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!

Continue reading
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.  

Continue reading
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…

Continue reading
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…

Continue reading
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…

Continue reading
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…

Continue reading
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…

Continue reading
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…

Continue reading
OPEL

Time for the first shakedown!

Today was a big day! we finally hit the road for the first shakedown of the A series. Apart from a couple of niggles and i need a new battery as the battery doesn’t hold its charge, it was a good run around the block. The engine seems to have a nice bit of pull to it so I’m looking forward to the time when its run in and i can get it properly tuned and open it up! I need to get the temp gauge working as that not reading so I’m not to sure how hot she is…

Continue reading
CIH Engine

Engine all setup!

Finally, the Omex loom is all setup and everything tested and now we are all balanced and setup and ready to go. I think there will be a few little tweaks needed to the balance once we have had a run but i think its good enough for a test run! I need to sort out why it looks like the alternator is not charging the battery? could be a loose wire so that is the next thing to sort out and then we are all set for the first run out for a very long time!!!!     http://www.theopelproject.com/wp-content/uploads/2020/05/The-Opel-Project.mp4

Continue reading
Uncategorized

Cam timing info

CIH Cam and Ignition Timing  Originally Posted by GTJIM . . . Timing the cam is one of Opels little endearing foibles! Even the Factory Service Manuals cam be misleading as the drawing of the engine is actually WRONG in some of them – nice huh! Fortunately the picture of the crankshaft keyway position and the text is correct. The keyway in the crankshaftMUST face upwards and #4 cylinder be at Top Dead Centre with the camshaft turned so that the valves for #4 cylinder are closed ( the cut outs in the cam for access to the head bolts will be in the correct position as this setting). Once the cam wheel is…

Continue reading

Popular posts

GM/Opel CIH Engine Timing Chain Guides & Potential Problems

Im writing this little post on some of this issues i have encountered when building my Opel Manta CIH engine due to the differences between the Original GM/OPEL timing...

Finishing the Exhaust

I have finally got back round to doing some more work on the car!! The summer has been a bit busy with work so not much time has been...