355ci upgrade. Nothing wrong...just want more power..OF COURSE! - 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 01-27-2009, 09:58 PM
wickster's Avatar
Member
 
Last photo:
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
355ci upgrade. Nothing wrong...just want more power..OF COURSE!

Looking for some input....although the engine runs great...there is just not enough oomph. Runs and drives great...but I really want to be able to smoke the tires off the line.

Was thinking a cam upgrade (XE274 or XE284) and or a steeper rear-gear. Any advice? Or am I missing something>

350 SBC, bored .030
Stock Crank
Spped pro Flat Top (~9.5:1)
Stock Connecting Rods
Edelbrock Performer RPM Heads (#60899), 64cc, Straight Plugs
Comp Cams XE268H Camshaft (224/230@.050, .477/.480)
Performer EPS Manifold
Edelbrock Carb, 600cfm
Mallory HEI
1 5/8" Heddmen Headers
3.55 Rear with TH2004R Bowtie overdrive Tranny

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 01-27-2009, 10:08 PM
Regal Beagle's Avatar
Registered User
 
Join Date: Apr 2008
Location: Calgary, Alberta
Posts: 199
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
What kind of car is that mill in? I have almost identical set up except for the cam. I have a Comp XR270HR .495 intake .502 exhaust.
Mine hauls my 85 Regal at 3500 plus lbs with no issues at all.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 01-27-2009, 10:11 PM
wickster's Avatar
Member
 
Last photo:
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
1965 Chevelle Convertible...about the same weight.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 01-28-2009, 07:19 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
seems like you are using a stock converter? You should be able to spin the tires easily with that setup. A bigger cam will make it worst.

get a 2500 to 2800 stall.

gears will help, 3.55 isn't bad but a 3.73 would be ideal for your cam.


what does the ignition timing setup look like? (initial, total, how much vacuum advance)??

A RPM intake would be better for your setup

I would also put that carb were it belongs, in the trash. Get a 705 holley.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 01-28-2009, 07:33 AM
Big Mouse's Avatar
Stroked Z28
 
Last photo:
Join Date: Oct 2006
Location: Escaping the rat race...
Posts: 230
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I agree with the previous poster.

In my humble opinion, you are a bit mismatched in your combo. Those heads can flow pretty well up top, but your cam & intake are restricting you. A cam along the lines of the XE274 (or similar) along with an RPM air gap intake may be a better choice. Your gears are probably fine, but you need enough stall. You'll want more carb if you let those heads flow.

I have a similar build with a 383, rpm heads, rpm intake, XE274h cam, and 3.73's + a manual OD trans. I, too, am pretty pleased with the combo.

As far as your carb goes, for persepctive I'm switching from a qjet (750 cfm vacuum secondaries) to a blueprinted 750 cfm double pumper with mech secondaries.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 01-28-2009, 07:50 AM
wickster's Avatar
Member
 
Last photo:
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
When I bought the tranny from Bowtie overdrives, they supplied a 2400 stall ("High Performance Stree") converter with the package. It has always seemed like it didn't stall as high as I expected...but thats just feel. Once I get the revs up it pulls good...

Too many variables: cam, intake, carb, converter, rear gears but sounds like the converter may be a good start?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 01-28-2009, 07:59 AM
usnkricket's Avatar
Registered User
 
Join Date: Jun 2004
Location: S Coffeyville,Oklahoma
Age: 60
Posts: 8
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Carb

I like your set up, but you can add a little more kick to your step by doing some changes to the metering rods and jets for that elbrock AFB. Get with your parts dealer for number and stats. Have you had it on a Dyno?
I don't think that changeing to a holley will get that much more.
Good Luck
USN
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 01-28-2009, 08:05 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
what is your ignition timing (initial, total, and vacuum advance).

