Fuel system on thirsty lump

topcatcustom · Post by **topcatcustom** » Mon Nov 23, 2009 2:21 pm

Are the plastic with paper element filters ok? My fuel pick up pipe is in fact 2 1/4" pipes that Y piece into the big main hose, its easier to find 2 small filters than 1 filter with big enough ends and the plastic ones are dirt cheap- hence why I'm not sure about them! The biggest I can fit beside the tank is a pair of 2" approx diameter filters in parallel.

gelmonkey · Post by **gelmonkey** » Mon Nov 23, 2009 2:33 pm

Tom
I am running a Facet competition soild state pump which is nice and small for my nitrous system. (5/7 psi and through a regulator and pressure guage)
It is individually switched and will cover my pressure needs for a 100bhp shot.
Make sure that whatever pump you use it is mounted onboobins as they make hell of a noise when running although with your motoe I guess you won't here much anyway!

Cheers
P

gelmonkey · Post by **gelmonkey** » Mon Nov 23, 2009 2:35 pm

DOH
Just read the rest of this thread and you seem to be sorted!!
I'll just go back to the naughty step again

P

topcatcustom · Post by **topcatcustom** » Mon Nov 23, 2009 5:33 pm

No worries! I'm not thinking about nitrous yet, tbh I dont think I will at all on this build as doubt the engine and pistons would take it and gets even more complicated!

Filters???

gelmonkey · Post by **gelmonkey** » Mon Nov 23, 2009 6:07 pm

I use Earls filters which are cleanable and use a sintered element.
I get VERY good discounts with Earls and maybe can sort something out for you when required.
They can be either push fit and clipped or with proper hose ends.
Cheers
P

bones · Post by **bones** » Mon Nov 23, 2009 6:08 pm

the ones i use cost me about 5 or 6 quid, will measure tomorrow, but dia wise about the size of a 10p piece, im good at explaining things to such a high engineering standard

rich

gelmonkey · Post by **gelmonkey** » Mon Nov 23, 2009 6:22 pm

Following on from the incredible technical information above

the earls units are about the same size in diameter and about four inches long.
Are we good to you or what?
P

bigaldart · Post by **bigaldart** » Mon Nov 23, 2009 7:36 pm

I did a bit of reading over the weekend TC and found this thread. Kinda backs up my pump observations earlier.

http://www.yellowbullet.com/forum/showt ... +supported

Alan

topcatcustom · Post by **topcatcustom** » Mon Nov 23, 2009 9:02 pm

Thanks Al, seeing those figures I recon I'll be fine (or not a long way off) I should be running about 7psi boost, blower cam etc I'm hoping around the 300bhp mark? Tried not to get silly optimistic!!

There are some sintered type filters on ebay but wasn't sure about how well they would filter, they are going to be hidden under the panel behind the seats so not fussed about them looking any good! I've got my shiny bits in the front!!

P- for the above reason I'm not fussed about earls filters- if they were going to be seen I would! If they are suprisingly cheap though feel free to let me know what sort of money we're talking.

gelmonkey · Post by **gelmonkey** » Mon Nov 23, 2009 10:40 pm

Tom
Will let you know tomorrow evening okay.
Cheers
P

bigaldart · Post by **bigaldart** » Tue Nov 24, 2009 12:23 am

Don't forget that is flywheel horsepower, you need to account for the blower and other items driving off the front, ie alternator, water pump, power steering, air-con. I would estimate from fuel usage the blower will take at least 50 hp to drive and may well be a LOT MORE. So factor that in together with hills, G-Forces etc and a single blue Holley is marginal at best. Personally I like a lot more reserve than that.

Alan

bigaldart · Post by **bigaldart** » Tue Nov 24, 2009 12:25 am

What capacity and what speed are you running the blower? we make 17 psi @ 11% under, but blower is VERY carefully clearanced and we run a lot more fuel through it. Oh and its a 3.5

Alan

topcatcustom · Post by **topcatcustom** » Tue Nov 24, 2009 1:06 pm

I was told by Nigel at UK Blowers to expect 6.5psi at 10% under on my 4.0 with Offy 360 manifold. And from someone - roughly 50% extra power after the blowers 50bhp drain...

No air con or power steering for me! Real man! I took all that crap off in the name of simplicity, weight and power saving. The pump will be dead easy to get to and as I already have it I will try it but swap it if not man enough, I cant keep putting more money in until its running!

kiwicar · Post by **kiwicar** » Tue Nov 24, 2009 4:19 pm

Hi Tom
I think the increase in power you have been quoted is a little optomistic for the boost figure. Most people work on the folowing equasion.

new output= (original output X (1 + ((boost/atmospheric pressure)x blower efficiency))) -power to drive the blower
so if it takes 20 bhp to drive the blower, the efficiency of the blower is 80% and the boost is 6.5 psi and you had 200 bhp to start with.
new output = (200 (1+ ((6.5/14.7) X .8 )) -20
New O/P = (200X 1.35) -20
New O/P = 251BHP
if you can improve the efficiency of the system with a charge cooler then you can gain a bit by improving the efficiency figure but you have to spin the blower a bit faster to get over the restriction created by the charge cooler and you therefor have to factor in a bigger power loss through the blower! It is all good fun.
Best regards
Mike

gelmonkey · Post by **gelmonkey** » Tue Nov 24, 2009 4:35 pm

Tom
Don't go for the Earls units.
They have rocketed in price since I bought mine and are now silly money!
Sorry about that.
Cheers
Paul