MoparFins

Please login or register.

Login with username, password and session length
Advanced search  

News:

We changed servers, which is good, and lost all passwords, which is bad. See above.

Pages: 1 [2] 3 4 ... 19   Go Down

Author Topic: Performance/economy upgrades for Mopar Small Block  (Read 13081 times)

Stan Paralikis

  • Hero Member
  • *****
  • Karma: +0/-0
  • Posts: 114897
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #15 on: January 02, 2010, 02:25:33 AM »

Looks good.  Truthfully? My A.D.D.  wouldn't allow me to have the patience to sit over those things doing that kind of stuff.  Good job.

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #16 on: January 02, 2010, 05:07:11 PM »

Stan
 
Once you know how to do it, it's a couple of hours per head.  It took me a week to complete this as I was being tudored on line by a guy who knows how.  I'll attach the link at the bottom so you can entertain yourseld on the REAL POLARACO!  When I'm down to business.
 
This type of porting is for low end torque and economy.  If I polished the intake ports completely, it would be a high RPM motor.  But this is for a 600 to 3000 RPM range.
 

 

 

 

 

 

 

 

 
http://www.allpar.com/forums/index.php?showtopic=120339&st=100&gopid=1110888&#entry1110888
 
POLARACO2010-01-02 22:09:37
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #17 on: February 06, 2010, 05:52:09 PM »

Ok  Boys. . .Here is some lessons I learned.
 
If you are using Hyperutectic pistons, you need to bevel the bottom of the bores in the block.  This prevents the sharp edges from scraping off the coating on the pistons.
 
If you are going to a shorter duration higher lift cam, like I did, .459 (I) .471 (E) Lift @ 1.5 Ratio, 192* (I) 204* (E) Duration, You need to change the valve springs to dual spring.
 
The use of Cleavite (Trimetal) for a street engine is the best way to go.
 
When porting the heads, like I did, you polish the exhaust ports and leave the intakes rough.  Eliminate all the sharp edges in the ports.
 
Bevel the intake side out to the head gasket.  I'll take a couple of pics tomorrow to show you how.  You need to do the same on the exhaust ports.
 
Make sure the oil holes on the crank are beveled on the bearing surface.  This allows the oil to flow better on the bearings and keep them floating.
 
Chrome Moly rings are a great upgrade.  Especially one that has been just machined.
 

Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Herman

  • Hero Member
  • *****
  • Karma: +0/-0
  • Posts: 528
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #18 on: February 07, 2010, 12:08:55 AM »

Quote
Ok  Boys. . .Here is some lessons I learned.



If you are using Hyperutectic pistons, you need to bevel the
bottom of the bores in the block.  This prevents the sharp edges from
scraping off the coating on the pistons.

Cylinderbores are always beveled. This helps the piston-rings enter the bores more easily when installing them. Without the bevel they might hang and break during assembly.

Quote
If you are going to a shorter duration higher lift cam, like I
did, .459 (I) .471 (E) Lift @ 1.5 Ratio, 192* (I) 204* (E) Duration,
You need to change the valve springs to dual spring.

Different types of cams require different types (strenghts) of valvesprings.



Quote
The use of Cleavite (Trimetal) for a street engine is the best way to go.

You mean 'stock' ;)

 
Quote
When porting the heads, like I did, you polish the exhaust ports
and leave the intakes rough.  Eliminate all the sharp edges in the
ports.

Well, you got the 'roughness' covered very well I see.
At first glance I thought you had just sandblasted a couple of very rusted cylinder heads.
Now get out the sandpaper grinding wheel and make the cylinder headchambers smooth and shiny.
BigBlockMopar2010-02-07 05:09:27

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #19 on: February 07, 2010, 06:58:18 AM »

Nooooooo
 
This is not a race motor.  The cylinders are left like that for better turbulance at lower RPM.
 
You are missing what this is being built for.  The RPM range is idle to 3000.  The target is torque, not HP.
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #20 on: February 07, 2010, 07:05:18 AM »

Quote from: BigBlockMopar
Quote
Ok  Boys. . .Here is some lessons I learned.
Cylinderbores are always beveled. This helps the piston-rings enter the bores more easily when installing them. Without the bevel they might hang and break during assembly.
 
Yes.  The idea was to make them think and research the springs.  They will need Caps too when changing the springs in many cases.
 
You mean 'stock' ;)
 

 

If I said any more, they wouldn't read the whole thing.
 
Your points are valid.  It's all food for thought
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Guests

  • Guest
Performance/economy upgrades for Mopar Small Block
« Reply #21 on: February 09, 2010, 08:38:26 PM »

I bet I know all about the port surface remaining the way it is with the carbide burr cutter texure to relieve surface tension and prevent fuel from sticking to the surface, the way polished surfaces allow fuel to stick to smooth surfaces at low rpm. Yeah, took the plunge and joined.

Ed
Logged

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #22 on: February 10, 2010, 05:29:03 AM »

Wow Ed!  Glad to have you!
 
[color=#ffff00 size=7]WELCOME[/color]
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #23 on: February 10, 2010, 05:29:47 AM »

Guys

This is the guy who tought me how to port my heads!
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Stan Paralikis

  • Hero Member
  • *****
  • Karma: +0/-0
  • Posts: 114897
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #24 on: February 10, 2010, 06:52:07 AM »

If he could teach even you, then he's AOK in my book.
 


Guests

  • Guest
Performance/economy upgrades for Mopar Small Block
« Reply #25 on: February 10, 2010, 07:03:15 AM »

Thanks guys, glad to be here. Been porting heads (no Japanese please, exception being pre 1969), for 30+ years, and all those articles out there miss the important stuff. They can get flow numbers out, but they don't consider the flame travel itself. When I read thing like, "Lift greater than .500 is not any good because flow interference between the head and the valve is too great", I know there is a porting problem, not a cam problem. Dyno curves after the fact tell another story, jumps and dips are poor porting jobs in my book.  My mentor taught me well, and if I can teach Polaraco, I can teach anyone, or do them for you, no pressure. I'm retired Navy (26 years) and money isn't my motivator (imagine that).
dana442010-02-10 12:04:16
Logged

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #26 on: February 10, 2010, 08:26:13 AM »

Damned Swabbies.  Just as bad as Damned Kids
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Guests

  • Guest
Performance/economy upgrades for Mopar Small Block
« Reply #27 on: February 10, 2010, 01:34:07 PM »

Yeah, I agree. Then again, when the nearest land is three days away, something breaks and something needed fixed, the Chief Engineer would come to me with his best mechanic and machinist and ask how to get it fixed. Kind of like that Apollo 13 scene where a guy dumps a dozen things on a table and said, "this is what we have to work with, make it work."
 
Yeah, damn kids...
Logged

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #28 on: February 10, 2010, 01:37:20 PM »

I coined that phrase. . .   We have a few around here.  But then again, anyone younger than me is still considered a Kid.     
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted

Steve

  • Administrator
  • Hero Member
  • *****
  • Karma: +1/-0
  • Posts: 8653
    • View Profile
Performance/economy upgrades for Mopar Small Block
« Reply #29 on: February 11, 2010, 09:06:40 AM »

BTW Ed
 
My magnum deck is about .03 out.  I'm leaving it.  Goint to try to measure the CC of the cylinders and them going to measure the intakes with the same fluid measuring.
Logged
Favorite Expression. . . Damned Kids.  Lots of projects.  Donations accepted
Pages: 1 [2] 3 4 ... 19   Go Up
 

© 2008-2014 Steve Hobby • © 2015 Allpar, LLC