Bad Valve Guides

[jrelyea828]

Alright so I noticed recently that after 2500 miles i lost two quarts. There was no smoke and no visible leaks. Come to find out I have worn valve guides and probably valve seals as well. Since i have to take my head apart to redo this. I was curious as to what sort of performance parts for a head rebuild everyone would recommend. I already have an adjustable camgear but thats it. I plan on getting tighter springs and 270 degree cams but what else should i get. any recommendations would be great

[TIBOevo]

port and polish. apr head studs. you could even use thermal barrier ceramic coatings on the valves. and the top portion of the combution chamber. maybe a cometic head gasket too. it jus depends on how much patience, money, and time you have.

[CaliMR]

It depends also on what $/hp you are willing to do. I am not in any way trying to talk ****, but you do not have a turbo kit or anything like that listed so I am assuming you are basically stock, and getting hp out of the NA lancer motors is pricey for the amount gained.

[senate6268]

Originally Posted by jrelyea828

Alright so I noticed recently that after 2500 miles i lost two quarts. There was no smoke and no visible leaks. Come to find out I have worn valve guides and probably valve seals as well. Since i have to take my head apart to redo this. I was curious as to what sort of performance parts for a head rebuild everyone would recommend. I already have an adjustable camgear but thats it. I plan on getting tighter springs and 270 degree cams but what else should i get. any recommendations would be great

First off, our engines only have one cam. Unless you've done a DOHC head swap, but I'm sure you would've mentioned that. New OEM head gasket and some ARP head studs would be a good start for reassembly. It'll save you the effort if you go turbo down the road.

In terms of valvetrain upgrades, our engines can't safely rev much higher than they already do so there's little need for anything more than stiffer springs for the higher degree cam. But while having the head prepped get a port and polish and a nice angled valve job so you'll have a nice flowing head. This is one of the Lancer's most restrictive parts that causes loss of power at top end.

[imalancerman]

If you want to do some power cheap, I got quite a bit out of port matching both my IM and my head and it cost me 20 bucks in bits. But I did already have the die grinder and air compressor. Just did the head yesterday and did it just like the IM only you only do the outer lip. If you go too far in, you'll hit your water jets and your head is shot. I can post pics of mine. I got some metal bits and sandpaper bits and it was easy. The ports are huge now. You can pick up everything you need at harbor freight. Like CaliMR said, you won't get a ton of horse out of an NA lancer but this is something that will help all of your mods in the future and you should notice benefits now with it. If you dont feel skilled enough, dont do it. I do also probably have a slightly longer list of mods than you so I probably can take advantage of it a little better. Just suggesting if your a do it yourselfer. BTW, Ive been trying to find this info out senate, can I raise my rev like 500 or even put it up to 7000 without any damage to the bottom end? I know I don't have power up there but just wondering if the block can take it?

[GPTourer]

I wouldn't waste the money. The car won't be a high RPM screamer with that head. Just get a $500 rebuild from a machine shop and put the rest of the money towards a turbo kit.

[imalancerman]

Or you can go to car-part.com and just get a used mirage head so you'll have a stage 1 cam and a working head. I paid 140 for mine shipped, did all the work myself, and its a champion head. cost me 180 to get the head and rebuild and port it myself.

[senate6268]

Originally Posted by imalancerman

BTW, Ive been trying to find this info out senate, can I raise my rev like 500 or even put it up to 7000 without any damage to the bottom end? I know I don't have power up there but just wondering if the block can take it?

RRM used to raise the redline to 6800rpm on their flashes a long time ago if, I remember right. So 7000rpm wouldn't be out of the question if you're actually making power past 5300rpm. In terms of the stock bottom end taking it I can't say. Nobody has run that high an RPM to test it out. A built bottom end and head could potentially see 7200-7500rpm and might still be making power that high with the right turbo setup.

[imalancerman]

6800? Everything I was seeing said 7200 for rrms flashes. Were these flashes available for stock internals? Hmm, I was just curious cause alot of my mods are for top end and I feel power all the way to the rev limiter. I have the tactrix cable and thought I might try raising it like 500 just to see what would happen but I dont want to if the block cant take it. BTW, you can find a whole motor for less than 500 dollars. I just bought a used head cause Im cheap

[Ozrally06]

I wouldn't port the head like every one is saying the 4g94 is already porter same exact engine as the 4g93 just some differences if you decide to go turbo
Ight crack the head and like some one else said just buy a used head or a whole engine that route would be cheap if you do it your self or like you want just build up the internals up can't go went with having stronger ones then down the road you can get a turbo and be able to push more than 8 psi

[imalancerman]

I didnt say port the whole head, I said port match it, meaning gasket match the exhaust and the intake on the head and polish the exhaust side. It shouldnt weaken the structure any as long as you dont go too far in. I did just the outer bit and it seems to help quite a bit. And its easy and cheap horsepower if you have the right tools, a steady hand, and a good eye. BTW, yes the 4g94 and 4g93 are the same separated only by .2 liters, but the mirage cam, and you can search, is the equivalent of a stage one cam on the lancer. I believe, if I remember correctly, the lancer cam is 250/256 and the mirage cam is 256/256. I know that the lift and duration was possibly slightly less that the stock lancer making it not so good for turbo but would work fine for NA.

[imalancerman]

Here is what Im talking about, sorry the pics arent a little better. You should only have to remove a small amount of metal from the intake side which I finished up with 120 grit and quite a bit on the exhaust side as you can see in the pics which I finished up with some fine grit emery cloth. Turned out well I thought. If you want a write up on how to do it, look for the thread on porting your own intake manifold and follow their instructions just dont go too far in.

[senate6268]

Originally Posted by imalancerman

Hmm, I was just curious cause alot of my mods are for top end and I feel power all the way to the rev limiter.

Without a dyno to show you where your engine's power really is your comment is very subjective. Most Lancers make peak power very early in the powerband. Unless you have high comp pistons and a built head or a turbo with a built engine the power curve shouldn't shift any higher with mods.

[imalancerman]

Well I mean the designs. The 4g93 intake is supposed to be top end, big exhaust is supposed to be top end, mirage cam, and port matched head. From my research, everyone is saying these mods are supposed to be geared towards the top end of the powerband. I was just curious cause like i said, it just FEELS like there is power. It could just be a placebo of some sort. I just wanted to find out by maybe raising the red about 500 rpm. I just dont want to do it and throw a rod. Thank you BTW for your help.

[jrelyea828]

i heard you can safely rev it up to 6800, you arent limited to 6800, but i guess people dont recommend going past that. and thanks for the all the help. i meant cam not cams. i wish it was a dohc haha.