Re: Valve Spring Seat Pressure -Break-In
[Re: bobs66440]
#1225715
05/02/12 12:52 AM
05/02/12 12:52 AM
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Joined: Aug 2003
Posts: 43,303 Bend,OR USA
Cab_Burge
I Win
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I Win
Joined: Aug 2003
Posts: 43,303
Bend,OR USA
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Quote:
I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.
Anyone have experience with this cam & spring combo during break-in? Opinions?
Thanks.
Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Valve Spring Seat Pressure -Break-In
[Re: Cab_Burge]
#1225716
05/02/12 10:12 AM
05/02/12 10:12 AM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Re: Valve Spring Seat Pressure -Break-In
[Re: MLR426]
#1225717
05/02/12 10:36 AM
05/02/12 10:36 AM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
OP
top fuel
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OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
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Quote:
Quote:
Quote:
I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.
Anyone have experience with this cam & spring combo during break-in? Opinions?
Thanks.
Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better
I assume you have a solid lifter cam..?? His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.
MLR426
It's a hydraulic lifter cam. I'm using Brad Penn 30wt break-in oil with a bottle of Comp Cams break-in oil additive.
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Re: Valve Spring Seat Pressure -Break-In
[Re: bobs66440]
#1225718
05/02/12 11:22 AM
05/02/12 11:22 AM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
ILL
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Quote:
Quote:
Quote:
Quote:
I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.
Anyone have experience with this cam & spring combo during break-in? Opinions?
Thanks.
Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better
I assume you have a solid lifter cam..?? His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.
MLR426
It's a hydraulic lifter cam. I'm using Brad Penn 30wt break-in oil with a bottle of Comp Cams break-in oil additive.
It should still be fine, closed load isn't the killer, it's open load pressures that kill. I would have like to see the open pressure under 300. Good oil is the a must especially after the break in.
MLR426
Last edited by MLR426; 05/02/12 11:24 AM.
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Re: Valve Spring Seat Pressure -Break-In
[Re: MLR426]
#1225719
05/02/12 11:41 AM
05/02/12 11:41 AM
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Joined: Mar 2010
Posts: 1,880 Out in Left Field, NY
bobs66440
OP
top fuel
|
OP
top fuel
Joined: Mar 2010
Posts: 1,880
Out in Left Field, NY
|
Quote:
Quote:
Quote:
Quote:
Quote:
I'm getting ready to break in my rebuilt 440 with a Summit 6401 .465 .488 /.282 .292 flat tappet cam and Stealth heads with 130lb closed seat pressure (330 lb @ .600) single spring with dampers. They, and Summit tech said that they will be fine for break-in, but I've been reading that 80-100lb would be better. I only want to do this once.
Anyone have experience with this cam & spring combo during break-in? Opinions?
Thanks.
Those pressures are fine, no sweat, great. I use pressures like that all the time on flat tappet solid and hydraulic cams In fact I try to shoot for a little more on both pressures, 150 to 175 on the seat and 325 to 375 opened, maybe a little more depending on the lobe lift and design of the lobe Your good with those pressures, make sure and prime the motor before starting and spin it over with the plugs out on the starter and then make sure it starts right away and run it at or above 2000 RPM for at least 20 minutes, thirty is better
I assume you have a solid lifter cam..?? His pressures are fine and the cam lift is in the post. As long as you break it in with 30 wt Brad Penn or equal oil your fine. Then change out oil to the wt oil of your choice as long as it has Zinc and phosphur.
MLR426
It's a hydraulic lifter cam. I'm using Brad Penn 30wt break-in oil with a bottle of Comp Cams break-in oil additive.
It should still be fine, closed load isn't the killer, it's open load pressures that kill. I would have like to see the open pressure under 300. Good oil is the a must especially after the break in.
MLR426
Thanks. I just got off the phone with Comp Cams tech and gave him the specs also. He estimated the spring pressure over the nose (.488 lift) at 285-290 lbs with those springs. He also said it will be ok. This is my first build and I'm just terrified of having to tear this thing back apart.
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Re: Valve Spring Seat Pressure -Break-In
[Re: bobs66440]
#1225722
05/04/12 04:00 PM
05/04/12 04:00 PM
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Joined: Aug 2005
Posts: 4,799 ILL
MLR426
master
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master
Joined: Aug 2005
Posts: 4,799
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Quote:
Thanks for your help!
Not a problem always here to help when I can.
MLR426
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