having been on the road for approx a month now a few niggles are starting to show up.

todays niggle for you to solve is this: when i am giving the car some redline action up to 100mph+ into say third gear the engine loses all power and may even cut out after 20-30 seconds of spitting and coughing and the odd back fire. It also did this today on the motorway at the same speed in 6th. cant be sure as i was rather distracted but think we were on about 7000 rpm. On the motorway we had been at that speed for about 2 miles only.

Now, i at first thought some sort of electrical malfunction but i have been over all the wiring at it seems fine. the fact that it seems to be regular after giving the engine a hard time and after the cutout happens and maybe a minute goes by all returns to normal i am now thinking fuel starvation.

if any one thinks different then please say so.

On my fuel system i have a solid state fule pump from mac 1 which they reccomended after my big ol rover v8 one was way over fueling apparentley. the pump leads to a fuel regulator also from mac1. this is was set at 0.5 on the round dial for the SVA and i now tried it at 1.5 but still getting the problem. what rate should this be at???? this then leads to a standard plastic filter (£2 type) near the carbs. its the type with a bowl type arrangment and gravity fed out from below. then straight into the carbs.

on a funnier note was out doing a demo run last night for a friend and no helmets etc and about 70 mph building speed went around a corner to see one loose chippings sign and then the road surface changed......OMG..... it could only have been done that day as there were that many stones loose. I now think i know what omaha beach must have been like on D-Day. at least i left 2 big long black lines in it where we tried to slow after the first barrage of stones.

any ways help with the fuel would be great thanks. i am off to pick some more stones out of the car.

haha... forgot to say its a MK indy carb Blackbird

[Edited on 3/8/07 by pif]

Drop off the carb float bowls, check that all is clean and measure your float heights.

How are the carbs mounted? foam filter? original airbox? and does it only happen at speed?

Pif you have U2U!

Steve

Is its carb engine ?

If so an aftermarket pump and regulator is a no no.
The regulator as be be set that low flow becomes a problem. Some get away with it but no many.

Try a bike pump, I have one here to loan if you wish, my 2p says the problem will go away.

Tis true! Bike carb often like bike pumps... Car pumps and regulators often cause problems on bike carbs (apparantly)....

FAO of awinter and jon.

tis on tts sausage filter and plate and yes only happens at speed and after some redlining action of maybe 30-40 secs.

did originaly have a bike pump from a bike breakers, allegedley from a blade, but no guarantees. it wouldnt get any where near the fuel needed and was swapped for the car pump which then way overfuelled and was advised by mac 1 to get the current set up

i'll go get some pictures up now.

photos in archive now

[Edited on 3/8/07 by pif]

I've heard of someone having fuel starvation problems because the wire to the fuel pump was too small. A fatter cable was all it needed. Pretty sure it was a BEC but i don't remember much more than that.