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#1
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Hydraulic Roller Lifters-Lifter Bore
In regards to hydraulic roller lifters is it required to enlarge the oil passages in the lifter bore or are there dependable roller lifters designed to work without pulling a rotating assembly down to enlarge the oil holes?
For reference this is a combo street/road race application 468. Certainly not a race engine at under 600 hp but a hydraulic roller lifter will be stressed in this form of racing. Thanks for the help; If the only way the lifter will live is with more oil; I’ll rethink converting to a hydraulic roller. |
#2
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IMO a nitrated SFT cam is the most reliable street/strip set up for our Pontiacs. Since the Crane hydraulic rollers are NLA we have not found a reliable hydraulic roller lifter for a Pontiac. Just a bunch of expensive sad stories.
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The Following 2 Users Say Thank You to PAUL K For This Useful Post: | ||
#3
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#4
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Crower Coolface Solid Lifters
Crower Coolface solid lifters feature a small-diameter .024 in. metering port that is precision-machined in the face of the lifter. They will provide longer camshaft and lifter life with no loss of oil pressure. These lifters are designed to eliminate lobe and lifter wear caused by inadequate lubrication at the cam and lifter surface. With today's high-rpm, high rocker arm ratio and high spring pressures, cam and lifter failure is at an all-time high. .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#5
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Quote:
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The Following User Says Thank You to mgarblik For This Useful Post: | ||
#6
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Quote:
Eric
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"Everybody has a plan until they get punched in the mouth" noted philosopher Mike Tyson Life begins at the end of your comfort zone. “The mind, once stretched by a new idea, never returns to its original dimensions.” |
The Following User Says Thank You to Elarson For This Useful Post: | ||
#7
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Quote:
Is this done after the purchase of the cam? |
#8
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
#9
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No, normally the cam is rough ground, Nitrided then finished.
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The Following User Says Thank You to PAUL K For This Useful Post: | ||
#10
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Anyone cryoing cam and lifters?
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Skip Fix 1978 Trans Am original owner 10.99 @ 124 pump gas 455 E heads, NO Bird ever! 1981 Black SE Trans Am stockish 6X 400ci, turbo 301 on a stand 1965 GTO 4 barrel 3 speed project 2004 GTO Pulse Red stock motor computer tune 13.43@103.4 1964 Impala SS 409/470ci 600 HP stroker project 1979 Camaro IAII Edelbrock head 500" 695 HP 10.33@132 3595lbs |
The Following User Says Thank You to Skip Fix For This Useful Post: | ||
#11
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In regards to solid flat tappet cams and the Crower Coolface solid lifters, are we now at the point where once adjusted properly the solid lifters don't need to be checked for lash on a regular basis? If so, does this require some combination of a lifter brace or shaft style system? I understand the benefits power wise of a SFT cam but want a set and forget setup. Running a hydraulic cam and Rhodes lifters (although a bit noisy) was just that.
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#12
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Paul Carter will Cryo a camshaft for $145. In the past he has done valvesprings for me.
http://www.cartercryo.com/index.html .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
The Following User Says Thank You to Steve C. For This Useful Post: | ||
#13
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The lifter bore bracing is a roller lifter deal......
'Roller Pressure Angle' The direction of the applied force lifting a roller lifter is at an angle and not directly along the axis of the lifter. The more aggressive the profile, the greater the pressure angle. Beyond the limit at about 33 degrees, reliability drops dramatically. This side thrust distorts the lifter body and leads to hydraulic collapse. These side loads are not seen with a flat-tappet-style lifter hence the problem is not an issue. The bigger the roller and cam base circle, the less the roller side loading On a Pontiac application you will often see it touted that a lifter bore brace is typically not necessary until the duration at 0.200" valve lift approaches or is over 200 degrees duration. But even if their roller cams don't follow that guideline many go ahead and install them anyway as insurance Of interest.... years ago Jim Butler included a list of solid roller cams offered in his catalog (they were Comp Hi-Tech .420 rollers), and with that listing of cams he mentioned specific lobes that he stated "should not be aggressive enough to break lifter bores". Those lobes were from 252 at .050 (169 at .200) thru the top lobe with 282 at .050 (195 at .200). .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
The Following User Says Thank You to Steve C. For This Useful Post: | ||
#14
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Quote:
IMO if you do the same with a sft cam you will be fine. The Crower SS rockers have a larger bearing than any aluminum RR so they will last longer. You could buy a shaft system and be golden but expect to pay 1800+$. "Coolface" lifters ? Well, cars have been running fine without them forever, just need the right oil. Maybe the fancy Crower sft lifters in a road race/endurance deal is of some use. But IMO for a typical nice street engine, no. The spring pressures for a under 600 HP engine are no big deal. If you want the Coolface lifters its just a few more bucks. The only problem I have ever had is when I used new lifters on a used cam. |
The Following User Says Thank You to Dragncar For This Useful Post: | ||
#15
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#16
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Quote:
Stan
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Stan Weiss/World Wide Enterprises Offering Performance Software Since 1987 http://www.magneticlynx.com/carfor/carfor.htm David Vizard & Stan Weiss' IOP / Flow / Induction Optimization - Cam Selection Software http://www.magneticlynx.com/DV Download FREE 14 Trial IOP / Flow Software http://www.magneticlynx.com/DV/Flow_..._Day_Trial.php Pontiac Pump Gas List http://www.magneticlynx.com/carfor/pont_gas.htm Using PMD Block and Heads List http://www.magneticlynx.com/carfor/pont_pmd.htm |
#17
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Not sure about Camshafts and the correct order to Nitride them, Paul, BUT I HAVE HAD OVER 15 CRANKSHAFTS NITRIDED BY MOLDEX AFTER THEY WERE MACHINED. Joe (and Whitey when he was alive) said Nitriding was the last step. I believe them.
Never had a failure of the crank yet. Tom V.
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"Engineers do stuff for reasons" Tom Vaught Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward. |
#18
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"Always run enough seat pressure to control the valve action as it returns to the seat. Heavier valves require more seat pressure. Strong, lightweight valves require less seat pressure. When in doubt, run slightly more seat pressure . . . not less."
Crane Cams .
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'70 TA / 505 cid / same engine but revised ( previous best 10.63 at 127.05 ) Old information here: http://www.hotrod.com/articles/0712p...tiac-trans-am/ Sponsor of the world's fastest Pontiac powered Ford Fairmont (engine) 5.14 at 140 mph (1/8 mile) , true 10.5 tire, stock type suspension https://www.youtube.com/watch?v=qDoJnIP3HgE |
The Following User Says Thank You to Steve C. For This Useful Post: | ||
#19
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Quote:
Btw it took some convincing to get Crower to Nitride their cams. They also charged considerably more than the other two places. |
The Following User Says Thank You to PAUL K For This Useful Post: | ||
#20
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Tom, who do you use for this process?
I have been considering either Nitride or Cryo... Just for convo purposes, any benifit to having both processes performed besides cost? SPEED SAFE, NICK
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"The grass is not greener on the other side, its just fertilized with different $h!t" |
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