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So I have bought a 1978 Mitsubishi Colt Sigma as you can probably tell from the title. Ive got the looks all sorted in my head. Basically just some lows, a set of SSR Formula Mesh wheels which I have already bought(wide with low ET) and a bit of a tidy up don't want to change too much more on that front.. Now I want to do an engine transplant as anybody who knows me on here will know I like a bit of a skid now and again and the standard engine isnt much short of pathetic. Its claimed to be 115bhp when it was released but it feels pretty damn slow and drinks like there is no tomorrow. I could fix it and tune it but its never going to make a great deal of power or be reliable which is no good when parts for it are very very scarce. Id like to get close to 200bhp. Needs to be naturally aspirated as it will be going on bike carbs. So far I have come up with an MX5 engine, not much chance of the 200hp but very reliable, rev well, light, compact and exhaust on the correct side to avoid the steering box. I just need to check when I get home if I have a front or rear bowl sump as that could cause complications. I should also mention I am capable of doing all the work/engineering myself perhaps short of the bike carb inlet so that isnt much of a problem Does anybody else have any ideas and sorry for the essay? The car in question:  |
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Last Edit: May 1, 2012 14:08:49 GMT by Hudzoyne
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The obvious candidate would be a 4G63 Mitsubishi engine, either turbocharged or not. If you go for a turbo engine from a VR4 or an Evo, they come with very good power as standard, and of course huge aftermarket support. Import engines and suitable RWD gearboxes should all be relatively available. I believe that it may even bolt up to your existing gearbox?
A bloke I used to work with had a RWD Chrysler Galant running a 4G63 turbo in Improved Production circuit racing, with about 350hp. It was a weapon!
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See those engines arent what id really call cheap when your looking at £1000 for an engine. I don't know of any readily avaliable boxes that will fit. Mine will apparently work yes but I cant see it taking too much power for too long when it breaks where the hell do I find another? Plus I'm really not looking to go turbo as the sound just isnt the same as a screaming N/A they all just sound a bit dull
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Depends on your local market, I suppose. In Australia, Sigma parts are everywhere because they were manufactured here, and MX5s are really rare because nobody buys convertibles here. There are non-turbo 4G63 engines around in most 2 litre Mitsubishis from the 1990s and they are good motors. Not as fast as an Evo, but they should be available cheap and will swap in to your car easily for a useful power upgrade.
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see here there are pretty rare curse word all sigma parts avaliable so i need to be careful what i stress/break
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How about a VG30DE from a Nissan Z32? Plentiful, cheap and over 220hp stock. The downside is it's pretty big but it if fits it's a fairly cheap way to over 200 brake.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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Looks like you could easily fit a six-cylinder in there. Maybe some sort of BMW straight six? With 6(!) bike carbs? ;D
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God a Sigma on the road here is it an import? Those old motors are pretty bullet proof though, just don't get over eager with the gear changes you can pull the stick straight out of the box! First, second, third, fo - oh curse word
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I can think of two engines that could go very well on bike carbs and hit 200hp easy: -2.4 straight four (preferable twin cam),4G64 (http://en.wikipedia.org/wiki/Mitsubishi_Sirius_engine) -3.0 v6, 6G72 (http://en.wikipedia.org/wiki/Mitsubishi_6G7_engine), 2 sets of Triumph carbs will do nicely. Both available in RWD format, so get the matching gearbox and you only have to worry about the propshaft (not really  ) Like the car, could really turns head when modified. |
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 Click picture for more |
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I was under the impression that most Mitsubishi 4 cylinder engines share the same gearbox bolt pattern, so a 4g63 shouldn't be a problem to install. I am assuming yours is a 2 litre Astron motor? In Australia ours had a 2.6, and I know of one that is run in Targa Tasmania (in a Scorpion, what you guys might know as a Celeste i think? Basically Sigma 2 door) that is taken out to 3L and is an absolute weapon. These also came in triton units (L200 I believe, and probably later versions as well). I have heard from local rally guys that the 2.6 + a set of Webers and headers/exhaust is good for 100whp and oddles of torque. Given your budget and it's bolt in nature it sounds like a good option to me? RPW in Western Australia used to have a lot to do with these motors but no longer has the information on it's website - they might be worth an email though? www.rpw.com.au |
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I had a Debonair with a 2.6 Astron four pot and for a big car it did go really well.
