snot35 Posted April 26, 2012 Report Share Posted April 26, 2012 I know some people are feeding twin carbs with the stock K fuel pump. Anyone know the HP or flow limit of a stock pump before you actually have to install an electronic? Cheers Mike Quote Link to comment Share on other sites More sharing options...
phat rolla Posted May 13, 2012 Report Share Posted May 13, 2012 i know to run 40mm webber carbs on a 4ac/4age youd want a 4psi elec pump not sur eon the size of ur twin carbs on a 4k and i don't know the pressur eof the standard pump but I'm sure you would want to get a slightly higher intesity pump Quote Link to comment Share on other sites More sharing options...
phat rolla Posted May 13, 2012 Report Share Posted May 13, 2012 excuse my poor spelling and grammar there keyboard is all sticky coffee nachos and beer on keyboard isnt goooood lol Quote Link to comment Share on other sites More sharing options...
coln72 Posted May 13, 2012 Report Share Posted May 13, 2012 Thought I that my old 5k running 3k-b carbies felt stronger in the top end when it was fitted with the electric pump. So I would guess that the standard pumps limit is low. Quote Link to comment Share on other sites More sharing options...
GJM85 Posted May 13, 2012 Report Share Posted May 13, 2012 Delivery pressure is 20-30 kPa depending on the strength of the spring. Quote Link to comment Share on other sites More sharing options...
snot35 Posted May 13, 2012 Author Report Share Posted May 13, 2012 (edited) Yeah I might have to go electric, I'm thinking of boost.... :D It was just more of a curiosity thing! Edited May 13, 2012 by snot35 Quote Link to comment Share on other sites More sharing options...
philbey Posted May 14, 2012 Report Share Posted May 14, 2012 I run a stock pump without a single problem. Twin dellorto's running 4psi and 68rwkw. Never had any reason to suspect they're running out of juice at the top end. Quote Link to comment Share on other sites More sharing options...
Andy43 Posted May 15, 2012 Report Share Posted May 15, 2012 The stock fuel pump delivers 900cc per minute at 2900rpm Its pressure 3 to 4.3 psi. On a ke30 if you unscrew the fuel pump inlet connection you will see a restriction, If you have a old inlet manafold lying around, you can remove the connection for the power booster unscrew that, drill it out and install on to the fuel pump inlet to replace the restrictive one. Quote Link to comment Share on other sites More sharing options...
philbey Posted May 17, 2012 Report Share Posted May 17, 2012 Well that works out to 170 horsepower using injector maths. If you can run your k engine hard enough to starve you're doing pretty damn good. Quote Link to comment Share on other sites More sharing options...
Andy43 Posted May 21, 2012 Report Share Posted May 21, 2012 Well that works out to 170 horsepower using injector maths. If you can run your k engine hard enough to starve you're doing pretty damn good. Philbey, Thats tricky do you have a formula or web link. Thanks Andy Quote Link to comment Share on other sites More sharing options...
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