Re: Cam phasing vs. intake reversion
[Re: BradH]
#825535
10/09/10 01:14 PM
10/09/10 01:14 PM
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Joined: Feb 2007
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maximum entropy
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i would get the appropriate cam. if you advance the cam, you'll have pulse reversion, and if you retard it, you'd get pulse and exhaust. i think. or is it the other way around?
for what is the good life if not doing things thoughtfully?
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Re: Cam phasing vs. intake reversion
[Re: HEMIFRED]
#825541
10/09/10 04:47 PM
10/09/10 04:47 PM
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Joined: Jan 2003
Posts: 15,439 Val-haul-ass... eventually
BradH
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Taking time off to work on my car
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Quote:
where is the occurring and why assuming a likelihood ?
When Dwayne P. freshened up the heads, he mentioned seeing more indications of reversion in the intake ports than expected. The cam's worked well on the dyno and the track, but might have a bit more overlap than "ideal" for a full exhaust system and street-driven car. No plans at this point to change the cam (again), so I was curious if the phasing might have any impact on it.
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Re: Cam phasing vs. intake reversion
[Re: BradH]
#825543
10/09/10 05:34 PM
10/09/10 05:34 PM
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Joined: Nov 2003
Posts: 5,160 Texas
dannysbee
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Did the reversion occur at cruising speeds or wide open throttle or both? Without knowing that, it would be hard to know if it was hurting your performance.
Getting old just means you were smarter than some and luckier than others.
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Re: Cam phasing vs. intake reversion
[Re: dannysbee]
#825544
10/09/10 06:20 PM
10/09/10 06:20 PM
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Posts: 15,439 Val-haul-ass... eventually
BradH
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Quote:
Did the reversion occur at cruising speeds or wide open throttle or both? Without knowing that, it would be hard to know if it was hurting your performance.
How would somebody be able to tell under what conditions it was happening?
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Re: Cam phasing vs. intake reversion
[Re: Brian Hafliger]
#825545
10/09/10 06:24 PM
10/09/10 06:24 PM
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Joined: Jan 2003
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BradH
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Quote:
What are the engine/cam/exhaust specs?
RB 452 w/ ported Stage VI heads, 10.8 CR, Comp XX 266 @ .050", .600", 1.5 rockers, 108 LSA (104 ICL measured at .050"), Victor 4150 intake w/ BG 4150 carb w/ 1.42" venturi x 1.75" throttle, 2" TTI headers & 3" x-pipe exhaust system.
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Re: Cam phasing vs. intake reversion
[Re: BradH]
#825548
10/09/10 08:11 PM
10/09/10 08:11 PM
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Joined: Nov 2003
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dannysbee
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Brad I was just making a point. But you could clean every thing up, take it out and cruise it a bit then pull the intake.
Getting old just means you were smarter than some and luckier than others.
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Re: Cam phasing vs. intake reversion
[Re: HEMIFRED]
#825550
10/09/10 09:39 PM
10/09/10 09:39 PM
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Posts: 12,675 Columbia, CT
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I think the reversion may be occuring at lower rpms and less than WOT. Kind of what I think Fred's talking about.
Well, art is art, isn't it? Still, on the other hand, water is water! And east is east and west is west and if you take cranberries and stew them like applesauce they taste much more like prunes than rhubarb does. Now, uh... Now you tell me what you know.
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Re: Cam phasing vs. intake reversion
[Re: BradH]
#825552
10/09/10 10:20 PM
10/09/10 10:20 PM
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Joined: Jan 2003
Posts: 5,486 SoCal
Brian Hafliger
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Quote:
Quote:
What are the engine/cam/exhaust specs?
RB 452 w/ ported Stage VI heads, 10.8 CR, Comp XX 266 @ .050", .600", 1.5 rockers, 108 LSA (104 ICL measured at .050"), Victor 4150 intake w/ BG 4150 carb w/ 1.42" venturi x 1.75" throttle, 2" TTI headers & 3" x-pipe exhaust system.
If it was driven on the street even a short time you'll see exhaust in the intake tract. Sometimes all the way up to the carb! No way to get rid of it carbed. I will say that with full exhaust system, I will run as much as 12° split between intake and exhaust lobes. Brian
Brian Hafliger
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Re: Cam phasing vs. intake reversion
[Re: HEMIFRED]
#825553
10/09/10 10:25 PM
10/09/10 10:25 PM
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Joined: Jul 2010
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HEMIFRED
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now here's a chart to follow use only the red path unless it's past 5pm and you are using 89 pmup. otherwise the black and race gas
home of the Sox and Martin Hemi Duster
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