pif
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| posted on 3/8/07 at 08:54 AM |
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BEC fuel starving problems
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]
been a bit of a rush job really, bodged it all together in just 5 1/2 years.
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Coose
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| posted on 3/8/07 at 09:10 AM |
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Drop off the carb float bowls, check that all is clean and measure your float heights.
Spin 'er off Well...
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awinter
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| posted on 3/8/07 at 12:08 PM |
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How are the carbs mounted? foam filter? original airbox? and does it only happen at speed?
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worX
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| posted on 3/8/07 at 12:53 PM |
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Pif you have U2U!
Steve
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Jon Ison
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| posted on 3/8/07 at 01:01 PM |
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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.
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BenB
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| posted on 3/8/07 at 02:06 PM |
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Tis true! Bike carb often like bike pumps... Car pumps and regulators often cause problems on bike carbs (apparantly)....
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pif
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| posted on 3/8/07 at 02:54 PM |
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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]
been a bit of a rush job really, bodged it all together in just 5 1/2 years.
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chriscook
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| posted on 3/8/07 at 04:53 PM |
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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.
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