running dual engines - Page 4 - 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> Hotrodding Basics
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #46 (permalink)  
Old 02-16-2011, 02:42 AM
OneMoreTime's Avatar
Hotrodders.com moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: Yard Dog pic
Last photo:
Join Date: Jul 2004
Location: Washington State
Age: 69
Posts: 7,323
Wiki Edits: 3

Thanks: 46
Thanked 146 Times in 138 Posts
Actually it works fairly well and the sync'ing of the 2 engines is not a big deal as all one needs to do is index the cranks together and make sure you are running the same timing on both of them..the throttle linkage is made with the small heim joints and the carbs or injectors are set up similar to a dual four or tri-power setup..the main issue back in the day was tires as we did not have the kind of tires we have today.

Weight is also a factor as the single engine guys has less of that to deal with and of course with the modern engine tech some fantastic HP is available..If I were to build for the tractor pulls dual or multiple engines are the way to go as that is a torque game to move those loads that they pull..

Sam

    Advertisement
__________________
I have tried most all of it and now do what is known to work..
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #47 (permalink)  
Old 02-16-2011, 09:39 PM
bentwings's Avatar
bentwings
 
Last photo:
Join Date: May 2002
Location: St.Paul, Minn
Age: 72
Posts: 1,796
Wiki Edits: 0

Thanks: 0
Thanked 16 Times in 15 Posts
With the advent of the coupler rather than the chain drive connecting the engines was not a problem. Small blocks still had a weak crank snout however.
The Freight Train with 2 small block was very consistant and very popular. They may have had either welded or billit cranks with BBC sized snouts. The 392's however were starting to take over as the tire tech caught up and larger tires were available the last year that twins were run. The 2 speed non overdrive trans was also available.

The reason that the twins began to dominate the Top Gas was that we weighed about 1450 rolling. The twins simply added about 700 pouns for the motor and no significant additional chassis weight. So the power to weight ratio immediately went to the twins. Add bigger tires and a transmission and us single guys simply got left in the dust. Granted there were a very few singles that managed to stay one mistake behind but on a dead even start money went to the twin.

Now even the twins ran hard so they occasionaly burned pistons and their reliability was quite a bit lower so they sometimes got left holding the bag with only 1 motor. We never missed a chance to eat their lunch on those days. haha The twins had the motors set way back so when running on only one they were at a disadvantage due to the cg position and too large of tire. The clutch was adjustable but not easily for this much power change.
Reply With Quote Quick reply to this message
  #48 (permalink)  
Old 02-19-2011, 09:05 AM
jalopy45's Avatar
Member
 
Last photo:
Join Date: Jan 2002
Location: Christmas Valley OR
Age: 66
Posts: 547
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Here's what we use on our twin dragster ,
__________________
Rods Built By Owners(RBBO)club member
wrecking yard archeologist
Reply With Quote Quick reply to this message
  #49 (permalink)  
Old 02-19-2011, 09:22 AM
jalopy45's Avatar
Member
 
Last photo:
Join Date: Jan 2002
Location: Christmas Valley OR
Age: 66
Posts: 547
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
That is a coupler used on trailer mounted industrial waste pumps and allows indexing every 22.5 degrees The rail is a twin engine 4 cylinder rail and the timing is set so 45 degrees after cylinder one fires on the front engine cylinder 2 fires on number 2 engine and allows me to use one distributor to fire both engines., ,
__________________
Rods Built By Owners(RBBO)club member
wrecking yard archeologist
Reply With Quote Quick reply to this message
  #50 (permalink)  
Old 02-19-2011, 09:28 AM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by jalopy45
That is a coupler used on trailer mounted industrial waste pumps and allows indexing every 22.5 degrees The rail is a twin engine 4 cylinder rail and the timing is set so 45 degrees after cylinder one fires on the front engine cylinder 2 fires on number 2 engine and allows me to use one distributor to fire both engines.
VERY cool. The first picture looked really "industrial", almost like it was made by Caterpillar or something, but seeing it from a different prospective changes that perception.

What kind of times and speeds does it run? Does it 60' well?
Reply With Quote Quick reply to this message
  #51 (permalink)  
Old 02-19-2011, 11:13 AM
dinger's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Health and safety in the shop or garage
Last journal entry: 36 Ford painting
Last photo:
Join Date: Jan 2002
Location: Visalia, Ca.
Age: 61
Posts: 2,710
Wiki Edits: 1

Thanks: 102
Thanked 110 Times in 76 Posts
Jalopy, do the number 1 cylinders fire at the same time? I am a bit confused. If they do, is the spark strong enough to fire both cylinders at the same time. That is one interesting set-up, do you ever get to Famoso with the car?
__________________
"When I was younger, I could remember anything, whether it had happened or not." - Mark Twain
Reply With Quote Quick reply to this message
  #52 (permalink)  
Old 02-19-2011, 11:51 AM
jalopy45's Avatar
Member
 
