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Author Topic: instaling 20SEH  (Read 2656 times)

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erubus

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Re: instaling 20SEH
« Reply #15 on: 17 July 2010, 15:05:39 »

cheers for that.  the carlton used an AR25 autobox as well, so shouldn't be too much of an issue.  am still unsure about whether the box needs any input from the engine, throttle position, manifold depression etc and how that would be got from the seh as it's on a manual atm.  i think if i go ahead with the conversion i'll go the whole hog and stick the manual in as well, i presume the carlonator's g/box to centre bearing prop would fit no problem.

I ran a cav with an SEH and a couple with eco's and to be honest i didn't think there was much in it performance/economy wise.  when my dad used to run the carlonator, he swore by the SEH, think he may be looking through rose tinted glasses, but he reckoned he got 40+mpg on a run.  I also have a high lift cam for an SEH.  decisions decisions.
 I have made no progress at all with the omega.  It's just sat on the drive since i got it.  money's so unbelievably tight i can't even save up the 45 quid to get the boy to come out with his tech2.  I'll be gutted if, after weeks of saving, he comes out and says that he can't find the problem.  If that happens, the engine will be ripped out smashed up a bit with a sledgehammer (to make me feel better) and weighed in, then the trusty old SEH will go in.
 Might have another look at it today, but tbh, it's a waste of time trying to figure out which bit of electronic wizardry is giving an incorrect signal just by looking at it and pulling plugs on and off.

as a footnote, I spent probably in the region of 400 on new sensors etc for my last ecotec engine in the space of the two years i had it, and spending on the SEH engine in the last fifteen years, zero, not a penny.  well a new sump from the scrappy cos the original went porous, but my dad bought that. oh, and a couple of fuel pump relays, but that doesn't count (turned out to be a dodgy pump)
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fastcav

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Re: instaling 20SEH
« Reply #16 on: 17 July 2010, 15:26:00 »

 Carlton gearbox will physically fit ok, but where you will run into bother using it is that its got a cable operated clutch, whereas the omega clutch is hydraulic. Any petrol omega box will fit the back of the 8 valve engine, but because the 2.0 ran a smaller diff it also had a slightly smaller diameter driveshaft so its nearly best to find gearbox and shaft from a 2litre, they also had slightly different gear ratios than the v6 boxes, but thats not a major issue. The dual mass flywheel from a ecotec engine will also bolt straight on, as both engines have 6 bolt cranks where the flywheel bolts on, so there are no problems with using the standard ecotec clutch setup, also as a point of interest, the standard exhaust manifold on the seh will line staight up to the existing ecotec system. Itd nearly be worthwhile finding a donor car in a scrappys as all the parts to convert from auto to manual are really straightforward bolt on bolt off items. I did my first gls auto in an evening, but i had everything on the floor to do it and the use of a ramp, which makes things so much easier, even though its not impossible to do on the floor, we also decided to fit an mv6 lsd on the same evening, but i also had the assistance of a mate called tiny, who is not as his name would suggest  :D
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erubus

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Re: instaling 20SEH
« Reply #17 on: 17 July 2010, 19:15:50 »

all the bits are still on the carlonator, including clutch.  As my omega is an auto atm, i imagine i'll be able to use the cable clutch and pedal box from the carlton as well as the propshaft etc.  good to know that the eco exhaust will fit the seh as well. i'm starting to warm tyo the idea of forgetting about trying to fix the eco and just crack on with fitting the seh.
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2woody

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Re: instaling 20SEH
« Reply #18 on: 21 July 2010, 14:30:22 »

Omega B clutch concentric release bearing/slave cylinder assy will bolt straight to Omega A cable-clutch gearbox.

the hydraulic system was designed to bolt to the same ring of bolts.
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