Re: How many miles a year on your roller cam motor?
[Re: Hot 340]
#1652205
07/29/14 02:06 AM
07/29/14 02:06 AM
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Joined: Jan 2008
Posts: 795
Glendale Az
Darryls-Demon
super stock
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super stock
Joined: Jan 2008
Posts: 795
Glendale Az
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9500 miles in two years. includes two Hot Rod Drag Weeks, round trip from Phx. to Vegas, many trips to work and back and just driving around on weekends.
Still going strong. Solid roller, 200 on the seat, 500 open.
Also over 60 1/4 mile passes.
Last edited by Darryls-Demon; 07/29/14 02:09 AM.
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Re: How many miles a year on your roller cam motor?
[Re: Monte_Smith]
#1652208
07/29/14 03:43 AM
07/29/14 03:43 AM
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Joined: Aug 2006
Posts: 2,141
junction city oregon
viperblue72
top fuel
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top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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Quote:
Lift, duration and even spring pressure is NOT what kills cams on the street. It is how aggressive the lobe is. IE, how fast it opens and closes the valve. A VERY aggressive ramp speed on a lobe will murder a valvetrain in short order on the street. Keep the lifter ON the cam and you will be fine. Ultra fast "closing ramps" where the cam basically falls out from under the lifter will munch parts.
Monte
But that is directly related to spring pressures. There is also valve seats and guides and lifters to worry about. And spring pressure will have an effect.
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Re: How many miles a year on your roller cam motor?
[Re: viperblue72]
#1652209
07/29/14 04:13 AM
07/29/14 04:13 AM
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Joined: Nov 2004
Posts: 6,890
North Alabama
Monte_Smith
master
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master
Joined: Nov 2004
Posts: 6,890
North Alabama
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Quote:
Quote:
Lift, duration and even spring pressure is NOT what kills cams on the street. It is how aggressive the lobe is. IE, how fast it opens and closes the valve. A VERY aggressive ramp speed on a lobe will murder a valvetrain in short order on the street. Keep the lifter ON the cam and you will be fine. Ultra fast "closing ramps" where the cam basically falls out from under the lifter will munch parts.
Monte
But that is directly related to spring pressures. There is also valve seats and guides and lifters to worry about. And spring pressure will have an effect.
I can have two cams, with the same lift and duration and also the same seat and over the top pressure.....lets say 300 and 800. With lobe profiles I can make one ultra reliable and the other beat valvetrain parts out as fast as you can change them.
I design some BIG stuff for several Drag Week cars. Lifts approaching 1" and seat pressures of 375. They survive Drag Week just fine. Its all about the ramps
Monte
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Re: How many miles a year on your roller cam motor?
[Re: quickd100]
#1652211
07/29/14 09:54 AM
07/29/14 09:54 AM
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Joined: Jan 2003
Posts: 8,022
Tulsa OK
Bad340fish
master
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master
Joined: Jan 2003
Posts: 8,022
Tulsa OK
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I am by far no valve train expert but if you see some spintron data its pretty crazy what everything goes through. From Loft from the pushrod flexing to bounce on the return its pretty nuts. I don't have all my cam specs so I can't tell you how aggresivve the lobe is right now. I have a solid roller 258@.050 and .650 lift with 1.6 rockers on a small block. I don't drive it as much as I like but I put about 5000 miles on my last set of lifters before I pulled them. I am going to send them to comp to be checked out I just haven't gotten around to it. I also change my springs every year before drag week, I haven't tested them or anything I just change them. It makes me feel better when I am buzzing down the highway at 3500RPM for hours at a time. One thing I have seen on my cam is evidence of bounce on the closing side. You can't feel it with your finger but its there in the shiny markings if you hold the cam in the right light. I noticed that after my first teardown after dragweek in 2012. I just had the top end off of the motor to put new lifters in and I couldn't see those marks anymore but the cam was still in the motor. The only thing I did change was the lash. I went from running it off the mopar sticker to ICEO or whatever the order is(I have to look everytime LOL) same lash settings but different way of running the valves and the valvetrain sounds way better. Using the same lash with the mopar method my car sounded like a duramax after a few hours on the highway, the other method it sounds "normal" especially considering the lash has to grow a good amount with several hours of heat soak in all the parts.
68 Barracuda Formula S 340
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Re: How many miles a year on your roller cam motor?
[Re: Darryls-Demon]
#1652212
07/29/14 07:15 PM
07/29/14 07:15 PM
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Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
OP
master
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OP
master
Joined: Dec 2006
Posts: 3,395
Pa
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Quote:
9500 miles in two years. includes two Hot Rod Drag Weeks, round trip from Phx. to Vegas, many trips to work and back and just driving around on weekends.
Still going strong. Solid roller, 200 on the seat, 500 open.
Also over 60 1/4 mile passes.
Darryl, what are your cam specs?
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Re: How many miles a year on your roller cam motor?
[Re: Monte_Smith]
#1652213
07/29/14 07:19 PM
07/29/14 07:19 PM
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Joined: Dec 2006
Posts: 3,395
Pa
Hot 340
OP
master
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OP
master
Joined: Dec 2006
Posts: 3,395
Pa
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Quote:
Quote:
Quote:
Lift, duration and even spring pressure is NOT what kills cams on the street. It is how aggressive the lobe is. IE, how fast it opens and closes the valve. A VERY aggressive ramp speed on a lobe will murder a valvetrain in short order on the street. Keep the lifter ON the cam and you will be fine. Ultra fast "closing ramps" where the cam basically falls out from under the lifter will munch parts.
Monte
But that is directly related to spring pressures. There is also valve seats and guides and lifters to worry about. And spring pressure will have an effect.
I can have two cams, with the same lift and duration and also the same seat and over the top pressure.....lets say 300 and 800. With lobe profiles I can make one ultra reliable and the other beat valvetrain parts out as fast as you can change them.
I design some BIG stuff for several Drag Week cars. Lifts approaching 1" and seat pressures of 375. They survive Drag Week just fine. Its all about the ramps
Monte
So the big question has been for me, and ive asked this on Yellowbullet with no sucess, is, how do you see or judge an agressive lobe by looking at cam specs? I know its easy to just ask a lobe designer, but I want to know myself.
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Re: How many miles a year on your roller cam motor?
[Re: Hot 340]
#1652214
07/29/14 11:02 PM
07/29/14 11:02 PM
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Joined: Jan 2008
Posts: 795
Glendale Az
Darryls-Demon
super stock
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super stock
Joined: Jan 2008
Posts: 795
Glendale Az
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Quote:
Quote:
9500 miles in two years. includes two Hot Rod Drag Weeks, round trip from Phx. to Vegas, many trips to work and back and just driving around on weekends.
Still going strong. Solid roller, 200 on the seat, 500 open.
Also over 60 1/4 mile passes.
Darryl, what are your cam specs?
.254-.260@.050 .699-.703 lift
Lifters where checked at 5000 miles, they looked new. I do run a very tight lash .010 Intake .011 exhaust
Valve springs have never been changed.
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Re: How many miles a year on your roller cam motor?
[Re: Hot 340]
#1652217
07/30/14 12:17 PM
07/30/14 12:17 PM
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Joined: Aug 2011
Posts: 46
Finland
LUMI
member
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member
Joined: Aug 2011
Posts: 46
Finland
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110 gallons this year with new street engine, less than 400 miles from new 328/320deg 288/280 on 0.50 0.70int 0.76ex lift 210 lbs close 620 open seems to be too much for B1 Originals  
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