383 stroker chevy camshaft - Page 3 - 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
  #31 (permalink)  
Old 05-07-2013, 04:58 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Yes Gumvbo, I want to retain EFI system, as I will retain the LPG sytem, so I need an intake manifold that support 8 injectors.(other 8 LPG are not difficult to install)
I'm searching it and I think that it is real possible to find but if I'm wrong I will modified an existing intake manifold with correct flow for the combo.
Waiting for suggestion by experts!!
Thanks

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #32 (permalink)  
Old 05-07-2013, 05:34 AM
Gumvbo's Avatar
Registered User
 
Join Date: May 2013
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
lollo, I am not sure your existing injection system is a direct bolt-on onto a pre-vortec manifold, independently of the LPG.
Let's see if we get some answers to this question.

As far as Multiport LPG injection goes, I have heard of the 8 injectors all "crowned" around the throttle body, in order to fit a Sequential Multiport LPG system onto a TBI motor.
That might be an option in case you need to switch to a TBI.
But you will need to make a research on the subject with the help of a specialist.
Reply With Quote Quick reply to this message
  #33 (permalink)  
Old 05-07-2013, 05:55 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Sure, I have to wait!
The injectors spyder is inside the intake, and the intake is made by two pieces, aluminium down and plastic up. The aluminium part is cooled.
Is not so easy!!
Attached Thumbnails
Click image for larger version

Name:	9857vortecturninginjectorlegs.jpg
Views:	214
Size:	137.9 KB
ID:	73813  
Reply With Quote Quick reply to this message
  #34 (permalink)  
Old 05-07-2013, 09:26 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 991
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 81 Posts
The stock CSFI(Central Sequential Fuel Injection) came stock on the 1996-1999 GMT400 trucks/SUV's and from 1996-2002 in the vans.

The stock CSFI poppets flow at 23.4 lb/hr@63 psi of fuel pressure. This will support about 330rwhp or about 390-400hp at the crank at the crank.

Being a 1/2 ton your exhaust should look lkike the smaller of these 2 exhausts. 1 is from a 1/2 ton, 1 is from a 3/4 ton, both the same years and are Vortec 350 exhausts.




Here is a Magnaflow replacement with dual cats and mandrel bent tube, much better than stock.


These are Hedman Husler header for the Vortec 350


2462 hkr Competition series Hooker headers are 1 5/8 primaries and 2 1/2" collectors painted black
2562 1hkr same headers but ceramic coated
2462 2hkr same headers but stainless steel contruction I personally used teh ceramic coated 2642 1hkr headers on my 97.

Hooker also makies the 2806 hkr SUPER COMPETITION series with 1 3/4" primaries and 3" collectors with longer equal length primaries painted black
2806 1hkr are ceramic coated
The super comps are about twice the cost of the Comps. All teh Hooker headers will require you to weld in the EGR bung that feeds teh EGR system loctaed on teh drivers side exhaust manifold. There is a hose that runs from the drivers manifold to the drivers sside front of the intake manifold.

Here is the stock CSFI spider above the GM retrofit MPFI replacement spider. Both flow the same 23.4 lb/hr at 63psi of fuel pressure the stock regulators are set at.


Ramjet 350 intake, works with Vortec heads


This is teh Mercruiser marine intake manifold that I use on my reg can shortbox Vortec 350 truck MArineintake left, stock CSFIO intake right




LPG has a 102-108 RON octane ratings
Stoich for propane is 15,67:1 by mass, and natural gas is 17.2:1 by mass.

I am knowledgeable about the CSFI Vortec L31 96-99 GMT400 truck systems. I laso calibrate my own PCM's(computers) for these as well, so ask away. Others here like those who have been helping you can build a better engine than I can.

peace
Hog
Reply With Quote Quick reply to this message
  #35 (permalink)  
Old 05-07-2013, 09:46 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Thank you Hog.
I've found Holley parts that is possible that fits EQ heads.
Holley Performance Products EFI Intake Manifold*9901-101-1

Holley Performance Products Fuel Rail Kit*9900-172

The magnaflow dual cats are replacement for stock or shorty headers, maybe for tri-y.
If I will use magnaflow dual cats and long tube headers 1 5/8 I need to modified the pipes.
If I will do it, may I use an X or H equalizer before the cats or after the cats?

hahahaha I've start the thread for camshaft and now we are talking about all the combo parts.........great!!!!
Reply With Quote Quick reply to this message
  #36 (permalink)  
Old 05-07-2013, 10:08 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 991
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 81 Posts
That intake will work, but your stock intake will work as well.
If you are going to use a differnt intake manifold and wire in the injectors, here is a schematic, the pink wires are switched grounds. These coloured wires match the GM colur codes for the wires that you will find on teh stock injector wire harness on your truck.