Last photo:
Join Date: Jan 2002
Location: Christmas Valley OR
Age: 66
Posts: 547
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
The front engine fires cylinder one, 45 degrees later the rear engine fires cylinder one and so on down the line, the firing orders on both engines are stock (1-3-4-2) so it works out 1 cylinder fires every 45 degrees (45X8=360), it smooths out the harmonics as well, use this sme method on V8 and you could fire the engines every 22.5 degrees.
__________________
Rods Built By Owners(RBBO)club member
wrecking yard archeologist
Reply With Quote Quick reply to this message
  #53 (permalink)  
Old 02-19-2011, 01:52 PM
bentwings's Avatar
bentwings
 
Last photo:
Join Date: May 2002
Location: St.Paul, Minn
Age: 72
Posts: 1,796
Wiki Edits: 0

Thanks: 0
Thanked 16 Times in 15 Posts
I see you have a ground wire between the block and the head on each motor. Interesting concept. I have that also on my SBC. This has been an off and on again thing for years. It sometimes cures mysterious electrical problems. Sure doesn't hurt.
Reply With Quote Quick reply to this message
  #54 (permalink)  
Old 02-24-2011, 12:08 PM
malc's Avatar
Living At The Speed Of Life
 
Last photo:
Join Date: Jun 2003
Location: Espaņa Right Coast
Posts: 3,260
Wiki Edits: 0

Thanks: 90
Thanked 93 Times in 79 Posts
Saw on the BS Blog and thought itīd be just right for this thread.
Building a Twin Engine Dragster From Scratch
Reply With Quote Quick reply to this message
  #55 (permalink)  
Old 02-25-2011, 11:00 AM
ogre's Avatar
the 'Duracell Project'
 
Last photo:
Join Date: Nov 2009
Location: Motown
Posts: 1,394
Wiki Edits: 0

Thanks: 0
Thanked 102 Times in 91 Posts
very interesting setup jalopy.
2 engines 1 dist.

this post get more interesting all the time..
Reply With Quote Quick reply to this message
  #56 (permalink)  
Old 02-25-2011, 07:07 PM
Member
 
Join Date: Nov 2001
Posts: 447
Wiki Edits: 0

Thanks: 0
Thanked 11 Times in 10 Posts
twin power

Ok, That is serious cool, looks like 153 chevy 4 cylinders but does the SBC valve cover fit these engines? Thats what the covers look like. So the coupler you used is like the coupler between the motor and pump on like a septic tank pumper truck?. This what hot rodding is all about, never gets dull!
Reply With Quote Quick reply to this message
  #57 (permalink)  
Old 02-26-2011, 11:31 AM
jalopy45's Avatar
Member
 
Last photo:
Join Date: Jan 2002
Location: Christmas Valley OR
Age: 66
Posts: 547
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Those are SBC valve covers but attached using adaptors. those industrial connnectors are availale with a miriad of spline combinations.
__________________
Rods Built By Owners(RBBO)club member
wrecking yard archeologist
Reply With Quote Quick reply to this message
  #58 (permalink)  
Old 02-26-2011, 03:59 PM
Jake_Dragon's Avatar
Member
 

Last journal entry: New Carb
Last photo:
Join Date: Jul 2005
Location: Central Florida
Age: 49
Posts: 772
Wiki Edits: 0

Thanks: 2
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by muddbogg
So with that I would like to know about setting up a engine in the front and back of something using caddy or olds like that....Fiero?VW?
Well the Fiero uses a front wheel drive transmission so you could build a car with 2 of them.
I have a SBC 350 bored 60 over and used an adapter plate to mount it to the stock 5 speed.
Reply With Quote Quick reply to this message
  #59 (permalink)  
Old 02-26-2011, 04:12 PM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Quote:
Originally Posted by jalopy45
That is a coupler used on trailer mounted industrial waste pumps and allows indexing every 22.5 degrees The rail is a twin engine 4 cylinder rail and the timing is set so 45 degrees after cylinder one fires on the front engine cylinder 2 fires on number 2 engine and allows me to use one distributor to fire both engines
One would think that coupling two engines like that would create a lot of vibration. How do you dampen that?
Reply With Quote Quick reply to this message
  #60 (permalink)  
Old 02-26-2011, 09:00 PM
jalopy45's Avatar
Member
 
Last photo:
Join Date: Jan 2002
Location: Christmas Valley OR
Age: 66
Posts: 547
Wiki Edits: 0

Thanks: 0
Thanked 3 Times in 3 Posts
Quote:
Originally Posted by sqzbox
One would think that coupling two engines like that would create a lot of vibration. How do you dampen that?
I do use a FluidDamper on each engine but I'm not wholly convinced I needed them. The original engines did not use a vibration damper and with the 2 engines phased the way they are it runs smoother than a single 4 cylinder firing every 90 degrees., ,
__________________
Rods Built By Owners(RBBO)club member
wrecking yard archeologist
Reply With Quote Quick reply to this message

Recent Hotrodding Basics 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
dual engines wayneooo Engine 5 06-26-2010 08:25 AM
Dual Engines Rharms1 Hotrodders' Lounge 30 10-03-2006 12:40 AM
anyone running corvette dual four intake? deathbypontiac Engine 6 12-17-2005 05:55 PM
Any advantage to running oil coolers on street engines? Siggy_Freud Engine 9 04-20-2005 11:22 AM
A question about dual lift profile engines. dmc12mk3 Engine 8 06-16-2004 10:31 PM


All times are GMT -6. The time now is 08:53 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.