johnboybelfast Posted October 29, 2021 Share Posted October 29, 2021 Look whats arrived my dudes 😁😁 cant wite to fix some more engines 1 Quote Link to comment Share on other sites More sharing options...
Bajadre Posted October 29, 2021 Share Posted October 29, 2021 nice brother should keep ya busy hehe 😀 👍 Quote Link to comment Share on other sites More sharing options...
bishbashbosh Posted October 31, 2021 Share Posted October 31, 2021 What's a repinching tool then? Quote Link to comment Share on other sites More sharing options...
Nitroholic Posted October 31, 2021 Share Posted October 31, 2021 basically..... it's a steel collar you put over the liner and tighten up. It squashes the cylinder liner in a fraction to restore the 'pinch' on a nitro engine. As these motors do not have piston rings liike larger engines do, it relies on atight fit between piston and liner for compression. To achieve this with minimum friction...the cylinder liner is not parallel...and narrows slightly at the top to reduce tolerances. This stops the gasses all escaping round the piston. As the motor wears, most of the wear is at the part where the piston and liner rub....which loses compression. This squashes it back in to restore some compression. You can't replace the worn away metal...but it does extend the life of the liner. This is a propoer tool to keep the thing even and squash it while retaining a proper round cross section. Old bodge methods used jubilee clips and the like...which were hard to manage, and ruined a liner as often as they saved it. This is a bit more professional. Results with repinching are never guaranteed...but as the motor is low on compression and probably running like a pig when you do this sort of thing......there isn't much to lose! 2 Quote Link to comment Share on other sites More sharing options...
johnboybelfast Posted November 1, 2021 Author Share Posted November 1, 2021 Very well said as always my man u know your stuff alright 👏👌 its worked a treat on my 25 engine last night 1 Quote Link to comment Share on other sites More sharing options...
bishbashbosh Posted November 1, 2021 Share Posted November 1, 2021 Appreciate the explanation! Learnt something! Quote Link to comment Share on other sites More sharing options...
jayc Posted November 1, 2021 Share Posted November 1, 2021 Would this tool fit a Schumacher r18 liner? I can’t find new piston and sleeves anywhere I’ve managed to source 1 but been a twin engine manic kinda don’t want to use a single new one I’d rather try and save the 2 liners that’s already in? 1 Quote Link to comment Share on other sites More sharing options...
johnboybelfast Posted November 2, 2021 Author Share Posted November 2, 2021 Well ut worked on my hpi bullet witch is a .18 so id say it would work ok bro measure the width of the cylinder it shoud be 21 mm 😉 Quote Link to comment Share on other sites More sharing options...
jayc Posted November 2, 2021 Share Posted November 2, 2021 Where do I get the tool you’ve bought I couldn’t find one last night when having a quick look Quote Link to comment Share on other sites More sharing options...
locky Posted November 2, 2021 Share Posted November 2, 2021 Quote Link to comment Share on other sites More sharing options...
locky Posted November 2, 2021 Share Posted November 2, 2021 https://www.ebay.co.uk/itm/302160614643?var=601772118844 Quote Link to comment Share on other sites More sharing options...
locky Posted November 2, 2021 Share Posted November 2, 2021 Maybe single split collar is better? Quote Link to comment Share on other sites More sharing options...
johnboybelfast Posted November 3, 2021 Author Share Posted November 3, 2021 On 02/11/2021 at 07:58, jayc said: Where do I get the tool you’ve bought I couldn’t find one last night when having a quick look Ebay mate pick tbe 19mm bore Quote Link to comment Share on other sites More sharing options...
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