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Posted: 10/08/08 05:01 PM
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Which is better? What are the deciding factors? I don't mind spending money so I'm not looking for cheap. I just need some info on what to choose. Please, anyone give me some advice or point me to a place where I can read about it. Its hard to try to understand something when the answers are extremely short or just give a brand name. I'm not trying to be rude if I came off that way. Thanks for any help.
'73 Dodge Challenger Rallye, 340 (Just found, first project)
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drmopar
Enthusiast
| Posts: 456
| Joined: 02/08
Posted: 10/08/08 06:29 PM
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Solid makes more power period. How? Simple more area under the curve, which creates a quicker lift for more power, its that simple. e.g. both cams have the same lift, both cams have the same duration, a solid cam creates a quicker amount of lift due to the quicker ratio built into the cam. Down side? occassional adjustments of the rockers are needed.
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fishy68
New User
| Posts: 19
| Joined: 11/07
Posted: 10/08/08 08:43 PM
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The doc nailed it. I've always liked solid cams better and now that they have the tight lash versions you don't even need to adjust them hardly ever.
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Posted: 10/08/08 10:45 PM
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Solid over hydr-o-lic, in anything other than stock, and anytime rules allow. I say run a solid always, roller or flat tappet.
age is no lock on brillance
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Posted: 10/09/08 02:17 AM
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The deciding factor is how much maintenance you are willing to do and how serious you are about wringing the most performance out of your combo. What do you forsee the ratio of street to strip use to be? There are some great fast rate of lift hyd. cams out there for your engine which will not give away too much to a solid in the lower rpm ranges up to 6000 rpm or so and you have the benefit of no lash adjustments after the initial build. (You should use adj. rockers with any serious hyd. stick w/ .020-.040 plunger pre-load.) But once you get up around 6500 rpm or more the ability of the hydraulic mechanism of the lifters to control the inertia of the valvetrain begins to become compromised. At some point-depending on the individual combination, the inertial forces of the valvetrain acting upon the oil pressure supported plunger will overcome the hydraulic mechanisms ability to accurately follow the cam and prevent uncontrolled valve motion. Many hyd. designs can pull cleanly to 6500-6800 rpm with well-matched components. This should be plenty with the torque your stroker should put out. BUT-if you are serious about high rpm performance with a good combo to back it up-a well-chosen solid will outperform the hyd. Especially in the upper rpm range where the solids ability to reliably control valve motion is far superior. Plus if you don't drive it all the time the lash adjustments will be few and far between.
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Posted: 10/09/08 02:44 PM
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Thanks guys. I don't plan on driving it around town too much. I already have a car and a pickup. I think it will prolly be about half and half between street and strip. I don't mind having to adjust the rockers every now and then.
'73 Dodge Challenger Rallye, 340 (Just found, first project)
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AdamR
User
| Posts: 73
| Joined: 09/08
Posted: 10/10/08 04:41 AM
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Hyd cams are for mini vans. Solids will pull higher vacuum, make more torque and pull higher.
age is no excuse for ignorance
www.forabodiesonly.com www.forbbodiesonly.com
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