andyharding
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| posted on 2/8/07 at 08:28 AM |
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Bogg Bros Carb Rubber Warning
I have a Bogg Bros R1 Carb conversion on my Pinto.
A few months ago when I had the carbs off for another job I noticed the inside of the rubber tubes was breaking up. I phoned Bogg Bros and they
insisted this was a one-off and sent me a free set of new rubbers which I duly fitted.
I was blasting along last night when they engine died with a large clatter. I was stranded down a little country lane, miles from a town and with no
mobile phone signal or light.
Thankfully, my passenger knew the local vicar who we woke up and got him to bring us a torch and some tools.
Upon inspection the carbs had fallen off! This was caused by the rubber tubes breaking down again. I managed to get them back on again and today will
go in search some new petrol proof hose.
So... if you have a Bogg Bros conversion with the green rubber tubes... then check your rubbers for tears or you could get in trouble (stop laughing
at the back) 
[Edited on 2/8/07 by andyharding]
Are you a Mac user or a retard?
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donut
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| posted on 2/8/07 at 08:32 AM |
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Andy
When I die, I want to go peacefully like my Grandfather did, in his sleep -- not screaming, like the passengers in his car.
http://www.flickr.com/photos/andywest1/
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novacaine
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| posted on 2/8/07 at 08:35 AM |
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quote:
Originally posted by andyharding
free set of new rubbers
ide be rather disgruntled if they sent me used rubbers
sorry it had to be said, im immature
And you run and you run to catch up with the sun but its sinking, Racing around to come up behind you again, the sun is the same in a relative way but
your older, shorter of breath and one day closer to death
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coozer
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| posted on 2/8/07 at 08:45 AM |
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Good advice indeed.
Its niggled away at me for a bit after hearing some other people having trouble keeping the carbs on. For this very worrying reason I've
configured mine to use the original bike inlet rubbers.
[Edited on 2/8/07 by coozer]
1972 V8 Jago
1980 Z750
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indykid
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| posted on 2/8/07 at 08:47 AM |
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i noticed that the inside of the hose was starting to bubble a little bit on mine when i had my blade carbs off to fix a siezed idle adjuster screw.
it needed fixing because they'd sent the carbs back to me after they'd snapped half the head off and left it.
the manifolds are pretty, but thats as far as i'll go for the quality of their work.
tom
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Pdlewis
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| posted on 2/8/07 at 08:47 AM |
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Its somthing thats also been playing on my mind. Could you let us know what you change to?
Cheers
Paul
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DarrenW
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| posted on 2/8/07 at 09:17 AM |
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Very interesting. Anyone know what that green Boggs hose is (material wise?). Im planning to use silicon hose which isnt known for its fuel
resistance, however my fuzzy logic was that the carb mouth and manifold are close together and its not running liquid fuel that is passing through
anyway (oh yes - im trying to convince myself!!).
Paul - as said on U2U the hose i gave you is industrial rad hose (markings on hose are ALFAGOMMA-Italy, T-352 Radiator DIN 73411 - 48mm). I have seen
others use it but no idea how long it will last.
Andy - do you think the hose perishing led to the carbs falling off? Was there evidence that the fuel had worked its way back up to where it is
clamped and softened it? I am awaiting my boggs manifold at the mo and was hoping the way they machine the ends of the tubes would stop that
happening.
If it is a generic issue with that particular hose then i guess we can expect to hear some confirmations from other owners.
Sounds like Steve (Coozer) has a good plan.
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DarrenW
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| posted on 2/8/07 at 09:30 AM |
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Try google search for
T352 Radiator DIN 73411
You will find an alfagomma pdf file to download. Pg70 is the hose i gave to Paul (EPDM). Pg 108 to 125 are specialist fuel hoses.
Only ID 48mm i could see was T-605AA. Some are quite thick, i would say anything over a 5mm wall may be tricky to fit.
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viatron
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| posted on 2/8/07 at 09:50 AM |
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just had my 3rd manifold from Bogg Bros and the most recent has come complete with original rubber joiners and the ends of the manifold tubes have the
grooves machined into them to lock the rubbers in place.
Mac
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MikeR
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| posted on 2/8/07 at 10:15 AM |
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you can get a silicon hose that is fuel resistant - its a coating they put inside the hose. I asked someone about this (can't remember the
supplier). It does work but its a little fragile as its a coating so won't be happy being pushed over something repeatidly.
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matt_claydon
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| posted on 2/8/07 at 10:53 AM |
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I'm using this 48mm ID fuel hose from Merlin:
http://www.merlinmotorsport.co.uk/FUEL-CAPS-Fuel-Hose/Bends/c22_153/p1818/FUEL-HOSE-48MM-(1%22-7/8)-X-150MM/product_info.html with appropriate
Jubilee clips. No problems with throttle-bodies falling off so far.