A set of shorty headers will bolt directly to the Magnaflow dual cat replacement. Mid lengths would require cutting and welding, as would longtube headers.

the problem about h or X pipes on these Vortec vehicles is that it is almost impossible to get the amount of pipe in front of the x or H pipe exactly the same on both sides. This is because of the way that the stock fuel tank forces all of the exhaust over to the passenger side of the truck.

This is the cat forwqard exhaust fromMagnaflow for a 3/4 ton truck.


And the back section


Same parts but from Walker



Walker back section



As you can see the pipes and cats are larger for more flow. MAybe not needed, but just wanted to show you.

It should be noted that SOME Tahoes used exhaust that had the stock cats on the passenger and drivers side of the vehicle. The fuel tank isnt up front and in the way like in the trucks. Maybe you can run your exhaust straightback?

peace
Hog
Reply With Quote Quick reply to this message
  #37 (permalink)  
Old 05-07-2013, 10:28 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Thank you Hog!
The intake manifold and injectors will be different because the head are not vortec as OEM.
I will use EQ heads 76cc !
What I'm looking for is an intake manifold for pre-vortec heads that support 8 EFI injectors.
Reply With Quote Quick reply to this message
  #38 (permalink)  
Old 05-07-2013, 11:20 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 991
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 81 Posts
Quote:
Originally Posted by lollo View Post
Thank you Hog!
The intake manifold and injectors will be different because the head are not vortec as OEM.
I will use EQ heads 76cc !
What I'm looking for is an intake manifold for pre-vortec heads that support 8 EFI injectors.
Gotcha, you could look into a TPI setup then, if youa re after mid rpm torque, its tough to beat the good old TPI intakes. And they look good too.




peace
Hog
Reply With Quote Quick reply to this message
  #39 (permalink)  
Old 05-08-2013, 04:18 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Hi Hog,
I need to find something that fit The EQ heads and is from idle to 5000 rpm.
The engine will be an high low end torque.
The truck is lifted 3 inch body, so I have more cleareance to the hood.
Thanks a lot!
Reply With Quote Quick reply to this message
  #40 (permalink)  
Old 05-08-2013, 05:03 AM
Gumvbo's Avatar
Registered User
 
Join Date: May 2013
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
@Hog, the motor that Techinspector built for lollo is a stump puller - 480lb/ft@2000 rpm (!!) and max power 300hp@3000 or something - see page 1.
Not sure a TPI intake will fit those figures.

100% agree TPI's look great though....
Reply With Quote Quick reply to this message
  #41 (permalink)  
Old 05-08-2013, 09:14 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 991
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 81 Posts
Quote:
Originally Posted by Gumvbo View Post
@Hog, the motor that Techinspector built for lollo is a stump puller - 480lb/ft@2000 rpm (!!) and max power 300hp@3000 or something - see page 1.
Not sure a TPI intake will fit those figures.

100% agree TPI's look great though....
RPM....HP....TQ
1000....80....421
1500...134...468
2000...184...483
2500...223...469
3000...261...458
3500...287...431
4000...300...394
4500...298...348
5000...276...290

Peak volumetric efficiency 82.1% @3000 rpm's
Peak BMEP 190.3 lbs @2000 rpm's


That is a simulation that did indeed use a 500cfm TPI setup.
TPI setups use helmholtz resonance tuning to literally cram air into the heads at a specific rpm.
The stock TPI intakes were noted for their mid rpm torque and lack of upper rpm breathing compared to other intake manifolds.
Stock L98's were rated at 250hp@400rpm/340lb/ft@3200rpm.
IMO I dont think that there would be a better PFI intake manifold for this engine.
Unless you went with a TBI induction. The TBI L05 350 in the 95 1/2 ton truck which were rated at 210hp@3600rpm/300lb/ft@2800rpm or 190hp@4000/rpm/300lb/ft@2400rpm.
But I wouldnt suggest a TBI setup over a TPI setup.

