Building a Cheapy drag motor - Page 2 - 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
  #16 (permalink)  
Old 07-12-2008, 02:46 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,732
Wiki Edits: 0

Thanks: 3
Thanked 346 Times in 343 Posts
Quote:
Originally Posted by Opti
I will not run cast or hyper pistons.
The last motor I ran took me over 10 years to finally give up the ghost from pure abuse. Made the mistake of trying to run 12.65:1 cr on pump gas without backing off the timing. Purely my dumb fault.
One piston was replaced and the motor was freshened and put right back into service.

Cheapy cast H345NP pistons.
The only time I've ever seen a cast piston fail (or a forged piston fail for that mator) is from pure abuse like using the wrong fuel.
Even on nitrous. Have run many cast piston motors on the spray with no problems. You do need to open up the ring end gaps thou. Most people have a lot of trouble getting their head around that. Thats why they have problems.

TRW/speedpro L2256F-60 forged pistons are you next best cheap step up if it will make you sleep better at night.

    Advertisement

Last edited by F-BIRD'88; 07-12-2008 at 02:52 PM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17 (permalink)  
Old 07-12-2008, 02:51 PM
Registered User
 
Join Date: Jul 2008
Location: TX
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
I run around with mostly Late model guys since I own an LT1, but I have seen first hand Quite a FEW of them fail especially the hyper ones. Most of the forged ones I seen fail are from major tuning issues on big boost or spray cars.

Its more justa piece of mind thing. I mean if I throw the vortecs on a hate them no biggie just replace them when I have money, If I dont liek the pistons then its a ***** to replace them.

On a side note I got my dad on board. Ever since I sold my 69 Firebird (43K miles, bought it as an investment) hes wanted another project to work with me on and I think me and him can have some fun on a junkyard build liek this.
Reply With Quote Quick reply to this message
  #18 (permalink)  
Old 07-12-2008, 03:01 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,732
Wiki Edits: 0

Thanks: 3
Thanked 346 Times in 343 Posts
Althou the vortecs certainly work very well (I run a ported big valve set on my 406SBC)
The summit heads I recomended will make more power out of the box in this motor and have room to grow. The valve train is ready to rock for the Isky Cam
If you want forged pistons, just substitute/+add the L2256F-60 pistons for the ones in the summit kit.
You'll find another use for the left over pistons.
You find this motor gets the job done for you the first time, either way.

The hyper pistions in your friends LT-1 motors are not the same as the KB/Summit or Federal Mogul stuff. They are fitted much tighter and do not have the same heat treat. They are not a performance piston and are not for any nitrous use. Do not compare.

If you set the pistons up correctly with generous ring end gaps, set the nitrous fuel system up for proper fuel delivery and use 100% race gas when spraying and don;t get carried way you'll be fine with any piston.
You're going to find that any n2O shot over 150-180 hp get $$too expensive over time$$ any ways.
Keep the whole thing reasonable and tune it correctly and it will not give you issues.

Last edited by F-BIRD'88; 07-12-2008 at 03:07 PM.
Reply With Quote Quick reply to this message
  #19 (permalink)  
Old 07-12-2008, 03:07 PM
Registered User
 
Join Date: Jul 2008
Location: TX
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Ive only seen two stock Lt1 pistons fail. Both were on decent size shots fail (200 an 180) the others were on cheaply build 383 and 388 where they skimped on pistons (hyper) and thought they could still run big shots.

Id still prefer to run forged stuff but I will reconsider some of the hyper sutff.
Reply With Quote Quick reply to this message
  #20 (permalink)  
Old 07-12-2008, 03:31 PM
F-BIRD'88's Avatar
Yada Yada Yada
 
Last photo:
Join Date: Oct 2005
Location: Ontario, Canada
Posts: 9,732
Wiki Edits: 0

Thanks: 3
Thanked 346 Times in 343 Posts
Quote:
Originally Posted by Chevrolet4x4s
The Speedway kits look real good too.
Reply With Quote Quick reply to this message
  #21 (permalink)  
Old 07-12-2008, 03:52 PM
Blazin72's Avatar
You got a leaky spark tube...
 
Last wiki edit: Rearend removal
Last journal entry: General Lee
Last photo:
Join Date: Jul 2005
Location: Union, WA
Age: 32
Posts: 2,868
Wiki Edits: 19

Thanks: 0
Thanked 2 Times in 2 Posts
Opti, want to keep costs down? Build the 383 with very good low-mid range torque and run a slightly higher gear. Lower rpm keeps wear and tear down and you won't have to be as concerned with the expensive high strength parts that is needed for higher rpm engines. Building an engine that doesn't have much torque down low and combining that with lower rear gears means you're going to have to spin the engine higher. Higher rpms means more stress on engine parts which, in turn, means you're going to be spending more money on expensive parts to keep from grenading things.

Just something to think about.
Reply With Quote Quick reply to this message
  #22 (permalink)  
Old 07-12-2008, 04:23 PM
Registered User
 
Join Date: Jul 2008
Location: TX
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Blazin:

That could make a good fun street engine but it would absolutely blow for a strip only motor.
Reply With Quote Quick reply to this message
  #23 (permalink)  
Old 07-12-2008, 04:40 PM
Blazin72's Avatar
You got a leaky spark tube...
 
Last wiki edit: Rearend removal
Last journal entry: General Lee
Last photo:
Join Date: Jul 2005
Location: Union, WA
Age: 32
Posts: 2,868
Wiki Edits: 19

Thanks: 0
Thanked 2 Times in 2 Posts
Just trying to give you ideas to help save a little money. You're looking for a "cheapy" engine right? A high rpm engine that is built to last a long time is not going to be cheap...
Reply With Quote Quick reply to this message
  #24 (permalink)  
Old 07-12-2008, 04:49 PM
Registered User
 
Join Date: Jul 2008
Location: TX
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It doesnt really require exotic or all that expenisve parts, just a little more in key areas.

I helped build a cammed Lt1 to last at 7K it pretty mcuh just involved better bearings in the bottom end, and ARP rod bolts. Thing is still chuggin 30K miles later.
Reply With Quote Quick reply to this message
  #25 (permalink)  
Old 07-12-2008, 06:57 PM
Registered User
 
Join Date: Jul 2008
Location: TX
Posts: 21
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Hey Guys Ive been lookin and lookin at the vortecs and one thing bothers me.

I know these heads were designed for truck motors (ie lots of torque) and damn near every dyno I seem of them, they do Amazing down low but not so well up top.

I could really care less how much torque this motor makes as long as it makes good hp, do you guys think there could be a better choice for around the same price for heads for a top end motor?

The vortecs Im lookign at are the Patriot versions. The already come with screw in studs, and bigger valves.

Or do you think that most peopls powerbands is due to their manifold and cam choice, I know those playa big part but do yall think that isky cam with the patriot vortecs will make a good top end motor?
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


Similar Threads
Thread Thread Starter Forum Replies Last Post
engine selection rphillips Engine 44 07-23-2007 04:09 PM
Building a 671 SBC Motor TheAmericanDream Hotrodding Basics 5 06-13-2007 08:50 PM
emision loopholes digitalfrek Engine 13 03-13-2006 06:25 PM
New to hotrodding, building a motor? spyderdude Hotrodding Basics 26 05-29-2005 10:09 AM
new to da motor building game sidtrippinghrd Engine 3 08-25-2002 01:21 PM


All times are GMT -6. The time now is 07:34 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.