#1  
Old 03-09-2020, 10:40 PM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default Anti reversion plates?

I’m thinking of trying an anti reversion plate on my Tiger head/ intake 535. Has anybody tried there and what are your thoughts. I see several companies make these.

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #2  
Old 03-10-2020, 12:48 AM
S/st 54's Avatar
S/st 54 S/st 54 is offline
Ultimate Warrior
 
Join Date: Jan 2012
Location: Missouri
Posts: 1,987
Default

Quote:
Originally Posted by jimmy daniel View Post
I’m thinking of trying an anti reversion plate on my Tiger head/ intake 535. Has anybody tried there and what are your thoughts. I see several companies make these.
It’s trial and error. Some motors like other spacers more than others.

I tried a anti reversion plate on my Pontiac motor,it helped and picked up the car a bit. I tried and found my Stinnet spacer worked much better.
That was without my #1 stop on the intake. Just the carb/spacer/intake.

__________________
"You have to evaluate the past,Focus on the future,and that tells you what you have to do in the present"--Lou Holtz


“It’s the process it takes to get to goals that sets us apart, the execution on every single play, one play,one life”
Notre Dame Head Coach Marcus Freeman

69 GTO NHRA Super Street Car
2860lbs 10.890@157.08 MPH in Iowa in June’23 ,157.56 MPH in Gainesville in March ‘23
  #3  
Old 03-10-2020, 06:19 AM
steve25's Avatar
steve25 steve25 is online now
Ultimate Warrior
 
Join Date: May 2008
Location: Westchester NY
Posts: 14,631
Default

There's no cut in stone answer on this , but in general that kind of Carb spacer helps to dampen reversion pulses when your intakes Plenum is short on volume to do the dampening.

In a motor like yours with a proper sized/ tuned Intake runner lenght the normal reversion pulse that takes place in a NA motor will stop and reverse at a distance of about 1 1\2" beyond the end of the runner, not up closer to the bottom of the Carb where it can push air and fuel back up out of the Carbs Venturi.

__________________
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!
  #4  
Old 03-10-2020, 09:12 AM
slowbird's Avatar
slowbird slowbird is offline
Ultimate Warrior
 
Join Date: Jan 2001
Location: Montgomery, IL
Posts: 10,638
Default

Bill C really seems to like them on the Tiger intake. Might want to contact him.

  #5  
Old 03-10-2020, 09:19 AM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default

I’ve got a 2” KVH tapered spacer on there now but it’s simply too tall. I’ve got to find something 1/2” to 1” that’s why I’m looking. I “heard” in the past that it works well in the Tiger intake?

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #6  
Old 03-10-2020, 09:41 AM
Gary H's Avatar
Gary H Gary H is offline
Ultimate Warrior
 
Join Date: Feb 2002
Location: Jacksonville
Posts: 1,320
Default

Jimmy, I put Wilson Manifold shear plates under my dual Holley carbs and it picked up .10 in the 60 ft time. Car was much more responsive off the line. I had to send them the manifold top for them to cut down so they would fit but in my opinion it was worth it.

__________________
62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
  #7  
Old 03-10-2020, 02:56 PM
455-4+1's Avatar
455-4+1 455-4+1 is offline
Ultimate Warrior
 
Join Date: Apr 2002
Location: New Zealand
Posts: 1,353
Default

Have seen the Reher Morrison 2 piece one work well within a narrow RPM range (target range) on a 400.
It was probably correcting a runner length / cam / exhaust tuning issue, but with a single 4 it's a little hard to change alot there.
Trial a d error is the only way, and it may only work in a narrow range, but it could be a cheap fix for a hole in a Tq curve as well until the real issue is found./solved

__________________
Working on going faster (and now staying dry at the same time !!)
  #8  
Old 03-10-2020, 03:20 PM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default

Quote:
Originally Posted by Gary H View Post
Jimmy, I put Wilson Manifold shear plates under my dual Holley carbs and it picked up .10 in the 60 ft time. Car was much more responsive off the line. I had to send them the manifold top for them to cut down so they would fit but in my opinion it was worth it.
It might work well with my throttle stop as well.

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #9  
Old 03-10-2020, 04:13 PM
Mike Davis's Avatar
Mike Davis Mike Davis is offline
Ultimate Warrior
 
Join Date: Jun 2000
Location: Athens Ga, or at a NMCA race
Posts: 1,994
Default

Quote:
Originally Posted by 455-4+1 View Post
Have seen the Reher Morrison 2 piece one work well within a narrow RPM range (target range) on a 400.
It was probably correcting a runner length / cam / exhaust tuning issue, but with a single 4 it's a little hard to change alot there.
Trial a d error is the only way, and it may only work in a narrow range, but it could be a cheap fix for a hole in a Tq curve as well until the real issue is found./solved
I am running the Reher Morrison plates on my 446 with the Wenzler Tunnel Ram. Car picks up a tenth with them.

__________________
66 GTO Nostalgia Super Stock/Street Legal Car
421 CID, stock block, Wenzler Intake, 2- Carter 750 AFB's, 3.90 Gears, Full Factory Interior, Full Exhaust, Stock Suspension 3750LBS 9.77@136.99
Multiple NSCA/NMCA World Champion

66 GTO 389 3x2, 4 speed, 4.33 gear, Montero Red 33K original Miles
67 GTO 2dr Post, 428, Tri Power, 3.55 Gears
80 Trans Am Black SE Y84 W72 WS6
  #10  
Old 03-10-2020, 05:39 PM
Gary H's Avatar
Gary H Gary H is offline
Ultimate Warrior
 
Join Date: Feb 2002
Location: Jacksonville
Posts: 1,320
Default

Quote:
Originally Posted by jimmy daniel View Post
It might work well with my throttle stop as well.
I would think it would.

