Go Back   Horizons Unlimited - The HUBB > 4 wheels > 4WD Overland Tech

4WD Overland Tech GENERIC 4WD / 4 wheel TECH discussions and info that is valid for ALL brands. See brand specific forums.
Contact Overland Solutions for all your custom modifications and setup for overland travel.

Calendar Contest Voting is now CLOSED. Results to be posted shortly.


Visit Matt Savage for VIAIR compressors, Air Lift Helper Springs, Tyre Levers, Chris Scott's Books & DVDs, KC Daylighters, Allisport Intercoolers, Overland Preparation and lots more!

Reply
 
LinkBack Thread Tools Display Modes
  #1  
Old 7 Jul 2007
Registered Users
HUBB regular
 
Join Date: Apr 2007
Posts: 48
Blow back on V8

Hello everyone, on our way to ghana and since leaving the Uk we seem to have a blowout happening with our 3.4 V8 in our landy. The last part of the exhaust is just new, we checked all filters and fuel stream (constant and fine) but somehow as soon as we drive around 15,35,65 it seems as if the engine holds back, then jumps forward. Several machanics say they cant see anything wrong, carbs are set correctly at 27 last moneth, but sometimes the little balc caps come off (mechanic said this should no a problem??) , no cables touching with metal.... Could it be the air pressure in the exhaust, and does anyone recognise this problem???

ANY IDEAS?????Hope you can help,

Many thanks Lotty
Reply With Quote
  #2  
Old 7 Jul 2007
Gipper's Avatar
Contributing Member
Veteran HUBBer
 
Join Date: Mar 2004
Location: Banff,Canada/Poole,UK
Posts: 685
Hi Lotty

Do you mean the V8 is backfiring ???

'black caps coming off ' - which ones do you mean ? on the carbs ?

what year is you Landy and is it an original V8 or a conversion ?

a few things to try in order - simple first !


1 - are the ignition leads BRAND new ? if not replace them - this is a common cause of backfiring with Rover V8s - if they are new - clean them & use some silicon grease on all the lead ends to ensure a good connection.

2 - older Rover V8s tend to wear there points/rotor arms fairly quick - check for wear - even on what is a fairly new set, also the distributor cap while you are there - any pitting and carbon deposits removed.
The ignition coil and timing obviously have to be spot on too....

3 - check your plugs next if 1 & 2 does not improve problem.

4 - Rover V8s run hot - as youll know from the roasting transmission tunnel !!!this can cause a vapor lock in the fuel system - you say the fuel feed is good - does the problem occur when engine is is hot or cold - vapour locks will occur when engine is hot and the vehicle is travelling slow (less airflow through engine bay)

this can be a problem on V8 conversions with fuel lines run too close to the engine -also in line fuel filters can be where this happens if they get too hot- if this is the problem make up a 'heat shield' with some metal or non flammable material covered in cooking foil between engine and fuel line.

what carbs are they ? SU or Stromberg ? - if all the above does not work, then you might have a a problem with a carb

- the dash pots on SU s should be filled with 20 or 30 weight oil (if they empty quickly the carbs are worn) and the caps should not come off as they have a fine screw thread.....

let us know if these steps work.....

oh yeah - the exhaust - is it a standard or performance one ? - it shoudnt make much difference - if it is a performance box then you will tend to get some 'popping' on the overrun (when you come of the throttle under engine braking) but not full backfiring....

cheers
Grif
__________________
Cheers
Grif

'09 Suzuki DR650
'00 Discovery Series 2 V8
'95 Defender 90 300 Tdi Overlander
http://gipperstravels.blogspot.com/

Last edited by Gipper; 7 Jul 2007 at 20:43.
Reply With Quote
  #3  
Old 8 Jul 2007
Registered Users
Veteran HUBBer
 
Join Date: Feb 2004
Location: UK
Posts: 886
also if the timing is out, either through incorrect setting or a dodgy coil or codenser it could cause unburnt fuel to enter the exhaust where it will then ignite, causing a 'backfire'
Reply With Quote
  #4  
Old 12 Jul 2007
Registered Users
HUBB regular
 
Join Date: Apr 2007
Posts: 48
yhanks for all the replies! we have just bought some carburator oil and are hoping that after reading loads on it, this may solve it all....
Lotty
Reply With Quote
Reply


