Club G40 Forum
Technical => Superchargers / G-Lader => Topic started by: prankstar2003 on March 15, 2009, 04:29:02 pm
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Hey, im new to the site and have heard that this is THE place for G40 advice. Im looking to do a fairly large conversion on my engine. Its a 1.3 atm mk2, but i'm looking to supercharge it. Was looking for around 150bhp with a GT inlet, and an eaton m45 charger. Apart from that, i cant make up my mind on what to bolt to my lump!
Any ideas would be grand!
H&S
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welcome prankster
first thing you need to do is work out what you need for the conversion to strengthen the engine you have so the compression ration and internals are good enough for a supercharger and 150bhp, work out costs on this and weigh them up against buying a G40 lump. also depends on whether you wanna just pop an engine in or prefer a challenge to rebuild and totally modify a lump and be different.
if i were you i would look into options before jumping into any rash decisions and buying bits you may not need
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Oi its you again! Ha! thanks for all your advice yesterday, taken some of it and joined up here too. Huze said that its possible to eaton a 1.0, he did it after all!
Whats going to need strengthening then? Isnt it as 'easy' as replacing bits with g40 bits? And it the challenge im after, but if i can get a cheap lump, thats more than an option
H&S
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Do you not think it's challenging enough to get an Eaton mounted and running on a G40 engine ?
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swap the engine for a g40 one. yes you could supercharge a normal engine but you'll have to run such a low amount of boost it's not worth the effort.
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I have no idea to be honest, is an eaton a challenge to get running then? If i was to buy a G40, i'd strip it back anyhow, and be tempted to replace many of the hard wearing parts, i.e. cams, crank and the like.
As regards boost, if the pistons, crank and gaskets are replaced with G40 ones, it essentially has the same displacement as G40 with similar compression ratio. Or is there something im missing? httuning.co.uk have done it! ;D Im open to ideas here, but work is no option really, the challenge is the enjoyment. And as regards finding a g40, theyre are expensive and theres the hassle of transporing etc. I have two 1.0l to play with, its worth a pop really. Even if it dont work!
Thanks though
H&S
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tbh if you look at a thread which is somewhere on here you will see how realiable a supercharged 1 litre is. and thats not very reliable. there is a few videos for it.
lasted about 2 miles
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Ha, is that all! 2 minutes of unadulterated fun though?
I have a few months until i get started, so i'll continue to greatfully take peoples advice, and consider the g40 engine option. Looking through here, theyre a little more numerous than i originally thought
H&S
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still a rare car though and getting rarer.
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could also check ebay.de for engines. ;)
at a minimum you could use a g40 crank and pistons in a normal 1.3 block with 1.3 head. But then you'll also need the proper g40 ecu, injection system and loom.
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would you also need a g40 throttle body or not
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yeah you would, or rig up some other kind of boost return valve mechanism
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Thats kind of what i was going to do. As the block and head castings are the same for the g40 and 1.3l, replacement of cams, crank and pistons should make it similar to the g40. Is the head gasket different too?
I was thinking of using an eaton to alleviate the boost return issue, as its not essential either. Was considering a forced induction carb, Thus alleviating electric problems. But have decided against it as this throws up as many problems as it might solve. But if anyone has any ideas, i'm open. Was thinking about possibly using a 1.3 mini carb since i have seen several of these with eatons on. Power may not be as much, but thats not what im after. It'll be dropped into a stripped mk2 anyhow, which a should reduce weight
H&S
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i've heard g40 blocks are slightly different casings - internall webbing for strenght. Not sure whether its true tho
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I'm not convinced that is the case, I reckon using a normal 1.3 block would work alright. I guess you're not going to be after huge boost levels anyway if you're thinking about using carbs etc... Personally I'd just get hold of g40 injection system, seems daft not to when it'll be straight forward, not /that/ hard to find if you look in the right places (as already mentioned ;) ) and you don't have to compromise between decent power and day to day driveability.
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told you there was helpful people on here
always good to here other peoples ideas so you can decide whats best for yourself
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Well the carb was purely an afterthought, would be much easier/better to go with the g40 injector system. Would also be easier to upgrade if i fancied a little more power!
Consequently, any idea where the best place to find a g40 crank is? And cams? I'v seen the shrick ones, and they are expensive. What do they offer over the standard cam? And also, is the crank breather essential, what is its main function, just to reduce pressure in the case?
H&S
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As i recall the crank breather on a 1ltr is just the pipe coming up to the air filter casing inside the air fillter allowing the gases to be re-burnt.
There is a non return valve and summat else inline on a G40.
Also if you use a CL 1.3 block wich has been done successfully then you either need a
complete G40 head or a set of Exhaust Valves as G40 ones are sodium filled for heat
dissipation.
Fred.
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i once heard that also pete, and also it was cast out of a different grade material to the standard block. not sure if thats true?
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I really doubt they'd bother going to the expensive of using a different material, I still think a normal 1.3cl block will work fine. Although if you are to use g40 management then you'll need to drill and tap the stub that the knock sensor fits on. At least with using an eaton you wont need to drill and tap an oil return.
Yes the exhaust valves are sodium filled on standard g40 heads. I reckon you'll get away without those though as long as you make sure the engine is in good order and doesn't get too hot. The big valve heads don't have sodium filled exhaust valves and even when used with turbos last ok. Although they do have a larger valve to seat contact area so can dissipate more heat that way. I think if you keep boost levels to 1 bar or less then it should be no problem, might get away with more too...
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So i block the knock sensor return on the ECU? I thought there would be some trickery to be done with the electrics, but was thinking it mite be i'd have to fit sensors. Seems to be the easier of the two though, thankfully.
Well as i said before, a conversion has been done on a standard block, and lasted, so i'll stick to it. And are we clear that the head will work fine, if boost levels are low enough?
A question on crank shafts though, were they different on the g40's to normal 1.3s? Or GT's for that matter? And can anyone suggest a decent cam. Not looking for break-neck performance, but which are best for running with an eaton and standard injectors?
Thanks again to everyone though, great to have be part of such an enthusiastic group ;D
H&S
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no I meant drill and tap the stub for the knock sensor which is on the back of all the blocks, just on a non-g40 it has no threaded hole in it.
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What, so is it a small nub of metal?
H&S