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New Exhaust Query

Posted: Sun Nov 03, 2013 11:18 am
by edd_barker
Hi all,

Flange snapped off my exhaust last week at 65mph which made it very loud all of a sudden. Still drove OK with just the manifold but fuel consumption did suffer a touch...

If I buy a maniflow small bore system, which inlet manifold do I need to let me run the original carb for a while until I get the 12G940 rebuild finished? Ideally I would fit the exhaust, put the same carb on a new manifold and have no re-tuning to do, until I get the larger carb and swap the engine and can set it all up then.

Or shall I just buy a new S/S system and use that?

I've never fitted an exhaust before so any hints tips would be much appreciated.

Thanks in advance,

Edd

Re: New Exhaust Query

Posted: Sun Nov 03, 2013 11:20 am
by bmcecosse
Just cut the inlet section off the old manifold, and use that meantime.

Re: New Exhaust Query

Posted: Wed Nov 06, 2013 7:52 pm
by edd_barker
Ok I'll have a go at grinding that off, thanks!

Re: New Exhaust Query

Posted: Wed Nov 06, 2013 8:04 pm
by bmcecosse
Cut first - well in to the part you want to throw away - then grind back the part you are keeping till it fits nicely without touching the exhaust. This alone will release another ~ 2 mighty horse power to your engine - by eliminating the 'hot spot' .

Re: New Exhaust Query

Posted: Wed Nov 06, 2013 8:24 pm
by edd_barker
2 Horsepower, sounds good to me. Retune carb to achieve that though yes?

Having seen that an alumised exhaust is only £55 I am tempted to just do that. Maniflow would be nice but it is dear

Re: New Exhaust Query

Posted: Wed Nov 06, 2013 8:33 pm
by bmcecosse
I would just stick with the aluminised exhaust - when I 'upgraded' mine I noticed very little difference. However a better/no hot-spot inlet IS worth having.