A poor tune can kill 100hp.

edelbrock carbs stink. especially a 600 on a performance engine.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 01-28-2009, 08:15 AM
wickster's Avatar
Member
 
Last photo:
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
12 degrees initial, 23-24 with Vacuum advance hooked up, and 34 degrees total. 13 in vaccuum
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 01-28-2009, 08:44 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
set it at 18 initial (without the vacuum advance), then plug the vacuum advance into the the manifold vacuum. total mechanical will be a little high (40) but that will be ok. more timing will make it much more responsive off the line.

could run 20 to 24 degrees of initial timing but you will need to reduce the amount of advance in the distributor.

you have a modified engine, so you also need to modify the fuel and timing.

what timing chain are you using?
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 01-28-2009, 08:53 AM
wickster's Avatar
Member
 
Last photo:
Join Date: Mar 2004
Location: Calgary, Alberta, Canada
Posts: 139
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Timing Chain
Cloyes True Roller (9-1100)
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 01-28-2009, 09:04 AM
Member
 
Last photo:
Join Date: Dec 2004
Location: San Antonio, Texas
Age: 50
Posts: 4,023
Wiki Edits: 0

Thanks: 0
Thanked 23 Times in 23 Posts
do you have the cam installed straight up (no advance or retard)?

your mallory hei should an adjustable total mechanical advance. set it to 7.5 degrees (15 degrees crank) and set the timing at 20 initial which would make 35 total mechanical (20 +15 =35). then adjust the vacuum advance to 15 degrees so the engine will run at 50 degrees going down the highway and 35 degrees at idle.

Then adjust your carb to give more gas on the accelerator pump.

should get the tires to spin with that set up.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 01-28-2009, 09:08 AM
How fast is fast enough?
 
Last photo:
Join Date: Jun 2005
Location: St. Louis, MO
Age: 29
Posts: 9,193
Wiki Edits: 0

Thanks: 17
Thanked 338 Times in 318 Posts
a little higher stall and a steeper gear will amek it feel like you have a lot more power on tap. A cam and intake would complement that well, but you wouldn't feel it until you reached the top end of your power band. a 3,000 stall and a 4.56 gear would make it feel like a new animal. And with your OD its not that steep of a gear.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 01-28-2009, 04:38 PM
Member
 
Last photo:
Join Date: Nov 2004
Location: Lakeland FL
Age: 65
Posts: 4,110
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
wickster,
454 is correct,,,you timing is way off for the motor combo...
(costing you 30Hp+)

"if" the base is 12, and the all in timing "is" 34,,,then there is the totally typical HEI 22*'s of centrifugal (not 24-26 common in a pickup truck dist and 2*'s is a big difference)

safer to take small steps:
recommended base for your cam is 14-16 base,,,(that's 36-38 total WOT with the 22 cent)...
test drive that WOT and with vac adv plugged in at part throttle on a steep hill for ping...

your car should be able to handle the timing all in at about 2600-2800 due to the 2500 stall/3.55 gears so next try a lighter centrifugal springs change...
do another test drive

(at about this point you will likely need to change atleast the carb rods to thinner to go further)

for a street tune up,,,I'd call it done....
(vac advance adjusted for approx 50* all in timing total)
I like to stay on the "safer" conservative side for no ping...

here's a good timing article:

http://www.gnetworks.com/v4files/bar...withimages.pdf
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 01-28-2009, 04:47 PM
Registered User
 
Join Date: Dec 2008
Location: Dover Delaware
Posts: 187
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Personally I would use around a 4.30 gear with a 3,500-4,000 stall lockup converter. I like the XE 274 cam with the Performer RPM intake. That would be a nice way to launch and still keep a decent cruise rpm.
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
electronic power steering trident Suspension - Brakes - Steering 5 07-28-2006 09:36 PM
How Does This Stuff Work? docvette Electrical 3 06-18-2006 03:00 AM
Upgrade to power windows Moon Interior 4 06-09-2006 04:54 AM
Advise on Porta Power choice meanroy Body - Exterior 7 06-23-2004 11:38 PM
Unusual Power Steering Conversion Lars Sorensen Suspension - Brakes - Steering 17 05-25-2004 02:05 PM


All times are GMT -6. The time now is 12:31 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.