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Monza air filtration

Posted: Sun May 06, 2012 8:21 pm
by averydad
Hello again,
Thanks to all for the advise on rims for my bike.
My next issue is air filtration for my `67 Monza with the square style body work. The stock set up uses a rubber hose from the carb to the air box. I can not find a replacement for this part.
I`ve found listings for the scrambler but not Monza. Can the scrambler part be used on my Monza ?
Any ideas for a good alternative ? Is there a K&N cone type filter that will fit with out fouling the frame or side cover ?
I bought a trumpet to fit my carb but the more I think about it the more I think I`d rather run a proper filter, or at least a sock on the trumpet.
Any ideas would be most welcome.
Thanks,
Rick

Re: Monza air filtration

Posted: Tue May 08, 2012 12:27 am
by JimF
I had an early widecase 450 that had a filter in the sidebox. I found a straight cylindrical K&N that almost fit; it had a small flange that I had to mill off, and I had to drill a hole in the center of the top to allow the center post to pass through for wingnut attachment. I just looked in the garage hoping that I had thought to save the box or at least the flap with the part number, but sadly I did not.

I believe it came from the"Round Straight Universal" porduct line. I think you can search by diameter and height.

Were you also asking about the air tube? I may have an old one for the widecase I could give you - at the very least you could see if it fits.

Jim

Re: Monza air filtration

Posted: Sat May 12, 2012 5:55 pm
by averydad
Jim, I`m looking for either the air tube that will allow me to use the original air box set up.
Or... a clamp on pod or sock type filter that will clamp on my UB carb and not foul the frame or side box.
If you think the 450 hose will work I`d give it a try.
Thanks

Re: Monza air filtration

Posted: Sat May 12, 2012 6:18 pm
by JimF
Here is what it looks like - it connects the 450's carb inlet to the airbox.

Do you think you can use it? It's yours if you think it will work.

Jim

Re: Monza air filtration

Posted: Sun May 13, 2012 12:58 pm
by averydad
Jim, It looks like I`d have to cut it down but it might work. My carb outlet is 40mm. I guess I could shim it out with a piece of rubber if needed.
Whats the inside of the hose measure ?
Thanks

Re: Monza air filtration

Posted: Sun May 13, 2012 1:17 pm
by JimF
The inlet of the hose is about 1.40" inside diameter. The bellows length is 6" not including the elbow and the airbox oval which adds another 4".

PM me with your delivery address information and I will send it to you tomorrow morning.

Jim

Intake Connector-hosing Fitment-issues

Posted: Mon May 14, 2012 2:08 am
by DewCatTea-Bob
" It looks like I`d have to cut it down but it might work. "

____ Right, and for fitting to a stock Monza setup, it certainly won't work without further fooling-around !
And in my opinion, it would be a certain shame to destroy a good-usable/stock 450-Scr intake-hose in an (uncertain) attempt to make it somehow work for an otherwise stock Monza. _ And unless you're willing to accept a cobbled-up (& likely leaky) setup-affair for your Mona, it would be better to go to an auto-shop & try finding some suitably sized radiator-hose to try accomplishing the same function (about as well).
__ It's been over a couple decades (if ever), since I've had both the 450-Scr and Monza intake connector-hoses in my possession at the same time but, I have the impression that the O.D. of the 450-hose is slightly larger (maybe 3 to 5mm, if I'm right about that), than that of the Monza's. _ So before-hand, I suggest that the smaller-O.D. -(as the pleated rubber-hosing obviously has it's min. & max. OD.s), of the 450-hose be checked to see if it will even possibly fit-into the I.D. of the air-outlet opening-hole in the Monza's air-filter/side-cover. _ Cuz otherwise, the filter-cover's outlet-hole may need to be slightly enlarged in order to prevent the rubber-hosing's O.D. from being pinched & wrinkled (causing at least one air-gap leak).
Even with the Monza's original/stock intake connector-hose, it was still somewhat of an issue to fit the opening-end of the rubber-hosing into the air-filter/side-cover's air-outlet hole without any pinched-wrinkles left developed between the hose & air-outlet opening/hole,, which then allowed some more-probable air-leakage. _ Only when that stock rubber-hosing was new & unused, would it then fit nice & properly.
____ In the past, (if I really cared about good/complete air-filtering on a Monza), I'd then use a Dellorto air-filter from another Italian-bike's carb.filter setup. ...
Back in the late '60s, there were many different Italian-bikes with such varying air-filter setups, to borrow from for such deficient Duke-models.
A couple years back, I sold one of the last of such I had to a fellow-member here (Tony),, (it would be nice to see a picture of Tony's Duke-project of which he must've finally fitted it to !).
I've posted (below) a couple pix of the very-same filter-body (with Scr.type cover), which I sold to him,, (as well as a picture showing a Dellorto-carb fitted with an other/smaller type of filter-body).
__ You could try searching eBay for Dellorto-made filter-bodies made for various smaller Italian-motorcycles such as those built by Benelli, Guzzi, Laverda, H.D.Sprint, etc., etc.
Here's a link to such an example (which I believe is just-like the one pictured in my 2nd/center posted-pic, [except without the Scr.type cover])... http://www.ebay.com/itm/NOS-Indian-Dell ... 05&vxp=mtr ,
and here's another link to another example (which I think may possibly be similar to the filter-body fitted to the D.carb pictured within my 1st/top posted-pic)... http://www.ebay.com/itm/Dellorto-SHA-Ai ... e9&vxp=mtr , whether or not THIS-one's threaded mounting-hole is large enough to fit your Dellorto-model, should be inquired of (since it MAY be too small).
No-doubt there are others to be found on eBay (later if not today).
The mounting-hole for all THESE filter-bodies is smaller than that made for fitment to the 27 & 29mm SSI-carbs of the Scrambler-models, and therefore are not interchangeable.

