Manta B 2.4
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Thread: Manta B 2.4

  1. #1
    Opeler FinnOpel's Avatar
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    Manta B 2.4

    Here's presenting my '83 Manta B, and a bit about the project behind it.



    As the car sits today, it's got a 2.4 CIH out of an Opel Omega A, backed up by a Getrag 240 and a stock GT/E Manta rear, with 3.44 gears and an LSD. The engine retains it's stock bottom end, head is ported and has a 286/109/11,7 cam in it. On the intake side, it has 45mm ITBs with 340cc injectors and 45mm long velocity stacks. Exhaust is handled by a small tube 4-2-1 header. Fuel injection and spark (VAG wasted spark coil) are controlled by Megasquirt. I had the car tuned on a rolling road, that has a reputation for being very unforgiving and the result was 160hp/236Nm from the engine.



    Interior is from a GT/E Manta, with re-upholstered tartan Recaros, a digital dash fitted from a Kadett GS/i and a MOMO Prototipo steering wheel. Under the car I've fitted Koni Sport Short shocks wit H&R -50mm springs. Front brakes are 296mm from an Opel Senator B. Wheels are ESM 16/7,5 ET20, with 205/50 rubber. I'm planning on swapping the tires for 205/45, since they are rubbing on the arches as they are now.

    I started the project by stripping the running gear from my rusted out GT/E Manta and buying a Berlinetta shell, that was supposed to be in better condition. Long story short, it wasn't any better than the previous shell, and there was a lot of welding involved. The truth is, you can't find a perfectly good shell for an old Opel anymore and mine wasn't as bad as many others out there. Still I had to replace both sills, patch up the floors, rear quarters, rear valance panel, and the passenger side frame rail goose neck.





    I painted the underside myself, with epoxy primer and black urethane top coat. I had the main paint job done by a professional.



    The car retains it's original color, but the actual name or code of that golden color escapes me. It goes together really well with the bronze tinted windows I have on the car.



    Seems like I've reached the limit of photos you can add to a single post, but I'd be happy to share more about the project. That is, if anyone is interested!

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  3. #2
    Just Some Dude in Jersey The Scifi Guy's Avatar
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    Very nice to see your project!

    I found your air cleaner to be very interesting. I can't say that ever remember seeing a one-piece, foam, air cleaner on a CIH FI set up like you have it.

    (Okay, now everyone post pictures of one-piece, foam, air cleaners on other CIH FI set ups to really make me feel stupid. )

    Do they make a big foam air cleaner like that for the 6 cylinder CIH's?



    PICTURES:

    You can post up to 10 pictures in a Reply if you click the paperclip above the reply box. This method only loads the pics to that one post and the pics can't be seen anywhere else, but it is quicker and easier. You are using the Album picture posting method. This is good when you want to have pictures stored on this site so that you can put them in other posts again and again without having to upload them each time. It is also nice because it puts all of your pictures in one place. The Album system only allows 60 pictures in each album. After 60, you have to start a new album.

    Another way to use the Album system is to upload your pics to an album and then just copy and paste the one link for that album into a post.

    NICE work on your car! I have a 2.4 in my GT with a single side draft. I am also trying to install the 4 speed auto tranny from a Senator in one of my 1970's Opels. I also just bought a '75 Ascona/1900 Wagon, so now I have to learn about FI.

    Keep up the good work!




    (General questions: Are the 1975 and older Manta/Ascona/Luxus/1900's called "Manta A's"? What are the years that they made the Manta A's, B's, C's......Z's???)

    Last edited by The Scifi Guy; 06-22-2018 at 08:58 AM.
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    Manta history: https://en.wikipedia.org/wiki/Opel_Manta
    Ascona history: https://en.wikipedia.org/wiki/Opel_Ascona
    Too bad they didn't make a Manta C, although there was a FWD Calibra coupe(which makes an excellent engine donor).
    Last edited by Commodåren; 06-22-2018 at 10:17 AM.

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  6. #4
    Just Some Dude in Jersey The Scifi Guy's Avatar
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    Very interesting read! Thanks!


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    Opeler FinnOpel's Avatar
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    The Scifi Guy, yeah that's the Pipercross PX600 air cleaner. It came with a blank aluminum backing plate, that I had to drill for the throttle bodies. I don't know if they make them for six cylinder engines, but somehow I doubt they do..

    The problem with this setup is the heat radiating from the header, under the intakes. Pipercross also offers an enclosed airbox setup, that makes use of a remote cone filter. There's no room for that in the stock Manta engine bay though, so I had to go with what you see in the photo.

    Thanks for the photo advice and the compliments!

    Lähetetty minun ONEPLUS A3003 laitteesta Tapatalkilla

  8. #6
    Opeler FinnOpel's Avatar
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    Thought I'd share a couple of more photos of the project. I forgot to mention the clutch earlier, but here's a picture of that too. It's got a billet steel flywheel, an Opel 9" clutch disk and the pressure plate is a BMW 618 type. The CIH is pretty peppy with the billet flywheel, and there's no chance of slipping with this assembly. The BMW pressure plate is way stiffer than the original though, and it took some time getting used to it. Additionally, I had to modify the clutch pedal geometry to get it to release, since the Bimmer clutch seems to have a lot longer action than the Opel one.

    The other photo is from the passenger side front fender that needed some work. Funnily enough, the one I repaired had much better fitment than the driver's side fender, which has an original GM replacement part installed. The theory is, that considering the extremely long production run of the Opel Manta B (1975 to 1988), there's a chance that the fender I got is of very late production. Therefore it could just be that the moulds for pressing the repair panels, were starting to show their age.
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    Opeler samdog's Avatar
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    Thank you for sharing. Nice project. Nothing too crazy, very clean and looks like a lot of fun to drive. Enjoy.
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  10. #8
    Opeler FinnOpel's Avatar
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    Thanks! Yeah it's not too wild, but pretty snappy for an old Opel.

