You think the seal damage could be caused by this...

On higher mileage motors the valve stems on poorly maintained cars can wear a slight lip from where they're used to traveling. Then when you put higher lift cams in you push the valves past that lip accelorating wear on the seals by an edge passing them rather than a flat surface...

of am I just fishing here?

 

Stock Cams Lift:

Int - 10.0mm
Exh - 9.5mm


HKS Cams Lift:

Int - 10.8mm
Exh - 10.2mm



You're talking about a difference of only 0.7-0.8mm for each.

 

Superhatch,

...not bad bait, but I really don't think the fish are biting on it. With this theory, I'd think the "lip" would probably not be as pronounced on cars with as little mileage as most cammed Evolutions right now.

 

...but the question still remains, is that enough?

 

I was under the impression we were comparing our cars to DSMs again since his name is 92TSi and this might have been something he experienced in the DSM community, in which case a lot of DSMs are higher mileage... I agree that on an Evo this just wouldn't be feasable. I personally have 0 oil consumption in my Evo with cams. HKS 272s

 

Good theory Superhatch. The nice part about 1G DSM valvetrains is that they were pretty beefy. Evo is an entirely different beast. Everything is lightened in the Evo valvetrain. Buschur stated in a post awhile back that the Evo springs were weaker than a 1G spring with about 100K on it. Not that this is always a bad thing. I'm really waiting to see the pictures of the car with HKS 264s as promised yesterday. Apparently there is interference with the retainer and valve seal on anycam other than stock

 

Why not just call HKS and confirm with them. I'm also surprised why none of the tuners have replied to this. They would be the ones who would no for sure.

 

The WORKS 269 Cams have been designed specifically to work with the stock valve train. We neither heard nor witnessed anything related to this issue with our cams. We have over 20,000 miles with the 269 cams on a stock valve train on one of our cars... zero oil consumption, just a smooth fat power band with an almost stock idle.

 

...but what is the lift on those Tyler?

 

How much power are you looking to gain with WORKS cams as well??? The same as an HKS 264? 272?

 

On the WORKS website, they say a gain of 29hp/29ft torque gains with their cams and proper tuning but they do not tell you the lift

 

Something else worth noting is the fact that most mitsubishis exhibit leaky valve stem seals when the miles get higher. Aftermarket cams or not. Look at any old galant. lol I don't know if I have seen one that didn't smoke.

 

I have not been using any extra oil in my car and I have had these cams in for about a year. No problems yet "knock on wood" . I doubt there will be any problems with the higher lift. If it was perhaps 1.2-1.5mm more then you would have a problem. But the HKS cams just dont have enough lift to cause damage to valvetrain. The only thing you could rely do is upgrade the valvetrain for some higher rev's.

 

I dont think Works is a rip off...but I do wish they would post the specs of their cams on the website. There is no real reason they shouldn't in my opinion and other shops need to know this to tune for it accordingly. Aren't the 269s actually from blanks and not regrinds?

 

I believe you meant "over priced".