AFR Hydra Rev Kit
Thread Starter
Melting Slicks
Joined: Feb 2008
Posts: 3,286
Likes: 6
From: Palm Beach
AFR Hydra Rev Kit
I was reading on the AFR site about the 195 Eliminators. They suggest the use of the Hydra Rev Kit if you are going to spin above 6000.
I had never heard of this kit.
Anyone have any experience with it?
I had never heard of this kit.
Anyone have any experience with it?
Safety Car
Joined: Apr 2005
Posts: 3,624
Likes: 431
From: Dale City VA
Rev Kits in general are used to keep the lifters in more precise contact with the cam lobes. They do this by using small springs which "pre load" the lifter. People have the mis-conception that the spring pressure will wear the roller brgs out faster in a roller lifter but in reality the oposite is true. Because the wheel tracks more accuratley on the lobe the lifters wheel dosen't skid on the cam lobe (espc bad on the closing side of aggressive lobes) and the lifters life is greatly extended.
It's not a free ride thou. Sice the lifters are pre loaded by spring pressure the added friction they create eats a little HP. How much depends on how much you make.
Ed Iskenderian was the biggest fan of rev kits that ever was. He stated his testing indicated that they increased the life of roller lifters by about 50%. Back in the 80's we always ran them on our oval track motors and we never had a lifter failure while others did. If I build a mech roller SBC or BBC for the street it gets a Rev Kit.
Will
Drifting
Joined: Mar 2008
Posts: 1,756
Likes: 0
From: Wichita KS
Rev kits have been around for many years. A rev kit consists of springs to keep the lifters in contact with the cam lobe. It's basically coil springs that fit between the lifter body and the underside of the cylinder head. Every manufacturer uses a slightly different design, springs and hardware. They all do the same thing. A side benefit of them is, if a pushrod comes off, it prevents the lifter from coming out and an instant loss of oil pressure.
Another question was asked about if the side plate is retained. Yes it must be. The side plate prevents the lifter from turning sideways. A rev kit takes the weight of the lifter off the valve train as it launches upwards.
Another question was asked about if the side plate is retained. Yes it must be. The side plate prevents the lifter from turning sideways. A rev kit takes the weight of the lifter off the valve train as it launches upwards.
Racer
Joined: Aug 2007
Posts: 252
Likes: 1
From: Ellicott City, MD
True but the AFR Hydra-Rev kit is unique since it places a (slight) force on the side of the lifter.
I'd still like to know more about its longevity.
I'm the type of guy who thinks iridium plugs are GREAT since you [theoretically] don't have to replace them as frequently as non- iridiums.
In the "less filling/ tastes great" debate on this forum I guess this makes me a "less filling" guy in a land "tastes great" crazies.
The less time spent under the hood the better.
I'd still like to know more about its longevity.
I'm the type of guy who thinks iridium plugs are GREAT since you [theoretically] don't have to replace them as frequently as non- iridiums.
In the "less filling/ tastes great" debate on this forum I guess this makes me a "less filling" guy in a land "tastes great" crazies.
The less time spent under the hood the better.
Last edited by 89FX3; Aug 31, 2008 at 09:11 AM.
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Melting Slicks
Joined: Jun 2000
Posts: 3,215
Likes: 6
From: Tampa Florida
I'm running one.
I have 20,000 miles on it (not all easy) with no issues.
I changed from a supposedly suitable dual spring package (CNC Cylinder Heads Stage III setup) to a set of CC 918 beehives and the AFR HydraRev kit when the dual spring package was getting a 6200 rpm peak and valve float there after.
Now I shift at 7000 rpm.
Cam is a GM847 (296/304, .575/.595).
Was it the beehives or the hydra rev...probably both or atleast one is backing up the other. Dyno time was too expensive to piecemeal the install.
I have 20,000 miles on it (not all easy) with no issues.
I changed from a supposedly suitable dual spring package (CNC Cylinder Heads Stage III setup) to a set of CC 918 beehives and the AFR HydraRev kit when the dual spring package was getting a 6200 rpm peak and valve float there after.
Now I shift at 7000 rpm.
Cam is a GM847 (296/304, .575/.595).
Was it the beehives or the hydra rev...probably both or atleast one is backing up the other. Dyno time was too expensive to piecemeal the install.
Burning Brakes
Joined: Jun 2000
Posts: 1,148
Likes: 48
