Hi.
Anyone know if pressed steel rockers and related posts etc for the 998 are different to the 1275? I have taken a set from a 998 cooper to fit onto a 940 head on a 970S motor, and they don't appear to line up with the valve stem correctly. Were pressed rockers ever used on a 940 head or do I need to get some forged S ones?
998 pressed rockers
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ian2988
- Basic 850
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998 pressed rockers
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Hipwell
- 1275 Cooper S
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Re: 998 pressed rockers
Yes the 1275 ones have a wider oval pad, and can be used on small bore but not the other way around.
See yours are welded, I was going to start a thread on how to weld the rockers and how much weld is needed and where. I did a set of 998 ones then decided to 'upgrade' to the 1275 ones as they have a slightly higher ratio.
See yours are welded, I was going to start a thread on how to weld the rockers and how much weld is needed and where. I did a set of 998 ones then decided to 'upgrade' to the 1275 ones as they have a slightly higher ratio.
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ian2988
- Basic 850
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- Joined: Sat Mar 21, 2015 4:23 pm
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Spider
- 1275 Cooper S
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Re: 998 pressed rockers
I know welding them has been a practice going back a long way, but I question if it really is necessary. I've run some high poundage springs with fast opening and closing cam profiles and never had an issue, but open to learn from other on this.Hipwell wrote: See yours are welded, I was going to start a thread on how to weld the rockers and how much weld is needed and where. I did a set of 998 ones then decided to 'upgrade' to the 1275 ones as they have a slightly higher ratio.
Of the factory Rockers, the Pressed types have always been my pick.