View Poll Results: What is a safe RPM for a stock bottom end with aftermarket springs?
6300 RPMs
38
8.46%
6400 RPMs
25
5.57%
6500 RPMs
89
19.82%
6600 RPMs
44
9.80%
6700 RPMs
45
10.02%
6800 RPMs
118
26.28%
6900 RPMs
29
6.46%
7000+ RPMs
61
13.59%
Voters: 449. You may not vote on this poll
Safe RPMs on a stock bottom end with springs
05-11-2007, 04:44 PM
#123
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Originally Posted by just1news6
welll if its mid year proly count mine out it was built in february
07-03-2007, 07:01 PM
#128
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From the SpinTron data I have... Stock Rockers, stock pushrods, Upgraded Springs (Beehives and Duals), Mild .600 lift Cam, stock heads and ET LS7 Heads.
Everything looks really good up to 7000 RPM, Starts going away at 7500 RPM, at 8000 RPM there is significant valve bounce and spring surge, at 9000 RPM the rockers spit all thier needle bearings and the tops of the guides broke off.
When I have some free time I want to put a combo together that has good valvetrain dynamics at 9000 RPM.
Everything looks really good up to 7000 RPM, Starts going away at 7500 RPM, at 8000 RPM there is significant valve bounce and spring surge, at 9000 RPM the rockers spit all thier needle bearings and the tops of the guides broke off.
When I have some free time I want to put a combo together that has good valvetrain dynamics at 9000 RPM.
07-05-2007, 12:38 PM
#132
97-00 I tend to think of 6,500 as the limit, I'm willing to push with the stock rod bolt. With after market rod bolts 7000.
My car is a 99 and I shift ~6,300. Rev limiter set at 6,800.
01 and up with the better rod bolt, 6800. With aftermarket bolts 7000.
My car is a 99 and I shift ~6,300. Rev limiter set at 6,800.
01 and up with the better rod bolt, 6800. With aftermarket bolts 7000.
07-10-2007, 02:46 PM
#133
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Originally Posted by Yeahdoug
From the SpinTron data I have... Stock Rockers, stock pushrods, Upgraded Springs (Beehives and Duals), Mild .600 lift Cam, stock heads and ET LS7 Heads.
Everything looks really good up to 7000 RPM, Starts going away at 7500 RPM, at 8000 RPM there is significant valve bounce and spring surge, at 9000 RPM the rockers spit all thier needle bearings and the tops of the guides broke off.
When I have some free time I want to put a combo together that has good valvetrain dynamics at 9000 RPM.
Everything looks really good up to 7000 RPM, Starts going away at 7500 RPM, at 8000 RPM there is significant valve bounce and spring surge, at 9000 RPM the rockers spit all thier needle bearings and the tops of the guides broke off.
When I have some free time I want to put a combo together that has good valvetrain dynamics at 9000 RPM.
Was this with stock lifters and rod bolts?