____ Hope this helps you make the best decision !


Hopeful-Cheers,
DCT-Bob

Re: Monza air filtration

Posted: Tue May 15, 2012 2:20 pm
by averydad
Thanks for the great info Bob,
My bike came with a K&N style cone shaped filter 3" wide at the bottom and 2" at the top and about 3" tall plus the flange.
It fouls the frame and looks all wrong.( see photo ). It seems like the original rubber inlet hose is unavailable so your idea of a smaller screw on Dellorto filter seems the way to go. I know many run with only an open velocity stack but that makes me uncomfotable.
I`ll take a look at the hose Jim is sending me and If it`s in good shape and won`t work for my Monza ....then I`ll return it or pass it on to some one who can use it.
Thanks again,
Rick

Re: Monza air filtration

Posted: Tue May 15, 2012 6:07 pm
by DewCatTea-Bob
" Thanks for the great info Bob, "

____ Of-course you're welcome Rick,
I'm just sorry that I didn't get to responding to your post sooner !



" It seems like the original rubber inlet hose is unavailable "

____ Even if you found a used one from a Monza,, you'd find it to have become so hard & unflexible, that you'd thus not be able to get it properly fitted into it's expected location !



" I`ll take a look at the hose Jim is sending me "

____ Well before you do anything else with it, first measure it's (smaller) outer-diameter size,
then compare that measurement with the diameter of the outlet-opening/hole in your Monza's side-cover,, so as to figure if the 450-Scr.hose will even fit.
If the air-hose is still fairly flexible (where it's expected to fit within the outlet-hole), and is only about 1mm larger than the side-cover's outlet-hole,, then it could work (as far as THAT issue is concerned). - (I'm interested to learn if I'm right about that 450-hose being a little too fat to fit, without getting pinched out of shape & thus allowing a winkle for air leakage.)
Anyhow, even if there turns-out to be a good-fit at the side-cover end, you'll likely still have to do some cobbling at the carb.inlet end (to get a worthy air-seal fit) !



" and If it`s in good shape and won`t work for my Monza ....
pass it on to some one who can use it. "

____ That's nice of you of-course, and in the continued spirit I'm sure Jim would appreciate.



Hopeful-Cheers,
-Bob

Re: Monza air filtration

Posted: Mon May 21, 2012 3:18 am
by averydad
Well... as Bob had guessed the 450 hose is not going to be much good on my Monza. Now I`m thinking of going another direction. I`m curous to know your thoughts on running a velocity stack or trumpet. I`m new to Italian singles and I am surprised to see how many run with an open intake. Many of the factory pictures show no air filter. While this looks really cool, I`ve always run with factory air box or pod filters on my vintage Hondas, BMWs and such. Perhaps a trumpet with a simple screen is the answer. I plan to ride only maybe 500 miles a year max. I only drive on paved roads and in nice weather. Any issues to watch or advise you can share is most welcome !
Thanks in advance.
Rick