#1  
Old 12-23-2019, 02:29 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default Single-plane Tri-Power?

I've put a lot of miles on Tri-Power Pontiac engines, but all with factory dual-plane manifolds. I often wonder how a single-plane Tri-Power manifold would perform (I think I asked on this forum quite a while ago but didn't get answers). I recently noticed that the Offenhauser 360 Equa-Flow manifold (1968 era) was a single-plane and available for three 2-bbls and (I think) available for Pontiac. Anybody here ever run one?

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #2  
Old 12-23-2019, 11:37 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,934
Default

I had two of the earlier 64 head Offy Tri-Power Intakes.
The intakes were actually pretty good about airflow thru the short runners and divided plenum. I cut one apart one time and there were a couple of "windows" between the two side by side plenums. So they fit the 360 manifold definition.
Not sure what the application was on the one I cut apart. Maybe sb chevy or sb ford.
Many many years ago.

The Pontiac intake I flowed on the SF 1200 flow bench, flowed about 270 cfm thru one short port.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
  #3  
Old 12-24-2019, 01:22 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default

Is the "360" manifold less satisfactory for everyday street use (mostly center 2-bbl) than a dual-plane manifold?

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #4  
Old 12-24-2019, 06:55 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,934
Default

The 360 manifold would operate like a 780 Holley 4 BBL's primaries on a single plane intake. A bit soft on the bottom end and maybe a bit more tuning required vs the calibration the Rochester Engineers put into the Factory Tri-Power 2 BBL but still not a big issue vs not running one of the things.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
  #5  
Old 12-25-2019, 01:34 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default

Thanks. Merry Christmas.

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #6  
Old 12-28-2019, 01:49 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default

I "thought" that Offy made the 360 3-2bbl manifold because their ad in January '68 Hot Rod said "...1, 2, and 3 carb" versions. However, after January they never again mentioned a 3 carb 360 manifold, just single- and dual-quad.
So... I suspect that nobody ever made a single-plane 3 2-bbl manifold for Pontiac... and maybe not for any engine.

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #7  
Old 12-28-2019, 01:57 PM
brut4s's Avatar
brut4s brut4s is offline
Chief Ponti-yacker
 
Join Date: Feb 2010
Location: Concord, Ca.
Posts: 536
Default

I don't know if you saw this but if not here you go the only single plane Tri-Power I know of for a Pontiac
https://headsandmanifolds.wordpress....3000-7500-rpm/

  #8  
Old 12-29-2019, 03:23 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default

Quote:
Originally Posted by brut4s View Post
... the only single plane Tri-Power I know of for a Pontiac...
Thanks for the link- I had not seen that. I'm sure Dave Wilcox has created a great manifold... but pricey. Nevertheless it interests me. An apples-to-apples test (dyno or track) would be good.

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #9  
Old 12-30-2019, 12:04 AM
433lemans's Avatar
433lemans 433lemans is offline
Senior Member
 
Join Date: Sep 2006
Location: Near Sioux Falls SD
Posts: 185
Default

Quote:
Originally Posted by Jack Gifford View Post
Thanks for the link- I had not seen that. I'm sure Dave Wilcox has created a great manifold... but pricey. Nevertheless it interests me. An apples-to-apples test (dyno or track) would be good.
Been following this for some time but it sure would be nice to "see" this manifold! No pics on the website yet unless I missed it?

  #10  
Old 01-07-2020, 10:05 PM
433lemans's Avatar
433lemans 433lemans is offline
Senior Member
 
Join Date: Sep 2006
Location: Near Sioux Falls SD
Posts: 185
Default

Quote:
Originally Posted by brut4s View Post
I don't know if you saw this but if not here you go the only single plane Tri-Power I know of for a Pontiac
https://headsandmanifolds.wordpress....3000-7500-rpm/
Who has seen it? It doesn't exist without pictures! Let's see it.

  #11  
Old 01-08-2020, 08:23 AM
brut4s's Avatar
brut4s brut4s is offline
Chief Ponti-yacker
 
Join Date: Feb 2010
Location: Concord, Ca.
Posts: 536
Default

Quote:
Originally Posted by 433lemans View Post
Who has seen it? It doesn't exist without pictures! Let's see it.
I'd like to see it also

  #12  
Old 11-03-2021, 09:05 PM
433lemans's Avatar
433lemans 433lemans is offline
Senior Member
 
Join Date: Sep 2006
Location: Near Sioux Falls SD
Posts: 185
Default bump

Quote:
Originally Posted by 433lemans View Post
Who has seen it? It doesn't exist without pictures! Let's see it.
Been plenty of time. Let's see it!

