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PostPosted: 09 May 2016 11:53 
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Hi Guys,

I've just started racing a '96 Lancer MR (4G92 Mivec) in the 2kCup. Had my first race, an hour long enduro, at Hampton Downs on Saturday.

After around 1 lap on track, the car loses power high in the rev range. On the road it's fine, plenty of grunt all the way to red line, but I'm guessing the sustained high revs/temps on track are effecting it.

After reading through many of the threads on here, I'm thinking it must be oil or oil pressure related.

I'm currently running 15W/50 Penrite fully synthetic race oil. I'm getting conflicting advice, regarding using a thicker oil, a thinner oil, mineral or synthetic. Hopefully someone on here has come across something similar with their cars, and has the answer!

Cheers,

Sam


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PostPosted: 11 May 2016 22:08 
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Hi Sam

How many k's has the car done?
There is a bit of an inherent problem with wear in the cam trays where the k's are up and hasn't been entirely clean. They tend to drop oil pressure up on the big cam.
Best way to confirm would be to fit an oil pressure guage up in the head.
If it's like mine you'd have good pressure down low and then drop away after going on to mivec. The hotter/thinner the oils gets the more pronounced.
Oil spec wise what you are running is probably fine. I've chosen valvoline vr1 10w-40 and it's been very good.

Cheers Craig

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PostPosted: 12 May 2016 08:59 
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Thanks Craig,

It's done 225k, so what you're saying makes sense. I'll fit an oil pressure gauge this weekend and check it out.

If it is the cam tray, are we talking a major to replace, or fairly easy?

Cheers,

Sam


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PostPosted: 14 May 2016 20:36 
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One trick to getting another tray is knowing that the new tray doesn't have the same wear issue.
I can't tell you what to look for specifically either sorry. As I haven't seen it myself.

As for swapping the tray not too much more work beyond a cambelt change. You take rocker cover off then the cam tray leaving the base head in place. You'll need some of the three bond gasket sealer stuff for putting it back together. You may want to do camshaft seals at the same time. Possibly cambelt stuff depending how old the belt is.

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PostPosted: 25 Jun 2016 11:33 
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Well, finally got around to fitting an oil pressure gauge. Once up to temp, pressure is at around 80psi on the small cam, and drops to around 40 once mivec engages. After a good hard thrash around some twisty back roads, it drops down to 60 and about 35. Mivec still engages, but doesn't seem to have the same pull as it should. The engine is also very reluctant to rev past 7000rpm, almost feels like it's hitting the rev limiter.
After backing off for a while and letting everything cool off a bit, the oil pressure comes back up slightly, and I can get a few more revs out of it, but it's still a bit sluggish. This is all with brand new oil and filter.


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PostPosted: 25 Jun 2016 15:19 
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Yep that sounds pretty much the same scenario as mine with the pressure drop. The issue has to be to do with leaks from galleries in the head that are only used on mivec.

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PostPosted: 25 Jun 2016 16:59 
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So, cam tray you reckon?


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PostPosted: 26 Jun 2016 21:45 
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Yep, that's my pick.

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PostPosted: 26 Jun 2016 22:24 
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Joined: 08 Mar 2010 07:31
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Location: Auckland
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Slightly off topic, but i was surprised you can use the Mivec Lancer.
I thought it was a typo in the list as all other Mivecs are excluded

Galant (excludes MIVEC) 1997
FTO (excludes MIVEC) 1997
Lancer 1999
Legnum (excludes MIVEC) 1997

I am planning to enter 2k in the next year or two and really wanted to use a CJ4A so thats good news to me

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Peter Lee
Broomfish Automotive Parts Specialist
http://www.broomfish.co.nz/shop/


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PostPosted: 28 Jun 2016 13:16 
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broomfish wrote:
Slightly off topic, but i was surprised you can use the Mivec Lancer.
I thought it was a typo in the list as all other Mivecs are excluded

Galant (excludes MIVEC) 1997
FTO (excludes MIVEC) 1997
Lancer 1999
Legnum (excludes MIVEC) 1997

I am planning to enter 2k in the next year or two and really wanted to use a CJ4A so thats good news to me


Yeah, they just don't want the V6 Mivecs racing. There's only one other Mitsi in the class, a non mivec FTO. If I can get this issue of mine sorted, I think it will be a pretty good little car, keeping up with most of them through the twisty stuff, just getting left behind on the straight.


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PostPosted: 28 Jun 2016 13:18 
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Also, does anyone have a part number for the cam tray? Going to try and get a price for one out of Japan, makes it easier to get the right part, especially with the language barrier. Thanks again.

Edit: Never mind, looked in the parts number threads. Clever me.


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PostPosted: 28 Jun 2016 17:04 
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Well hell. A brand new cam tray is only $40 cheaper than a complete motor done 45,000km. Looks like it might be an engine swap.


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