peace
Hog
Reply With Quote Quick reply to this message
  #42 (permalink)  
Old 05-08-2013, 09:53 AM
lollo's Avatar
Registered User
 
Last photo:
Join Date: May 2013
Location: Milano
Posts: 32
Wiki Edits: 0

Thanks: 2
Thanked 0 Times in 0 Posts
Hi Hog, thank you, your TPI intake looks great!
I don't Know which kind of intake have used Techinspector1 in the simulation. I have to ask him.
I,ve wrote to Rogers performance, that sells me the EQ Heads, and he suggest me the XT pro-flow Edelbrock.
Attached Thumbnails
Click image for larger version

Name:	350-71373.jpg
Views:	61
Size:	12.1 KB
ID:	73853  
Reply With Quote Quick reply to this message
  #43 (permalink)  
Old 05-08-2013, 10:11 AM
vinniekq2's Avatar
Registered User
 
Join Date: Jun 2012
Location: BC,Canada
Age: 56
Posts: 8,644
Wiki Edits: 0

Thanks: 364
Thanked 858 Times in 820 Posts
lolo,read post # 11
Reply With Quote Quick reply to this message
The Following User Says Thank You to vinniekq2 For This Useful Post:
lollo (05-08-2013)
  #44 (permalink)  
Old 05-08-2013, 10:14 AM
Registered User
 
Last photo:
Join Date: Nov 2006
Location: Woodstock
Posts: 991
Wiki Edits: 0

Thanks: 2
Thanked 89 Times in 81 Posts
Quote:
Originally Posted by lollo View Post
Hi Hog, thank you, your TPI intake looks great!
I don't Know which kind of intake have used Techinspector1 in the simulation. I have to ask him.
I,ve wrote to Rogers performance, that sells me the EQ Heads, and he suggest me the XT pro-flow Edelbrock.
If you look at page #1 on TechInspectors post, it literally says "500 cubic feet per minute TPI intake manifold was used"

Here is a copy of said passage with the TPI part highlighted:
This Sim was run with a 500 CFM Tuned Port Injection setup and 1 5/8" long tube headers through mufflers. Suggest installation of "X" or "H" pipe before the mufflers to smooth exhaust note and increase fuel mileage slightly.

Here's how the hp and tq worked out.....

RPM....HP....TQ
1000....80....421
1500...134...468
2000...184...483
2500...223...469
3000...261...458
3500...287...431
4000...300...394
4500...298...348
5000...276...290

Peak volumetric efficiency 82.1% @3000 rpm's
Peak BMEP 190.3 lbs @2000 rpm's
XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX XXXXXXX

The intake you have shown is a great intake, it woudl be suited for higher rpms though, far higher than a 2000rpm torque peak.
That intake is available as part of a complete kit that includes and ECM to control it. Not sure if it would control an electronic transmission though.
But its a nice setup for sure.

peace
Hog
Reply With Quote Quick reply to this message
The Following User Says Thank You to Hogg For This Useful Post:
lollo (05-08-2013)
  #45 (permalink)  
Old 05-08-2013, 10:52 AM
Gumvbo's Avatar
Registered User
 
Join Date: May 2013
Posts: 6
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Lollo if you think you can modify the intake manifold to accept the LPG injectors then forget the Edelbrock and go with the TPI.....

@Hog, how about the ECM to run the TPI ? Will the stock ECM do the job or an aftermarket unit is required ?
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
selecting a camshaft for a street 383 chevy?? demarques_191 Hotrodding Basics 2 05-03-2013 07:51 PM
Which Camshaft is better for the Street on a chevy 383? demarques_191 Engine 14 02-07-2013 07:12 AM
Break-in oil for a ROLLER camshaft equipped 383 stroker? 383SBC Engine 9 02-16-2011 03:09 PM
?'s on a 383 stroker chevy... gofastz Engine 3 11-09-2010 05:58 PM
383 stroker chevy brainsboy Engine 2 04-09-2004 10:10 AM


All times are GMT -6. The time now is 04:24 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.