383 stroker quick help - 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 11-11-2012, 07:44 PM
Registered User
 
Join Date: Oct 2010
Location: North Dakota
Posts: 66
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
383 stroker quick help

Bought a 935056 scat crank for a 383 im building and put the crank in and one piston/rod combo and on the down stroke the piston bottom hits the cranks counter weights. 5.7 rod. nowhere does it say on summit website that it has to be 6.0 or longer rod and was wondering if i can just grind off the excess to make it pass and go from there or should i return the crank and get a different one that will work? probe forged pistons. scat 5.7 cap screw rods.
thanks,
Logan

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-11-2012, 07:50 PM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
No you need the pistons fpr 5.7 rods. Call summit and tell them you they sent the wrong kit. Or you will need the longer rods. The pistons will not be at the correct deck height with the wrong rods. Since pins are moved since they are nade for longer rods. I wouldnt cut anything until you speak with them.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-11-2012, 07:53 PM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
Oh wait are you using stock pistons it wont work. You have to have stroker pistons. Usally a balanced kit is better then just buying parts.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-11-2012, 07:53 PM
Registered User
 
Join Date: Oct 2010
Location: North Dakota
Posts: 66
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The pistons are for 5.7 rods. everything is fine except for the pistons hitting the crank that is the only problem. this is not a kit i bought all of it separately.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-11-2012, 09:37 PM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
Quote:
Originally Posted by 69chevyLWB View Post
The pistons are for 5.7 rods. everything is fine except for the pistons hitting the crank that is the only problem. this is not a kit i bought all of it separately.
Are the pistons for a 383 or 350. 383 have the piston pin location moved so they dont hit the crank or push out of the cylinder. 383 pistonsnare also shorter to allow for the crank being larger. Only thing you should need to clearence is the block where the rod bolts get close to the wall of the block. I think you got parts miss match somewhere. I wouldnt cut on the pistons.

Is the deck hieght correct?

Just ran a google search the crank is for 6.0 inch rods only.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-11-2012, 10:02 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,082
Wiki Edits: 326

Thanks: 775
Thanked 1,057 Times in 879 Posts
Quote:
Originally Posted by hcompton View Post
Just ran a google search the crank is for 6.0 inch rods only.
OOOOOOoooooops.....
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-11-2012, 10:35 PM
Registered User
 
Last photo:
Join Date: Jan 2011
Location: Hopewell, Va
Age: 62
Posts: 1,216
Wiki Edits: 0

Thanks: 0
Thanked 119 Times in 115 Posts
383 stroker quick help

You need to contact Summit Racing asap to return the 400 crankshaft you purchased. This is the correct part number for the crankshaft you need. Scat Series 9000 Cast Pro Comp Stroker Lightweight Crankshafts 935050 - SummitRacing.com. It is reasons like this it is best to buy a complete rotating assembly. I am sure that if you had called Summit Racing to order a rotating assembly with the pistons of your choice they would have made one up. I purchased a rotating assembly with the pistons I chose for my 454 from CNC-Motorsports.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 11-12-2012, 09:54 AM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
Doesnt help now but summit has kits that use your stock rods and they sell you crank and pistons. But i like to buy the balaned rotating assembly with the balancer and flexplate. These usally make it cheaper in the long run most of the work is done before you go to the machine shop.

Hope this helps.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 11-12-2012, 10:50 AM
Registered User
 
Join Date: Oct 2010
Location: North Dakota
Posts: 66
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 11-12-2012, 01:06 PM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
Quote:
Originally Posted by 69chevyLWB View Post
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Jegs is the same way with the web site info being very lacking. I always search the parts i need and buy from jegs usally is cheaper and ppl seem to be more in the game. Summit always sends me the wrong ****.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 11-12-2012, 01:50 PM
Registered User
 
Last photo:
Join Date: Apr 2007
Location: Seattle, Wa
Posts: 6,903
Wiki Edits: 0

Thanks: 4
Thanked 465 Times in 400 Posts
Quote:
Originally Posted by 69chevyLWB View Post
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Actually whether or not you can get to internal balance with either the SCAT or Eagle crank has everything to do with the weights of the pistons and rods selected and whether or not you're willing to step up to the cost of Mallory metal slugs in the counterweights if the pistons and rods prove too heavy for the counter weight masses. This appies as much to what is advertized as internally balanced or externally. If I were you I wouldn't breath a sigh of relief untill this thing shows up at the balancing shop and they mock it up to see whether it'll balance inside or not.