__________________
62' Lemans, Nostalgia Super Stock, 541 CI, IA2 block, billet 4.5" crank, Ross, Wide port Edelbrocks, Gustram intake, 2 4150 style BLP carbs, 2.10 Turbo 400, 9" w/4:30 gears, 8.76 @153, 3100lbs
  #11  
Old 03-11-2020, 09:06 AM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default

I ordered the Reher and Morrison plate and we,ll see how it works. I’ll report back if it helps.

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #12  
Old 03-11-2020, 11:39 AM
RUDOLFSSON's Avatar
RUDOLFSSON RUDOLFSSON is offline
Chief Ponti-yacker
 
Join Date: Mar 2002
Location: Kopavogur, Iceland
Posts: 990
Default

I made two of these some years ago for my father... Extra thin mounting pad.. Built for a big wenzler gutsram 517 engine running two 1050 carbs I think..... Not reporting any hp gains but the engine ran a lot smoother and had much better throttle response afterwards.


__________________
*** THE BIG BRACE is here ***
  #13  
Old 03-11-2020, 03:55 PM
Dragncar Dragncar is offline
Ultimate Warrior
 
Join Date: Mar 2004
Location: Humbolt County California
Posts: 8,283
Default

How do these compare with a "Super Sucker" type spacer ? The Reher Morrison plate are not expensive at all compared to a SS.

  #14  
Old 03-11-2020, 06:28 PM
Mark G Mark G is offline
Suspended
 
Join Date: Nov 2017
Location: Northern Ontario
Posts: 975
Default

Quote:
Originally Posted by 69GTO View Post
I made two of these some years ago for my father... Extra thin mounting pad.. Built for a big wenzler gutsram 517 engine running two 1050 carbs I think..... Not reporting any hp gains but the engine ran a lot smoother and had much better throttle response afterwards.

Holy skills Batman.. really nice job I use a super sucker right now maybe I will try a reversion plate ..

  #15  
Old 03-11-2020, 08:36 PM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default

Quote:
Originally Posted by Mark G View Post
Holy skills Batman.. really nice job I use a super sucker right now maybe I will try a reversion plate ..
That looks bad a$$ !!

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #16  
Old 07-30-2020, 11:31 AM
Allan Runions2's Avatar
Allan Runions2 Allan Runions2 is offline
Junior Member
 
Join Date: Jan 2016
Location: Jamesville NY
Posts: 27
Default

Quote:
Originally Posted by jimmy daniel View Post
I ordered the Reher and Morrison plate and we,ll see how it works. I’ll report back if it helps.
Well... Did it help?

__________________

93 GP chrome-moly round tube car. 525 IA2. STD E-Heads by S&D, Steel rods, ALKY injected. S/pro car. Best ET 8.25@163mph

65 GTO back-half car. 468 e-headed S/pro car. 9.30-40s
(Sold to my father)

81 Lemans wagon. 10.70 pro/no box car. SOLD
  #17  
Old 07-31-2020, 11:53 PM
cfmcnc cfmcnc is offline
Chief Ponti-yacker
 
Join Date: Dec 2008
Location: New Jersey
Posts: 686
Default

The most popular Reversion plates with ditch surrounding a shear lip works best when the port SEES the ditch and it is not shrouded from the view up the port to the ditch.What happens is in milliseconds of the exhaust energy pulse pushing back up the roof of the intake tract slames into the ditch and turns around coming down the shear lip side pulling on the incoming charge helping accelerate the incoming charge.Bill C.

__________________
Checkered Flag Machine & Ceralli Competition Engines
Racing engines and induction development

http://www.checkeredflagmachine.net/
  #18  
Old 08-01-2020, 09:42 AM
jimmy daniel's Avatar
jimmy daniel jimmy daniel is offline
Ultimate Warrior
 
Join Date: Apr 2000
Location: Montgomery,Ala. 36117
Posts: 1,912
Default

Quote:
Originally Posted by Allan Runions2 View Post
Well... Did it help?
The NHRA season shut down until recently. The Southern National will be my next race and then I’ll know

__________________
1965 TriPower GTO, 1967 GTO, 1969 GTO, 1969 Judge, 1972 GTO, 1977 Smokey and the Bandit, 1989 TA ProStreet, 1968 Firebird NHRA 10.90 racecar, 1963 Tempest S/Gas
  #19  
Old 08-01-2020, 07:21 PM
Half-Inch Stud's Avatar
Half-Inch Stud Half-Inch Stud is offline
Ultimate Warrior
 
Join Date: Jul 2000
Location: BlueBell, PA or AL U.S.A.
Posts: 18,457
Default

Im sure reversion starts on the exhausr side. and Solved with the exhaust Collector length.

The word SOLVED being used. Surely the Cam profile (overlap) begins the need for a sufficient exhaust Collect length.

Seems to me, the only way to push fuel/air back up the carb venturis is with Exhaust-originated reversion.

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 09:48 AM.

 

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