Manta hatch Posted January 19, 2020 Share Posted January 19, 2020 It’s about time I did a build thread building this car to use in road rally stage events with the help of my father who is a 30 year manta nut who’s turned me from fwd Astra gtes novas in to opel rwd machines 🙂 i already have a mk1 cav saloon running national hot rod spec xe and another spare saloon and another spare coupe 🙂 i have made a good start pics to follow etc Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. I got most of the kit fitting before I had the shell blasted the car had been painted and looked straight As a die I could not believe how much filler was in the rear quarters for no reason at all filler straight over the top of the old paint etc but the paint job was very good I think they did it to have a pin straight car which it was but I hate filler so it has all been bare metalled Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. 5 Quote Link to comment Share on other sites More sharing options...
Manta hatch Posted January 19, 2020 Author Share Posted January 19, 2020 Car has now been blasted and on roll over spit to stitch weld add link boxes for axle a few extra gussets here and there I want it to be able to take them back roads flat out with out twisting etc i am stuck on engine I have many xe engines I have carbs, jenveys, slide bodies etc but I have C20let in my Astra gte and it seriously moves running around 300+ hp i have all the parts to build another c20let our 2 🙂 but some of the road rally events won’t allow turbocharged engine so I am stuck I would really like to get frontera block and cut 24v head would be interested in any info people have on building a 2.4 16v cih car is going to have big tunnel fitted I have an abundance of 1.8 boxes but they are shit I have done 3 in 2 years with 240hp+ xe bolted to them So I have got my self an r25 cable box and a r 28 hydro box have also been looking at rx8 boxes and Sierra Cosworth 2wd box just have made up my mind yet on the plus side I brought a spoiler of a member which is very good only to find I have a genuine 400 thinner type spoiler already in the unit plus another exclusive one it’s genuine twin lights I am after !!! also peoples thoughts of rear end I have exclusive bumper and standard gte carnt make my mind up there this is were it’s at now many photos etc to come I want to try and have it done for summer but we will see 🙂 You may see many old Vauxhall’s Opels on my pics I think me and the father have an obsession 🙂 Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. 6 Quote Link to comment Share on other sites More sharing options...
Julian Posted January 19, 2020 Share Posted January 19, 2020 BRILLIANT John. I.m thinking who would want to go anywhere sightseeing when everything of real interest is in your workshop, I just can't wait to see what replies you will get from the lads when they see this lot!! Let's have some more pictures mate. Quote Link to comment Share on other sites More sharing options...
ANDY ABBOTT Posted January 19, 2020 Share Posted January 19, 2020 (edited) Looks a nice project, and that's some garage you have, and by the looks of it full of treasures too 👍 would love a dig in there 🤣🤣 Edited January 19, 2020 by ANDY ABBOTT Quote Link to comment Share on other sites More sharing options...
mantasrme Posted January 20, 2020 Share Posted January 20, 2020 Nice looking build and an excellent shell to start with by the looks. One question though, you say road rally/stage events. But you can't run an arched car on road rallys (unless they have seriously changed the rules in the last few years since i stopped doing them. Unless you mean the new closed road stage rallies, which shouldn't stop you running a LET (although you would need a resitrictor). Personaly if you have the availability i would run an XE on throttle bodies, should give you plenty of power in a manta with a little tweaking and you have spares if the worse happens. For info on the 16v head for the CIH look at risse-motorsport.de but be warned it is nothing like a cheap option. Its also a lot heavier than the XE The RX8 boxes are very strong and easily available and fit with the use of an adaptor plate. However the gear lever is around 4" further back than on the manta box. I'm fitting one in my project but i am sat virtually on the floor and a long way back anyway so it will fall nicely for me. Quote Link to comment Share on other sites More sharing options...
H-400 Posted January 20, 2020 Share Posted January 20, 2020 Looking great, nice mancave. Miss the fridge. Quote Link to comment Share on other sites More sharing options...
