CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
August 22, 2014, 06:39:36 PM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
103356 Posts in 12157 Topics by 4693 Members
Latest Member: MrMacleod
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Model Specific Discussions
| |-+  Trans-Am Camaros
| | |-+  Cowl plenum air cleaner, cold air induction, etc
« previous next »
Pages: 1 [2] 3  All Print
Author Topic: Cowl plenum air cleaner, cold air induction, etc  (Read 7094 times)
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #15 on: September 24, 2012, 12:02:35 AM »

I had Jim Webb check the cowl plenum duct screws in his red '67 rally sport Z-28. His screws look pretty
much the same as Paul Lasiter's although Paul's have four tiny bumps in a line across the head of the screw
and it looks as though Jim's might only have two bumps. There are no other markings on the screws.



Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #16 on: June 16, 2013, 12:36:35 AM »

The diameter of an original, authentic cowl plenum air cleaner lid is 16.75".
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #17 on: June 16, 2013, 12:39:11 AM »

The cowl plenum air cleaner base is 16" across, from the outer edge of the top lip on one side to the same point on the other side.
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #18 on: June 16, 2013, 12:40:23 AM »

Here's a look at the underside of the correct lid.
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #19 on: June 16, 2013, 12:44:44 AM »

Here's a closer look at the groove that the top lip of the air cleaner base rides in. There is a very similar
looking lid that you will see at swap meets that is close to the same size (around 17" dia) that has rubber
in the groove. Don't be fooled into buying it. It won't fit on an original GM cowl plenum air cleaner base.
Logged

Jon Mello
CRG
motorman
Member
***
Posts: 94



View Profile Email
« Reply #20 on: June 29, 2013, 07:16:26 PM »

this type air cleaner was originally supplied for the Z-11 impala drag cars.
Logged

new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08.
motorman
Member
***
Posts: 94



View Profile Email
« Reply #21 on: June 30, 2013, 07:27:01 AM »

this type air cleaner was originally supplied for the Z-11 impala drag cars.
also was used on the 63 NASCAR impalas with the "mystery" engine at daytona
Logged

new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08.
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #22 on: June 30, 2013, 05:06:36 PM »

Yes, you're right. 1963 was the first use by Chevrolet for this style of air induction. The W-series (409 style) 427 Z-11
engine used a modestly different looking cowl plenum air cleaner than the MKII "Mystery Motor" Impalas used at Daytona.
Logged

Jon Mello
CRG
1109RWHP
Member
***
Posts: 93



View Profile Email
« Reply #23 on: June 30, 2013, 11:20:48 PM »

Has anyone tested the power gain from an open element filter to a cowl induction setup? Just curious if it actually was a benefit.
Logged
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #24 on: July 01, 2013, 12:09:10 AM »

There's no doubt it's a benefit but I haven't seen published figures that show what the horsepower gain was.
There would be more benefit on a course with longer straights where a car sustained higher speeds for longer
time (Daytona and Sebring) than there would be for shorter tracks with slower speeds.
Logged

Jon Mello
CRG
MO
Member
***
Posts: 301


View Profile
« Reply #25 on: July 01, 2013, 09:48:18 PM »

If it didn't work better, they wouldn't still be using it in NASCAR.
Logged
motorman
Member
***
Posts: 94



View Profile Email
« Reply #26 on: July 02, 2013, 02:20:36 PM »

Has anyone tested the power gain from an open element filter to a cowl induction setup? Just curious if it actually was a benefit.
you gain 1% in HP for every 10 degrees you lower the intake air temp
Logged

new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08.
motorman
Member
***
Posts: 94



View Profile Email
« Reply #27 on: July 02, 2013, 02:24:05 PM »

also those systems cause air turbulence around the carb air bleeds unless you use the L-88 screen on top of the carb to straighten out the air flow if you run without a air filter
Logged

new Camaros owned 68 and 69 Z-28. new Corvettes owned 59,62,63,64,65,66,97,99 02,05 and 08.
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #28 on: July 02, 2013, 09:00:09 PM »

also those systems cause air turbulence around the carb air bleeds unless you use the L-88 screen on top of the carb to straighten out the air flow if you run without a air filter

That's a good tip. Thanks.
Logged

Jon Mello
CRG
Jon Mello
CRG Member
*****
Posts: 3147



View Profile
« Reply #29 on: September 01, 2013, 01:15:28 AM »

If someone is needing a cowl plenum air cleaner for their Trans-Am Camaro or street car, there's one for sale on ebay right now with a buy-it-now of $3,000.

http://www.ebay.com/itm/1967-1968-Z28-Camaro-Trans-Am-Cowl-Plenum-Air-Cleaner-SCCA-Smokey-Yunick-/121168600120
Logged

Jon Mello
CRG
Pages: 1 [2] 3  All Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.083 seconds with 18 queries.