Re: 470 dyno test article
[Re: Cab_Burge]
#2411165
11/30/17 09:38 AM
11/30/17 09:38 AM
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Joined: Jan 2003
Posts: 2,731 541 slobovia
A990
master
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master
Joined: Jan 2003
Posts: 2,731
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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Re: 470 dyno test article
[Re: AndyF]
#2426175
12/31/17 02:31 AM
12/31/17 02:31 AM
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Joined: Jan 2003
Posts: 1,807 Mopar Country, Mi
ccdave
The Ultimate
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The Ultimate
Joined: Jan 2003
Posts: 1,807
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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Re: 470 dyno test article
[Re: cryplydog]
#2426182
12/31/17 03:02 AM
12/31/17 03:02 AM
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Joined: Jan 2003
Posts: 31,042 Oregon
AndyF
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,042
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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Re: 470 dyno test article
[Re: ccdave]
#2427503
01/02/18 12:34 AM
01/02/18 12:34 AM
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Joined: Jan 2003
Posts: 31,042 Oregon
AndyF
OP
I Win
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OP
I Win
Joined: Jan 2003
Posts: 31,042
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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Re: 470 dyno test article
[Re: AndyF]
#2432216
01/10/18 02:58 PM
01/10/18 02:58 PM
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Joined: Nov 2003
Posts: 2,131 New Lenox IL
cudadon
top fuel
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top fuel
Joined: Nov 2003
Posts: 2,131
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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