Emissions, fuel regulators, stand off
Discussion
Does anyone know if reducing the pressure of the fuel regulator will successfully reduce unburnt fuel to get through the mot when youre running a hot cam? I'm sure it wont work with SUs because fuel is held in the float chamber, but what about with a webber?
I think i'm getting fuel stand off with my SUs, evidenced by residue in the k&n pancake filters, again due to the cam. Ive got stub stacks but i'm wondering if 50mm ram pipes and socks would be better, to contain the stand off and maybe improve the torque, does anyone run long ram pipes with noticeable benefits? Are the socks any good? I might just go for a webber and i'm hoping to try one on the car over the weekend beacuse ive been told that fuel stand off can be a problem with SUs.
I think i'm getting fuel stand off with my SUs, evidenced by residue in the k&n pancake filters, again due to the cam. Ive got stub stacks but i'm wondering if 50mm ram pipes and socks would be better, to contain the stand off and maybe improve the torque, does anyone run long ram pipes with noticeable benefits? Are the socks any good? I might just go for a webber and i'm hoping to try one on the car over the weekend beacuse ive been told that fuel stand off can be a problem with SUs.
Peter,
It hasnt failed an mot yet, but i was just curious about the fuel regulator thing. My air filters cost about 5 bhp on the rollers and i was toying with the idea of using long ram pipes with socks to contain the fuel stand off as ive been told this can be a problem with SUs. I didnt try the webber at the weekend, instead we fiddled with my SUs and nows its running really well. A while back i spoke to you about the carbs going lean in a corner, which i cured after cleaning the dashpot pistons. However, after a rolling road session this problem came back. Going through it step by step at the weekend we found that the jets needed to come down 1/2 turn and now its spot on.
It hasnt failed an mot yet, but i was just curious about the fuel regulator thing. My air filters cost about 5 bhp on the rollers and i was toying with the idea of using long ram pipes with socks to contain the fuel stand off as ive been told this can be a problem with SUs. I didnt try the webber at the weekend, instead we fiddled with my SUs and nows its running really well. A while back i spoke to you about the carbs going lean in a corner, which i cured after cleaning the dashpot pistons. However, after a rolling road session this problem came back. Going through it step by step at the weekend we found that the jets needed to come down 1/2 turn and now its spot on.
I now have a modified dizzy to suit the engine. I was just curious about the use of a regulator to reduce emmissions, i read that in one of the mini mags.
Peter, do you use spacers between the manifold and the carbs? I havent got any but i wondered if effectively increasing the manifold length and providing some insulation would be of benefit?
I'm also now using a vacuum advance to pull the timing up on part throttle. Will the back plate rattle around?
Peter, do you use spacers between the manifold and the carbs? I havent got any but i wondered if effectively increasing the manifold length and providing some insulation would be of benefit?
I'm also now using a vacuum advance to pull the timing up on part throttle. Will the back plate rattle around?
Thanks for that advice. Again in the mini mags, there was an artical about dizzys that said higher compression engines dont 'need' a vac advance, it didnt say they shouldnt have one! I thought the vac advance would help reduce the cammyness but i'm not convinved it does much there. How do i remove it all together, in particular what do i need to do to make sure the back plate isnt causing scatter?
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