113 SnS rebuild..
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Seasoned HDF Member
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From: poway
Yeah, I kinda figured that out..
Mildly acidic is OK. Vinegar works OK but the phosphoric acid does better..
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From: Florida
In regards to the intake spacer topic.. it’s not as much about flow adding or deleting length. It’s more about cam to valve timing. Figuring out the right length can greatly aid valve overlap to make more power at higher rpm’s. Couple it with tuned exhaust (length) and for scavenging and sonic pulses and it really does make a difference. There are mathematical formulas that are close and get you in the ball Park. When it’s right you’ll know it. You’ll feel it. It just flat grows legs on the top end like you hit a subtle bottle
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From: Niles Canyon Ca.
In regards to the intake spacer topic.. its not as much about flow adding or deleting length. Its more about cam to valve timing. Figuring out the right length can greatly aid valve overlap to make more power at higher rpms. Couple it with tuned exhaust (length) and for scavenging and sonic pulses and it really does make a difference. There are mathematical formulas that are close and get you in the ball Park. When its right youll know it. Youll feel it. It just flat grows legs on the top end like you hit a subtle bottle
Thread Starter
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Seasoned HDF Member
Joined: Dec 2005
Posts: 19,922
Likes: 8,027
From: poway
In regards to the intake spacer topic.. its not as much about flow adding or deleting length. Its more about cam to valve timing. Figuring out the right length can greatly aid valve overlap to make more power at higher rpms. Couple it with tuned exhaust (length) and for scavenging and sonic pulses and it really does make a difference. There are mathematical formulas that are close and get you in the ball Park. When its right youll know it. Youll feel it. It just flat grows legs on the top end like you hit a subtle bottle
Grand HDF Member
Joined: Sep 2022
Posts: 4,470
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From: Florida
one of the combos at 13:1 with the bandit cam I used a angled 4 5/8 elbow with a 1” spacer. So it changes with your combo.
Flow… velocity..? Lol Shovels.. beloved Shovel suck, those massive hemi chambers are never gonna be efficient. (Relative term) so you use more compression, obnoxious lift, lots of rpm to jam/ram as much of that angry temperamental mix through there and you keep your rpm’s up where your scared and the guy in the lane beside you is even more terrified from that noise his rubber mounted Twinkie has never made. I’m just learning and my journey really is just beginning with EVO so I’m not sure what’s applicable and what isn’t.. but I personally believe in the shovel world valve overlap is your secret compromise weapon.
Last edited by Rains2much; Jan 21, 2023 at 03:39 PM.
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From: Canada
I see the spacer as being no different than adding a 1" spacer under a carb on a car engine, it increases what plenum volume is there even if it's what you would consider a very small plenum.
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From: Florida
Side note.. How I tune drag pipes is to start at 40”.. cut an inch run two passes.. cut an inch run two passes cut an inch run two passes….. I did that until Mph averages went up.. then I kept doing it until it went down. Then I took a new set of 40” and cut one Inc longer then the experimental pipes. I use to have 3 sets I kept at different lengths to get as close as possible… here’s the kicker, change compression, cams.. start over. Edgwater, Dragway 42, KilKare were favorites around 2002-2003.
Now don’t be to hard on me.. years ago, nobody to help or learn from. Those days I was flyin blind with nothing but an empty wallet a local track and a few books.
‘Here’s some notes from way back on intake pulses and rpm’s based on a 11.7:1 93” and a M grind cam. 5300 rpm was used because that was right in the middle of my power band between shifts. As you can see I intentionally over shot the power where most would with that cam. I did this on purpose because of my torque curve and using 3 gears in the quarter.
Last edited by Rains2much; Jan 21, 2023 at 03:29 PM.
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Grand HDF Member
Joined: Sep 2022
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From: Florida
from the back of the valve to when it hits the atmosphere.. that length can be tuned to take advantage of those pulses at a given rpm. True of intake, true of exhaust.
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Seasoned HDF Member
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From: poway
The main thing that you are missing is that a car has a plenum, the HD does not..