BrianJT Posted August 22, 2016 Share Posted August 22, 2016 Hi,My 1959 Fairthorpe Electron Minor is based on a 948cc Herald but now uses a 1147cc, re-bored to 1174cc, engine.The original supplied exhaust system, from whatever car I don't know, was replaced with a side-exit silencer that worked satisfactorily for me.When I started to re-build the the car in 2009, I replaced the silencer with a stainless steel version made to the same dimensions as the one used previously.Now that I am running the car, I find that the new silencer is very noisy and the car lacks power - 60mph flat out on the M11.Can members with 1200 Heralds kindly supply me with all details of the exhaust system - dimensions AND part numbers, please as I have to make certain that I can fit items into the available space.My original system had a tail pipe that looped over the axle - is this true of the 1200cc Herald?All answers gratefully received and acknowledged.Brian Quote Link to comment Share on other sites More sharing options...
RobPearce Posted August 22, 2016 Share Posted August 22, 2016 I don't have a 1200 butQuoted from BrianJT My original system had a tail pipe that looped over the axle - is this true of the 1200cc Herald? on this specific point, I'm fairly sure all but the very earliest 948 Heralds had the exhaust pass beneath the side of the diff (and the very earliest probably did, too, but ISTR there's a chassis oddity). Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 22, 2016 Author Share Posted August 22, 2016 Thank you Rob.Brian Quote Link to comment Share on other sites More sharing options...
Casper Posted August 22, 2016 Share Posted August 22, 2016 Brian, To find an exhaust, the engine size is not so relevant as the exhaust manifold you have fitted, which is a 948 TC manifold. Parts lists are available online or on CD from a number of places.C. Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 22, 2016 Author Share Posted August 22, 2016 Tank you again, Casper.Brian Quote Link to comment Share on other sites More sharing options...
herald948 Posted August 22, 2016 Share Posted August 22, 2016 Casper is correct: the only truly relevant point here is that manifold and the headpipe (or at least the flange) that mates to it. You might find it's best to have someone fabricate the rest of the system, as I'm not sure the rest of any Herald system would properly match up to the Fairthorpe. And remember that, while the Fairthorpe used the Standard 10's "live" rear axle (hence the exhaust looping over same), the Heralds were all IRS with a fixed differential (hence the exhaust pipe running underneath the differential).Of course, if you're using a header rather than an original Stanpart manifold, then it's all pretty much irrelevant! If you're using either Herald 948TC twin carbs (SU H1s) and exhaust manifold or early Spitfire twin carbs (SU HS2s) and the early Spitfire's cast iron exhaust manifold, it would be all or part of that Herald 948TC headpipe that you'd need. Quote Link to comment Share on other sites More sharing options...
Casper Posted August 22, 2016 Share Posted August 22, 2016 Flange position, bore and PCD (hence gasket) is the same on 948TC, 12/50s and Spitfire 4 manifolds (but not 1200). Gasket is GEG702Listings for 12/50 parts may be easier to find (but would be the same). Don't know who supplies the down pipe onlyC. Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 22, 2016 Author Share Posted August 22, 2016 Hi Casper and Andy, Some useful info here - thanks a lot.Brian Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 24, 2016 Author Share Posted August 24, 2016 Hi to all correspondents and non-correspondents,I'm still trying to obtain ANY info re. the actual physical dimensions of the front and tail pipe and the silencer that is currently being used on a 1200cc Herald successfully.My Internet searches only reveal the shapes, not the dimensions.Thanks. Quote Link to comment Share on other sites More sharing options...
davidb5964 Posted August 24, 2016 Share Posted August 24, 2016 Not sure if relevent but a complete stainless 1200 system on ebay yesterday new unused £90 Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 24, 2016 Author Share Posted August 24, 2016 Hi DavidB, Thank you.I'll have to see if the dimensions are given.Brian Quote Link to comment Share on other sites More sharing options...
BrianJT Posted August 24, 2016 Author Share Posted August 24, 2016 Hi DavidB, Thank you.I'll have to see if the dimensions are given.Brian Quote Link to comment Share on other sites More sharing options...
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