Is anti surge collector required?

Allan Robinson · Post by **Allan Robinson** » Wed May 27, 2015 8:59 pm

Hi all. Has anyone had any experience with anti fuel surge devices for carburettors?

My car is a Dax Rush kit car with an Edelbrock carburettor powered RV8 and am in the process of having a bespoke long range fuel tank manufactured. One of the optional extras is to have an Anti fuel surge collector installed over the fuel pickup to the front and near side end of the tank.
I realise that this would be very desirable for an injection system but not sure if a carburettor would suffer to the same extent?
My tank measures 900mm long by 270mm square with the fuel pickup at the near side end. Could hard left hand turns or foot to the floor acceleration cause a carburettor to falter? If so at what point could this be a problem i.e. tank half full?
Is it normal for a carburettor powered car to require some form of anti surge device?

I look forward to your thoughts and opinions.

Allan

stevieturbo · Post by **stevieturbo** » Wed May 27, 2015 10:02 pm

Allan Robinson wrote:Hi all. Has anyone had any experience with anti fuel surge devices for carburettors?

My car is a Dax Rush kit car with an Edelbrock carburettor powered RV8 and am in the process of having a bespoke long range fuel tank manufactured. One of the optional extras is to have an Anti fuel surge collector installed over the fuel pickup to the front and near side end of the tank.
I realise that this would be very desirable for an injection system but not sure if a carburettor would suffer to the same extent?
My tank measures 900mm long by 270mm square with the fuel pickup at the near side end. Could hard left hand turns or foot to the floor acceleration cause a carburettor to falter? If so at what point could this be a problem i.e. tank half full?
Is it normal for a carburettor powered car to require some form of anti surge device?

I look forward to your thoughts and opinions.

Allan

Depends on the size of the float bowls, power being made and duration of that corner.

Some will suffer fuel starvation, some wont.

If you're going to the trouble of a custom fuel cell, then I know I'd be wanting to future proof it to cover all scenarios, especially if you might do some racing in it

Ian Anderson · Post by **Ian Anderson** » Thu May 28, 2015 5:42 am

https://m.youtube.com/watch?v=N_jsSPRUTSA

In short yes

But perhaps an easy way is to fit above stuff

Ian

sidecar · Post by **sidecar** » Thu May 28, 2015 6:20 am

I like Edelbrock carbs, I've worked on loads of them over the last few years, one thing I will say is that I don't think that they are a 'racing' carb, my Cobra replica can be made to mis-fire if I really, really corner hard. The carb will also cause the engine to run rich if you brake really hard, in other words just the sort of stuff that you would do on a race track. Raising the floats 3mm which drops the fuel level 3mm improves the situation but you can only go so far with this sort of 'fix' before it causes other problems.

Allan Robinson · Post by **Allan Robinson** » Thu May 28, 2015 7:58 pm

Thanks everyone for your input. You know how it goes, you start off with the bare essentials at about £500 and before you know it, add a few bells and whistles and we are soon looking at £1000.

Ian, that Holley Hydramat looks amazing. Too good to be true really but I guess if it is as good as it looks will be bad news for all those manufacturers making swirl pots and anti-surge collectors! I will certainly look into it in more detail.

StevieTurbo, Your Granada’s performance against that Hyabusa Turbo Dax was truly unexpected. I would have put money on the Dax. Good job I’m not a betting man.

StevieTurbo and Side Car, With regards to carburetor issues, I guess there are just so many variables with gravity affecting the floats, fuel in the supply pipes and of course the tank itself. Takes some getting your head around when chasing erratic AFR readings which I have been doing for years. At the end of the day a carburetor is always going to be about finding the best compromise over all conditions.

Based on your input I will fit an anti surge collector (or Hydromat) if only to rule out that element of doubt when once again chasing that perfect AFR.

Thanks again all.

Allan

mgbv8 · Post by **mgbv8** » Thu May 28, 2015 8:01 pm

Ian Anderson wrote:https://m.youtube.com/watch?v=N_jsSPRUTSA

In short yes

But perhaps an easy way is to fit above stuff

Ian

That is very interesting Ian

stevieturbo · Post by **stevieturbo** » Thu May 28, 2015 9:31 pm

Hydramat looks very interesting.

Strangely there was a similar product for squeezy bottles on Dragons Den a few years back, where the tub tube would ensure all liquid was used in the bottle.

Either way, it's a custom cell, I'd be amazed if you couldnt find room on that cell for a small sump say 4-5" diameter and maybe similar depth.

That should cover almost all eventualities with a carb setup, maybe with some decent baffles and foam in tank for extra measure

JSF55 · Post by **JSF55** » Thu May 28, 2015 9:52 pm

My mate Lawrence sent me something on corner pick ups I think this was it
http://www.vaporworx.com/corner_pickups ... ansfer.htm

Gavin RS · Post by **Gavin RS** » Fri May 29, 2015 9:53 am

Weber 500 CFM definitely has problems on track with fuel surge.

My race SD1 when I first fitted the Weber battled in the corners with surge on its first race. I imported high flow off road needle and seats from the US and also fitted a fuel surge tank with a facet red top fuel pump and problem sorted .

Eliot · Post by **Eliot** » Fri May 29, 2015 10:27 am

JSF55 wrote:My mate Lawrence sent me something on corner pick ups I think this was it
http://www.vaporworx.com/corner_pickups ... ansfer.htm

Wow what a clever device.

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