Author Topic: Plunger frame Airbox - possible production  (Read 1955 times)

Offline a

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Re: Plunger frame Airbox - possible production
« Reply #30 on: 29.01. 2018 06:18 »
They at slightly different in shape, and use a different filter/filter plate.I have a genuine filter plate for one of those here with filter in it.
https://mikesclassiccyclespares.com/product/67-4545/

If you look at our site You'll see we previously had the other type (plunger)  as well (now sold), but if you look you'll see the differences in shape etc. https://mikesclassiccyclespares.com/product/67-4600/

Offline a

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Re: Plunger frame Airbox - possible production
« Reply #31 on: 29.01. 2018 06:43 »
I'm very pleased that my bike still had those bits on it. I just needed to buy the shiny battery strap and bolt arrangement.


I can imagine someone using a good filter case to make a mould to then create new GRP filter cases. The other parts could be fabricated from flat stock.
We have that strap, and bolt arrangement....
https://mikesclassiccyclespares.com/product/29-4657/

Online chaterlea25

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Re: Plunger frame Airbox - possible production
« Reply #32 on: 29.01. 2018 21:26 »
Hi All
(duplicate post  *conf*)

Recently I have bought some replica vintage BSA parts from a chap in Czech Republic who sells them on eBay
his eBay name is   joseph60.7771
I have to say his parts are 100% and very good value
It might be worth contacting him with a view to getting the replica's made ???

John
1961 Super Rocket
1963 RGS (ongoing)

Offline a

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Re: Plunger frame Airbox - possible production
« Reply #33 on: 30.01. 2018 03:40 »
Just made some Air filter element plates if anyone is interested... Replaces item 67-4600 I'll be listing them on our website in the next few days.
https://www.facebook.com/mikesclassics/posts/1688826421140732

Offline Richard A

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Re: Plunger frame Airbox - possible production
« Reply #34 on: 11.02. 2018 12:51 »
Hi,

Just ordered the air filter plate from MikesClassicCycleSpares, so hopefully one part less to search for.
Nice if you made the filter box too!

I've also found someone local to me prepared to do the 3D drawings so will see how that one goes as feed into someone who can then fabricate the part..

Richard

Online Simon59

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Re: Plunger frame Airbox - possible production
« Reply #35 on: 11.02. 2018 16:18 »
Just dismantled the airbox on my '54 plunger and was pleasantly surprised to find everything there. If anyone wants me to take some measurements, more photo's or even borrow the part to measure/fabricate a replacement, please let me know. I'll be powder blasting it clean in a week or two and it looks good with no rust, etc. I won't be painting it for a while yet...

By the way I have found an 'engineering blacksmith' near to where I work (Warrington) who has done a great job recovering my front mudguard.  If anyone needs some similar welding/grinding/straightening work, I can recommend him, but I'm not sure of the etiquette of such things on the forum. He has a degree in metallurgy, a workshop to die for and charges £40 per hour. 
Restoring a 1954 plunger framed A10 Golden Flash

Online Sluggo

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Re: Plunger frame Airbox - possible production
« Reply #36 on: 14.02. 2018 23:56 »
If its in good nick, then by all means post up in the appropriate section (Tech) as this is the for sale section,
But take some good photos from several angles and orientation of the parts, measure what you can (especially the mount brackets) and try to make a "Blueprint" of it to illustrate it.  If good enough one could make new ones from it.  (Parts are only as good as the print).  I have manuf sources but what they ask for now is 3d scans, as that is the final word in manuf these days.
But the reality is, you can only approximate a reverse engineered part if you dont have an example in your hand.  (Close enough is good enough)  There is 2 things to remember when dealing with 60-70 year old parts,, most were wildly inconsistent to begin with. (Show me 10 Norton Featherbed frames and Ill show you 10 different layouts on a jig).  #2 unless its new out of the box, its probable that it could be modified, tweaked or different slightly than the identical bike parked next to it, Not to mention parts bin engineering where stuff was changed mid stream in production.

As i said, this is a very low production endeavor, and very low demand but I will be producing some other hard to find parts in the next 12 months, and not  a big deal to add this to the "To-do" list. 
My other airbox project is some Q racing air boxs.  I have 2 examples and there is decent demand for them.  Currently working on some modern machinery airboxs/filtration and slow going with some of the testing.
Remember that any advice received on a free internet forum is generally worth about 1/2 of what you paid for it.
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Online Greybeard

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Re: Plunger frame Airbox - possible production
« Reply #37 on: 15.02. 2018 11:07 »
I know that Plunger A10 and A7 air filter rubber connector hoses are different so are filter back plates also different?

Online muskrat

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Re: Plunger frame Airbox - possible production
« Reply #38 on: 15.02. 2018 18:54 »
No GB. The A10 is longer in the stroke so the head sits 1/2" higher in the frame than the A7 hence the need for different rubbers (ribbed or plain  *shh*)
Cheers
'51 A7 plunger, '57 A7SS now A10CR, '76 XT500, '77 AG175 '83 CB1100F, '81 CB900F project.
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Muskys Plunger A7

Online duTch

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Re: Plunger frame Airbox - possible production
« Reply #39 on: 15.02. 2018 21:48 »

 
Quote
I know that Plunger A10 and A7 air filter rubber connector hoses are different so are filter back plates also different?

 As ^^above^^, and all components have same part #'s for A7,A10 7 Star Twin
Started building in about 1977/8 a on average '52 A10 -built from bits 'n pieces never resto intended -maybe 'personalised'
Have a '74 850T Moto Guzzi since '92-best thing I ever bought doesn't need a kickstart 'cos it bump starts sooooooooo(mostly) easy
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Offline a

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Re: Plunger frame Airbox - possible production
« Reply #40 on: 18.02. 2019 06:14 »
We may have another of these, complete with filter (all in used condition), possibly next week. Just seeing if anyone here needs it before it gets advertised...