Solid roller cam valve spring and lifter question
#2512449
06/24/18 03:42 AM
06/24/18 03:42 AM
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Pockets
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Friend installed a crane solid roller in his engine, Crane R-272/420-2-10 #688821 272/282@.050”, 304/314, .630/.630”, 110/105, .020”/.020” lash. He used Crower 66384 lifters which have a .750” wheel. Crane calls for their 66542 lifter which has an .815” wheel. Will this cause a loss of performance?
He also didn’t used the recommended Crane springs, he used Comp springs. They are 42 lbs light on open pressure. 99885 springs 215@1.95” 685@1.2” 618 lbs/in .610” lift 592 lbs
943-16 springs used 212@1.95” 626@1.2” 551 lbs/in .610” lift 548 lbs
His engine goes flat and loses power over 6000 rpm, stops pulling on the drag strip. Trick Flow 240 heads, trick flow single plane, quick fuel q950 carb. 493 RB striker, 11.9:1, 2” headers.
Would the light open pressure springs cause an issue? I told him to get the Crane springs, as 40lbs light on open pressure is a lot I thought.
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512465
06/24/18 07:59 AM
06/24/18 07:59 AM
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crabman173
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crabman173
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could be fuel issues as in running out--not enough volume etc
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512546
06/24/18 12:49 PM
06/24/18 12:49 PM
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Joined: Feb 2008
Posts: 715 Central TEXAS!!!!
sr4440
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the smaller wheel will cause a small loss of duration. what is the installed height? whats the lift at the valve? knowing this info will allow you to possible shim the valve spring and get some additional pressure.
also what do the plugs look like?
Joe
Without Data, you’re just another guy with an opinion.
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512584
06/24/18 01:45 PM
06/24/18 01:45 PM
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The fuel system was never an issue before, Magnafuel ProStar 500 pump, with -10 to the regulator, dual -6 feed. This is the car when a previous owner had it. Only the engine and trans is different. https://www.dragzine.com/news/hump-day-holeshot-70-sport-satellite-pulls-impressive-wheelies/He also ran a Q1050 carb on it, no change. RPM at the stripe is 6500, but he says it is dead after 6000. Cam is installed straight up. I am not sure about the max lift at the retainer, Harland Sharp 1.5 rockers. Install height is at 1.95" spec. Do you think shimming them to higher pressure, to bring the open pressure to what Crane suggests, will hurt anything given that the seat pressure will also go up? If he set them at 1.87" seat they would be 256 lbs, and at 1.26" (.610" lift) 592 lbs. (at what the Crane springs would be). The cam card also gives conflicting spring pressures. Says a 99885 spring, 215 lbs @ 1.95", and 565 @ 1.36". I can't say what the plugs look like, he never mentioned.
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512625
06/24/18 03:05 PM
06/24/18 03:05 PM
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Thumperdart
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Put a Dommy on that thing and wake it's azz up already and fwiw, my Solid roller Isky .680-.660 276-281 @ .050 had 210-580 for the first few years pulling past 7000 and ran 9's and low 6's............I went to 245-620 and saw no difference...........
Last edited by Thumperdart; 06/24/18 05:50 PM.
72 Dart 470 n/a BB stroker street car `THUMPER`...Check me out on FB Dominic Thumper for videos and lots of carb pics......760-900-3895.....
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512648
06/24/18 04:05 PM
06/24/18 04:05 PM
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Joined: Feb 2008
Posts: 715 Central TEXAS!!!!
sr4440
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super stock
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your not going to be able to shim it to make up the difference, you will pick up 5.1 lbs per .010.
again knowing what your total lift is at the valve will let you know how much you can shim them.
Joe
Without Data, you’re just another guy with an opinion.
