are f'ing stiff


that is all.

 

supertech springs say...... yummy SR head... I will chew it up because I am that stiff...... well if you put some stainless valves in, it will.

martin

 

i still have the stock valves.

i can almost guarantee with a big enough cam and incorrect lash that the supertechs will have the ability to beat the factory valve heads against the seats so hard that they will eventualy dimple and bend, causing lack of compression, and requiring either new valves or at least a valve job.

lighter inconel valves on the intake side are the answer, along with 6mm stainless/inconel exhaust valves. reducing the mass will reduce the momentum and hopefully get better life out of the seats.

the drawback is there will be a ~2 year limit on the head before it needs to be gone through and completely re done.

 

We've been using Supertech Springs on our race motor for the last year and a half with no problems. If the valve is beating against the seat, that means you're getting valve float. The profile of the cam is what determains the rate of open and close. I don't think there's a more aggresive cam then the Tomei's and we are running those without a problem. How exactly will the springs chew the head up?

 

how many hours have you put on your motors in the last year and a half?

 

In my time in the DSM world I never heard of problems like you're describing from stiffer valve springs, and people were running over 290 lbs compressed spring pressure on shimmed Supertech duals and very aggressive cams. Valve float can beat up valves and seats very quickly, but isn't the whole idea of the stiff springs and lightweight valvetrain to avoid valve float?

 

While I have not experienced it first-hand with SR motors, i have had this 'phenomenon' happen quite often on b-series hondas that i've built with all supposed 'top of the line' components and JUN step 3 cams, or toda step b cams. the cars made incredible power, and then would begin leaking at the valve seats. apon pulling everything apart, the stock valves would just begin to beat the hell out of the valve seats until it was no longer seating perfectly.

the powerbands were not indicative of valve float, usually the torque will fall off somewhat significantly if they are indeed floating.

it's pretty awesome that you guys haven't had any problems with it yet, but at the same time i don't know of the total miles or runtime your engines have seen when compared to the average daily driven street car that gets about 200 miles per week put on it combined with events at high rpm once or twice a month.

only time will tell, but either way, these springs are retarded stiff, a definite improvement in what I was previously using, and I'm excited to run them in my car.

 

I don't know, maybe I should put an hour meter my racecar.

 

he's put enough hours on the car to dial everything in and have it be the most powerful and the fastest in the usa, and practically the world.

 

Wow.. sorry for the lackadaisical response... didn't know it would get any kind of response... I was just poking at Matt with that post up top, because I specifically talked to him about this and it is a problem he has had in the past, like he mentioned. I have had this happen on a SR with hydraulics, mild 264's and supertechs, ferrea duals and jun duals. Again.. very different scenarios here from Mark's.. these were daily drivers that had valve seat issues after 40-50K miles past the swap/upgrades performed. I have done probably no less than a 100 SR valve spring jobs, which Matt can attest to, over the years and I do have a couple that stand out in my head because of the later complications.

Martin