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Thread: Cutting an Exhaust Pipe...?

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    Default Cutting an Exhaust Pipe...?

    Has anyone tried cutting a 2.25" exhaust pipe while it's still on the car, using a 4.5" angle grinder, where you have to cut it all the way through from the bottom of the pipe rather than being able to cut it from all sides? Can it be done or is the disk just too small? Thanks.

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    Vectra-C Extreme Poster Big Red's Avatar
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    Too small i would have said mate grinder body will get in way might be better with 5 inch grinder

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    Cheap exhaust cutter of the chain type

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    Regular Member rich r's Avatar
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    An angle grinder can only cut as deep as the centre clamp, which is about 40mm in diameter. So a 115mm disc (4.5") can only cut an absolute maximum (115-40)/2 = 37.5mm. Or in ancient units, 1.5". Ok, so you can get at a bit more by going in from the sides, you're not going to get to the bit of pipe nearest the floorpan.

    Chain type pipe cutter is the correct tool to use - it cuts all the way round at the same time, and only needs 10mm or so clearance. Also leaves a much neater cut and doesn't heat things up so much.

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    You're right about using a chain type cutter, but they're pretty expensive for something I'll use only once . I've decided to get a garage to do the job (cutting out the flexi section of the exhaust and fitting in a new stainless steel one I've bought from MIJ), as there's another issue - having to remove three quarters of the exhaust in order for the new part to go in, as there's obviously an overlap of the pipes from new to old. Doesn't seem feasible to do all that while lying under the car with the exhaust 3" from my nose.

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    Just get mij to do it for ya

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    Regular Member Adam8220's Avatar
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    Quote Originally Posted by sriandy View Post
    just get mij to do it for ya
    how good are mij, i'm thinking of having them do my dual exit conversion..

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    am sure a hacksaw would do the job.

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    Quote Originally Posted by montyfert View Post
    am sure a hacksaw would do the job.
    Eventually, yes it would. But it'd take quite some time, and underneath a car on axle stands there's not a lot of room to move your arms.

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    Quote Originally Posted by sriandy View Post
    Just get mij to do it for ya
    I paid £21.50 for the stainless steel flexi section from MIJ (the whole section including innards and end caps plus clamps, not just the gauze). It'd cost me twice that in petrol to get to MIJ and back, plus the payment for their labour...lol


    Quote Originally Posted by montyfert View Post
    am sure a hacksaw would do the job.
    A hacksaw wouldn't work - at the front end of the flexi the transmission tunnel is so small there just isn't enough room to get a proper size hacksaw against the exhaust pipe; even a junior hacksaw would be a tight fit but it'd be useless at cutting.

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