| FAQ |
| Members List |
| Social Groups |
| Calendar |
| Search |
| Today's Posts |
|
#1
11-26-2019, 11:33 PM
|
|||
|
|||
Thoughts on engine analyzer dyno chart.
This is projected dyno . I know numbers can be off, but based on this chart, what can I expect for performance- like how it will respond, idle quality in a 467, 4.25 stroke. This is for a projected 9.8:1 cr unported heads and cam with ultradyne lobes H5/H15 on a 115 LSA, advance 7 or 8 degrees. 288/296 and 231/239 at .050
|
|
#2
11-27-2019, 01:45 AM
|
||||
|
||||
|
I think you are grossly overestimating the cfm of the heads.
__________________
'73 T/A (clone). Low budget stock headed 8.3:1 455, 222/242 116lsa .443/.435 cam. FAST Sportsman EFI, 315rwhp/385rwtq on 87 octane. 13.12 @103.2, 1.91 60'. '67 Firebird [sold], ; 11.27 @ 119.61, 7.167 @ 96.07, with UD 280/280 (108LSA/ 109 ICL)solid cam. [1.537, 7.233 @93.61, 11.46 @ 115.4 w/ old UD 288/296 108 hydraulic cam] Feb '05 HPP, home-ported "16" D-ports, dished pistons (pump gas only), 3.42 gears, 275/60 DR's, 750DP, T2, full exhaust My webpage http://lnlpd.com/home |
|
#3
11-27-2019, 07:16 AM
|
||||
|
||||
|
The math for cfm needs from hp numbers is as such below.
454 hp\8 = 56.75 hp per cylinder. 56.75 / .43= 131.97 which is air flow @ 10" test depression. To get the needed air flow at 28"test pressure X by 1.67 131.97 X 1.67= 220.3 cfm. Stock big valve iron D port heads flow no more then 208 cfm at best at a 28" depression , and this 208 cfm comes in way up at .650" lift! 208 cfm will make 54 hp per cylinder for a hp number of 432 hp, and this 432 hp is not going to happen on a street motor with under 11 to 1 compression !
__________________
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! Last edited by steve25; 11-27-2019 at 07:22 AM. |
|
#4
11-27-2019, 10:43 AM
|
|||
|
|||
|
__________________
'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
11-27-2019, 12:32 PM
|
||||
|
||||
|
I made 450 dyno hp with 220 cfm 96 d-ports. However the flow at lift was 210. 9.25-1 463, 240/246 hft. Made 532 ft lbs at 3300.
Propelled a 3720lb ventura to 11.98 @ 109.5. It ran that number through the exhaust with the air cleaner on. At the time it had Redneck converter that flashed to 3900. 60 ft was 1.61x. I later took the aircleaner off and it would run 12.0's consistently. Then I put in a jum hand converter but never ran it at the track. Last edited by ponjohn; 11-27-2019 at 12:38 PM. |
|
#6
11-27-2019, 01:55 PM
|
||||
|
||||
|
I can comment on the idle quality.
Once the carb and distributor are tuned properly, With a 231-239 @ .050 in a 467, and spread out on a LSA of 115, then installed 7 or 8 degrees advanced, It's going to idle nearly smooth with only a very slight hint of something going on, and likely produce 12-14 inches of vacuum if the compression ratio stays close to 10:1 Should be a very docile camshaft in an engine that size. As an example, here's a 239/243 @ .050 on a tighter 112 LSA and installed at 106.25 ICL, in a 9.98:1 compression 462 CI engine. Even this cam idles pretty docile with a very slight lope, and only drops 150 rpm in and out of gear, and is making 12 inches of vacuum. https://youtu.be/AOqwz3QlO5k |
|
#7
11-27-2019, 03:48 PM
|
|||
|
|||
|
I made a mistake in my post. Dyno simulation was actually ran with standard KRE heads and their advertised flow.
|
|
#8
11-27-2019, 03:56 PM
|
|||
|
|||
|
467
4.250 stroke unported KRE heads Performer RPM intake w/ Q-jet 231 degree hyd flat tappet cam 502 hp at 5300 http://www.pontiacstreetperformance....d455MikeG.html .
__________________
'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 |
| Reply |
|
|
The PY Online Forums is the largest online gathering of Pontiac enthusiasts anywhere in the world. Founded in 1991, it was also the first online forum for people to gather and talk about their Pontiacs. Since then, it has become the mecca of Pontiac technical data and knowledge that no other place can surpass.
Linear Mode