Buz Posted January 20, 2020 Share Posted January 20, 2020 This is good info on 16v cut down but you need to google translate http://www.mantawelt.de/cih16v-projectone-07.htm 1 Quote Link to comment Share on other sites More sharing options...
®evo03 Posted January 20, 2020 Share Posted January 20, 2020 Two pics above dont look like a manta. Great project. Shed looks alot like mine, i think if i retire now, id still be going at retirement age! Really luke the original colour, sky blue? Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted January 20, 2020 Share Posted January 20, 2020 What power do these Frankenstein 16v CIH make? Quote Link to comment Share on other sites More sharing options...
Buz Posted January 20, 2020 Share Posted January 20, 2020 I’ve no idea but I would think it would be similar or slightly less than the 400 cosworth head. Quote Link to comment Share on other sites More sharing options...
H-400 Posted January 20, 2020 Share Posted January 20, 2020 (edited) Got a few friends that has done the rebuild. Power is compareble as the "400" head. Is still a tough project to do, one of the headbolts of the 24V has got another lokation than the 4 cilinder block. This is an example of such a shortened 24 head, the owner wanted to copy a "400" engine and did even copy the front-covers of the camshafts and the valve-cover: Project images are available to Club Members Only, Click to become an OMOC Member. He build an exact copy of the original Kadett-400 Edited January 20, 2020 by H-400 2 Quote Link to comment Share on other sites More sharing options...
mantasrme Posted January 21, 2020 Share Posted January 21, 2020 (edited) 13 hours ago, Jessopia74 said: What power do these Frankenstein 16v CIH make? Risse sell a complete 2.4 engine making 315Bhp Although its nearly £24K for it Edited January 21, 2020 by mantasrme Quote Link to comment Share on other sites More sharing options...
Manta hatch Posted January 26, 2020 Author Share Posted January 26, 2020 Yes unit is my fathers and yes it is full of manta cavalier goodies 😁 (will get you some more pics more cavs manta next door and outside 👌) car is for closed road stage rallies and road use to show the local Mk2 boys how to go on around these back lanes ..... engine I cannot decide I built a c20xe 87mm omega slippers steel rods skimmed early lightweight crank to make even lighter 🙂 opened ports valves ground 30 45 anderson race engine 085 race camshafts sbd steel pump gears cosmetic gasket etc etc etc running Jenvey 45 s MBe mapped at ap race engines it’s putting out just shy of 250hp fitted in my mk1 cavalier saloon with zf slip diff 9k rpm limit and it’s fast but I feel the manta is going to need more 🙂 hence me thinking c20let as my Mk2 Astra is scary fast running c20let at 300hp but I do think that manta would be a hand full as it come on boost others opinions with a let in manta would be good I found standard xe with cams and 45s in cavalier to go very well . I do have a few valvers I have more of an addiction to the engines than the cars I think ..... will get more pics for you all 2 see had a couple hours Saturday started on the metal work not to much more redoing what previous owner had done it looks like the pigeons were welding 😭 and I want to add floor reinforcements no spare wheel well etc like the genuine 400s were More pics this week Project images are available to Club Members Only, Click to become an OMOC Member. Project images are available to Club Members Only, Click to become an OMOC Member. 2 Quote Link to comment Share on other sites More sharing options...
®evo03 Posted January 27, 2020 Share Posted January 27, 2020 Tried an c20 let, a bit scarey, especially on back roads, cant drive it hard as you are timing whats in front of you before the boost kicks in, it kinda holds you back, and you are also thinking, i should have nailed it there, i shouldnt have nailed it there......... Think you have hit the nail on the head, 45s xe, fast cams, a few sensible mods, maybe a stronger box, type9 ford, or omega. Seen a project with fwd xe box plated and using a bmw box.Stronger back axle! Maybe Looks like a good shell, can you weld a cage in solid? Work looks solid, have fun! 1 Quote Link to comment Share on other sites More sharing options...
Jessopia74 Posted January 28, 2020 Share Posted January 28, 2020 Just a word about type9 box- they are no stronger than a std Getrag unless the gears are all replaced. Quote Link to comment Share on other sites More sharing options...
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