Any one running kelford 272 on stock head
Is he running singles or dual springs, and what is the limit on singles because i keep getting different answers about them; i would like to rev to 8500 on my summer project myself. Congratz on proving that an Evo is one of the best reliable sports in the world now (200,000+ obo).
YES you CAN run Kelford 272 on stock valvetrain!!! just dont rev too high with them like that...it is recommended that you upgrade valvetrain to take full advantage of these cams.
im about to put mine in next week and from what ive heard u should upgrade springs and retainers.. so i bought the manley spring and retainer kit.. for only 200 bucks i guess its worth the insurance on something going wrong
Evolving Member
Joined: May 2008
Posts: 144
Likes: 0
From: Pensacola, FL / Norfolk, VA
That and u will get the full use of the cams u paid for....they shine on the top end Ie. after 7000 RPM. When u wrap it out to 8500+ u will be glad u got the springs..I know i am happy knowing i can go up to 9000 RPM if i want to.
Edit: Plus i ran mine out to 8200 at the track on the stock head, none of this stoping at 7K stuff.
Edit: Plus i ran mine out to 8200 at the track on the stock head, none of this stoping at 7K stuff.
Kelford and Cosworth 272 with 11.00mm lift on intake and exhaust can be used with stock valvesprings. Conservatively not exceeding 7850rpms limit. They can float at 8100-8200.
We have built hundreds of engines both with or without them and never had a single piston to valve contact with either of those cams whether on stock or aftermarket springs.
We have built hundreds of engines both with or without them and never had a single piston to valve contact with either of those cams whether on stock or aftermarket springs.
Kelford and Cosworth 272 with 11.00mm lift on intake and exhaust can be used with stock valvesprings. Conservatively not exceeding 7850rpms limit. They can float at 8100-8200.
We have built hundreds of engines both with or without them and never had a single piston to valve contact with either of those cams whether on stock or aftermarket springs.
We have built hundreds of engines both with or without them and never had a single piston to valve contact with either of those cams whether on stock or aftermarket springs.
^^^^^^^^BAM!!!!!! thanks for the GOOD information.
Newbie
Joined: Jan 2010
Posts: 13
Likes: 0
From: Lake Tapps
It would only be wreckless if he was trying to run 9000rpms. I'm running kelford 272's and only reving to 7800. I was told by my tuner and the person that i bought them from that i will be safe as long as i stay below 8000rpms. If you are running it as a drag then yea i would replace the valvetrain. or if your going with the kelford 280s.... if your on 272s youll be ok dude.
Spring kit = Cheap insurance !
Wow. The only guy with first hand, empirical evidence is shot down by a bunch of speculators who do not even run Kelford 272's (per their signatures). Amazing how much disinformation can be spread on these forums.
Listen to the guy who actually has them in his car. Kelfords are fine on stock valve springs as long as you don't exceed the stock rev limit. End of story.
Now, if you want to run a built 2.0 or destroked 2.1 and rev it out to 9500 on a big turbo, then yes, you will need stiffer valve springs. Otherwise, there are a bunch of people on stock valve springs with Kelfords with no issues.
Listen to the guy who actually has them in his car. Kelfords are fine on stock valve springs as long as you don't exceed the stock rev limit. End of story.
Now, if you want to run a built 2.0 or destroked 2.1 and rev it out to 9500 on a big turbo, then yes, you will need stiffer valve springs. Otherwise, there are a bunch of people on stock valve springs with Kelfords with no issues.
I might not have them in my car, but it doesnt mean I havent tuned them, built motors or installed them. Its not a matter of valve contact from the valve float. Its decreased valve control over time, sagging (loss of pressure), and then ultimately broken valvesprings. Anything run to within 3-4% of the rpm a known valvefloat point is still doing damage whether its seen or not.
aaron
Last edited by JohnBradley; Mar 16, 2010 at 07:15 PM.
That's with any car at high RPM. I've had customers dual spring race cars that missed a shift...end result is engine gotta come apart.