04-02-2010, 05:55 PM | #1 |
Dazed and Confused
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Hyd roller cam with a solid lifter
I was talking with a buddy the other day about this and he says it will extend the RPM range doing this. He got this info from a machinist named Tommy in Birmingham. I could see doing this in a non roller block to keep from buying the conversion lifters but I'm skeptical of the perfprmance benefit.
Post up your opinion on this
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04-02-2010, 09:23 PM | #2 |
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I would agree...especially with the right hydraulic roller (ie: something fairly aggressive). The solid allows a bit more precise control of the valve actuation and events. Lash changes would allow a somewhat "tunable" cam too. Same advantages would apply, even if they're technically "hydraulic" lobes.
And Tommy Sadler is probably the gentleman. Been doing this stuff for a while so I would probably take his word for it. He builds engines too, not just a machinist.
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04-03-2010, 07:15 AM | #3 |
Dazed and Confused
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Tommy Sadler is his name, my oldtimers was kicking in.
The discussion was about agressive ramp rates on the hyd roller and using it in an older block. I wonder if there would be an oiling concern on a roller block due to the extra height of the lifter bore?
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04-03-2010, 08:47 PM | #4 |
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Sure oiling is of concern... the lifter still feeds the pushrod and rocker arms.
Have to make sure the lifter oiling passage intersects the oil passage in block. |
04-04-2010, 10:00 PM | #5 |
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Can be done as long as the cam is billet. There were some comp cams that got out that were not billet in the late 90s I believe. And they caused some dipping on the cam lobes. Which cause some serious issues that are hard to chase down if you don't know what the symptoms are. Lol.
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04-06-2010, 08:15 PM | #6 |
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this may sound stupid but what about hyd. lifters with a solid roller cam and solid roller valve springs.or hyd. cam and lifters with solid roller valve springs,just curious
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04-07-2010, 05:00 AM | #7 |
Dazed and Confused
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I don't think a hyd lifter will stand up to the pressure of a
spring for a solid roller shaft. That would eliminate the "cushion" provided in the lifter and lead to failure IMO
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Proud owner of 93 Cobra #1928 306ci Forged flat tops, Windsor Sr iron heads, FMS X-303 cam, OE Cobra upper and lower, 65mm tb, 70mm maf, 24lb injectors, BBK shorties, Summit H-pipe and Flo-bastards |
04-07-2010, 09:30 AM | #8 |
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correct.
Seen some high-rev hydraulic setups use springs that were over 200# on the seat, and that's starting to get into the solid realm...but the spring-rate and open pressure also plays a big factor. The lifters for these are usually heavily modified. |
04-07-2010, 03:48 PM | #9 |
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I remember seeing an article in MM&FF back years ago, about making a stock hydraulic roller lifter "Semi-solid", by taking them apart, and stacking washers inside of them. It was supposed to do the same thing.
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