Any one running kelford 272 on stock head
Newbie
Joined: Jan 2010
Posts: 13
Likes: 0
From: Lake Tapps
missed shift = high rpm's = valve float = $$$$$$$$$
never opt for cheap engine parts.... you drive a nice car spend the $ and do the build right.
buy a $500 civic hatch if you want to skimp on a budget build
never opt for cheap engine parts.... you drive a nice car spend the $ and do the build right.
buy a $500 civic hatch if you want to skimp on a budget build
Last edited by CIH EVO 9; Mar 16, 2010 at 07:16 PM.
Newbie
Joined: Jan 2010
Posts: 13
Likes: 0
From: Lake Tapps
I just installed kelford 272's on my stock valvetrain and my car blew up on the first start up. Ok maybe it didn't and runs fine. I am on the stock turbo and will be keeping it under the stock rev limit. I think if a guy w/ 200k on stock valvetrain and kelfords is doing ok I would think its fine.
I have cosi m2s and my retainers were hitting the valve seals with stock springs. 60k miles (cams have been in for 35k), stock turbo, stock rev limit (I don't go above 7k anyway), never tracked/dragged. I pretty much drive it like an accord.
I wish I would've taken pics before I got rid of them.
Take this how you wish.
I wish I would've taken pics before I got rid of them.
Take this how you wish.
i've been running my 272's on stock valvetrain for over a year now. I have the springs and retainers, just have never put them in. I am going to put them in very soon tho, but i dont rev past 7500rpms...
I already knew the answer to this, but I felt asking the guys that make the cam is usually the best route:
His reply?
Naturally this prompted another question:
From: Noah
Sent: Wednesday, 10 March 2010 2:35 p.m.
To: camshaft@kelford.co.nz
Subject: Kelford 272 Camshaft Questions
Hello,
I purchased a set of Kelford 272 camshafts for my 4G63 Evo IX street car and wanted to know if I need to upgrade my valve train?
Is it overkill to have dual springs and retainers when running a stock framed turbo?
In your R&D did you find that there is power to be had at the high RPM band?
My car has a stock bottom end, so I don't know how well it can handle high RPMs.
Thank you in advance.
Noah
Sent: Wednesday, 10 March 2010 2:35 p.m.
To: camshaft@kelford.co.nz
Subject: Kelford 272 Camshaft Questions
Hello,
I purchased a set of Kelford 272 camshafts for my 4G63 Evo IX street car and wanted to know if I need to upgrade my valve train?
Is it overkill to have dual springs and retainers when running a stock framed turbo?
In your R&D did you find that there is power to be had at the high RPM band?
My car has a stock bottom end, so I don't know how well it can handle high RPMs.
Thank you in advance.
Noah
Noah,
The stock spring has very limited valve train control because the cam is aggressive and needs more open pressure to control lofting etc.
People tend to ‘get away with using it’ to a certain extent but with boost and rpm increase combined with the more aggressive cam flank, it is asking for trouble.
We only recommend our beehive spring. NOT a dual spring.
Regards,
Kevin Ban
Managing Director
Kelford Cams & Camshaft Shop
PO Box 7505, Sydenham, Christchurch, New Zealand 8240
100 Mowbray Street, Waltham, Christchurch, New Zealand 8023
P: + 64 3 366 4514 F: + 64 3 366 4515
The stock spring has very limited valve train control because the cam is aggressive and needs more open pressure to control lofting etc.
People tend to ‘get away with using it’ to a certain extent but with boost and rpm increase combined with the more aggressive cam flank, it is asking for trouble.
We only recommend our beehive spring. NOT a dual spring.
Regards,
Kevin Ban
Managing Director
Kelford Cams & Camshaft Shop
PO Box 7505, Sydenham, Christchurch, New Zealand 8240
100 Mowbray Street, Waltham, Christchurch, New Zealand 8023
P: + 64 3 366 4514 F: + 64 3 366 4515
From: Noah
Sent: Friday, March 12, 2010 6:18 PM
To: camshaft@kelford.co.nz
Subject: Kelford 272 Camshaft Questions
Kevin,
Thank you for the reply!
Why NOT a dual spring?
Noah
Sent: Friday, March 12, 2010 6:18 PM
To: camshaft@kelford.co.nz
Subject: Kelford 272 Camshaft Questions
Kevin,
Thank you for the reply!
Why NOT a dual spring?
Noah
Noah,
The dual springs have a lower natural frequency, their own mass working against them.
The beehive chases terminal harmonics further away than a dual ever will.
The KVS63 spring has 73lb on the seat and 200lb at 11mm lift
In high boost applications we use a 2mm spring seat to lift these figures by 20lb
Regards,
Kevin Ban
Managing Director
Kelford Cams & Camshaft Shop
PO Box 7505, Sydenham, Christchurch, New Zealand 8240
100 Mowbray Street, Waltham, Christchurch, New Zealand 8023
P: + 64 3 366 4514 F: + 64 3 366 4515
The dual springs have a lower natural frequency, their own mass working against them.
The beehive chases terminal harmonics further away than a dual ever will.
The KVS63 spring has 73lb on the seat and 200lb at 11mm lift
In high boost applications we use a 2mm spring seat to lift these figures by 20lb
Regards,
Kevin Ban
Managing Director
Kelford Cams & Camshaft Shop
PO Box 7505, Sydenham, Christchurch, New Zealand 8240
100 Mowbray Street, Waltham, Christchurch, New Zealand 8023
P: + 64 3 366 4514 F: + 64 3 366 4515
I put kelford 272s on my car without springs and retianers before my now Fp red setup when it was a stock turbo car on bolt ons, and all the car did was break up. You should do it right the first time man just my 02. After that got the valves redone and went with the supertech dual springs and retainers and the car has ran perfect since
Jebus i'm not reading through more then the first page. It amazes me that people can be so cheap, i mean god damn 400$ to have some security in aftermarket springs come on.....Jebus
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Any to answer the OP I have 272's on beehive springs stock retainers and I'm running to 8k. I have a buddy who has the kelfords on stock valve train his tuner limited him to 7200RPM. So to all the naysayers yes it can be done