virden Posted September 21, 2018 Share Posted September 21, 2018 X/F Super Sprint: The middle header on my 4:1 keeps blowing its gasket, due we think to the weight of the system causing it to distort when hot. I have used exhaust gasket cement which only lasts a few hundred miles before disintegrating, so I am wondering is there available a fire proof silicon type product which can cope with the expansion/contraction. Or thick squiggy gaskets which will cope? Link to comment Share on other sites More sharing options...
oilyhands Posted September 21, 2018 Share Posted September 21, 2018 Loctite 5920 Copper silicone sealant is the stuff to use.Oily Link to comment Share on other sites More sharing options...
7 wonders of the world Posted September 21, 2018 Share Posted September 21, 2018 This flange does get distorted, worth putting a straight edge over it to check and dressing it if you find is is. Link to comment Share on other sites More sharing options...
Sooty Posted September 21, 2018 Share Posted September 21, 2018 Almost certainly distortion in the flange as the 4/1 or 4/2 collector should eliminate any moment caused by the weight of the pipe. If the flange is true then should need any gunk to seal it. Never had an issue with my Piwerspeed system on my xf. Link to comment Share on other sites More sharing options...
virden Posted September 23, 2018 Author Share Posted September 23, 2018 Have run a straight edge over both the head and the flange plate and as far as I can see both are true. Primaries 2& 3 are on the bottom of the collector so I think they do bear more weight? I fitted the primary the other day, tightened it and then checked for gap with a feeler gauge. No gaps and no leaks for 150 miles, then a gap of c. 0.01mm appears at the top and it leaks. It looks like the gasket compresses or collapses. The allen bolts on the flange were still tight. Link to comment Share on other sites More sharing options...
NeilCSR Posted September 24, 2018 Share Posted September 24, 2018 Or Permatex:https://www.permatex.com/products/gasketing/ultra-series-gasket-makers/permatex-ultra-copper-maximum-temperature-rtv-silicone-gasket-maker/Used on numerous occasions when needed and always excellent.Neil Link to comment Share on other sites More sharing options...
randybugger Posted September 26, 2018 Share Posted September 26, 2018 Try eBay for cooper gasket for xflow, put it on clean (with no sealant) and it should squash down and hold its shape.ive just ordered some new ones for mine, the last ones have been on for 18 years Link to comment Share on other sites More sharing options...
randybugger Posted September 26, 2018 Share Posted September 26, 2018 Looks like they are out of them at the moment but it might be worth contacting the sellerhttps://www.m.ebay.co.uk/sch/i.html?sid=orbitalmotorsport&isRefine=true&_pgn=1 This is a set of large bore copper exhaust gaskets to fit all Ford Kent crossflow engines fitted in Escorts, Fiesta's and many other cars fitted with the xflow engine. made from 2mm copper with a 34.5mm bore they will fit both standard and ported cylinder heads. When fitting please make sure the mating surfaces are clean and flat and if necessary use a smear of gasket sealant. Link to comment Share on other sites More sharing options...
randybugger Posted September 26, 2018 Share Posted September 26, 2018 Found their websitehttp://www.orbitalmotorsport.co.uk/page4.php?view=productPage&product=30&category=5 Link to comment Share on other sites More sharing options...
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