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Kiran Thomman » Blog Archive » Mitsubishi Lancer 4G15 DOHCed
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Mitsubishi Lancer 4G15 DOHCed


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Before I start I must confess thatthe DOHC head conversion for the 4G15 SOHC that’s been done on my Mitsubishi Lancer is nothing much to rave about. It’s not much of a mod besides the Turbo’s and the remapped ECU’s.

Basically what the modification does is improve your power output from 87 bhp to 103 bhp. Also owing to the twin cam it delivers power in a more efficient aggressive manner. This is something that I have gotten used to loving since my Palio S10. The head conversion is not going to drastically transform your car with mind blowing results. But is a start or a base to achieving the same with satisfying results in the LONG RUN.

The first modification that your Lancer needs and which mine desperately needs at this point is better fuel flow which is a big negative for this car world over. It’s because of the factory pump settings to achieve mileage for this car plays foul. The best way to overcome this is to fix a fuel pressure regulator and set it to 3.3 bar and provided you can gauge your throttle well shouldn’t see your mileage drift south. My car at although perkier at this point is gasping for fuel and so unless I fix one I am not going to see much gain from my DOHC conversion. I should have one in two weeks. However for anyone with this car I recommend the best mod before intake, exhaust etc would be to go for a FPR.

The reason for choosing the Lancer was because this is one car that can be modified with satisfying results and the amount of after market modifications are probably the best. Brake, shock body upgrades this car has it all. So this is a long term project and will take some time. One thing I like is this project can well be within my budget. Till date I have spent just over 3 lakhs for my car including cost of car which was what I wanted. Future upgrades like Bilsteins will hike it a bit more but with all modifications I am looking at a sub 4 lakh car.

Now to start off I was initially planning on hooking a Mivec probably a 4G92. Its been done a lot in India. However while researching I stumbled upon the RPW website which recommended the DOHC upgrade. This was quite appealing as this would mean a legal car as I don’t have to change engines and get it endorsed (Something that’s not possible at least in Kerala). Moreover spares also post minimal problems if I continued the 4G15 route. So the plans were hatched. You can get a DOHC conversion from RPW for $1200 (AUD I think) minus shipping. But when I finally decided they were in short supply. I found out that these originated from Japan so I tracked a supplier in Japan who scraps cars. I then sent him the relevant pictorial sections like timing, head, exhaust etc from the 4G15 workshop manual and asked him to dismantle the same from an existing car. He would then send me pictures of dismantled sections so I could choose what I wanted and what I did not. It took almost 3 weeks to get all the parts organized. As I had myself not seen this engine it was more difficult as I had to compare my Lancer to the pictures on the manual. I also had to make sure I didn’t ship more than I wanted to bring down shipping costs. The pictures below are the parts that were procured. I have circled out some common parts in white which need not be shipped. Everything else needs to be shipped. The timing tensioner and springs are also the same but have not been circled out. The water pipe the lower timing covers in picture 1, the front engine mount bracket (looks similar to existing one but this is where the idler pulley is mounted) and lower timing covers in picture 2 are parts that should not be left out.

The cost for the same is approx $500(dismantling + cost of parts). The package weighs 50Kgs. Japan post will ship for Rs 22000/- however people warned me that there is no tracking once it entered India. So I had a close friend use his account with DHL to get it to me and cost me another 27K for shipping it would cost Rs40000 if you don’t have a DHL account.

Customs held up the package in Delhi saying it’s restricted/ value is wrong so I had to send them a proof of value, a Chartered engineers certificate etc. It took a week to clear. Let me tell you shipping and customs is a pain and I would not do this again so unless you have some way of handling this, it’s very risky.

The head and parts are a direct bolt on and I supervised the installation of the head and timing belts etc with my mechanic who is a good at what he does. But still I had to point out the timing and mounting procedures from the manual and everything went like clockwork. The only three modifications are

1)There is no air temperature sensor port in the intake manifold of the DOHC so this had to be shifted to the air intake hose. All other connections are direct fit.
2)The exhaust on the Indian Lancer is a 4-1 the DOHC comes with a 4-2-1. So I had to make a 2-1 converter between the primary and the secondary temporarily till I fix headers. But I feel the initial Lancer petrol had a 4-2-2 as I managed to find a packing for the same for a Lancer at a spare parts store.
3)Some of the water hoses need to be modified (read shortened or turned) to fit.

Well everything is fine except my Lancer is gasping for fuel as its not getting enough pressure. So will have to fix the FPR and let you know. Here are the pictures of the engine bay after the install.

Im running Shell Helix , Iridium’s ( came with the head probably the previous owner was like minded!). I have also installed a Green Cotton Storm (more on that later). Engine is much smoother than the SOHC. The engine spec’s state that the power should be 110ps/80.91 KW @ 6000 RPM and torque should be 14Kgm/137.29 Nm @ 3000 RPM Hope this helps someone.

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4 Responses to “Mitsubishi Lancer 4G15 DOHCed”

  1. I, my 4g15 dohc engine giving slight tapet ni\oise, how to remedy it, please. uditha from sri lanka Says:

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    HI, my 4g15 dohc engine giving slight tapet ni\oise, how to remedy it, please. uditha from sri lanka

  2. admin Says:

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    You should ask your mechanic to set the tappet clearance to the recommended one. I don’t thinks its much work for a proper mechanic. To know the clearance required you should probably download the 4G15 Engine Workshop manual. Try a google search for it. I located one at the following link

    http://indy.pp.ru/GDI/Docs/%21Motor%20Repair/E/4g/PWEE9520-ABC_ENGINE_4G1_SERIES%28E-W%29_WM/PWEE9520-ABC_ENGINE_4G1_SERIES%28E-W%29-11A.pdf

  3. Faraz Says:

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    dear i m faraz… i also have this 4g15 DOHC Engine…. the map sensor is misplaced…. i searched everywhere… but i didnt find its map sensor part no and pic…. noting i found…. pls help me i need this Map Sensor… pls send me its pic on which the part no. is showing.. pls i will be very gratefull to u for ur this little act of kindness… pls i want pic… or if u can deliver me the sensor soo thts much better… my mail id: umairint@live.com

  4. Henry Says:

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    i like the build quality of the Mitsubishi Lancer plus it looks very cool too.

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