91 replies to this topic

[rjf7]

Do you mount the filters to the throttle bodies and slide the plastic hickey over the foam, or do you have to put the filters through the plastic and then to the throttle bodies? Thanks, RJ.

[BankBuster]

I got a pair of Unifilters, part number UP-4245 for $40 (included shipping to Canada) from rangelec@lcp2.net.

You can Google the part number for a better pic of just the filters. Simply remove the air box and split it (flat screw driver on the tabs) and gut it of the divider and horns. Remove the rubber donuts that go onto the throttle bodies and the Unifilter will slide nicely through the plate. Then use the Doo clamps as they are slightly thinner and work great to hold the filter and air box plate onto the throttle bodies. Then flatten one filter at a time and slide the box over the filters and back in place. That should help keep the belt cr@p out of the engine,,, I just put in a reman crank do to inner bearing gone,,, Note they should already have oil, and I still use a gutted outer airbox with a screen kit from RM Products to get as much cold air into the out box as possible,,

Here's a pic of what it will look like when you peak into the hole in the air box

Attached Files

•  UniFilter1_small_.jpg   68.69K   88 downloads

[1Gunner]

Step by step of my filter install:
air box showing the seam that splits apart:
 1.jpg   92.17K   92 downloads
This shows the tray you need to remove:
 2.jpg   96.73K   79 downloads

[1Gunner]

I heated the seam and used a bent screwdriver to lightly pry open :
 3.jpg   74.45K   50 downloads

Separated:
 4.jpg   83.14K   45 downloads

[1Gunner]

Remove these items:
 5.jpg   103.23K   49 downloads
Remove the rubber donut and insert the Uni Filter, as BankBuster said using the BRP clamp because it's much thinner.
 7.jpg   87.45K   47 downloads

[1Gunner]

Size comparison of the two clamps:
 8.jpg   60.15K   42 downloads

My throttle bodies were in pretty good shape:

 6.jpg   108.87K   46 downloads

[1Gunner]

Make sure you offset the clamps before installing filters:

 9.jpg   97.35K   46 downloads

Installed, I found using a bit of silicon spray on the rubber boot made for an easier insertion :
 92.jpg   100.75K   46 downloads

[1Gunner]

Not a very good shot, but they're in there!! It's a bit of a contortionist act getting the box on, but be patient. I found the first was pretty easy, but to clear the mag side filter I reached over top the motor with my left hand, with PTO plug wire unplugged, and collapsed it while pushing the box into it's final position with my right hand.... simple!!

 93.jpg   146.65K   48 downloads

[rjf7]

Thats great. I do much better when I can see pictures. Thanks Gunner.

[SkiDozer]

Thats great. I do much better when I can see pictures. Thanks Gunner.

Thank you, Gunner.

Quick question... the BRP clamp..is that already on the box or is that something you buy ahead of time?

Dozer

[1Gunner]

Thank you, Gunner.

Quick question... the BRP clamp..is that already on the box or is that something you buy ahead of time?

Dozer

They hold the rubber donuts onto the throttle bodies
 donut1.jpg   85.2K   63 downloads

This shows the top of one BRP clamp one after I took off the plate
 donut.jpg   70.43K   61 downloads

[BankBuster]

man that sled is clean
G.J. on the post,

[Soon to doo]

Wery good instructions, thanks.

I got 4 of those filters just waiting to be installed.
(two extra for sale in Sweden)

One thing that I see as a performance potential here,
is that the bellmouths (donuts) are left out.

A bellemout increase the airflow in to a pipe (throttle body)
by as much as 10% compered to a square cut off pipe.
I am going to take the plastic off of the UNI filter, and glue the
filter foam over the edge of the bellmouth.
I will then have;
Gutted airbox = no inlet restriction
Bellmouths still installed = make use of the extra airflow potencial of the gutted airbox.
UNI filter guarding my motor.

I wonder if the explanation to why there is no performance gain with
this mod, even with the gutted air box, is due the the bellmoth missing thing.

I am sure of it.

//

[nerf]

Thank's 1Gunner.Pic's worth 1000 words.I tow do better with pic's. Nerf

[BlueMax]

Wery good instructions, thanks.

I got 4 of those filters just waiting to be installed.
(two extra for sale in Sweden)

One thing that I see as a performance potential here,
is that the bellmouths (donuts) are left out.

A bellemout increase the airflow in to a pipe (throttle body)
by as much as 10% compered to a square cut off pipe.
I am going to take the plastic off of the UNI filter, and glue the
filter foam over the edge of the bellmouth.
I will then have;
Gutted airbox = no inlet restriction
Bellmouths still installed = make use of the extra airflow potencial of the gutted airbox.
UNI filter guarding my motor.

I wonder if the explanation to why there is no performance gain with
this mod, even with the gutted air box, is due the the bellmoth missing thing.

I am sure of it.

//

Here's a thought or two. Yes the velocity stack type intake does increase airflow considerably. Why doesn't the Uni-filter installation change airflow as currently used???? Maybe you should look further down the intake tract for the true airflow limiter. Also, it is typical for the 2 stroke engine designer to alter the intake box dimensions to resonate at given RPMs which can actually boost airflow. This resonant boost effect will not be seen when intakes are hooked to an airflow bench. The additional airflow at these resonant RPMs is compensated in the factory fuel curve. Just another reason why it is so difficult to get large gains with typical engine mods. One of the secrets was released at the Old Forge shootout the last year the Mach Z competed. It went unnoticed by many of the Mach owners.

The history of the Mach Z 1000 SDI engine and peripheral components explains why certain mapping changes were made and why. The engine was designed for maximum performance and reliability first and then it had to pass both environmental and noise regulations. Figure out what was added last or changed and you will have a key to additional performance.