  #13  
Old 11-04-2021, 05:45 PM
misterp266's Avatar
misterp266 misterp266 is online now
Ultimate Warrior
 
Join Date: Jun 2005
Location: Raynham, MA
Posts: 1,669
Default Offy 360 tri power

Isnít this a single plane intake?

https://www.ebay.com/itm/35354808243...BoCmCoQAvD_BwE

Hereís another.
http://hotrodcarbs.com/store/offenha...-manifold.html
Attached Thumbnails
Click image for larger version

Name:	2C939BD4-EB85-411D-99CF-F74598ECB74D.jpg
Views:	250
Size:	60.8 KB
ID:	576928   Click image for larger version

Name:	D1E4D2BB-5231-4B7B-BABB-D3412194283A.jpeg
Views:	240
Size:	92.1 KB
ID:	576932  

__________________
" Darksiders Rule "
  #14  
Old 11-05-2021, 02:16 AM
Jack Gifford's Avatar
Jack Gifford Jack Gifford is offline
formerly 'Pontiac Jack'
 
Join Date: Dec 2004
Location: Phelps, NY 14532
Posts: 10,068
Default

Yes, that appears to be the Offenhauser Equa-Flow that I mentioned in the original post of this thread. I'm still wondering if anyone here ever ran it?

__________________
Anybody else on this planet campaign a M/T hemi Pontiac for eleven seasons?
... or has built a record breaking DOHC hemi four cylinder Pontiac?
... or has driven a couple laps of Nuerburgring with Tri-Power Pontiac power?
  #15  
Old 11-19-2022, 03:01 PM
cjs64goat cjs64goat is offline
Junior Member
 
Join Date: Oct 2014
Posts: 20
Default

That's been talked about for years. They used to offer porting a tripower intake for close to a grand and porting for end carbs. Haven't checked lately.

  #16  
Old 11-19-2022, 03:02 PM
cjs64goat cjs64goat is offline
Junior Member
 
Join Date: Oct 2014
Posts: 20
Default

Meant to reply to 433lemans H&M post.

  #17  
Old 12-28-2019, 10:03 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,934
Default

Jack, if you cut the top off of a 64 type Offy Tri-Power Intake I believe you will see the "communication windows" that basically make it act like a dual plane 4 bbl intake but with the plenum divider removed. Both barrels of each 2 bbl carb get the same signal at the same time.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
  #18  
Old 12-29-2019, 03:03 PM
Tom Vaught's Avatar
Tom Vaught Tom Vaught is offline
Boost Engineer
 
Join Date: Dec 2001
Location: The United States of America
Posts: 30,934
Default

Dave Wilcox did a very nice job porting my "Barry Grant 6-Shooter" (TRI-POWER) intake but the cost was not cheap, just like the single plane TRI-POWER intakes he is selling.

Tom V.

__________________
"Engineers do stuff for reasons" Tom Vaught

Despite small distractions, there are those who will go Forward, Learning, Sharing Knowledge, Doing what they can to help others move forward.
The Following User Says Thank You to Tom Vaught For This Useful Post:
  #19  
Old 12-22-2021, 06:29 PM
brut4s's Avatar
brut4s brut4s is offline
Chief Ponti-yacker
 
Join Date: Feb 2010
Location: Concord, Ca.
Posts: 536
Default

Troy Patterson (tmp carbs) is making one.
https://www.facebook.com/14380661198...3501/?sfnsn=mo

  #20  
Old 12-22-2021, 06:32 PM
brut4s's Avatar
brut4s brut4s is offline
Chief Ponti-yacker
 
Join Date: Feb 2010
Location: Concord, Ca.
Posts: 536
Default

Here are pics for those thay don't have Facebook
Attached Thumbnails
Click image for larger version

Name:	FB_IMG_1640212031166.jpg
Views:	223
Size:	76.8 KB
ID:	580389   Click image for larger version

Name:	FB_IMG_1640212035874.jpg
Views:	238
Size:	72.8 KB
ID:	580390   Click image for larger version

Name:	FB_IMG_1640212042960.jpg
Views:	219
Size:	78.2 KB
ID:	580391  

Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 01:32 PM.

 

About Us

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.

 




Copyright © 2017