Grant Baker Posted March 1, 2018 Report Share Posted March 1, 2018 Hey, Anybody know of a Bosch Style "donut" Knock Sensor with a 10mm hole in it rather than 8mm? Currently I'm having some step down studs made, but would love to do it with a simple sensor change instead! Quote Link to comment Share on other sites More sharing options...
ClintBHP Posted March 1, 2018 Report Share Posted March 1, 2018 What is the M10 thread because an M8 helicoil fits nicely in a Jap 10x1.25mm hole. Quote Link to comment Share on other sites More sharing options...
MagicMike Posted March 2, 2018 Report Share Posted March 2, 2018 I have drilled out to suit a 10mm bolt. Works fine. I was sceptical, but Andre at HP says he does it all the time. Quote Link to comment Share on other sites More sharing options...
mattames Posted March 4, 2018 Report Share Posted March 4, 2018 Hi Grant, If you have a 12mm hole, Toyota make these studs available for a few dollars, they're very commonly used on Toyota OEM applications to mount 8mm Bosch style sensors to an M12x1.25 threaded holes. The part numbers are:- 90126-08039 or 90126-08046 Cheers, Matt Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted March 4, 2018 Author Report Share Posted March 4, 2018 Thanks, I drilled a sensor today and tried it before and after. No difference at all when using a 10-8mm stud and 8mm hole, or using an M10 bolt and drilled sensor. Same knock levels, same background noise etc etc. MagicMike 1 Quote Link to comment Share on other sites More sharing options...
Grant Baker Posted January 31, 2019 Author Report Share Posted January 31, 2019 Did anybody know if there was a 10mm option of those studs? Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted January 31, 2019 Report Share Posted January 31, 2019 Some VW's use an odd M8 to M10 stud, cant seem to find them now. Or it seems you can get adapters for motorbike mirrors ( one of this pair seems to have a LH M10 male thread, the other a RH male thread ) https://www.amazon.co.uk/YAMAHA-MIRROR-ADAPTORS-MIRRORS-RIGHT/dp/B002RB107M/ref=sr_1_4?s=automotive&ie=UTF8&qid=1548978673&sr=1-4&keywords=8mm+to+10mm+thread Doesnt say thread pitch though, but ti does look like standard as opposed to typical Jap fine thread. This also looks same idea. https://www.amazon.co.uk/Ryde-Motorcycle-Mirror-Thread-Adapter/dp/B00CJD1P5A/ref=pd_sbs_263_2?_encoding=UTF8&pd_rd_i=B00CJD1P5A&pd_rd_r=e25b6f29-25b2-11e9-ad2c-0f2b64b4e14a&pd_rd_w=Kdomj&pd_rd_wg=xwJnf&pf_rd_p=18edf98b-139a-41ee-bb40-d725dd59d1d3&pf_rd_r=K31Z623BF7RP05FKPCES&psc=1&refRID=K31Z623BF7RP05FKPCES Or helicoil the M10 hole to M8. It'll never hold a strong fixing, but perfectly strong enough for a knock sensor. Or get some M10 threaded rod and some dies and thread it down to M8. Quote Link to comment Share on other sites More sharing options...
Stevieturbo Posted March 17, 2019 Report Share Posted March 17, 2019 The VW M10 to M8 stud I talked about the first time ! https://www.ebay.co.uk/itm/BEETLE-CABRIO-Stud-M8-exhaust-stud-repair-oversize-M8-M10-x-38mm-N0144832/361427269003?hash=item5426be758b:g:FqYAAOSwKJFaqBW8 Quote Link to comment Share on other sites More sharing options...
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