383 motor ideas? - 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 02-11-2007, 02:05 AM
Registered User
 
Join Date: Apr 2006
Location: Redondo beach ,CA
Age: 34
Posts: 335
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
383 motor ideas?

Im building an engine for a friend,a 383 stroker for his truck.He does'nt use this truck for towing or anything.He's looking for some strong power for the street.
383ci 10.7:1 cr
Aluminum 190cc heads 2.05/1.60
274H XE cam
1.6 Pro magnum roller rockers
Performer rpm intake
Speed demon 650cfm carb
50k Hei
the bottem end has:
5140 I-beam rods 6" bushed pins
5140 Forged crank
Hyperutectic pistons
Total seal gapless rings
Kings main/Rod bearings
4bolt main caps with ARP studs
Im wondering if this setup would be suitable for driving a few days a week?He has a 5spd Tremec trans in it.Also will this thing run premium pump fuel?Is this a good combo for what he's looking for?The truck is a 71' C10 lowered 4/6".

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 02-11-2007, 08:17 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,491
Wiki Edits: 0

Thanks: 1
Thanked 21 Times in 21 Posts
We have built a few 383's with 11:01 compression for the street and have used the Vortec heads and on the dyno they only required about 29 to 31 degrees timing and had no issues with pump gas.

Here is a link to another 383 we built with AFR's
http://www.chevelles.com/forums/show...highlight=DYNO
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 02-11-2007, 08:23 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 66
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
go to the comp cams site
click on "charts and graphs" under Technical
click on dyno results
pick a cam chart shown
click on the chart

complete motor build spec's given, in your example, 274H cam idle vac=11Hg at 800rpms, carbs want 15Hg around town

you build a motor around the cam for the results you want
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 02-11-2007, 03:10 PM
Registered User
 
Join Date: Apr 2006
Location: Redondo beach ,CA
Age: 34
Posts: 335
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So will 91 octane work?I know the newer corvettes run 11:1 everyday on the streets.I've looked at the comps dyno,but thier setup is far smaller than mines.Will this thing be a hassle to drive every now and then?He is really just looking for the power.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 02-11-2007, 03:33 PM
xntrik's Avatar
Save a horse, Ride a Cowboy.
 
Last photo:
Join Date: Jul 2005
Location: Arkansas
Posts: 5,131
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by bonzipenguins
So will 91 octane work?I know the newer corvettes run 11:1 everyday on the streets.I've looked at the comps dyno,but thier setup is far smaller than mines.Will this thing be a hassle to drive every now and then?He is really just looking for the power.

Newer Corvettes don't count. It's apples to onions.

It depends on what pistons you have.
Dished pistons will be a real challenge.
Reverse dome or flat top pistons with best squish might be OK.

Tuning will be critical on the razor's edge with 93.

If you are into the grooving thing, I would suggest grooving the pistons.

The famous engine builder Steve Henderson said many times,
"You can build a 420 hp engine with a fuel problem, or a 400 hp engine that will run on junk".
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 02-11-2007, 09:49 PM
firestone's Avatar
http://teamrfc.gospelcom.net
 
Last photo:
Join Date: Nov 2003
Location: Fenton MI
Age: 32
Posts: 1,743
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
i had an aluminum headed 383 with 11:1 with a 236 242 @.050 .520 lift hyd roller cam. It ran fine on 92 octane. It had 64cc heads with flat top JE pistons.

Adam
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 02-11-2007, 11:00 PM
Registered User
 
Join Date: Apr 2006
Location: Redondo beach ,CA
Age: 34
Posts: 335
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
im running hyperutectic Flat tops,with Gapless rings.So im a little confused because everyone is going back and forth.Will it run on pump gas?I am rejetting the carb and recurving the distributor at the local shop for this application.If my cr is too high what should I shoot for?
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 02-11-2007, 11:25 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,310
Wiki Edits: 326

Thanks: 837
Thanked 1,151 Times in 950 Posts
In my experience, the motor will run on pump gas up to 11.0:1 with iron heads if you run a tight squish (0.035" to 0.040"), leaning to the tight side of that variance, jet the carb properly and limit ignition advance to 35-36 degrees total, in by 3,000. Of course the cam has to be matched up properly also with the correct intake closing point to limit cylinder pressure. I like to use KB's or other manufacturer's pistons that are made like KB's. Stock-type Chevy pistons are the worst because of the way the crown is recessed with a very narrow ring around the perimeter. It just doesn't make a real nice match with the underside of the head for a good squish. Even with a dished piston where you want less compression, the KB's have the dish offset to the chamber side so that you have a nice flat area to mate up with the underside of the head.

