daverclasper Posted May 5 Report Share Posted May 5 Hi. I was wondering about this known method. It could give an accurate measurement of the needle height , though maybe not necessarily the air flow into each carb, as the pistons may have different sliding resistance due to wear etc. Link to comment Share on other sites More sharing options...
Iain T Posted May 5 Report Share Posted May 5 Much simpler to just buy a carb synchronizer which takes away the variables. For the small price it will last a lifetime. Iain Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 5 Report Share Posted May 5 yes there are or were simple height meters made to do just that think we discussed any means to check the idle running height of the air piston is a good practical test idea far better than trying to listen to the air hiss which doesnt do much Pete Link to comment Share on other sites More sharing options...
johny Posted May 5 Report Share Posted May 5 Also I think any slight difference at idle passes into insignificance as the butterflies open up more when driving.... Link to comment Share on other sites More sharing options...
Pete Lewis Posted May 5 Report Share Posted May 5 in the day you just set the idle screws at the same turns ,and bunged them on , no faffing about with air flow malarkey simple basic mechanical set same as as jonny says as soon as you open the throttles its game over for any "balancing" Pete Link to comment Share on other sites More sharing options...
daverclasper Posted May 5 Author Report Share Posted May 5 50 minutes ago, johny said: Also I think any slight difference at idle passes into insignificance as the butterflies open up more when driving.... 46 minutes ago, Pete Lewis said: as jonny says as soon as you open the throttles its game over for any "balancing" Thanks guys. I had sort of forgot that! Link to comment Share on other sites More sharing options...
dannyb Posted May 5 Report Share Posted May 5 When I had my spit tuned on a rolling road the guy had two modified dampers screwed in the top of the dash pots which had sliding scales so he could see the piston hights for both carbs. Danny Link to comment Share on other sites More sharing options...
Iain T Posted May 6 Report Share Posted May 6 I read it's a good idea to balance at around 2500rpm as that's where the engine spends a lot of time. Iain Link to comment Share on other sites More sharing options...
johny Posted May 6 Report Share Posted May 6 Not a bad idea but dont know if flow meters can handle that.... Link to comment Share on other sites More sharing options...
JohnD Posted May 6 Report Share Posted May 6 Bit like setting throttle valves with a fag paper, or torqueing down bolts by feel. It can be down, with enormous experience and skill, but for the rest of us, there are MUCH better tools! Look for "synchrometer". Link to comment Share on other sites More sharing options...
Iain T Posted May 6 Report Share Posted May 6 11 minutes ago, johny said: Not a bad idea but dont know if flow meters can handle that.... Mine did and it's the common German made one on sale on eBay etc. our engine capacities are relatively small. Link to comment Share on other sites More sharing options...
Iain T Posted May 6 Report Share Posted May 6 7 minutes ago, JohnD said: It can be down, with enormous experience and skill, but for the rest of us, there are MUCH better tools! Look for "synchrometer". I agree! By the way John your suggestion of using O rings to stop oil seeping out of the rocker cover fixings worked a treat Ta😁 Iain Link to comment Share on other sites More sharing options...
johny Posted May 6 Report Share Posted May 6 Did you see much change in balance between idle and 2500rpm Iain? Link to comment Share on other sites More sharing options...
Iain T Posted May 6 Report Share Posted May 6 (edited) In my case no but it may for other engine setups. With my downloaded wsm I have now renewed my relationship with my carbs....🤪 Edited May 6 by Iain T Link to comment Share on other sites More sharing options...
JohnD Posted May 6 Report Share Posted May 6 1 hour ago, Iain T said: I agree! By the way John your suggestion of using O rings to stop oil seeping out of the rocker cover fixings worked a treat Ta😁 Iain Thank you, Iain! Link to comment Share on other sites More sharing options...
johny Posted May 6 Report Share Posted May 6 2 hours ago, Iain T said: In my case no but it may for other engine setups. With my downloaded wsm I have now renewed my relationship with my carbs....🤪 Yes Ive thought before that on idle the butterflies mech is resting on the throttle stops but at revs they are held open by the cable so may actually go out of the carefully set idle balance... Link to comment Share on other sites More sharing options...
Iain T Posted May 6 Report Share Posted May 6 It depends on the relationship with your neighbours re balancing at 2500+rpm🙉. Time to take out my jet assemblies.... Iain Link to comment Share on other sites More sharing options...
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