ForumsBasic TrainingOnline Maintenance ManualsThe M715 Zone Vin RegistryVPW's M715 Parts ListGalleriesLinks

Go Back   M715 Zone > General Tech > Open Discussion

Open Discussion Open Discussion for all M715 series trucks

Reply
 
Thread Tools Display Modes
  #1  
Old June 18th, 2018, 12:25 PM
teberhard teberhard is offline
Basic Trainee
 
Join Date: Dec 2016
Location: Boone, NC
Posts: 36
teberhard is a Soldier
Default Giving up on the tornado

I just can't get this thing running right. Starts great and seems to run well but doesn't have much power. I rebuilt the carb first and got her running. Someone before me hacked the military spark plug wires to splice civy wires and plugs. I did the best I could to rewire it but I think the distributor, wiring, and coil are suspect. I just don't know if I want to spend any more time or money on this engine. I adjusted the valves and compression is great but I think this engine will need someone more familiar to get her running right.

From what I read the SBC is the easiest swap. Is that correct? What are the pitfalls that I should consider before embarking on the swap?
Reply With Quote
  #2  
Old June 18th, 2018, 12:43 PM
68kaiser 68kaiser is offline
Private
 
Join Date: Mar 2012
Location: Stonyford CA.
Posts: 102
68kaiser is a Soldier
Default

I put a 454 in mine first.. cooling was my issue with the factory radiator.. then it was fuel milage, 6-10 mpg..
It was a easy swap if you are a welder and fabricator..
Next i went diesel.. should have done it in the first place power... and 15 mpg..
__________________
Cummins 12v....nv4500.
Reply With Quote
  #3  
Old June 19th, 2018, 08:06 AM
Von's Avatar
Von Von is offline
Corporal
 
Join Date: Sep 2014
Location: Wichita Falls, TX
Posts: 695
Von is a Soldier
Default

The availability of mount and transmission adapters make the Chevy swap easier. The adapters are pretty expensive though. And they are for mounting to the stock transmission, and most people end up wanting an overdrive transmission instead.
Then rewiring for the ignition. Either wiring in a 12 volt branch just for ignition or converting the while system to 12 volt.

If you can do a little cutting and welding, sometimes it's "easier" to replace all of it at once. And if you can cut and weld then pretty much anything that came in a car or pickup will fit.
Reply With Quote
  #4  
Old June 19th, 2018, 09:08 AM
Mikel Mikel is offline
Sergeant
 
Join Date: Jan 2004
Location: New Haven, CT
Posts: 2,111
Mikel is a Soldier
Default

You will find examples of every conceivable engine swap here. I would look for an engine/2wd OD trans combo to drop into the truck, rather than keeping the T98. Or 4wd trans / married TC if you don't want to deal with the NP200's issues. Lots of options.

Last edited by Mikel; June 19th, 2018 at 09:14 AM.
Reply With Quote
  #5  
Old June 19th, 2018, 10:17 AM
venominjected's Avatar
venominjected venominjected is offline
Corporal
 
Join Date: Apr 2015
Location: Green Bay, WI
Posts: 610
venominjected is a Soldier
Default

Ford 300 I6, Cummins 6BT 5.9, Chevy SBC seem to be the big ones...

LSx, Big Block, and 8.1L Vortecs have also been done/inprogress also.

I drove my tornado home and pulled it.... it ran... barely.
__________________
1967 M715, 6BT, ZFS542, NP205
Reply With Quote
  #6  
Old June 19th, 2018, 11:29 AM
Don Cavey's Avatar
Don Cavey Don Cavey is offline
Staff Sergeant

 
Join Date: Jan 2011
Location: Fernandina Beach, FL
Posts: 4,095
Don Cavey is a Soldier
Default

Don't ask me, I love the Jeep 230 CID Tornado engine. Mine runs just great, not a lot of power but it is what I remember from... 1969-70 when I drove them.
Reply With Quote
  #7  
Old June 19th, 2018, 12:29 PM
venominjected's Avatar
venominjected venominjected is offline
Corporal
 
Join Date: Apr 2015
Location: Green Bay, WI
Posts: 610
venominjected is a Soldier
Default

Quote:
Originally Posted by Don Cavey View Post
Don't ask me, I love the Jeep 230 CID Tornado engine. Mine runs just great, not a lot of power but it is what I remember from... 1969-70 when I drove them.
And my guess is if you didn't have those memories and emotional attachment you would have or would at least be considering an engine swap.
__________________
1967 M715, 6BT, ZFS542, NP205
Reply With Quote
  #8  
Old June 19th, 2018, 04:00 PM
67smith's Avatar
67smith 67smith is offline
Private 1st Class
 
Join Date: Sep 2014
Location: Southern New Hampshire
Posts: 280
67smith is a Soldier
Default

Quote:
Originally Posted by venominjected View Post
And my guess is if you didn't have those memories and emotional attachment you would have or would at least be considering an engine swap.
I wouldn't consider a swap, my 715 will be as stock as it could be with the slight exception of possibly LED auxiliary lights, and a 12v accessory plug for things like a dash cam.

I'm trying very hard to keep the reo oa331 gas motor in my M35, has a few issues, and fuel economy is poor (4-6mpg) but I wouldn't want to swap it at all (and I'm a diesel guy at heart.)

But, in all honesty, the sbc is going to be the best option, so many configurations available for making the most power.

Sent from my SM-S920L using Tapatalk
Reply With Quote
  #9  
Old June 19th, 2018, 04:11 PM
kyken's Avatar
kyken kyken is offline
Sergeant

 
Join Date: Jul 2009
Location: Louisville, KY
Posts: 1,524
kyken is a Soldier
Default

I'm happy with the 230. I did put the electronic ignition in it. It's doing great.
__________________
Thanks for all the help!
Reply With Quote
  #10  
Old June 19th, 2018, 06:14 PM
ray steadward ray steadward is offline
Private 1st Class
 
Join Date: Feb 2007
Location: Bloomfield CT
Posts: 388
ray steadward is a Soldier
Default

If you are going to pull the 230, i believe someone from Maine is looking...
__________________
Is that real money?
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not 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

Forum Jump


All times are GMT -7. The time now is 02:05 AM.

 

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
1998 - 2019


This site is owned and operated by:
M715 Zone, LLC
President: Jon Schmidt, User ID=brute4c
If you have any suggestions, comments, problems or questions, contact:  brute4c@m715zone.com

Use of this site means you understand and agree to our TERMS OF USE

Copyright Notice:
This web site is subject to the protection of the copyright laws of the United States and other countries. Except for Personal Use Only, you may not modify, copy, distribute, transmit, display, perform, reproduce, publish, license, create derivative works from, transfer, or sell any information obtained from any part of the M715 Zone website without the prior written permission of M715 Zone, LLC.

Written permission can only be obtained by contacting
brute4c@m715zone.com

Copyright 1998-2019