I heard that RPW has stage 1 camshafts available. Anyone know anything about performance gains with it. Do you have to upgrade your valve springs to use it? Is there any other companies out there making cams yet??

Happy tuning.
p.s. Does anyone know of any GOOD machine shops around Denver,CO that I should take my head to to get it milled??

 

On a similar topic (And I'm sorry if someone's asked this already, but I don't remember reading about it) do the 4g93 and 4g94 use the same head? I'm sure one of our ever-knowledgable Mirage drivers may know best.

 

RPW designs their stage 1 cams to be useable with stock valve springs but it is always good to be safer if you can afford it. As far as I know they would need to see atleast one stock US cam to know what to do for a stage 1 or any other cam but if you know the lift, duration, overlap, etc that you want they can get a billet cam made to your specs.

The head should be nearly identical except MAYBE the 4G94 ports are smaller for better low rpm power/torque and ease of passing emissions (through the higher velocity). If someone would let me work on their car I could find out for you for sure and note any differences in combustion chamber volume, piston design (dished, shorter, valve relief yes/no), port shape and size etc.

MILLING your head: I would suggest against it but hey if you want the extra 1-2 hp go for it...it does give you better fuel economy too but there are limits to the amount of milling from the design of the head, the distance the valves are from the pistons, the size of the timing belt, and the amount your valve timing will be thrown off from stock due to milling. Extra compression on a stock 4G94 wouldn't be worth much in terms of HP unless you already had an aggressive cam profile and head work...go to a search engine and look up Bowling's automotive calculations. There he has already gone through and created "java" based calculators that input your engine information into the thermodynamics equations (that mechanical engineers use for engine design) to show you how much of a gain in power you can expect from raising compression and it isn't too much on a small low hp 4 cylinder.

If you do the work of pulling the head yourself get headwork as that is more worthwhile and they will have to deck your head slightly anyways. I recommend DPR Racing or RPW for the head work but DPR will no doubt be quicker since they are in the US.

 

The Lancer camshaft has teh same dimensions as the 1.8 camshaft just a different lift and duratrion standard for the 2.0 motor. If I was given the stock specs off a USA lancer 2.0 motor we could grind up a camshaft straight away.

Stage 1 cam doesn't need a valve spring upgrade but that would be dependant upon what the specs are of the stock 2.0 camshaft. If it is a fair chunk bigger than the 1.8 standard then a stage 1 2.0 may be equiv to a stage 2 1.8 and then we made need to do a valve spring upgrade.

IF you want to test a set out at a good price speak to vision imports and I am sure you can strike a deal with them on price for being a tester of a new product.

Finally do not mill the head excessivly causes timing belt tensioner problems amongst other things.

David Thomas
www.rpw.com.au

 

good point on milling the heads I was just about to say somthing about that the only thing I would have them do would be to just balance it real good thats all. About new springs honestly myself(I used to do rebuilds)I dont warranty the cams or the work if new springs aren't installed and most of us guys are like that just for CYA messures

 

Freakin' figures MSIE has an error as I click submit.

Anyway...diam i'd gladly offer my car but there's about 2,500 miles keepin' me from doing it. The reason I brought it up is cuz there are obviously companies like RPW who are already familiar with working the 4g93 heads and they'd be even more of a huge asset if they didn't have to learn the idiosyncracies of a new head. If they were the same there could, ideally, even be a core exchange deal. It's always good to have another possibility open...albeit a fairly expensive one.

 

Yup, they do core exchange.

 

hey gents i got a few questions here as to what i should be doing with my car. i have a few extra dollars i wanna blow on what else my car. right now all i have done is a custom made 3'' exhaust eliminating the cat, resonator and muffle. its 3'' from the down pipe back. i am looking to get cams for the car, along with adjustable cam gears. but before i do that i am ordering 700cc injectors, 255lph fuel pump and a perrin fuel rail. this weekend i will be port/polishing the head and intake. my question is, what size cams should i be going with. i was thinking 264in/272ext. please let me know so i don't have to write back on the forum telling everyone what not to do cause of personal experience

 

Wrong forum this is for the regular lancer not the EVO

WADAD

 

Has anyone volunteered as tock camshaft to RPW?? I have a Stage 2 and a Stage 3 sitting here (for the 4G93) that I would post for sale, if I find out that the specs are similar.

 

We do't need a stock camshaft - we already make camshafts specifically for teh 4G94 vehicles with profiles specific to those engines and vehicles. They do run different grinds to the 4G93 engines which will not really work well on these lancer vehicles