Re: hydraulic roller camshaft with solid roller lifters
[Re: mxbeep]
#3041639
05/11/22 09:08 PM
05/11/22 09:08 PM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
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Typically the hydraulic profiles have a more aggressive ramp profile and will lift the valve faster from base to .020" faster than a solid. From all the detailed profiling on lobes that I have done, generally speaking the typical hydraulic profiles are more on par with the more aggressive solid profiles. With all that being said, you could run a solid providing you run the lash on the tight side. On an iron block and aluminum head, I would start about .012" intake and .014" exhaust. Setting the lash looser gets it into the aggressive part of the ramp and will lift the valve faster and will also seat it faster. Spring load requirements will also increase with a faster aggressive lobe. Having the Hydraulic lifter acting as kind of a shock absorber and lifting the valve sooner on the short slow ramp allows you to get away with running a little less spring.
Some of the hydraulic and solid profiles will easily cross over.
Believe it or not the end result should be a more responsive cam with less overlap and more torque.
This is of course very general information and if it were a comp cam with actual known lobe numbers it would be easier to narrow down the intensity level and what lash settings you can get away with.
AG.
Last edited by turbobitt; 05/11/22 09:10 PM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: hydraulic roller camshaft with solid roller lifters
[Re: turbobitt]
#3041654
05/11/22 10:00 PM
05/11/22 10:00 PM
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Joined: Jul 2005
Posts: 1,624 qc
mxbeep
OP
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OP
top fuel
Joined: Jul 2005
Posts: 1,624
qc
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Re: hydraulic roller camshaft with solid roller lifters
[Re: Cab_Burge]
#3041659
05/11/22 10:06 PM
05/11/22 10:06 PM
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Joined: Dec 2003
Posts: 3,957 West Coast, CA
Troy
master
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master
Joined: Dec 2003
Posts: 3,957
West Coast, CA
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My work just got a Comp Hyd roller lifter engine back from the engine builder and those lifters make a ton of noise on startup. I pulled the valve cover after a long drive, engine ran ok ( 408ci) and within seconds all the lifters had bled down. I’m sorry but I don’t like them at all. I’m finishing up a 498ci and I’m running a custom Bullet solid flat tappet cam. Bullet lifters are on big time back order. I’m going to try a set of the Howard’s lifters with the EDM hole on the face. We’ll see what happens.
....there is nothing like driving my 1968 Hemi Dart around town and having people looking at you like you're nuts!!
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Re: hydraulic roller camshaft with solid roller lifters
[Re: Troy]
#3041667
05/11/22 10:31 PM
05/11/22 10:31 PM
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Joined: Oct 2005
Posts: 8,872 Ontario, Canada
Stanton
Don't question me!
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Don't question me!
Joined: Oct 2005
Posts: 8,872
Ontario, Canada
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Do you know how many THOUSANDS - that's with an "S" at the end - of roller lifters have been installed in big block Mopars WITHOUT bushing the lifter bores ?!?!?
AND ... are you trying to tell me "Nick's Garage" doesn't have the tools or connections to have lifter bores bushed ?!?!
1260 Rue Tellier, Laval, QC H7C 2H1 450-936-8100
Last edited by Stanton; 05/11/22 10:36 PM.
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Re: hydraulic roller camshaft with solid roller lifters
[Re: mxbeep]
#3041761
05/12/22 11:22 AM
05/12/22 11:22 AM
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Joined: Aug 2005
Posts: 760 Southington Ct.
turbobitt
super stock
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super stock
Joined: Aug 2005
Posts: 760
Southington Ct.
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So this is guess, based on that cam card it could be a Howards cam grind, Lobe numbers BHR243400 and BHR247383. See page 10 in the below link. https://www.howardscams.com/sites/default/files/lobe%20list%20email%201-20-2014.pdf If so, looking at the intensity between .020" lift and ..050", the number difference is 27 degrees. As for comparing to a solid roller, common ranges of around 27-36 degrees with 28 being considered very aggressive and would be regarded as a higher maintenance solid roller requiring a lot of spring and would definitely run a premium style lifter if running a solid body lifter. My concerns would be axle and bearing degradation especially if the valve train is not kept in control. AG.
Last edited by turbobitt; 05/12/22 11:23 AM.
1970 Challenger w/572 Hemi street car and my pride and joy.
1986 T-Type with 272 Stage 2 Buick V6 engine - True 8 second street car. Just updated the engine and put down 928 HP @ 35# boost to the ground on chasis dyno.
1976 Cee Bee Avenger Jet Boat - 460 Ford powered.
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Re: hydraulic roller camshaft with solid roller lifters
[Re: turbobitt]
#3041764
05/12/22 11:33 AM
05/12/22 11:33 AM
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Joined: Jul 2005
Posts: 1,624 qc
mxbeep
OP
top fuel
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OP
top fuel
Joined: Jul 2005
Posts: 1,624
qc
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[quote=turbobitt]So this is guess, based on that cam card it could be a Howards cam grind, Lobe numbers BHR243400 and BHR247383. See page 10 in the below link. https://www.howardscams.com/sites/default/files/lobe%20list%20email%201-20-2014.pdf If so, looking at the intensity between .020" lift and ..050", the number difference is 27 degrees. As for comparing to a solid roller, common ranges of around 27-36 degrees with 28 being considered very aggressive and would be regarded as a higher maintenance solid roller requiring a lot of spring and would definitely run a premium style lifter if running a solid body lifter. My concerns would be axle and bearing degradation especially if the valve train is not kept in control. AG. [/quote thanks for the comparison and information, i never thought of comparing to the Howards camshafts, and yes it would be too much of a high maintenance if converted to solid, thanks for pointing it out.
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