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Re: What does 75cc E-Street chamber look like?
[Re: CARMAN]
#1455692
06/27/13 11:10 PM
06/27/13 11:10 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
Here is a pic of the 75 cc chamber e heads that I just purchased.
What model of head is that (E-Street or Performer RPM) and is that CNC chamber work the way it comes OOB from Edelbrock?
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Re: What does 75cc E-Street chamber look like?
[Re: RAMM]
#1455694
06/28/13 11:12 AM
06/28/13 11:12 AM
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Joined: Jan 2008
Posts: 4,255
Canada
WO23Coronet
master
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master
Joined: Jan 2008
Posts: 4,255
Canada
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Quote:
Quote:
Here is a pic of the 75 cc chamber e heads that I just purchased.
Wow it looks like a decent turbo chamber but still looks sorely lacking for an NA engine-in the pressure recovery department. I could be wrong though as I am judging from a picture. I hope mine are more promising when I get them. J.Rob
What's pressure recovery, and what does the chamber have to do with it? And btw it looks like the RPM's are NHRA legal for stock/super stock (I think that's what BradH was referring to)
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Re: What does 75cc E-Street chamber look like?
[Re: WO23Coronet]
#1455695
06/28/13 12:24 PM
06/28/13 12:24 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
What's pressure recovery, and what does the chamber have to do with it?
I'm interested in this, too. I know what pressure recovery is, but am not clear on how the chamber design impacts this.
Quote:
And btw it looks like the RPM's are NHRA legal for stock/super stock (I think that's what BradH was referring to)
Actually, no. I think the NHRA-legal castings have been out for a while now, but since I don't follow the Stock / Super Stock stuff very closely, don't know anything about them.
I was referring to other things, such as the new 75 cc Performer RPM option and the spec on the revised Victor chamber being 72 cc, instead of the original 75 cc.
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Re: What does 75cc E-Street chamber look like?
[Re: dOOc]
#1455698
06/28/13 04:00 PM
06/28/13 04:00 PM
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Joined: Jul 2009
Posts: 494
IL
EchoSixMike
mopar
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mopar
Joined: Jul 2009
Posts: 494
IL
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Quote:
I like the 75 number but ....only to 5500 rpms ..... 
Well, with stock port volume, 5500 is quite realistic. You want to start winding it out, get some porting or go to Victors, Indy or B-1s  S/F.....Ken M
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Re: What does 75cc E-Street chamber look like?
[Re: EchoSixMike]
#1455699
06/28/13 04:29 PM
06/28/13 04:29 PM
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Joined: Jul 2008
Posts: 30,460
Florida STAYcation
dOOc
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,460
Florida STAYcation
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Quote:
Quote:
I like the 75 number but ....only to 5500 rpms .....
Well, with stock port volume, 5500 is quite realistic. You want to start winding it out, get some porting or go to Victors, Indy or B-1s S/F.....Ken M
I have never actually run a set of Eddy heads ...or even 440S pieces ... so OOTB they all have a TOP flow rate of 5500 rpm?
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Re: What does 75cc E-Street chamber look like?
[Re: dOOc]
#1455700
06/28/13 04:52 PM
06/28/13 04:52 PM
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Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
BradH
Taking time off to work on my car
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Taking time off to work on my car
Joined: Jan 2003
Posts: 15,439
Val-haul-ass... eventually
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Quote:
... OOTB they all have a TOP flow rate of 5500 rpm?
Limited by valve train components (i.e., soft springs for mild hydraulic cams), not by port volume or flow.
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Re: What does 75cc E-Street chamber look like?
[Re: BradH]
#1455701
06/28/13 04:58 PM
06/28/13 04:58 PM
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Joined: Jul 2008
Posts: 30,460
Florida STAYcation
dOOc
The village idiot's idiot
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The village idiot's idiot
Joined: Jul 2008
Posts: 30,460
Florida STAYcation
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Quote:
Quote:
... OOTB they all have a TOP flow rate of 5500 rpm?
Limited by valve train components (i.e., soft springs for mild hydraulic cams), not by port volume or flow.
So BH ..... so a box-stock set of 75cc heads ... with a good set of springs using a 557 or 590 solid-lifter cam....with a 480 inch moder ... 6200 hUn ?
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Re: What does 75cc E-Street chamber look like?
[Re: CARMAN]
#1455702
07/02/13 08:17 PM
07/02/13 08:17 PM
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Joined: Jul 2005
Posts: 636
Graz, Austria
DGS
mopar
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mopar
Joined: Jul 2005
Posts: 636
Graz, Austria
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Quote:
Here is a pic of the 75 cc chamber e heads that I just purchased.
Did Edelbrock change the casting? In some other older posts people said that the chamber was identical to the RPM. Well, the whole head was said to be identical except the chamber size of 75cc.
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Re: What does 75cc E-Street chamber look like?
[Re: EchoSixMike]
#1455704
07/08/13 10:55 PM
07/08/13 10:55 PM
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Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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looks like some pics have already made their way onto the thread.
here's a couple more:
chamber, no valves.
in these pics i have already re-cut the valve seats, so you are not looking at the as-supplied Edelbrock valve job.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: What does 75cc E-Street chamber look like?
[Re: fast68plymouth]
#1455705
07/08/13 11:05 PM
07/08/13 11:05 PM
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Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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you can see by this pic the valve seats are noticably recessed into the chamber roof.
you can also see they have lowered the roof some between the valves. this is evident because they needed to put a little trough coming off the spark plug hole.
on the 84cc head, the plug hole is clear of the roof.
also, as for these heads being "milled" to get the 75cc's.....while they didnt just mill an 84cc head down to remove 9cc's, they have done some machining of the casting in a way to help make the chambers smaller.
there is a "D" shaped pad on the deck of an 84cc head, along the intake side of the head, mid-way from front to back.
this pad is about .030 deep on the 84cc head.
on the 75cc E street head, its basically gone.
however....the head bolt boss thickness is the same as an 84cc head.....not .030 thinner.
also, you dont lose .030 of valve drop....its more like .015.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Re: What does 75cc E-Street chamber look like?
[Re: fast68plymouth]
#1455706
07/08/13 11:08 PM
07/08/13 11:08 PM
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Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
fast68plymouth
I Live Here
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I Live Here
Joined: Jan 2003
Posts: 14,506
So. Burlington, Vt.
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84cc RPM head with a Fel-Pro 1009 gasket.
notice how the chamber really follows the contours of the gasket adjacent to the intake valve.
68 Satellite, 383 with stock 906’s, 3550lbs, 11.18@123
Dealer for Comp Cams/Indy Heads
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Anyone have any flow numbers to compare to the RPM?
