1974 A Series Opel Manta Blog

The Opel Project blog has been setup to record the rebuild of my 1974 A Series Opel Manta.
OPEL
1974 A Series Opel Manta Blog
OPEL

1974 A Series Opel MantaFeatured

My 1974 A Series Opel Manta. Its been a long project and it still has a way to go before it looks like it use to back in the day. Now running a 2.0l+ CIH engine on full Webber Alpha engine management. Everything is custom made or adapted, from the full 2.5″ stainless steel exhaust, Wilwood racing calipers, Cosworth rear calipers, Hydraulic clutch, Chevey S10 clutch kit and lots more.. Read on for full details of the rebuild and hopefull one day pictures of her out on the road!

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1974 Modified Opel Manta A Series
OPEL

We’re back on the road!!

Finally, after a long few months of getting the exhaust all sorted out, we are finally on the road. It was a beautiful sunny morning on the south coast, so it was time for a few last tweaks and checks and then it was time to head of for a shakedown. Everything ran fine, the temp was good, oil pressure reading ok and the steering was fine, the exhaust didn’t seem to knock, so all good :-). The brakes need a bit of bedding in and adjusting but that was expected. Time to check over and tighten up anything that…

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1974 Opel Manta A Series Custom Made Manifold
Exhaust

A Series Custom Manifold

After a trial fit, the manifold needed a couple of tweaks to get it just right. So it was back off to the welders for the adjustment and also i gave up on fitting a bracket so i could separate the two sections as it was just too tight to fit in properly and i wasn’t too sure if it would work loose, so i had it welded together. So here is the full A Series Custom Manifold all ready for the final fitting and then it’s just a couple of other bits to sort out and we will be…

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Opel Manta A Series custom exhaust manifold
Exhaust

Final piece of the Opel Jigsaw!!

Today i picked up the final piece of the Opel Jigsaw and its looking bloody good 🙂 Harvey the welder has done an amazing job welding up my mockup and it fits perfectly!! Now just a bit of cleaning up around the inlets and i think i might sand a few of the welds and give it a good polish and i can then get it fitted to the car. It looks like with a little bit of adjusting to the lower part that it will all match up perfectly. I should have done this a long time ago!  …

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Exhaust

Custom Manifold

Today i started making up the new manifold. STEP 1 COMPLETED I have the outer outlets all mocked up and tacked together and on Tuesday i will start on the middle pipes. Then it will be off to the welders to have it all fully welded up properly!   STEP 2 COMPLETED Now i just need to add the collector and set it up so it meets the lower part, then its off to the welders.   And its back!  

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Steering

Simplified steering setup

Now im making my own manifold and have streamlined the system setup i am able to simplify the steering and lose some of the UJ’s and support. So the setup will now be (working from the rack up) a Borgeson dampening UJ to replace the original flat rubber damper, then up to a Borgeson standard UJ, then i have used a Borgeson joiner to extend the standard steering column shaft so it brings the position of the UJ further down allowing the space i need for the manifold and as i have ditched the idea to run a 4 into…

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Exhaust

Custom Manifold

The two big issues i have always had are: Trying to get a decent manifold for the right had drive is almost impossible! When you do try to use anything bigger than the standard down pipes you get lots of problems getting it past the steering coloumn. Over the years i have tried loads of different options for exhausts (a couple you will see in other posts) and i have looked at all sorts of steering option (again, quite a few versions in older posts) so after trying lots of options that are made for the left-hand drive cars and…

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Opel Manta A Series custom made exhaust header
Exhaust

It’s not the prettiest thing i have ever done!

As the title suggest, this is not pretty but hopefully will get me to a point where i finally have a system and steering setup that works and that I’m happy with. Its very rough as my welding is shit and I’m not very patient with making exhausts, not something i could do for a living! But hopefully it will let me test out the fit and give it a bit of a shakedown and check that the clearance is all ok so i can then hopefully find a decent company to make me a pr oper one that does…

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Exhaust

Manifold Mock up

I have started to mockup the new exhaust header. After finding some pics of a company in the US who did a very nice system for an A series i have pinched a few ideas to see if it helps and one of those is to fit a bracket to the system and attach it to the gearbox, which will hopefully help to reduce and vibration on the system. Once i have it as i want i plan to give the car a couple of runs with my dodgy version on, with the view to having a proper one made…

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Exhaust

A Quick Update

So a quick update for anyone dropping by the site. Yes the car was on the road and i had 2 trips out in it, but the one thing that i have never managed to get sorted out properly was the exhaust and the manifold i spent so long adjusting and fitting just didn’t work and knocked too much. So as i knew it would drive me mad if i just carried on using the car i thought that it was best to take it off the road to fix it properly. I did a bit of googling and found…

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OPEL

Out for a proper run!!

So on Tuesday i had managed the pull the dash and get all the gauges working and hopefully the temp sender. So it was off down to Tesco’s to fuel up as the level was reading a bit low. With the new battery, i hoped it would start ok so as Tesco’s was not far i thought it was best to head there and back! Got there ok, the temp gauge was reading nicely and all the other gauges working great. Filled up, started up ok, so i thought, maybe a run a little further!! Once i got going she…

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