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512746
06/24/18 09:02 PM
06/24/18 09:02 PM
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fast68plymouth
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I’d adjust the installed height to 1.880-1.900 as the first step.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512779
06/24/18 10:32 PM
06/24/18 10:32 PM
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Joined: Jan 2003
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fast68plymouth
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My SR headed 451RB made peak power at 7200 with a moderate .435 roller lobe, 1.5 rockers, and Isky 9375/85 springs that were about 250/550.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512821
06/24/18 11:57 PM
06/24/18 11:57 PM
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Joined: Aug 2003
Posts: 43,292 Bend,OR USA
Cab_Burge
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Friend installed a crane solid roller in his engine, Crane R-272/420-2-10 #688821 272/282@.050”, 304/314, .630/.630”, 110/105, .020”/.020” lash. He used Crower 66384 lifters which have a .750” wheel. Crane calls for their 66542 lifter which has an .815” wheel. Will this cause a loss of performance?
He also didn’t used the recommended Crane springs, he used Comp springs. They are 42 lbs light on open pressure. 99885 springs 215@1.95” 685@1.2” 618 lbs/in .610” lift 592 lbs
943-16 springs used 212@1.95” 626@1.2” 551 lbs/in .610” lift 548 lbs
His engine goes flat and loses power over 6000 rpm, stops pulling on the drag strip. Trick Flow 240 heads, trick flow single plane, quick fuel q950 carb. 493 RB striker, 11.9:1, 2” headers.
Would the light open pressure springs cause an issue? I told him to get the Crane springs, as 40lbs light on open pressure is a lot I thought. Why do people due this to themselves Buy and use parts that are not recommended for their application Why did he make the cam seem smaller to the motor using those small wheel rollers You reap what you sew Does the motor nose over at 6000 RPM in all gears or just at the finish line? All the BB solid roller cam motors I've built and used all revved well past 6000 RPM, even my old six pack 4.300 stroke 400 pump gas motor in the car at the track From 220 lbs. on the seats to 325 lbs. on the seats and from 620 Lbs. over the nose to 870 Lbs. over the nose Good luck, let us know what you find BTW, I do set all the springs up from .060 to .075 from coil bind on all the springs, no matter what the pressures
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512965
06/25/18 12:16 PM
06/25/18 12:16 PM
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fast68plymouth
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I guess we might need a better definition of “goes flat”.
I assumed you were saying the motor didn’t want to rev past 6k.
If the motor will pull 7k in like 2nd year, it’s unlikely the springs are your issue(or the lifters or lifter wheels).
That being said, it’s a cheap and easy test to decrease the spring installed height and see if the point where the motor goes flat changes at all.
I don’t know if the pushrods have been mentioned, but I’d want 3/8” .080 wall heat treated at a minimum.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Solid roller cam valve spring and lifter question
[Re: Pockets]
#2512997
06/25/18 01:12 PM
06/25/18 01:12 PM
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Joined: Jan 2003
Posts: 14,514 So. Burlington, Vt.
fast68plymouth
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.433 lobe with Hughes 1.6 rockers, Victor heads, PAC 1243 spring(same as comp 943), 1.900 installed height, peak power at 6800-7k.
Chip is running the same spring at 1.950 in his 572 hemi with .420 lobes, and when he’s spraying it, it turns about 7500 through the traps.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123 Dealer for Comp Cams/Indy Heads
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Re: Solid roller cam valve spring and lifter question
[Re: fast68plymouth]
#2513000
06/25/18 01:15 PM
06/25/18 01:15 PM
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Joined: Jan 2003
Posts: 13,385 Marion, South Carolina [><]
an8sec70cuda
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.433 lobe with Hughes 1.6 rockers, Victor heads, PAC 1243 spring(same as comp 943), 1.900 installed height, peak power at 6800-7k.
Chip is running the same spring at 1.950 in his 572 hemi with .420 lobes, and when he’s spraying it, it turns about 7500 through the traps.
CHIP '70 hemicuda, 575" Hemi, 727, Dana 60 '69 road runner, 440-6, 18 spline 4 speed, Dana 60 '71 Demon, 340, low gear 904, 8.75 '73 Chrysler New Yorker, 440, 727, 8.75 '90 Chevy 454SS Silverado, 476" BBC, TH400, 14 bolt '06 GMC 2500HD LBZ Duramax
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