I has me beat .....any suggestions

Hi All,


PLR - My humble apologies I can't read / understand my own post ....you are absolutely correct :D

superquag - appreciate the lead and thoughts on colurtune on ebay need run that past SWAMBO as I've spent a few dollars to this point.
That and a balancer for carbies will be on my wish list of must haves for my toolbox.....

RR350 - could the sooty plugs be causing misfire, I'm hoping its not the Distributor. There's not many RRC I see wrecking in Perth as I'd love to do distributor conversion as per bee utey suggestions. Prior to electric fuel pump being replaced there was no issue with misfiring in engine. I'd always had a rich mixture and not having the proper adjusting tool it was a case of if its working fine don't meddle with it :D
Rebuilding the carbies came about after fitting the new fuel pump..as engine would'nt idle any lower than 2000 rpms with idle screw backed right off and I did have a problem with leaking manifold (refer my earlier post) which are now all fixed.

I now have an engine that idles beautifully (higher and lower) and carbies that when I adjust the throttle screw on each will raise and lower revs individually as they were intended.

67Hardtop - Yes a compression test is the other thought (I don't have one) that's why I havent done one yet. If this misfire persists after all avenues exhausted, Ill borrow or purchase one and see what that shows.

Rupert Prior - I believe that you and PLR have hit it on the nail with sooty spark plugs and I'm hoping the source of the misfire.
I may look at removing the current manual /auto choke conversion,blanking it off and see how it runs.

Thanks everyone ....as a spanner turner Level 1 the problem faced by me is the more you take on doing it yourself for a) cost b) satisfaction in learning to do the job yourself - is that you have to buy the tools and gauges necessary to do the job and in my case slows the process down due to available $$$


Im hoping the carbie set up / sooty plugs is the reason for misfire as all was fine before replacement of fuel pump, but understand that Murphys Law it could now be something new.....


Again ....All suggestions posted will be looked at and its discussions like these that really help you work through the problem.

I'll post the results ......

Cheers


Baggy

Quote ...........'Prior to electric fuel pump being replaced there was no issue with misfiring in engine.' .............Unquote

Was unaware of the fuel pump replacement............. You did install a low pressure one? High pressure pump (efi) will cause flooding / rich mixture.

Following on from that, find the single return line to the fuel tank (undo its cap), blow air down the line with a compressor to make sure it's not blocked. Be interesting if that line to the tank comes directly from the carb associated with the problem cylinders, after collecting excess fuel from the other carb.

Blockage is usually in the metal fitting that goes into the fuel tank at the end of the plastic line, it rusts or something.

cheers, DL

Quote:

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Originally Posted by Baggy

I'm spanner turner level 1 and don't know about advance weights in distributor

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The weights are below the points plate. Twisting the rotor button in the direction of rotation should encounter light then heavier spring resistance prior to a firm stop but inspecting the weights themselves for freedom to move is really required. 1 or both springs can break too but the weights not functioning correctly is more associated with poor power at low to mid revs under load due to lack of ignition timing advance.

I brought a Petronix Flame thrower distributor to suit Rover V8 from Amazon over Christmas, was on special. US$250 delivered to door, really good units pretty well plug and play, already with good advance curves etc. Good replacement for stock units gets rid of points etc. They get good reviews in States. Cheaper than fitting a Piranha kit (I have used them before as well and it was good gear- lasted years).