Search found 25 matches

by jagger
Tue Jul 23, 2019 4:03 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.

Thanks Dave. I have all sorts of soldering hardware laying about,from a hot air station for tiddly electronics up to a stonking 100W iron and of course some blowlamps.Numerous solders laying about too,mostly with lead in,some way too big for such a little job. I've soldered wires to individual pins ...
by jagger
Tue Jul 23, 2019 8:56 am
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.

I tried a set of solid disks from an old set of HiFsomethings that came with another engine.Unfortunately,due to their lower overall height they messed up the geometry between the various levers and just jammed everything up.That was fun finding that out.The only new disks I could find for the HiF44...
by jagger
Mon Jul 22, 2019 8:43 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.

Dave, you were spot on.Very early in the post as I see.Emission valves. I decided to get it running and take it for a 250 mile run to my mate's in Devon.Where there are a lot of V8s just hanging about all over the place. It ran like crap whenever I slowed down (hanging throttle) and ran a touch weak...
by jagger
Wed Jul 17, 2019 7:00 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

I'm wondering aloud here. I've just checked/rebuilt/factory set the carbs for the umpteenth time and this is still happening and it appears like a valve opening as the engine hits normal running temps.And the way I got it set up to drive is so fiddle-with-it that it ran weak on the 250 mile drive I ...
by jagger
Wed Jul 10, 2019 1:21 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

I do know the benefits Dave,and can see the attraction (fuel costs). I'm just a bit miffed at the minute with all the work I've put in to be for nowt.It's called sulking I think. Brand new disks from Burlen with overrun valves in them.I tried flat disks but they jammed stuff up in the linkages.The c...
by jagger
Wed Jul 10, 2019 12:25 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

After a slight break I have returned.Sorry the video for the broken engine has gone missing as I shut down my channel hosting it. The slight break was caused by me building an engine to put under the carbs.Vitesse bottom end with some stock carb heads and the usual 3.9 grind replacement cam.It's all...
by jagger
Sat Feb 16, 2019 3:30 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Well that put paid to seeing if the carbs were set up right this time.Wondered why it wouldn't start.Looks like it shed a bit from the dizzy worm drive so carb tuning is the least of my worries. :D

by jagger
Tue Feb 12, 2019 6:00 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

The cool off period went well.I have returned to action. :laser: Well it turns out I wasn't far wrong about the throttle plates.The flat set I fitted from my other HiF44s are a fraction smaller on the vertical plane allowing them to close further,by quite a bit actually, and interfere with the fast ...
by jagger
Wed Jan 30, 2019 2:03 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Thanks Hamish.Yep,it's a bit of a weird one.All worth thinking about. If it wasn't minus something out there I'd go and have a look again.It drove ok yesterday apart from a strange misfire/backfire on closed throttle which I believe is what the poppet valves are meant to combat.Then again it could b...
by jagger
Tue Jan 29, 2019 2:40 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Seems to me you need to set up all the linkages etc by the book. The fast idle cams shouldn't do anything with the throttles closed, and 'choke' not in use. Tried that Dave.On the bench it all looks lovely and per the book.I was well chuffed and thought I'd just drop them back on and everything wou...
by jagger
Tue Jan 29, 2019 12:27 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Well I've managed to drop the tickover. Assembling by the book on the bench everything seemed to go fine.One and a half turns in on the slow idle screws and fast idle set on the cams.I removed the throttle operating levers to aid fitting on the manifold,refitted them and started it, and got an impro...
by jagger
Sun Jan 27, 2019 9:36 am
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

I've seen a few photos of soldering up the poppet valve.Not pretty most of them.As I've got a set of flat plates I can use those to test.I know I can seal the hole better than I've seen done before.A nice patch of carbon fibre should do it.Having seen the price of replacement plates I can see this b...
by jagger
Sat Jan 26, 2019 1:07 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Oh yeah Denis.I believe that. :D And again a good idea that I'll adopt as my own. :wink: The brake servo isn't being used so can be blocked off,the vacuum advance isn't important without load either,and the emissions crap (plenty of those available in a high mileage black death edition V8 like mine)...
by jagger
Fri Jan 25, 2019 9:58 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

Yes.Ian,it does. It'll be getting cut off once I get the carbs back on.I'll D/C stuff one at a time to try and find a culprit.First step is the throttle plates to isolate the emissions valve. I really am looking forward to finding out what's going on.I was starting to like the SUs before this happen...
by jagger
Fri Jan 25, 2019 4:11 pm
Forum: Exhaust, Cylinder Heads, Fuel And Intake Area
Topic: SU HiF6 weird problem on a 3.5 Rover. WITH SOLUTION - and you're not going to like it.
Replies: 41
Views: 12897

Re: SU HiF6 weird problem on a 3.5 Rover.

I'd remove and block all pipes coming from the carbs if I were fault finding this. I've even known a faulty vacuum advance to cause this type of problem, sucking in air, or even cracked pipe between the two. Also any vacuum feed to brake servos or other vacuum devices (my car has vacuum operated he...

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