Last edited by techinspector1; 02-11-2007 at 11:30 PM.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 02-11-2007, 11:39 PM
Registered User
 
Join Date: Apr 2006
Location: Redondo beach ,CA
Age: 34
Posts: 335
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
sounds good,these heads have the heart shape chambers like vortecs I didnt know if it makes a difference I've heard that aluminum heads will run more compression,I believe these pistons are kb's.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 02-12-2007, 07:45 AM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 66
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
bonzi, your buddy wants a street car, go back to the comp cam charts and look at the 1500-3000rpms hp and tq and Hg values on all the cams
from their charts examples:
a 274 grind cam will be 11Hg at idle and make 225hp at 3,000
a 250 grind cam will be 19Hg at idle and make 225hp at 3,000

each full compression point can add "upto" 4% to the "peak rpms" hp for any motor size....doesn't usually add much to low rpm's performance, your adding 4% to a low hp and tq number at 1500- 3,000rpms
from the chart:
if their build had been 10.25, would be max 234fwhp at 3,000....6 additional fwhp doesn't do much on a 3,000lb car

for the street, max 10.0 so you can run more timing at low rpm's

Last edited by red65mustang; 02-12-2007 at 08:27 AM.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 02-12-2007, 05:40 PM
Member
 
Join Date: Nov 2004
Location: PA
Age: 72
Posts: 367
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Quote:
Originally Posted by red65mustang
go to the comp cams site
click on "charts and graphs" under Technical
click on dyno results
pick a cam chart shown
click on the chart

complete motor build spec's given, in your example, 274H cam idle vac=11Hg at 800rpms, carbs want 15Hg around town

you build a motor around the cam for the results you want
Those charts are for 356 CI engines. You should have more vacuum when used on a 383. My 383, with that cam, has about 13" @ 800-900RPM.

BTW: +/- 10.3 CR and aluminum heads and runs on 89 octane.
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 02-12-2007, 07:20 PM
Registered User
 
Join Date: Nov 2004
Location: California
Age: 68
Posts: 831
Wiki Edits: 0

Thanks: 28
Thanked 23 Times in 20 Posts
Remember. This guy is in Bakersfield. High summer temperatures and 91 octane gas. Not 93. At least not at the neighborhood Shell. Not saying it won't work, but there isn't a lot of margin at 10.7. You might want to take a close look at what's happening with your dynamic compression. With that big of a cam, you may get away with it. The cam seems a little large for a street 383 (to my taste, yours may vary) but going to a smaller cam might be the compression/fuel death knell. I'd like to hear a little more on the cam timing issues, dynamic compression, and probablilities of detonation from Xntrik. . . . . . . Perhaps using some camshaft timing tricks could help? ? ? ? ?

Pat
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 02-12-2007, 08:34 PM
Registered User
 
Join Date: Apr 2006
Location: Redondo beach ,CA
Age: 34
Posts: 335
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
So I might have to lower the compression a little?Is this really too much cam?It says 1800-up but in a 383 thats about 1500-up?
yeah he only put the compression so high because he wanted sound,and power.I told him in advance that compression might be a little high,He did'nt like the last motor I built for him.He said it was'nt mean enough.It was a 383 9.7:1,with a set of reworked vortec heads,268H xe cam and a rpm intake,I had put a 600cfm edelbrock on it.I honestly didnt see what was so bad with that setup it sounded great.But he said he wanted more sound.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 02-12-2007, 09:28 PM
techinspector1's Avatar
Senior Curmudgeon
 
Last wiki edit: DynoSim combinations Last photo:
Join Date: Oct 2005
Location: Hemet, California, USA
Age: 72
Posts: 13,310
Wiki Edits: 326

Thanks: 837
Thanked 1,151 Times in 950 Posts
If I were building this motor, I'd be looking at a cam something like this. Valve lift with 1.6 rockers would be 0.496". It's ground on a 106 LDA.
http://www.cranecams.com/?show=brows...tType=camshaft
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 02-13-2007, 07:25 AM
CNC BLOCKS NE's Avatar
CNC Blocks Northeast
 
Last photo:
Join Date: Sep 2006
Location: NORTHEAST
Age: 54
Posts: 1,491
Wiki Edits: 0

Thanks: 1
Thanked 21 Times in 21 Posts
Quote:
Originally Posted by techinspector1
If I were building this motor, I'd be looking at a cam something like this. Valve lift with 1.6 rockers would be 0.496". It's ground on a 106 LDA.
http://www.cranecams.com/?show=brows...tType=camshaft
What the heck is 106 LDA.
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 Stoker vs 383 Chrysler Jag Daddy Engine 100 08-14-2008 12:48 PM
Supercharging and fuel injecting a 383 Chevy Noesis Engine 11 09-21-2007 06:51 AM
383 0r 406??? Zubair Engine 60 10-14-2005 08:53 PM
What makes a 383 so much more expensive? Chevy21 Engine 12 09-30-2004 09:55 PM
383 Setup, need advice william27103 Engine 7 06-07-2004 10:57 PM


All times are GMT -6. The time now is 09:00 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.