sbc crank question - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 02-14-2004, 04:25 PM
Member
 
Join Date: Jan 2004
Location: Hayden AL
Age: 30
Posts: 104
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
sbc crank question

will a stock cast iron crank withstand 400-450 hp? if so what about rpms (im going to be turning at the most 6,500-6,800) and if it matters im talking about a 350 crank and im using eagle sir rods, and it is a 4-bolt main block with ARP main bolts

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-14-2004, 04:44 PM
killerformula's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Carburetor
Last journal entry: Clean up
Last photo:
Join Date: Oct 2003
Location: Northeast
Age: 34
Posts: 3,485
Wiki Edits: 3

Thanks: 13
Thanked 27 Times in 18 Posts
You will prroooooobably be ok. Its not your HP that is going to do it, its the R's. BTW, you can make that hp at much lower RPM, why not do that?

Read this link for more info:

duability secrets

K

Oh yeah, btw, get it ballanced and you're in much better shape.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-14-2004, 04:51 PM
Member
 
Join Date: Jan 2004
Location: Hayden AL
Age: 30
Posts: 104
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
because im runing a high axle ratio (4.10)
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-14-2004, 06:06 PM
lluciano77's Avatar
Short changed on common sense
 
Last photo:
Join Date: Jun 2003
Location: california
Age: 37
Posts: 3,548
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
A higher gear ratio should make it easier on the crank. There will be less load. It won't be able to spin more RPMs though, and with higher numerical gears your RPMs will come up a lot quicker.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-14-2004, 08:48 PM
Member
 
Join Date: Jan 2004
Location: Hayden AL
Age: 30
Posts: 104
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
well thanks for the reply guys, some very good thoughts, what price range could i get a good forged crank for and is there any downsides to a forged crank?
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-14-2004, 09:12 PM
Member
 
Join Date: Jan 2004
Location: Virginia Beach, Va
Age: 49
Posts: 51
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The only downside to forgings is price. I have an Eagle 4340 forged 383 crank in my truck. I got it off E Bay N.I.B. for $400 some. They are up over $600 now @ Summit. Shop around, and whatever you do invest in having the entire assy balanced once you have everything. Pistons, rods, Crank, balancer, and flywheel/flexplate.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-15-2004, 08:10 AM
GTO 1965's Avatar
Member
 
Last photo:
Join Date: Jan 2004
Location: Mo.
Age: 63
Posts: 70
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
If you use the cast crank have the machine shop magnaflux it before they ever do anything to it, this will let you know if it has any cracks.

I've used cast cranks for years and turned them 6500 to 7000 with no problems!
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On



All times are GMT -6. The time now is 01:35 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.