Currently Active Users Viewing This Thread: 1 (0 Registered Users and/or Members and 1 guests)
 
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
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Half LWR and back michaeltharme Route Planning 0 17 Dec 2006 00:52
Fitting back in to normal life HELP loxsmith Travellers' questions that don't fit anywhere else 12 18 Oct 2006 18:50
Driving back or flying back from India to NL? peerke Route Planning 4 2 Oct 2003 00:49
Germany - Senegal and back with the motorbike Bloody Sahara Travel Forum 2 29 Jan 2002 19:24
Burkina Faso back to Morocco Andy Hunt Sahara Travel Forum 0 24 Jul 2001 16:44

 
 



HU DVD Spring Special!

Buy the Achievable Dream Collectors Set and get Road Heroes Part 1 FREE!

Achievable Dream - The Whole Enchilada!

Cooped up indoors in crap weather? Binge watch over 20 hours of inspiring, informative and entertaining stories and tips from 150 travellers! Check it out at the HU Store! Remember to order them both and use Coupon Code 'BoxSet+' on your order when you checkout.


What others say about HU...

"I just wanted to say thanks for doing this and sharing so much with the rest of us." Dave, USA

"Your website is a mecca of valuable information and the DVD series is informative, entertaining, and inspiring! The new look of the website is very impressive, updated and catchy. Thank you so very much!" Jennifer, Canada

"...Great site. Keep up the good work." Murray and Carmen, Australia

"We just finished a 7 month 22,000+ mile scouting trip from Alaska to the bottom of Chile and I can't tell you how many times we referred to your site for help. From how to adjust your valves, to where to stay in the back country of Peru. Horizons Unlimited was a key player in our success. Motorcycle enthusiasts from around the world are in debt to your services." Alaska Riders


contest pic

10th Annual HU Travellers Photo Contest is on now! This is an opportunity for YOU to show us your best photos and win prizes!

NEW! HU 2014 Adventure Travel T-shirts! are now available in several colors! Be the first kid on your block to have them! New lower prices on synths!

HU 2014 T-shirts now in!

Check out the new Gildan Performance cotton-feel t-shirt - 100% poly, feels like soft cotton!


What turns you on to motorcycle travel?


Global Rescue, WORLDwide evacuation services for EVERYONE

Global Rescue is the premier provider of medical, security and evacuation services worldwide and is the only company that will come to you, wherever you are, and evacuate you to your home hospital of choice. Additionally, Global Rescue places no restrictions on country of citizenship - all nationalities are eligible to sign-up!




New to Horizons Unlimited?

New to motorcycle travelling? New to the HU site? Confused? Too many options? It's really very simple - just 4 easy steps!

Horizons Unlimited was founded in 1997 by Grant and Susan Johnson following their journey around the world on a BMW R80 G/S motorcycle.

Susan and Grant Johnson Read more about Grant & Susan's story

Membership - help keep us going!

Horizons Unlimited is not a big multi-national company, just two people who love motorcycle travel and have grown what started as a hobby in 1997 into a full time job (usually 8-10 hours per day and 7 days a week) and a labour of love. To keep it going and a roof over our heads, we run events (22 this year!); we sell inspirational and informative DVDs; we have a few selected advertisers; and we make a small amount from memberships.

You don't have to be a Member to come to an HU meeting, access the website, the HUBB or to receive the e-zine. What you get for your membership contribution is our sincere gratitude, good karma and knowing that you're helping to keep the motorcycle travel dream alive. Contributing Members and Gold Members do get additional features on the HUBB. Here's a list of all the Member benefits on the HUBB.



Books & DVDs

amazon

All the best travel books and videos listed and often reviewed on HU's famous Books page. Check it out and get great travel books from all over the world.


Motorcycle Express for shipping and insurance!

Motorcycle Express

MC Air Shipping, (uncrated) USA / Canada / Europe and other areas. Be sure to say "Horizons Unlimited" to get your $25 discount on Shipping!
Insurance - see: For foreigners traveling in US and Canada and for Americans and Canadians traveling in other countries, then mail it to MC Express and get your HU $15 discount!






All times are GMT +1. The time now is 03:04.