 2-1/2 baffles on a 117 cu engine. Maybe physics is different on Harleys

[VDeuce]

So do the M8 ACs protrude out farther than on a Twin Cam? I've run large filters on Twin Cams (R&R Racing's Overflow AC) and while it did touch my leg depending on foot position, it never bothered me.

[PoorUB]

I wonder why air filters for 400+ cubic inch cars and trucks are not 4 times the size of Harley filters?  Could it be that they don't need to be huge to satisfy the demand?  I know shape of the assembly is important.

They aren't??
The filter for my 435 HP Ford and my wife's 300 HP Trail blazer is easily 4 times the size of the stock HD filter.

[PoorUB]

I wonder why air filters for 400+ cubic inch cars and trucks are not 4 times the size of Harley filters?  Could it be that they don't need to be huge to satisfy the demand?  I know shape of the assembly is important.

Same goes for exhaust pipes on cars with over 300 cu in and 400hp using 2-1/2 dual exhaust .Then on Harleys guys putting on pipes with 2-1/4 and 2-1/2 baffles on a 117 cu engine. Maybe physics is different on Harleys

Back in the days if you were running a 454 big block you would be running 2" primarys for header tubing.

[crusinmann]

Into a 4" collector down to a 2-1/2 pipe  some mufflers are 2-1/2 in and 2-1/4 out .   Same as 2-1 pipes its about velocity . Looking for pure 7k rpm hp a piece of 8" straight pipe will work. All depends on what you're after .

[bxbutch]

Will the k&n hd-0910 fit in a 2018 114 flhcs Thanks Butch

[BigT]

Will the k&n hd-0910 fit in a 2018 114 flhcs Thanks Butch

It fits into the back plate but you would have to redrill the holes where the air cleaner mounts to the back plate. You would also need a different cover from a Twin Cam ventilator style air cleaner.