jonboylaw Posted January 2, 2005 Share Posted January 2, 2005 1800 RK crossflow. Looks like the exhaust gasket is blowing on cylinders 2 & 3. Questions: 1: will this cause the excessive amount of bangs and pops I get on over run? 2: I get the occasional spit back through the carbs, is this a side affect or is it a symptom of the timing being out? 3: Replacing the gasket, is it just a case of buying the correct replacment, lossening off the Hex Bolts, removing bolts from 2 & 3 and fitting the gasket and bolting back up? Anyone offer advice? Thanks in advance. Jonathan ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Big Brother Posted January 2, 2005 Share Posted January 2, 2005 To answer your questions... 1, Yes! The leaky gasket allows air to enter the exhaust and akes for "pops and bangs" (great arn't they 😬) 2, Spitting carbs is usually a symptom of a lean mixture. However most tuned Xflows spit a little. Mine seems to be affected by the weather! 3, Yes, easy as that. The 7 workshop sell "copper" gaskets as recommended by Roger King. These last a LOT longer and can be reused in necessary. Cost is around £25 a set. Hope that helps Steve SE7EN-UP! (It'S NOT Green!) Link to comment Share on other sites More sharing options...
jonboylaw Posted January 2, 2005 Author Share Posted January 2, 2005 Cheers Steve, Not sure I am running lean but will get the car over to RGS for a rolling road session in the spring. Thanks for the info on the gasket sets. I'll invest in a set, whilst the manifold is off I might as well "match" the gaskets to the manifold. I'll let you know how I get on. Cheers, Jonathan ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Big Brother Posted January 2, 2005 Share Posted January 2, 2005 Jonathan, If it only spits occasionaly at low revs I wouldnt worrytoo much about it. I think it may be a case of TADTS. Steve SE7EN-UP! (It'S NOT Green!) Link to comment Share on other sites More sharing options...
jonboylaw Posted January 2, 2005 Author Share Posted January 2, 2005 Mainly at low revs, but also mid too. I have recently noticed that it has "stalled" when flooring the throttle, basically engine dies for a fraction of a second when excellerating hard. Possibly the leaking gasket, but I think a tune up is needed soon. Next question is before or after the new silencer Jon ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Blackbirdman Posted January 2, 2005 Share Posted January 2, 2005 They all do that Sir Life begins at 10,000 Link to comment Share on other sites More sharing options...
Gavin Posted January 3, 2005 Share Posted January 3, 2005 Jonathan, You are asking as to wether a new silencer ( like a Raceco, Techcraft e.t.c ) before or after a RR session ? BEFORE Gavin. Edited by - Gavin on 3 Jan 2005 08:57:57 Link to comment Share on other sites More sharing options...
jonboylaw Posted January 3, 2005 Author Share Posted January 3, 2005 Steve, Just did a seach for xflow gaskets and have seen a copper set of cnc produced gaskets for £14, got be ad cheaper alternative to the 7 workshop ones at £25. link is below: http://ferriday.co.uk/cnc/production.html I might see if they would offer a bulk buy if other x-flow owners are up for it. Gavin, I was expecting this, just need to raise the finance for the Raceco Santa never delivered. Jonathan ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Big Brother Posted January 3, 2005 Share Posted January 3, 2005 Jonathan, Good find!!! I'd be up for a set if a bulk buy goes ahead. Not a bad price, they are already around £10 cheaper than the ones advertised in Low Flying. Does anyone know if the ones advertised in LF are any different from the ones mentioned above? I guess they must be due to the price difference Steve SE7EN-UP! (It'S NOT Green!) Link to comment Share on other sites More sharing options...
budgie Posted January 3, 2005 Share Posted January 3, 2005 I'm up for the bulk buy as well. Link to comment Share on other sites More sharing options...
JampJ Posted January 3, 2005 Share Posted January 3, 2005 Us too!! Cheers J&J Link to comment Share on other sites More sharing options...
Normans_Ghost Posted January 3, 2005 Share Posted January 3, 2005 Roger Needham was showing me a bracket made to support pipes 2 & 3 which takes the strain off the manifold flange. Sounded, and looked, like common sense to me. I can contact him if anyone wants more info. (email me) Norman Verona, 1989 BDR 220bhp, Mem No 2166, the full story here Link to comment Share on other sites More sharing options...
