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PostPosted: Fri Dec 25, 2020 4:35 am 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
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I have repaired many this way, using Pirtek MPH 06 hose. I used to keep the hydro barb at the pipe connection, however they are less secure than a brass 3/8 BSP tail. I drill the 5/8 UNF hydro flare nut to 13mm to fit the tail.
I used to get Pirtek to crimp the hoses, but now use 2 Oetiker circle clamps each end.
I tap the bag 1/8 BSP x 3/8" deep, and fit a SS nipple and 1/8 x 3/8 reducing bush, Loctite 262 the fittings. Hose has a 3/8 dia x 3/8 BSP brass nut and tail. I have also used 3/8 dia x 1/4 BSP nut and tail.

Old bags that have dried out over the years are less successful, some crack through the rubber cone at the top. Bags should be stored with glycol antifreeze in them.


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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


Last edited by drmini in aust on Fri Dec 25, 2020 10:33 am, edited 1 time in total.

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PostPosted: Fri Dec 25, 2020 6:56 am 
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Location: near Baulkham Hills, NSW
Fritzie wrote:
What would be suitable to coat the outside rubber surface? It is probably something we should be doing to our bags on the car as well.


Other rubber goods are often stored long term in a bag with talcum powder in it, I bought a serpentine drive belt packed this way.
On car though, it's really just the dust boot that hardens and can crack eventually. But this takes many years. New boots are still available.

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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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PostPosted: Mon Mar 22, 2021 4:01 am 
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Joined: Fri Mar 19, 2004 6:19 pm
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Location: near Baulkham Hills, NSW
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I now keep the original barb on the bag by carefully cutting the crimp off with a die grinder.
I then use Pirtek MPH06 hose with 2 Oetiker full circle clamps on both ends.
Tested fine at 300 psi.
I made an offset crimper from a big pair of pliers but you can buy them on eBay.

The Pirtek brass crimp in the top picture looks pretty but it's very thin, i have had one leak when using the original hose end barb. But OK with a 3/8 brass barb fitting.
Use with either the original steel 5/8 UNF nut or a brass oxy hose nut.


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DrMini- 1970 wasaMatic 1360, Mk1S crank, 86.6HP (ATW) =~125 @ crank, 45 Dellorto (38 chokes), RE282 sprint cam, 1.5 rockers, 11.0:1 C/R. :mrgreen:


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