Frankly for a street engine where the RPMs will seldom if ever hit in the upper 5000's or higher the difference between internal external balance is almost a moot point as on a crank pin to crank pin basis even internally balanced engines are not in balance from pin to pin they mightily depend upon the counterweights at the extreme ends of the shaft to put the assembly into balance as a whole. Therefore, there are substantial out of balance forces working on the inboard mains of 2, 3 and 4. This is why 4 bolt blocks are on the 2,3 and 4 main unless you're looking at a real race block that does 4 bolts on all the mains. So the externally balanced engine only moves some counter weight a little further toward the crank ends by placing the final balance up on the flywheel/flexplate and front damper. This puts a little more load on the number 1 and 5 journal while it creates little or no change to 2,3 or 4.

This is not as simple as the advertisers would suggest by data ommision or inclusion. You're not home free till the balance shop speaks.

Bogie

Last edited by oldbogie; 11-12-2012 at 02:01 PM.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 11-12-2012, 01:57 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,082
Wiki Edits: 326

Thanks: 775
Thanked 1,057 Times in 879 Posts
Quote:
Originally Posted by 69chevyLWB View Post
Thanks for your help but i know that the crank is for 6.0 rods now. im just saying that summit said northing at all about needing 6.0 rods. just bought another stroker crank. this one is from eagle because scat doesnt make a 3.75 stroker thats internally balanced that will take 5.7 rods. problem solved. just have to send the crank back to summit.
Measure all dimensions carefully on the Eagle crank. There have been issues.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 11-12-2012, 03:05 PM
Registered User
 
Last photo:
Join Date: Jul 2004
Location: At Speed
Age: 51
Posts: 1,373
Wiki Edits: 0

Thanks: 2
Thanked 36 Times in 34 Posts
Eagle will tell you what bobweight they balanced the crank to so you can tell if your bobweight is even close. All cranks from Eagle and Scat have to be balanced unless purchased in a kit that is a balanaced assembly.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 11-12-2012, 03:19 PM
hcompton's Avatar
Old & Furious
 
Join Date: Oct 2012
Location: MD
Age: 41
Posts: 1,074
Wiki Edits: 0

Thanks: 6
Thanked 87 Times in 84 Posts
This is why its best to buy a balanced rotating assembly then take it to the machine shop to be finished off. At least they had some monkey stand there with a dumpster full of pistons and a scale and kit something that is close before you walk into the shop. That way it will balance without major exspense. I have done them balanced and slap together. External balanced always works and works ok to 6k rpm. Internally balanced can lead to issues of how good the shop was that balanced the ***. And if you gave them parts that can be balanced together. One piston way to heavy or light and things get out of whack quickly and costly. One too light and all other 7 pistons need to be machined to match up. Been there done that. Stay external until your in the fully forged range if possible. Internal does not have any great advantanges unless your all out racing or running above 7k rpm. Street car its not needed.
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:
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
383 stroker v.s. 383 chrysler ...the end mcharger440 Engine 58 12-07-2012 08:16 AM
Need 383 stroker Help! LayLow50 Hotrodding Basics 15 12-06-2011 04:18 PM
383 stroker or 396 stroker crate engine augustine Hotrodding Basics 5 11-26-2011 11:12 AM
383 Stroker Help Dubbzy51403 Engine 1 10-15-2009 07:18 AM
Yes, a quick stroker question joeyg329 Engine 2 06-30-2004 07:29 AM


All times are GMT -6. The time now is 07:15 AM.


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.