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#21
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....Impending rain I'd think makes for some "bad" air
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#22
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I don't have any modern tight lash cams to check, so I don't not how they compare.
My Engle was a 55 year old design and was 6.55 degrees difference The data I have from 45 years ago from helping someone else on a 302 Z28 stocker with a Lunati cam is 5.19 degrees difference. (Lash Called for 0.010" Intake and 0.012" Exhaust) 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 |
#23
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My RAIV headed 400 though with an UD 288/296 HP peak was 6100.
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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 |
#24
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For most solid cams Mike Jones uses a .012 ramp, resulting in less 'difference' between hyd and solid. Most Ultradyne solids used a .017 ramp.
Below two images labelled 'twelve' and 'seventeen' for different solid ramps, my 12 numbers are within 1 degree of Mike's, he likely used a different rod/stroke ratio. Mine are symmetrical lobes. Quote:
Last edited by pastry_chef; 09-09-2019 at 08:24 PM. |
#25
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hi tc you send me a private message regarding my 428 if i find i new cam...
sadly had no time to finish my 428 with th 60919 cam... what makes me wonder that you lost 5 mph changing to 60919 cam.. this is a lot...i think ...maybe there are unnown changes...compression lost ...carb change. ignition timing... |
#26
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1977 Black Trans Am 180 HP Auto, essentially base model T/A. I'm the original owner, purchased May 7, 1977. Shut it off Shut it off Buddy, I just shut your Prius down... |
#27
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Is there any value in 1 3/4" headers?
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#28
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I was wondering the same thing as I think 1 5/8" headers are counter productive above 4800 rpm.
The inlet to the header tube needs to be atleast 1/16" of a inch larger all the way around the perimeter of the Exh port flange!
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Wernher Von Braun warned before his retirement from NASA back in 1972, that the next world war would be against the ETs! And he was not talking about 1/8 or 1/4 mile ETs! 1) 1940s 100% silver 4 cup tea server set. Two dry rotted 14 x 10 Micky Thompson slicks. 1) un-mailed in gift coupon from a 1972 box of corn flakes. Two pairs of brown leather flip flops, never seen more then 2 mph. Education is what your left with once you forget things! |
#29
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Yeah, hit rain when I arrived at the track 1&1/2 hour drive. Sat for an hour, cleared up enough for two test runs, then started raining again. Hope to figure that out too. |
#30
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"My worn lobe SFT cam was 110 LSA. I'd like a better idle, so I thought I'd try 112 or 113. I was hoping I'd get some et's from others as this cam is talked about a lot."
"Rough" idle is simply a by-product of tight LSA. You either have to raise the compression ratio or wider LSA to offset the overlap, "reversion" and lost efficiency at idle speed, just the laws of physic with these things. Tuning plays a HUGE roll in idle quality when using pretty decent size tight LSA camshafts in these engines. They are going to want/like/need more timing at idle and more fuel to the mixture screws to make them happy. Recently had a 350 SBC build come in here that idled poorly but made great power off idle. The owner/builder had consulted with me on cam selection and I recommended the GM LT4 "Hot" cam for it, on a 112LSA. He called Comp and they sent their version of that cam to him on a 110LSA. He was using trick flow aluminum heads but only 9.7 to 1 compression so it didn't idle all that well, but made somewhere around 435hp and pretty stout torque numbers for a little 350 SBC build. I spent about half an hour with the carburetor increasing idle bypass air and putting more fuel to the mixture screws. Night and day difference in idle quality when we put the carb back in place. It tamed the cam pretty good and reduced the "stinky" exhaust from being a tad too lean.......Cliff
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
#31
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My point was go bigger than a RAIV type cam.
Crower lists the peak HP RPM as 4800 with the 919. The VooDoo HFT 705 is like one step up (241/249), and you could get it cut on a 112 if you wanted. But with your gears, you could get away with bigger. True your SCR may impact it some, but the recommendations are very 'centered' between iron and aluminum heads. .
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. 1970 GTO Judge Tribute Pro-Tour Project 535 IA2 http://forums.maxperformanceinc.com/...d.php?t=760624 1971 Trans Am 463, 315cfm E-head Sniper XFlow EFI, TKO600 extreme, 9", GW suspension, Baer brakes, pro tour car https://forums.maxperformanceinc.com...ght=procharger Theme Song: http://www.youtube.com/watch?v=7zKAS...ature=youtu.be |
#32
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A 4.250 stroke engine with 260 cfm heads, Performer RPM intake, large Q-jet and headers made peak power at 5300 rpm on the dyno with the 60919 cam. I would presume a shorter stroke would have a higher peak rpm.
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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 |
#33
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The OP here said 670 ported, curious who did the work and are the numbers up there also?
Would be nice if Crower was precise with their numbers, seems to be much confusion where their ADV rating is.. |
#34
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Way back in 2004 with my old 455 and Crower 60919 cam we made peak HP at 5600rpm's with the new (at that time) KRE heads.
4,400 539.4 451.9 4,500 537.4 460.4 4,600 534.9 468.5 4,700 532.5 476.5 4,800 523.5 478.5 4,900 518.9 484.1 5,000 511.4 486.9 5,100 501.6 487.1 5,200 492.7 487.8 5,300 485.4 489.8 5,400 478.1 491.6 5,500 471.9 494.2 5,600 463.6 494.3
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If you can read this, thank a teacher. If you can read this in English, thank a Veteran! https://cliffshighperformance.com/ 73 Ventura, SOLD 455, 3740lbs, 11.30's at 120mph, 1977 Pontiac Q-jet, HO intake, HEI, 10" converter, 3.42 gears, DOT's, 7.20's at 96mph and still WAY under the roll bar rule. Best ET to date 7.18 at 97MPH (1/8th mile), |
#35
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I wouldn't change the recipe, just the procedure and conditions your cooking with/in firstly.
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#36
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Driving around town, I felt that the car accelerated very well. I was impressed! This thread was because I was expecting some great 1/4 mile numbers. The night before I ran the 1/4 mile, (results in my first post ) I ran on a different track that is 1/8 mile. Even with slight tire spin the car ran 60 ft 1.656 1/8 et 7.731 Being a parent, I should have followed my own rule. If you don't expect anything, you won't be disappointed. Last edited by tc; 09-14-2019 at 10:13 AM. |
#37
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"Can some of you respond to the idea mentioned before that the HFT cam loses .030 lift because of the H lifters?"
Related: https://forums.maxperformanceinc.com...intron+testing .
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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 |
#38
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Post 24, per Mike Jones. He would have discovered long ago if there was a necessary hyd plunger compensation factor required.
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Last edited by pastry_chef; 09-14-2019 at 12:07 PM. |
#39
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"Some lift is lost due to deflection"
Deflection ? As in the one example of pushrod flex ? .
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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 |
#40
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Pushrod is one.
Others Rocker arm Deflection Rocker Stud Deflection Cam Core Diameter Quote:
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