#2411165 - 11/30/17 06:38 AM
Re: 470 dyno test article
[Re: Cab_Burge]
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top fuel
Registered: 01/19/03
Posts: 2042
Loc: 541 slobovia
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A PCV is a one way valve right? The spring shoves it closed with no vacuum and opens with around 2 + inches of vacuum, correct? If you apply vacuum to the ball side of the valve doesn't that suck it closed? Cab I removed the idle circuit ball, and the cruise circuit spring. Vacuum closes the cruise ball, and can only flow through the idle side. When CC goes positive, the valve can fully vent into the aircleaner. I did it with the Wagner adjustable PCV. It works really good. You have a PM
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#2411352 - 11/30/17 01:40 PM
Re: 470 dyno test article
[Re: AndyF]
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enthusiast
Registered: 06/28/06
Posts: 341
Loc: Virginia
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Not sure if I completely understand what you have here. Is that a "normal" breather in the top picture ? Bottom picture shows (2) adjustable pvc valves ? thanks for sharing this.
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#2411823 - 12/01/17 12:46 PM
Re: 470 dyno test article
[Re: A990]
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I Win
Registered: 08/23/03
Posts: 30539
Loc: Bend,OR USA
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I had issues on my old street pump gas 518 C.I. 400 stroker motor with the original six pack blowing oil out of the breather caps with two caps and one PVC valve when I raced it shifting at or above 7000 RPM, I added another PVC valve with a T to the vacuum side and that stop the problem  That also made the motor idle better which allowed me to lean down the idle mixture screws on all three carbs. a tiny bit 
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Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)
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#2426156 - 12/30/17 10:50 PM
Re: 470 dyno test article
[Re: AndyF]
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member
Registered: 06/14/13
Posts: 16
Loc: missouri,usa
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Andy,are the retainers Ti or tool steel and do you know the gram weight? Thanks
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#2426175 - 12/30/17 11:31 PM
Re: 470 dyno test article
[Re: AndyF]
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The Ultimate
Registered: 01/22/03
Posts: 1734
Loc: Mopar Country, Mi
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Have the new grind from Comp for this engine. They stepped it up with some new QRI and HXX HL lobes so now it is very aggressive. They also sent me some new dual conical springs to try. These springs are pretty trick. They are lightweight and they don't have the friction of an interference fit damper. I'll get the new parts installed on the 470 and back up on the dyno within the next few weeks. Should be interesting. Oh boy, conical springs  A big no no here Those springs are very nice ππΊπΈ
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#2426182 - 12/31/17 12:02 AM
Re: 470 dyno test article
[Re: cryplydog]
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Too Many Posts
Registered: 01/20/03
Posts: 23810
Loc: Oregon
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Andy,are the retainers Ti or tool steel and do you know the gram weight? Thanks The retainers I have are tool steel. Comp has Ti retainers for these springs but didn't think they were needed for my combo. This engine only spins to 7000.
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#2427503 - 01/01/18 09:34 PM
Re: 470 dyno test article
[Re: ccdave]
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Too Many Posts
Registered: 01/20/03
Posts: 23810
Loc: Oregon
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Not only do they save weight, they also help cancel valve train harmonics, require less pressure to control the valves than traditional duel springs and are made from better material. Yep, I'm looking forward to this round of dyno testing just to see if the new cam design and the new springs make any difference. I'm hoping we'll pick up 10 or 15 hp but it might not be that big of a difference.
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#2431731 - 01/09/18 03:42 PM
Re: 470 dyno test article
[Re: AndyF]
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I Live Here
Registered: 01/20/03
Posts: 16008
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Andy, I loved the comment that the wear marks on the valve springs took energy to make. Wow!
Folks, if you're pondering how AndyF makes power, it's because of understanding things like this.
Conical springs? It just freaks me out how the Spintron has pushed the understanding of valve train dynamics. Years ago Isky made a spring for smallblock Chevies that had a small end to fit in the spring pockets, and then ballooned out to 1.55or so for the rest of the way up to the retainer. They were beehive springs, but they were upside down.
BTW I need one new Isky 2005 valve spring to round out a set.
R.
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#2432216 - 01/10/18 11:58 AM
Re: 470 dyno test article
[Re: AndyF]
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top fuel
Registered: 11/24/03
Posts: 2107
Loc: New Lenox IL
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The conical springs save about 1 pound of weight over the existing dual springs. Also, the conical springs get rid of the interference fit damper. The damper in my existing springs is showing a clear wear pattern after just a few dyno pulls. Those wear marks took power to make and the ground up steel went into the oil system..... Along with taking power to make the witness marks, it created HEAT in the valve train. Andy this should be an interesting test! Thanks for your info! Don
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#2433392 - 01/12/18 11:31 AM
Re: 470 dyno test article
[Re: AndyF]
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top fuel
Registered: 11/24/03
Posts: 2107
Loc: New Lenox IL
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