280 degree cam, is it ok for a stock bottom end.
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280 degree cam, is it ok for a stock bottom end.
I have searched and read a couple different threads and haven't really come to a solid conclusion.
I am about to have some Kelford 280 cams installed along with BC springs. I have read that the lift and duration on the 280 is too much for a stock bottom end. Causing valve to piston contact resulting in bent valves.
How much lift can you have with a stock block? Do you have to resort to a different piston, one with larger valve reliefs?
Thanks in advance.
I am about to have some Kelford 280 cams installed along with BC springs. I have read that the lift and duration on the 280 is too much for a stock bottom end. Causing valve to piston contact resulting in bent valves.
How much lift can you have with a stock block? Do you have to resort to a different piston, one with larger valve reliefs?
Thanks in advance.
Last edited by BrokenWatch; Dec 30, 2010 at 09:03 PM.
General rule of thumb, on a stock bottom end, I wouldn't go any further then 272's on a stock bottom end. Build the block and then you can go 280's, as for max lift, check out the moding for dummies thread.
OMG-- what a bunch of BS-- yes you can use the 280 cams, thats a lot of cam for a stock engine and will push the power band out of the range of a stock turbo so not a good combination. Yes, the bottom end will hold together for now. Cam duration and lift have absolutly no effect on the bottom end or the engine staying together-- how heavy your foot is and the rpms you are turning have everything to do with that. Get stupid and anything will come apart--even a " built" bottom end.
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Joined: Dec 2010
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You all have misunderstood what I am asking, rather I probably should have worded it differently but I figured I did it easy enough.
What I was asking was can you run a 280 degree cam, the lift is 11.5mm (per Kelfords website).
What I am concerned about is will the valve hit the piston with these cams? I know the stock piston has a small valve relief in them but is it deep enough for the additional lift? The clearance is what I am concerned about.
As far as my build check my garage.
What I was asking was can you run a 280 degree cam, the lift is 11.5mm (per Kelfords website).
What I am concerned about is will the valve hit the piston with these cams? I know the stock piston has a small valve relief in them but is it deep enough for the additional lift? The clearance is what I am concerned about.
As far as my build check my garage.
Description: My toy, track and autocross.
Engine/Drivetrain Modifications: Bolt Ons, APEXi WSII catback, AEM EMS, Full Race Prostock kit,
Suspension Modifications: TEIN Type N1 Dampers, Carbing bars.
Wheels/Tires Modifications: Yokohama Advan RS-D wrapped in Neova rubber: Street
SSR Type C wrapped in Toyo R888 rubber: Track
Interior/Exterior Modifications: Takata and BRIDE Gradiation.
Future Modifications: Not much more, just track time, more extensive tuning to dial in all the components.
Engine/Drivetrain Modifications: Bolt Ons, APEXi WSII catback, AEM EMS, Full Race Prostock kit,
Suspension Modifications: TEIN Type N1 Dampers, Carbing bars.
Wheels/Tires Modifications: Yokohama Advan RS-D wrapped in Neova rubber: Street
SSR Type C wrapped in Toyo R888 rubber: Track
Interior/Exterior Modifications: Takata and BRIDE Gradiation.
Future Modifications: Not much more, just track time, more extensive tuning to dial in all the components.
You all have misunderstood what I am asking, rather I probably should have worded it differently but I figured I did it easy enough.
What I was asking was can you run a 280 degree cam, the lift is 11.5mm (per Kelfords website).
What I am concerned about is will the valve hit the piston with these cams? I know the stock piston has a small valve relief in them but is it deep enough for the additional lift? The clearance is what I am concerned about.
As far as my build check my garage.
What I was asking was can you run a 280 degree cam, the lift is 11.5mm (per Kelfords website).
What I am concerned about is will the valve hit the piston with these cams? I know the stock piston has a small valve relief in them but is it deep enough for the additional lift? The clearance is what I am concerned about.
As far as my build check my garage.
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You are using the AEM EMS, so tuning the Cams will not be a problem.
But they are big Cams, Man.
May be you should try their 272's with your set-up. They are awesome and not as agressive.
You can always go bigger later as you out grow them.
But they are big Cams, Man.
May be you should try their 272's with your set-up. They are awesome and not as agressive.
You can always go bigger later as you out grow them.
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Joined: Dec 2010
Posts: 6
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From: On the sand.
Going to give Kelford a call to find out.
go with them
Even if the Cams fit and there is no issues with clearances and what not, there are other factors to should take into account.
I was giving you one of those other factors.
Go with the 11.5 lift Cams. You will see.