[Edited on 2/8/07 by matt_claydon]
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oliwb
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| posted on 2/8/07 at 12:12 PM |
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Over 1,000 miles and 2 years with my bogg bros manifold and green silicone hoses (supplied by them) and I've got/had no problems as you
describe. Maybe they're not fitted correctly? Shouldn't be any hose showing really if they are butted up tightly enough (which is how
they should be)......Oli.
If your not living life on the edge you're taking up too much room!
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flak monkey
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| posted on 2/8/07 at 05:08 PM |
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You need fluoro lined silicone hoses, or fuel resistant reubber ones. Both are readily available, but boggs dont seem to be supplying the right stuff
for some reason. Either that or they have had a bad batch of tube....
Sera
http://www.motosera.com
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bricheun
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| posted on 2/8/07 at 05:47 PM |
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RUbber hoses breaking
My car was running great with the boggs setup for almost 9 months and 8000 miles. Two days ago the car running very rough, rocking back and forth no
matter how much I balanced the carbs, tune the idle needle etc. Looked at the rubber hose and noticed it was cracking up and basically falling apart.
Something is not right and need to find some replacement hoses quick. If these bits and pieces gets stuck on the valve someone said it causes the
engine to run rough as well because it opens up the valves(stuck open)....I am worried!
[Edited on 2/8/07 by bricheun]
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bricheun
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| posted on 5/8/07 at 06:01 AM |
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Has anyone found silicone hose with a 41mm ID?
Tried normal rubber ones (black) and boggs bros type, but both deteriorate in a short time.
I have found Samco fuel/oil hose - which is very expensive.
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grusks2
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| posted on 5/8/07 at 09:46 AM |
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Ive green hoses and im now off for a look
http://mac1worxbuild.wordpress.com/
forgot my old password so another username doh
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scoop
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| posted on 7/8/07 at 09:10 PM |
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Rather than you looking shouldnt Bogg Bros be offering an alternative?
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Ratters
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| posted on 12/8/07 at 10:13 AM |
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quote:
Originally posted by scoop
Rather than you looking shouldnt Bogg Bros be offering an alternative?
I spoke to them this week about it & to be honest they weren't that interested at all.....
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r1_pete
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| posted on 12/8/07 at 10:23 AM |
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On a Bike (yes I own a 2001 R1) the carbs not only mount to the head, but also the airbox performs a stabilising function too, so the carbs dont moove
much. On car installation more often than not the intake side is unsupported, hence as well as material breakdown stress forces come into play. On my
Zetec ZZR1100 Bogg I'm building in a couple of supports to run diagonally from the filter flange to a point lower on the block. Will post pics
when its done.
Cheers.
Pete.
Experience is a fine teacher, but the fees are very high.......
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DarrenW
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| posted on 3/10/07 at 11:44 AM |
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I can now confirm this is nt just a Boggs issue. I used silicon blue hose. Had the carbs pop off twice now and today have found the rubber has
perished. Just on with replacing the blue silicon with Alfagomma T-352 rad hose to see if thats ant better (the stuff PDlewis has on his).
It looks like the carbs have damaged the hose and allowed the fuel to perish it. The exposed bit inside is fine - so its just knackered where the
carbs are fitted.
Fingers crossed.
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jacko
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| posted on 3/10/07 at 09:00 PM |
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Hi i have silicon hose it's been on for about two years with no problems .
When i fitted them i super glued them on the carbs before fitting the clips + i fitted a stay to stop any movement on the manifold
Jacko
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DarrenW
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| posted on 4/10/07 at 08:10 AM |
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I think i know what caused it on mine. There is only a very short stub on the carbs and they have a recess in them, i think to help sucure the clips.
i reckon this recess has a tad too sharp a corner, plus being short its easy to over tighten which chews up the edge of the hose. Jubilee clips are
maybe a touch too wide as well so part of the clip is off the stub. Fuel gets into the torn area and it seems to get gamaged (or at least becomes
slippy).
Grahams idea sounds reasonable to me - ie bond the rubbers on and then use clip as a final mechanical grip.
Interestingly, the area that i thought might fail first (the middle bit exposed to fuel / air mix) didnt look damaged at all. So in conclusion id say
silicon tube is fine but take care how you connect to the carbs themselves.
[Edited on 4/10/07 by DarrenW]
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Pdlewis
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| posted on 4/10/07 at 09:02 AM |
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I have also had some problems with the connection from pipe to carb mainly as darren says because the jubily clips are a tad wide and my pipe is
possibly a bith thick so if over tightened it either splits the rubber or causes the carb to pop out.
I have been considering gettin some of those clips which are a band so tighten evenly as opposed to the jubily clip which flattens out where the
tightening mechanics are
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