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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How about a VG30DE from a Nissan Z32? Plentiful, cheap and over 220hp stock. The downside is it's pretty big but it if fits it's a fairly cheap way to over 200 brake. Trying to keep a light and nimble engine in there really although I have no doubts the VG30DE is an awesome engine I loved my 30E in the 300c. Looks like you could easily fit a six-cylinder in there. Maybe some sort of BMW straight six? With 6(!) bike carbs? ;D I think I should at least limit my cross breeding to japan only...maybe God a Sigma on the road here is it an import? Those old motors are pretty bullet proof though, just don't get over eager with the gear changes you can pull the stick straight out of the box! First, second, third, fo - oh curse word Nope not an import  English car thankfully made the insurance a lot easier I can think of two engines that could go very well on bike carbs and hit 200hp easy: -2.4 straight four (preferable twin cam),4G64 (http://en.wikipedia.org/wiki/Mitsubishi_Sirius_engine) -3.0 v6, 6G72 (http://en.wikipedia.org/wiki/Mitsubishi_6G7_engine), 2 sets of Triumph carbs will do nicely. Both available in RWD format, so get the matching gearbox and you only have to worry about the propshaft (not really ) Like the car, could really turns head when modified. See I do very much like the idea of keeping a mitsi engine they just really aren't that plentiful and although they will do good power its going to cost good money I don't see the benefit of spending lots of money tuning an existing engine when you could get the same or more power from a simple swap. My reasoning for the MX5 engine is that they are very small, light, cheap, very plentiful and lots of aftermarket support. Unfortunately though My engine is a front bowl sump and the mx5 is rear which would cause lots of headaches getting a sump made which I would rather avoid  |
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Last Edit: May 2, 2012 9:16:37 GMT by Hudzoyne
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Its less work than you might think modifying a sump, as long as there isn't physically a big lump of pump sticking down into it, it can be as simple as cutting the bowl off and spinning it round then modifying the pick up pipe to suit.
Our old sigma wagon didn't go 'that' badly considering it was always loaded to the roof and MPG was mid 20's to almost 30. Agreed 2.6's are better if you could find one but i don't think they were as tough. What about a turbo?
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MX5 engines don't have much more power than your current motor though! You said that your engine is rated at 115hp, which is exactly the same as a 1.6 litre MX-5! The 1.8 litre is only 130hp, it's really hardly worth the bother.
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I think that you should use the SR16VE N1 Nissan engine, 1.6 and 200bhp out of the box, should fit onto a SR20det 'box too J |
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MX5 engines don't have much more power than your current motor though! You said that your engine is rated at 115hp, which is exactly the same as a 1.6 litre MX-5! The 1.8 litre is only 130hp, it's really hardly worth the bother. It will be tuned a bit though, There is no way this engine is producing 115bhp now more like 80 at a push its seriously seriously gutless and so slow revving even after a good service and tune up. I think that you should use the SR16VE N1 Nissan engine, 1.6 and 200bhp out of the box, should fit onto a SR20det 'box too J And where would i find one of those?  Its less work than you might think modifying a sump, as long as there isn't physically a big lump of pump sticking down into it, it can be as simple as cutting the bowl off and spinning it round then modifying the pick up pipe to suit. Our old sigma wagon didn't go 'that' badly considering it was always loaded to the roof and MPG was mid 20's to almost 30. Agreed 2.6's are better if you could find one but I don't think they were as tough. What about a turbo? Id really like to keep it naturally aspirated but to be honest I think I'm going to have to go turbo for the goals I want. Cheap good power tunability aftermarket etc |
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I don't see why a MX-5 drivetrain would be a lot cheaper than an drivetrain from a L200, Delica or Shogun.
A 2.4 liter from the same engine family would be a no brainer for me compared to 1.6 from a completly different brand.
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Click picture for more |
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Another vote for the 4G63t. And there's even a nice handy build thread about putting on in a 'very' similar body shell. If you click the photo link below Chris |
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I think that you should use the SR16VE N1 Nissan engine, 1.6 and 200bhp out of the box, should fit onto a SR20det 'box too J Sadly they are a FWD block which has a different bolt pattern and thus won't fit a RWD SR box. Actually a RWD N/A SR wouldn't be a bad choice. An S14/15 import engine is 165hp stock and there's a ton of aftermarket bits for them. 200hp isn't a problem Front sump too. They're not common but when they do come up they're usually reasonably cheap as most people want a turbo. |
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1962 Datsun Bluebird Estate - 1971 Datsun 510 SSS - 1976 Datsun 710 SSS - 1981 Dodge van - 1985 Nissan Cherry Europe GTi - 1988 Nissan Prairie - 1990 Hyundai Pony Pickup - 1992 Mazda MX5
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English car thankfully made the insurance a lot easier
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