Rev kits?
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Burning Brakes
Joined: Feb 2004
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From: over the water Cali
Rev kits?
Can you or do you even need a Rev Kit on LS1/6 heads for 6500-7000 rpm range??? Hydrolic roller cam with supercharger running up to 11 lbs boost but will be pushed to 15-16lbs in future.
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
If you want to rev the motor high I would seriuosly think about a solid cam and you would only need the rev kit to protect the motor if you had a pushrod or rocker failure 
Last edited by MotorHead; Nov 22, 2004 at 11:00 PM.
Pro
Joined: Oct 2004
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From: Pipe Creek TX
I believe the original intent of the rev kits ,was to control the lifter weight effect on the valve spring.
I've used them before on engines when the best valve springs would only give 200 lbs. on the seat.
Now , with springs going 260lbs. on the seat and higher ; I don't require the rev kit to help control valve motion.
This really depends on your application.
I've used them before on engines when the best valve springs would only give 200 lbs. on the seat.
Now , with springs going 260lbs. on the seat and higher ; I don't require the rev kit to help control valve motion.
This really depends on your application.
Team Owner
Joined: Apr 1999
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From: Reno Nevada
2024 C3 of the Year Finalist- Modified
The most reliable source to talk to is the Vendors. I was going to use H-rollers on a project motor and after talking to Crane and Comp Cams I determined that 6300 - 6500 was really about the limit even with a rev kit. Anything above that your in valve float - mild or wild depending on you springs quality and age.
The beauty of a blower motor is you can build them to make lots of power without lots of rpm. I only use solid rollers.
The beauty of a blower motor is you can build them to make lots of power without lots of rpm. I only use solid rollers.
Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
Originally Posted by SG4206
I believe the original intent of the rev kits ,was to control the lifter weight effect on the valve spring.
I've used them before on engines when the best valve springs would only give 200 lbs. on the seat.
Now , with springs going 260lbs. on the seat and higher ; I don't require the rev kit to help control valve motion.
This really depends on your application.
I've used them before on engines when the best valve springs would only give 200 lbs. on the seat.
Now , with springs going 260lbs. on the seat and higher ; I don't require the rev kit to help control valve motion.
This really depends on your application.
"In some endurance and most oval track applications, it is necessary to use a Rev Kit for the lifter to precisely follow the profile of the cam. This safety measure ensures that in the event fo pushrod breakage or rocker arm failure, the lifter will not come out of the lifter bore. This could cause a loss of oil pressure and a subsequent engine failure. These Rev Kits come with all necessary springs and buttons. The angle of the spring pockets duplicate the lifter angle in the block. Spring mounts are notched to fit the block where necessary and should require no machine work."
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Race Director
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
The first line pertains to keeping the lifer on the lobe. I know that the roller can fly off the back side of the lobe at high RPM on a solid roller so they might help in that situation. :
"In some endurance and most oval track applications, it is necessary to use a Rev Kit for the lifter to precisely follow the profile of the cam."
I have no experience with rev kits and always thought they were dreamed up to help hydraulic cams in the higher RPM range. Methinks they did not work that well and they are selling them as more of a safety measure now since they probably already have a few dozen kits made
"In some endurance and most oval track applications, it is necessary to use a Rev Kit for the lifter to precisely follow the profile of the cam."
I have no experience with rev kits and always thought they were dreamed up to help hydraulic cams in the higher RPM range. Methinks they did not work that well and they are selling them as more of a safety measure now since they probably already have a few dozen kits made
Last edited by MotorHead; Nov 23, 2004 at 04:23 PM.
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From: The Top of Utah
Originally Posted by MotorHead
I have no experience with rev kits and always thought they were dreamed up to help hydraulic cams in the higher RPM range. Methinks they did not work that well and they are selling them as more of a safety measure now since they probably already have a few dozen kits made
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Racer
Joined: Jul 2001
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From: Los Gatos, CA
AFR sells them for hydro cams. They publish a test that proves in one case they see a benefit at slightly higher rpm - nothing conclusive. I think the theory is that you can keep the heavy hyro roller lifter controlled better against the lobe but still run the lighter valve spring pressure you need to keep from collapsing the internal assembly. Seems like if you are running into rpm limits best to go to a solid roller...
Team Owner
Joined: Sep 2003
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From: eville in
Originally Posted by CFI-EFI
I don't know why you couldn't use a rev kit on hydraulic lifters. You could reduce some of the plunger depressing valve spring pressure and gain the safety of retaining the lifter in the bore, in case of a valve train failure. *I* don't think they'll add much to the rev limit, however, due to the nature of the hydraulic lifter.
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2nd Gear
Joined: Nov 2004
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Rev kits are basically a racing application with wild profile roller camshafts and extreme RPM`s to keep the lifter following the cam profile and not beating the cam and lifters to death. Also a lot of extra junk stuffed under the intake that can come apart if not carefully watched. A perfect example or good reason for not using a roller cam on the street. 
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From: Who says "Nothing is impossible" ? I've been doing nothing for years.
For all the advantages of running a solid roller to take the intake off and inspect everything once or twice a year is a small price to pay. I actually found a small intake gasket leak I didn't know about when I inspected my lifters after 5000 miles. They were in perfect shape and looked brand new, if you are not will to keep an eye on the valve train of a solid roller then you should not be running one anyway, but that will take care of itself. For those who seem to dislike the solid roller on the street for what ever reason I say get used to it, it is here to stay
