Re: Old fashioned Rev Kits
[Re: hemienvy]
#3212613
02/10/24 09:03 PM
02/10/24 09:03 PM
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Joined: Jan 2003
Posts: 7,495 Minnesota
Hemi_Joel
master
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master
Joined: Jan 2003
Posts: 7,495
Minnesota
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They seem like such a sensible idea. But engine builders always tell me they are unnecessary, so I've never tried them.
[img]http://i.imgur.com/boeexFms.jpg[/img]31 Plymouth Coupe, 392 Hemi, T56 magnum RS23J71 RS27J77 RP23J71 RO23J71 WM21J8A I don't regret the things I've done. I only regret the things I didn't do. "Wise men talk because they have something to say; fools because they have to say something. ~ Plato"
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Re: Old fashioned Rev Kits
[Re: hemienvy]
#3212658
02/11/24 12:30 AM
02/11/24 12:30 AM
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Joined: Jan 2003
Posts: 31,050 Oregon
AndyF
I Win
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I Win
Joined: Jan 2003
Posts: 31,050
Oregon
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Auxiliary "valve" springs in the lifter valley, really they are lifter springs.
If you use these, do you use less spring on the valve ? Not really. The valve spring controls the valve, and the rev kit keeps the lifter in contact with the lobe. Rev kits used to be standard on circle track engines but we see them less and less. We do have an engine going together now with a rev kit in it. They make sense to use but the correct lifters are hard to find. Isky used to make them for lots of different applications but a lot of those part numbers have been discontinued.
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Re: Old fashioned Rev Kits
[Re: hemienvy]
#3212715
02/11/24 10:49 AM
02/11/24 10:49 AM
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Joined: Jan 2003
Posts: 10,738 North Dakota
6PakBee
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 10,738
North Dakota
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My guess would be, no need to increase your RPM limit unless you also increased your cam to move the powerband up.
However, by keeping your same RPM limit, you could use less spring, which would tend to beat up parts less. I look to the 69 1/2 six pack engines as an example. Again, IIRC, the design rpm limit with the stock cam was about 5800 with the springs used. With the same cam timing events, the six pack engines have stiffer springs which raised the usable rpm limit to 6200.
"We live in a time when intelligent people are being silenced so that stupid people won't be offended".
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Re: Old fashioned Rev Kits
[Re: RobR]
#3213044
02/12/24 02:28 PM
02/12/24 02:28 PM
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Joined: Apr 2003
Posts: 3,521 Tulsa, Oklahoma
340Cuda
master
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master
Joined: Apr 2003
Posts: 3,521
Tulsa, Oklahoma
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Back in the M/P class days when 10000 to 12000 rpm was standard that was the only way to do it. Every M/P engine I ever saw had a rev-kit... Given the work Ben Strader and others had to do to get the "Spinal Tap" LS to run at 11,000 rpm I wonder if the Modified Production engines from back in the day had any real valve control at those RPMs.
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