Ok
Good luck with the carb swop.
Regards
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Ok
Good luck with the carb swop.
Regards
The I had a similar problem with a rebuilt engine many years ago, and after reading your post today I remembered the cause. I don’t know how long your engine was out for repair and the reason for the rebuild so I may be off the mark but is your exhaust system causing a restriction. The symptoms are similar lack of power and black smoke under load also if run long enough engine temperature can rise, quickly and very high as the engine cannot get rid of the heat. The engine also cannot breath and will not pull in a full charge of air due to valve overlap which occurs at the end of the exhaust stroke. At this time the exhaust valve is held open just long enough to assist in drawing air into the cylinder with the inlet valve just opening.Sounds silly but in normal operation the exhausting gas will create a small vacuum in the cylinder thus assisting in purging the cylinder and drawing in the air fuel mixture.
So before you do too much more check exhaust flow, it may sound good idling in the yard but can be blocked, a drive up the road with someone following should tell you it will sound restricted. If you canÂ’t do that another way is too install a mercury manometer into the exhaust manifold or a water manometer in to the inlet manifold and check flow. The inlet manifold should show a vacuum when running, after checking inlet vacuum during a drive up the hill then disconnect the exhaust and retry if there is no blockage the vacuum will be the same or very similar if there is a big difference I would suspect a restriction in the exhaust.
And if using a manometer in the exhaust manifold you will se a high reading if the exhaust is blocked.
Hope this makes sense and assists you Gippy
That sounds like a definite possibility Gippy. I'll grab my neighbour this afternoon when I get home and see if his observations can shed light any light on your theory. Thanks for the heads up.Quote:
Originally Posted by Gippslander
Well how did it go we’re you able to resolve the issue, I hope you have would be great to hear a result.
gippy[smilebigeye]
Sorry Gippy for being tardy with my reply - I've only just seen your latest comment on the post. To answer your question accurately, I'll give you as much background into the vehicle that I can. When I first bought it, I drove it into All Four X 4 Spares to show Pete the owner. I've owned a number of Series Land Rovers and have dealt with him for many years. One of his comments, that I didn't think much about at the time, was that it has the 4 cyl firewall and motor but has the 6 cyl engine bay. I guess someone replaced the rusty front chassis half with what could be easily found. What this means is, of course, that it doesn't have the standard 4 cyl aircleaner set up and the radiator is further from the motor so the top radiator hose is stretched and the bottom one is from an entirely different vehicle. It also had a Stromberg carb and standard Holden pancake aircleaner. The accelerator setup had also been modified from linkages to cable (which snaps in awkward vehicular situations on a semi regular basis, but that's a separate issue). The new Weber carb was a simple fit but, of course, set up for linkages. Half a day stuffing around and I made up some new brackets and got it running. Next is the aircleaner wouldn't fit. It interfered with the carb linkages but a bit of research later, I found an old Mustang low profile carburettor hat would fit and enable me to run tubing to the Donaldson air cleaner now bolted to the passenger side mudguard. The vehicle seems to be running fine, and a partially blocked set of headers was not an issue. The timing seems to be a touch out and the fuel mixture on the new carburettor could use a tickle. As such, I've decided to put it on a tilt tray and send it to a bloke with a dyno and experience with modified carburettor motors. I'll get him to sort the old girl out perfectly and get the settings from him so I can maintain them as such. I'm also a touch curious as the how far out my current settings are vs a good dyno tune.