JampJ Posted January 3, 2005 Share Posted January 3, 2005 The one sold by Roger King is a heat resistant material, sandwiched between two thin copper plates, I've just emailed Ferriday to enquire what theirs are. Will post when I've got their reply. Cheers J&J Link to comment Share on other sites More sharing options...
blade_runner Posted January 3, 2005 Share Posted January 3, 2005 I always thought that spit backs thru the carb were often due to running too rich...???? the mixture when too rich burns slowly and sometimes is still buring when the inlet valve opened, causing a spit back... maybe its just an old wifes tale but i'm sure i heard it some where 'Pinky Pics' here Link to comment Share on other sites More sharing options...
jonboylaw Posted January 3, 2005 Author Share Posted January 3, 2005 I have contacted Ferriday to see if they are interested in a group buy discount 😬. I'll post the reply here once I know. Jonathan. ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Asklepios Posted January 3, 2005 Share Posted January 3, 2005 Jonathon, When the manifold is partially off, suggest remove the system completely. The flanges will not be straight. This is the most common cause of exhaust gaskets blowing. Take to a machine shop who will true this up for £15 or less if they like you. Since trued,I have never had to replace this gasket. Should add that locking the cap head manifold bolts is essential. Used to wire lock ( drill before use),but have found common thread lock seems to survive the heat adequately. The RK copper gasket seems to be the same as others , just bigger. Link to comment Share on other sites More sharing options...
Leadership Team RogNeedham Posted January 3, 2005 Leadership Team Share Posted January 3, 2005 Norman just directed me to this posting Like all the similar posts I became increasingly pi**ed off with replacing c.6 gaskets for cylinders 2 & 3 - never a problem with 1 & 4. I also used the copper type from Roger King and whilst they lasted longer they did not cure the problem. As Norm points out I kept moaning about the problem to a mate at the regular Friday night drinking and session. Fortunately this friend is an engineer with a well equiped workshop and after about 3 hours trial and error one Saturday afternoon he made a bracket that supports the angled section of the primary pipes. We decided this was easier (at the time) than trying to fit a support between the frame and the pipe just in front of the silencer. If anyone's interested I'll take some pictures and put them in a web album for all to see. Rog Link to comment Share on other sites More sharing options...
jonboylaw Posted January 3, 2005 Author Share Posted January 3, 2005 Roger, I would be very interested in seeing some pictures. Can you post them or send a link via e-mail. is it weld on? and what are the chances of remanufacturing one? Cheers, Jonathan ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
budgie Posted January 4, 2005 Share Posted January 4, 2005 I would be interested in seeing the pics too. Link to comment Share on other sites More sharing options...
JampJ Posted January 4, 2005 Share Posted January 4, 2005 The Ferriday gaskets are just copper, 0.9mm thick. Shouldn't be too difficult to make your own! Cheers J&J Link to comment Share on other sites More sharing options...
jonboylaw Posted January 4, 2005 Author Share Posted January 4, 2005 Ok, so anyone interested in a bulk buy? "The price of £14.00 per set will come down to £12.50 if 10 are ordered, or £9.50 for 20 sets. These gaskets are 0.9mm thick, with a 33mm aperture (to cope with port modifications) and should last the life of the engine regardless of how many times they are removed & refitted. If a different aperture diameter is needed it's no problem, just a couple of days for delivery." If there is interest then I will post in Chit Chat. Jonathan. ----------------------------------- 1db too loud ! ☹️ Bastxxd Santa never delivered the Raceco!!!! ☹️ Link to comment Share on other sites More sharing options...
Big Brother Posted January 4, 2005 Share Posted January 4, 2005 I guess even a 0.9mm solid bit of copper should be more effective than the "standard" item. My gaskets always seem to blow from between the two outer skins - they just open up. Nearly always happens on 2 and 3 and doesnt seem to matter if the gasket is a one or two hole version. Does anyone here use "solid" copper gaskets? Steve SE7EN-UP! (It'S NOT Green!) Link to comment Share on other sites More sharing options...
Leadership Team RogNeedham Posted January 4, 2005 Leadership Team Share Posted January 4, 2005 I'll try and get the pictures sorted out asap. I'm not sure any gasket will solve the problem - to me it seems to be a fundamental design flaw with the central manifold bolts being across the horizontal and the (unsupported) weight of the primaries and can 'pulling down' on the joint, a gap is bound to appear between the head and primary exhaust flange - hence the need for support from below. It should be possible to copy mine - the support is made from steel and two U clamps welded together and attached to the lower rear engine mount. Pictures will make it clearer. Rog Link to comment Share on other sites More sharing options...
Leadership Team RogNeedham Posted January 4, 2005 Leadership Team Share Posted January 4, 2005 ...oh yes and another thing. I had a new flange made for 2 & 3 pipes by CCM. I then used RK copper gaskets and it still blew - it just took longer to give ❗ Rog Link to comment Share on other sites More sharing options...
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