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#1
02-23-2024, 04:26 PM
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Old vs New Edelbrock Heads
With regards to round port e-heads, does anyone have any race track or dyno data on the difference between the older style combustion chambers and the new fast burn style? Is it worth to have them converted to the new style?
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Tim Corcoran |
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#2
02-23-2024, 05:08 PM
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Heart Shape Combustion Chamber Dyno Test
https://www.sdperformance.com/newsStory.php?newsID=41 https://www.sdperformance.com/newsStory.php?newsID=38 .
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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 |
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#3
02-23-2024, 05:42 PM
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Chamber Chatter
No testing data here, but some might have interest in the Edelbrock development of their heart-shaped combustion chamber for the Pontiac cylinder head. https://www.motortrend.com/how-to/in...ead-edelbrock/ .
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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 |
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#4
02-23-2024, 05:57 PM
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Each chamber has its place.... You can go far wrong with the CNC chamber. In our few "back to back" tests we haven't noticed much difference other than tuning requirements.
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#5
02-23-2024, 06:43 PM
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In theory motors with high piston speed should benefit from a fast burn chambers, and of course high reving motors like above 6500.
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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! |
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#6
02-23-2024, 08:34 PM
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i think for boost the old style is better....when i had mine opened up from dave at sdperf i asked for the heart shape chambers but since i had told him it was for a blower motor he advised against the faat burn chambers
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#7
02-23-2024, 10:18 PM
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Quote:
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#8
02-24-2024, 09:36 AM
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The CNC chamber is more sensitive to cam timing, piston design and burn rate.... But it's a good chamber and glad we have a choice.
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#9
02-24-2024, 10:22 AM
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Who does the conversion of older chambers to the newer hear shaped? I asked SD (before the fire) about doing that to a set of my 72cc E heads and he said they dont offer the service anymore since edelbrock sells them that way now.
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#10
02-24-2024, 10:46 AM
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Is it not also an issue with the new HSC if you want higher flow numbers,(cfm's) you need the old Edelbrock heads?
__________________
68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#11
02-24-2024, 11:17 AM
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Quote:
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| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#12
02-24-2024, 11:33 AM
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Quote:
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| The Following User Says Thank You to PAUL K For This Useful Post: | ||
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#13
02-24-2024, 12:36 PM
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Thanks Paul. You got me thinking. I wonder what kind of timing the old chamber E- heads use. I thought the old chambers were using around 36-38* timing. With our 505 we were at 34* on the dyno. 91 octane. We ran C12 at the start to find our best timing.
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
| The Following User Says Thank You to chuckies76ta For This Useful Post: | ||
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#14
02-24-2024, 09:31 PM
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My old bathtub Eddy chambers work best at 39 degrees timing for best mph.
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1967 Firechicken, 499", Edl heads, 262/266@0.050" duration and 0.627"/0.643 lift SR cam, 3.90 gear, 28" tire, 3550#. 10.01@134.3 mph with a 1.45 60'. Still WAY under the rollbar rule. |
| The Following User Says Thank You to AG For This Useful Post: | ||
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#15
02-25-2024, 11:03 AM
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My two "old" chambers one likes 38 the other 40.
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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: | ||
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#16
02-26-2024, 10:12 PM
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Thanks for all the replies, it sounds like there is no reason to bother with changing anything. If I was class racing and chasing every last pony then I would say it would be worth it. For my mild bracket motor not worth it.
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Tim Corcoran |
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#17
02-28-2024, 09:47 AM
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Quote:
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Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74  2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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#18
02-28-2024, 09:49 AM
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Hi Darby: What heads are you running now? Or are you still running the KRE D-ports? Thanks
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68 Firebird. IA2 block, 505 cu in, E-head, Solid roller 3650 weight. Reid TH400 4:11 gear. 29" slick. Best so far 10.12@133 mph. 1.43 60 ft. 76 Trans am, TKX .81 o/d, 3.73 Moser rearend, 468 with KRE D-ports, Doug headers, 3" Exh. |
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#19
02-28-2024, 10:12 AM
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Not a lot maybe 4-5hp.
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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 |
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#20
02-28-2024, 10:22 AM
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Quote:
__________________
Darby 74 Grandville 2Dr 455 c.i 4550# 2011 1.60 60 ft,7.33@94.55-11.502@117.74 2017, 74 firebird -3600 lbs (all bests) 1.33 60 ft, 6.314@108.39 9.950@134.32 M/T 275/60 ET SS Drag Radial 2023,(Pontiac 505) 1.27 60 ft, 5.97@112.86, 9.48@139.31.... 275/60 Radial Pro's |
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