Lason

iTrader: (1)

Anyone done this on a LSX? Im about to order the fuel system for my car and I would like to run a aeromotive belt drive pump but the only hurdles I can see are the drive mandrel for the pump and actually mounting it. I saw ATI made a balancer that deletes the a/c pulley and uses a pulley for a external oil pump or fuel pump. Anyone try one of these yet? Also any pics of mounted pumps would help also.

JMBLOWNWS6

iTrader: (17)

When there are so many monster electric pumps available why do you want to do this?

Lason

iTrader: (1)

Multiple reasons. Mainly because I dont want to have to worry about my fuel system later on if I turn the boost up. Also I hate loud pumps, and am tired of having them burn up, pop fuses, etc etc. I can run a belt driven pump for a few bucks more initially and never have to worry about the noise, having it burn up or anything. Only problems would be possible belt being thrown and initial starting if the car sits for a few weeks.

This is going in a tubbed out '73 Datsun with a turbo LS1, glide.

ALLBOTTLE

iTrader: (13)

Go with a magnafuel pump, all the pump you will ever need, it's quiet and totally rebuildable.

Belt drives are a PITA to tune, and unless you plan on using the 250 PSI tha pump can produce it's beyond overkill.

Now if this was a mechanical injection setup like an enderle then it would be a different story.

Lason

iTrader: (1)

I have run Magnafuel, Aeromotive and a few others. My second choice is magnafuel pump/aeromotive regulator setup BUT I am interested in trying out a belt drive setup. I have heard of a lot of people making less tanywhere from 400-1500 horsepower driving with them on the street and they all love them. Im trying to get away from pumps that are loud, prone to burning up with street driving but will still give me the volume (not just pressure) that I need without expensive step down boxes.

As far as tuning goes, everyone I have talked to that uses them says there is no special tuning. Run the pump at 60% the crank speed and set your reg as you would an electric pump.

Anyway I just needed info or leads on mandrels for LSX's and see if anyone had pics of installed belt drive pumps. Thanks.

y2khawk

iTrader: (5)

that one is mounted to the motor plate. Mine is driven off the back of the dry sump.

We both have ATI damper hubs with HTD drive where the AC pulley normally goes.

Lason

iTrader: (1)

Thanks Y2khawk! That pump looks like its mounted a lil high isnt it? I talked to ATI about their balancer and they werent very helpful about it. They said they dont offer anything with a 14 tooth count so with a 25 tooth count I would need like a 46 or 48 tooth pump pulley.

camarols1

iTrader: (17)

I am considering this setup as well since I am entertaining the use of E85.
Anyone have drive mandrel info???

Lason

iTrader: (1)

I found a machinest on another board who has offered to make me a mandrel but I have to get the parts first and do some measuring. You may also try contacting Peterson Fluid and see if they will custom make you a mandrel. I think that would be the easy part, finding a 16mm x 2.0in bolt long enough to fit the balancer and mandrel may be the harder part.

Just for an FYI, a small block ford uses a 5/8" balancer bolt, slightly larger diameter than the LSX's 16mm bolt. You may be able to use a mandrel for a SBF and get a machinest to machine a sleeve to get a snug fit from 5/8 to 16mm.

y2khawk

iTrader: (5)

That's where we had room at the time.

as for ATI, yes they only offer a 25 tooth drive hub.

You can get a front mount mandrel from Perterson that uses gilmer drive instead and can go much smaller on the drive pulley. This http://petersonfluidsys.com/drive_spline.html
Has a hub that bolts to the front of the ATI damper.

we are actually driving the fuel pump off the oil pump shaft. I think the oil pump has a mid 40 tooth pulley, and we're about 1:1 off the oil pump shaft to the fuel pump.

It's a little tough on initial prime being up that high, but it works. That's part of why mine is on the back of the oil pump. Low mount

Lason

iTrader: (1)

Thanks alot, you have been a lot of help!

camarols1

iTrader: (17)

Thanks for the info y2khawk!
I will contact peterson about a drive unit.
I believe ATI's drive hub will only work for dry sump setups, but
another option would be drive a hex drive pump off the cam gear.
I would think the mechanical pump setup would be fine for occasional
street duty.
No fuses/relays to burn up, and no mega AMP alternator needed.
My ride is a race car first, then street car so I don't have to worry about
heating the fuel on long highway trips.

Lason

iTrader: (1)

Talked to ATI and Fluidampr and both use tradition 3 bolt small block chevy patterns on their balancers so you can run either one, then use a 3 bolt mandrel for a small block chevy. Thats the route Im going to go myself. Just waiting to hear back from peterson fluid about their spline drive and then I can start ordering parts.

Fireball

iTrader: (21)

You can run the ATI BBC mandrel if they do a little bit of machining on an ATI damper. This is shown with the Aeromotive drive pulley on the mandrel

Lason

iTrader: (1)

OK Im lost then. I got an email back from ATI this morning saying their LS1 balancers have the small block chevy 3 bolt configuration but your saying you can use a big block mandrel? I was under the impression they were different bolt patterns.The bolt pattern they mentioned was a 3 on a 3.200" pattern by the way.

Oh and what kind of machining would they have to do?

Fireball

iTrader: (21)

they had to open up the front of the hub a little bit so the mandrel locator would slide in.

ALLBOTTLE

iTrader: (13)

So all you need is a drive ratio that will spin the pump at 2/3 the speed of the crank?

I like the idea.

Twin76mmTA

iTrader: (1)

What size feeds to the pump and then to the rails is everyone running?

camarols1

iTrader: (17)

Aeromotive suggested a -12 from the rear to the pump, but I
believe most are running a -10 feed and -8 to the rails.
Having a rear mount cell makes it hard for the pump to draw fuel,
but I would think -10 would be big enough for gas.
I am thinking of running e85, so I may upgrade to a -12 feed and use
a -10 return just to be safe.
I will need 1000lbs/hr at 85+ psi to use 96lb injectors with my power goals.
I think this setup would have better manners than the HUGE 160lb injectors
on a street driven ride.

Phil99vette

iTrader: (11)

Here are some pics of my homebrew belt drive. I used an ATI Damper, Jones Drive system, Aeromotive fuel pump. Everyone said to go with a belt drive because the BIG electric pumps are not as consistent.