    I was thinking about going all out with it, and I was left with only one sensible and cost effective (yeah right) way, and that would be turbo charging the CIH. I guess the most sensible way would be to swap in a 16V C20XE engine and turbo charge that.. Anyway, neither of those options are all that appealing to me, because I like the ancient CIH and the induction noise of the throttle bodies/carbs. I feel no need, nor have the cash to go further with the NA setup though. That would mean upping the compression ratio and going for a much wilder cam with solid lifters. That would get me a 200+hp CIH but you know, reliability issues, fuel consumption etc. And like you said, it's a lot of fun to drive it as it is!

  11. #9
    Opeler samdog's Avatar
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    You are smart to do what you did. Lots of fun and very drivable. What you did wasn't cheap either, it all adds up.
    I am doing something similar with a Manta A. The body that I have is solid! Big plus...but I have had this car from the 90's. The motor is a 2.5 with a 1.9 head ported, 8mm valves, single side draft with fuel injection. I would like more information on your fuel injection. This is the way to get reliable, fun power. Thank you, Gregg

  12. #10
    Opeler FinnOpel's Avatar
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    Sounds like your Manta flies with that big CIH! What kind of pistons do you have in there, some domed Wössners? What kind of cam? I haven't really touched a 1.9 head before, but I'm guessing it has a pretty small combustion chamber, so your compression ratio must be pretty healthy with that stroker bottom end. Nice to see you've hung on to your Manta for so long, and keep on refining it.

    So my fuel injection, from back to front consists of:

    -MSD electric fuel pump
    -Dual 45mm KMS (A Jenvey copy) throttle bodies, fitted with 340cc injectors
    -2.0 CIH intake manifolds, with flanges welded on from a 3.0 CIH stock intake (got the stuff for free)
    -45mm long velocity stacks, and a Pipercross PX600 air filter
    -Bosch throttle body sensor, from a Motronic system
    -Intake air temperature sensor, fitted to the air filter backing plate, between the throttle bodies
    -Crank position sensor from a Motronic system, in it's original place at the bottom of the oil pump
    -Krause lightweight 60-2 trigger wheel in place of the stock Motronic damper/trigger wheel
    -VAG wasted spark coil pack

    All of this is controlled by the ATEcu V3 (Megasquirt) ECU, and tuned with the TunerStudio software. My plans are to install a pair of intake manifolds, that are originally made for the 2.4 head, and hook up a MAP sensor. As of now, I'm only tuning by using TPS as reference (Alpha_n in the tuning software). It works fine, but as there is no vacuum information, the mixture tends to be on the rich side on idle and with really small throttle openings. There's no real vacuum to speak of with ITB's anyway, but hooking up the MAP sensor would help with the low RPM tuning and fuel consumption. I'm planning on tapping vacuum lines from each TB intake tract, and then running them through a small container on to the MAP sensor. That should provide enough vacuum and keep the signal steady.

  13. #11
    Opeler samdog's Avatar
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    I have not completed my project yet. The body is ready. I have a 3.67 limited slip, 240 getrag, 2.5 block , 1.9 street ported head by Bob LeGere who also designed a cam. The compression isn't going to be crazy[ about 9.5]. I am looking to get an honest 145 whp when completed.
    Your fuel injection system looks great. I'm sure that my engine builder will be helped by your information.
    How much does your Manta weigh?
    I went to Lathi, Finland 15yrs ago to find the best Goldsmiths in the world.
    Thank you, Gregg

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    Site Founder Gary's Avatar
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    Here's a pic of Samdog's Manta. He hasn't seen it in a while.

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    Opeler samdog's Avatar
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    Wow! Nice Manta....does it still have the 2002 inspection sticker on it?

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    Site Founder Gary's Avatar
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    Quote Originally Posted by samdog View Post
    Wow! Nice Manta....does it still have the 2002 inspection sticker on it?
    It does!
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  17. #15
    Opeler FinnOpel's Avatar
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    Quote Originally Posted by samdog View Post
    How much does your Manta weigh?
    It weighs at around 1000 kilograms, with the tank full and a 75-80kg driver in it.

  18. #16
    Opeler samdog's Avatar
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    Quote Originally Posted by Gary View Post
    It does!
    I forgot what state it was registered in. It has been a long time and I don't even have Alzheimer's yet!

  19. #17
    Opeler samdog's Avatar
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    Quote Originally Posted by FinnOpel View Post
    It weighs at around 1000 kilograms, with the tank full and a 75-80kg driver in it.
    So that's about 2200lbs...not bad at all. must be a lot of fun. Back in 1973 the Porsche 911s, which was the top car exported to the US, was 2600 lbs and 175 hp at the flywheel.

  20. #18
    Opeler samdog's Avatar
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    There is some very helpful information her from our new Finnish friend. It is reliable, fun and plenty of power.
    FinnOpel likes this.

  21. #19
    Opeler FinnOpel's Avatar
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    Quote Originally Posted by samdog View Post
    There is some very helpful information her from our new Finnish friend. It is reliable, fun and plenty of power.
    I'm glad if it helps! Hope nothing gets lost in translation. In any case, if there is something more you'd like to know about my setup, just ask. Maybe I could try and share a photo of the dyno sheet, would that be of interest?

  22. #20
    Just Some Dude in Jersey The Scifi Guy's Avatar
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    Quote Originally Posted by FinnOpel View Post
    Maybe I could try and share a photo of the dyno sheet, would that be of interest?
    Yes, show us your dyno results!


    (This thread wouldn't let me just type a reply and said something about an "invalid thread". I had to quote the post to reply.)

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