I’ve heard that many think the distortion to the flange is from overtightening whereas it’s from heat. It happens far less on cars with plastic insulating blocks hence why, after getting my flanges flat (no comments please) I fitted longer studs and plastic blocks as per the MGA. [b][i]Norman Verona[/i][/b]11 Cherry Close, Royston, South Yorkshire S71 4LZPhone: 0044 (0)1226 728811Mob: 0044 (0)741 9905 741[b][i]Web:
www.frenchblat.com[/i][/b] [b]From:[/b]
mg-tabc@yahoogroups.com [mailto:
mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]'Trevor Burnett'
trevor@safxmarine.co.za [mg-tabc]
[b]Sent:[/b] 24 November 2017 10:40
[b]To:[/b] 'Norman Verona' norman@frenchblat.com>; 'Rothgene' RothGene@msn.com>;
mg-tabc@yahoogroups.com
[b]Subject:[/b] RE: [mg-tabc] Carburettor butterflies Whilst on the discussion, I was given a body with a badly distorted flange, I placed the body in my hydraulic press with light pressure then heated it up with a heat gun slowly applying add. pressure, between the gentle press application and the heat gun and leaving the body to cool down with the applied pressure, the flange only required light lapping to achieve perfect “flatness”. [b]From:[/b]
mg-tabc@yahoogroups.com [
mg-tabc@yahoogroups.com] [b]On Behalf Of [/b]'Norman Verona'
norman@frenchblat.com [mg-tabc]
[b]Sent:[/b] 2017/11/24 11:11 AM
[b]To:[/b] 'Rothgene';
mg-tabc@yahoogroups.com
[b]Subject:[/b] RE: [mg-tabc] Carburettor butterflies There are no leaks at the manifold, the flanges aren’t bowed, the butterflies are in the correct way (but weren’t fully centralised). Just for the record, I started work on January 1st at University Motors and on the Thursday was shown how to overhaul a pair of SU’s on a TC. That was 1961.However, after all these years of messing about with cars I’ve never come across a distorted carb body. As I’ve said before, it doesn’t matter how much you know, you’ll always learn more. [b][i]Norman Verona[/i][/b]11 Cherry Close, Royston, South Yorkshire S71 4LZPhone: 0044 (0)1226 728811Mob: 0044 (0)741 9905 741[b][i]Web:
www.frenchblat.com[/i][/b] [b]From:[/b] Rothgene [
RothGene@msn.com]
[b]Sent:[/b] 23 November 2017 23:27
[b]To:[/b]
mg-tabc@yahoogroups.com;
norman@frenchblat.com
[b]Subject:[/b] Re: [mg-tabc] Carburettor butterflies
Check for air leaks at the intake manifold
[b]From:[/b]
mg-tabc@yahoogroups.com mg-tabc@yahoogroups.com> on behalf of
norman@frenchblat.com [mg-tabc] mg-tabc-noreply@yahoogroups.com>
[b]Sent:[/b] Thursday, November 23, 2017 6:43 PM
[b]To:[/b]
mg-tabc@yahoogroups.com
[b]Subject:[/b] [mg-tabc] Carburettor butterflies This isn't my TC but a friends. The engine will not run slower than 1500 rpm, even with all adjustments screws fully undone. I diagnosed, remotely that the new butterflys fitted by the chap who'd sold him the car wern't centalised. I went there today and took the carbs off. The butterflys weren't correctly centaliseed and the throttles close fully now. However I notice that there is a large gap on the sides of the butterfly's and, when refitted, the engine is still running fast. Jerry, the owner says the chap who's been working on says it needs new carbs because the "throats" are worn. In over 50 years of working on SU's I've never seen oval throats. Any thoughts? In the meantime I'm ordering new spindles and butterflys as I suspect the throttle adjusting arms have been drilled in the wrong plalce and the slot in the spindle is too far over one way stopping the butterfly being fitted. To overcome this it looks like he's filed the sides of the butterflies.