exhaust pipe...help with sliding joint sizes

[steveo3002]

ok , made a newbie mistake here

i had a 50mm outside diameter downpipe , and wanted something to slide over it , ebay has a seller that can make joiners to your spec so i ordered 50mm inside diameter assuming it would slide over a treat

it didnt ...we heated it up red hot and had hell of job battering it on

so...what amount would you add so that its a nice slide on fit but not too loose or interferance fit

 

[ozone]

i have 2 pieces of tube that fit in/over the other one is 47mm o/d other is what seems to be 47.65mm,,,nice slide fit but it is polished,,, so you could polish it down to get the fit needed,,,

 

[ozone]

also depending on wall thickness i have had tube that was interferance fit but when outside one was heated it never fitted againe ??

 

[Paul G]

Lots of tube is still made to imperial sizes.

Could it be that your downpipe is 2", i.e. 50.8mm ?


When I swage (expand) 50.8 o/d to fit another pipe into it I use a 50.8 press tool.
For some reason the pipe ends up slightly bigger, about 51.2 i/d, which seems about the right fit.

Cheers,
Paul G

 

[gavuk]

I have a set of these,only used my set once so far and used my air impact wrench to drive it,worked well but too soon to recommend unreservedly..........linky

 

[Angusdog]

I have a set of these,only used my set once so far and used my air impact wrench to drive it,worked well but too soon to recommend unreservedly..........linky

NOT FOR IMPACT USE

In spite of that, they look handy and at that price, cheap enough to have on hand just in case. I'll look for some locally.

 

[steveo3002]

what sort of stretch would they do if you really tried? fractions of a mm or a few mm? certainly looks handy as theres not much differance between wont fit and fits like rubbish lol

 

[gavuk]

Haven't got that exact set ,although a mate has just bought the ones i've linked, had no disclaimer on my set about the use of impact wrenchs...........Steve,a lot will depend on material and thickness,I increased the diameter on a steel exhaust by approx 1-2mm, no problem,I would like to think that it would increase the diameter of an exhaust (thin pipe )to slip over its start diameter...hopefully