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Re: PORTER RACING HEADS STAGE II PORT ON BB EDD
[Re: Labratt]
#1081259
09/24/11 10:12 PM
09/24/11 10:12 PM
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Joined: Aug 2006
Posts: 2,141
junction city oregon
viperblue72
top fuel
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top fuel
Joined: Aug 2006
Posts: 2,141
junction city oregon
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Quote:
Remi..are the deals from Indy directly? I've heard of WAY TOO MANY horror stories dealing with them! I believe Dwayne's a distributor for them,though. I'll see what he says!....Chad,I'm sure opening up the ports will take some velocity away..i.e TORQUE! But..maybe the milling will help to offset some of the torque loss.  I'll have to discuss this with Dwayne,as well! All I know is if getting the heads ported,and raising the compression to what HE thinks will handle pump premium...results in CONSISTENT 10.9-11.0's....I'll be VERY HAPPY!    
Hey I didn't say it wouldn't be a trade off that wouldn't be worth it. The gains up top will more than make up for the small torque loss at the bottom. And depending on the converter it may not be noticed at all.
Do the stage 2 porting and I promise you will notice a huge power gain. Once that not just the timeslip will notice but the seat of your pants is gonna feel a HUGE gain too.
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Re: PORTER RACING HEADS STAGE II PORT ON BB EDD
[Re: Labratt]
#1081263
09/25/11 06:28 PM
09/25/11 06:28 PM
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Joined: Feb 2005
Posts: 4,340
Prospect, PA
BSB67
master
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master
Joined: Feb 2005
Posts: 4,340
Prospect, PA
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Hmmmm. Cylinder pressure is higher than I would have thought for a 10:1 CR and a cam that large.  Do you know your deck height, valve notch volume, gassket thickness and head volume? Is it a zero deck 6-pack piston...I don't remember. We're doing good. I'll be back up in Mich. pulling the dock next weekend. Seems like I just put it in.
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Re: PORTER RACING HEADS STAGE II PORT ON BB EDD
[Re: Labratt]
#1081265
09/26/11 12:48 AM
09/26/11 12:48 AM
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Joined: Jun 2003
Posts: 52,972
Romeo MI
MR_P_BODY
Master
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Master
Joined: Jun 2003
Posts: 52,972
Romeo MI
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Quote:
Russ..my deck heights avg. 10.715"..gasket thickness compressed is .039..the pistons are Diamond flat tops,and the chamber volume is 84cc. Have an idea on the MAX comp. ratio?
Randy the cam has a BIG play with what the real(dynamic)
compression is... when the intake closes
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