AMG Posted November 9, 2015 Share Posted November 9, 2015 Fitting a set of twin carbs to the 400 rep, took inlet manifold off and saw that the inlet and exhaust manifolds are connected. Is there a blanking plate available anywhere, or can someone recommend a good replacement exhaust manifold? Quote Link to comment Share on other sites More sharing options...
spiney_norman Posted November 9, 2015 Share Posted November 9, 2015 A standard GTE manifold will do you! 1 Quote Link to comment Share on other sites More sharing options...
MANTAMAN Posted November 9, 2015 Share Posted November 9, 2015 The single carb manifold set-up has this hole in the top of the exhaust manifold to provide carb heat and prevent carb icing on cold damp days. On a GT/E exhaust manifold this is blank, but as you are trying to improve the performance with twin carbs i would suggest replacing the exhaust manifold with a performance tubular variaty, this would compliment the twin carbs perfectly removing the restrictive cast iron manifold, good flow in, good flow out ! Quote Link to comment Share on other sites More sharing options...
AMG Posted November 10, 2015 Author Share Posted November 10, 2015 I would prefer a performance manifold, but cant find any for CIH engine, anyone know where sells them? Quote Link to comment Share on other sites More sharing options...
611 Posted November 10, 2015 Share Posted November 10, 2015 There not cheap. But a few places for you to try. http://www.krause-rennsporttechnik.de/shop/Auspuffanlagen/MantaAscona-B www.enem.se http://www.risse-motorsport.de/index.php/cat/c507_Exhaust-manifolds.html Quote Link to comment Share on other sites More sharing options...
Kevin Abbott Posted November 10, 2015 Share Posted November 10, 2015 Those manifolds are very nice but before you lay out any money make sure they fit RHD as the column will be in the way Quote Link to comment Share on other sites More sharing options...
611 Posted November 10, 2015 Share Posted November 10, 2015 I agree, drop them a line to check what they do, as its hard to get the old steering past a custom one! more so on the A. :-) Quote Link to comment Share on other sites More sharing options...
MANTAMAN Posted November 11, 2015 Share Posted November 11, 2015 There is one other posiblity, have a system built by a specialist, not cheap but as hugely expensive as might be imagined. I had a Manifold back system made for my 1800 hatch out of top grade stainless for just over £500, life time garantee, it was made at this bussiness - Top Gear Aylesbury - click here The head man here can make whole systems for any car, he has been making them for over thirty years and you can tell by talking to him that there really isn't much anybody could tell him about exhausts ! I do appreciate that you are in Ireland but there must be similar bussiness there, especially considering how popular all forms of motorsport are in Ireland.. Quote Link to comment Share on other sites More sharing options...
lamchop77 Posted November 11, 2015 Share Posted November 11, 2015 Really don't bother with a tubular one unless your on a big capacity 2.3 or 2.5, its a total waste of time and money. The tubular one will also be a pig to fit with sidedraughts. The cast manifold is very good as std, You can make it better by smoothing the casting flash off to to improve it a little (but not much!!!!). Invest in a bigger bore system and downpipes for far more gains. I ran a std GTE manifold and downpipes to a home built 2.5" system on a tuned 2.2, that was putting out about 180bhp. If you still want to spend your dosh on one at least buy a good one. Check the Martelius manifolds out, think they are about 350-400 quid. HTH Chris http://www.martelius.com/verkkokauppa/en/index.php?module=ekauppa&type=17&print=yes&merkki=Opel&malli=&vuosimalli=&moottori=&paatuote=&tuoteryhma= 1 Quote Link to comment Share on other sites More sharing options...
jasonj Posted November 11, 2015 Share Posted November 11, 2015 Ashley make a 4-2-1 manifold for the CIH. UK made so will be for RHD cars http://www.jjcraceandrally.com/race/exhaust-parts/ashley-competition-exhausts-competition-exhaust-manifolds 1 Quote Link to comment Share on other sites More sharing options...
nickincrete Posted November 27, 2015 Share Posted November 27, 2015 standard 2.4 exhaust manifold Quote Link to comment Share on other sites More sharing options...
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