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#1
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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.
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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
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Quote:
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.
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"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
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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.
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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! |
#4
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Bill C really seems to like them on the Tiger intake. Might want to contact him.
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#5
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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?
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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
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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.
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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
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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
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Working on going faster (and now staying dry at the same time !!) |
#8
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It might work well with my throttle stop as well.
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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
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Quote:
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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
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I would think it would.
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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
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I ordered the Reher and Morrison plate and we,ll see how it works. I’ll report back if it helps.
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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
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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.
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*** THE BIG BRACE is here *** |
#13
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How do these compare with a "Super Sucker" type spacer ? The Reher Morrison plate are not expensive at all compared to a SS.
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#14
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Quote:
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#15
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That looks bad a$$ !!
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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
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Well... Did it help?
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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
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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.
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Checkered Flag Machine & Ceralli Competition Engines Racing engines and induction development http://www.checkeredflagmachine.net/ |
#18
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The NHRA season shut down until recently. The Southern National will be my next race and then I’ll know
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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
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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. |
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