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Author Topic:   Battery and Fuel Cell Location?
Blind Barney
Dirt Maniac

Total posts: 120
posted November 16, 2004 05:49 PM  
Where do you guys have your fuel cell located? Center, left, right? Battery in the trunk in the cab, left or right?

Eljojo
Dirt Forum Champ
Total posts: 968
posted November 16, 2004 06:00 PM  
Good Q Barn. There are those who run the battery in a box in the car and those who run the battery in the trunk with the fuel cell. Think about it....right in the middle of your fuel call is a cap with a bail on it. That little knot in the middle of that cap is a vent. That allows air in and fumes out. Very few racers run an alternator and prefer to charge the battery back at the shop. Most of the time a spark is generated either installing or removing the charger. Myself I think it is safer in the car, semi isolated from the fuel call (and its fumes).
There are those too, who mount the fuel cell over to the left, hoping to gain a little more "bite" for a drier track. I prefer to mount it in the center and put lead over on the left for that "bite." The new car will have the battery mounted with an access door thru the rear package tray for charging purposes and the fuel call in the center.

I-B-RACIN
Dirt Maniac

Total posts: 132
posted November 16, 2004 06:12 PM  
Fuel cell in the middle sound like the place to be that way you only loose rear percent as you burn fuel and it wount afect cross or left side weight

racer17j
Dirt Forum Champ
Total posts: 5390
posted November 16, 2004 09:22 PM  
We just had our rules changed from mounting the battery anywhere to having to install it under the hood only.Seems kinda stupid to me?As for the cell we run it in the center.Have heard about mounting it to the far right so when you burn off fuel and the track dries out it puts wedge back into the car.Never tried it that way.

akadirtracer7
Dirt Freak

Total posts: 217
posted November 17, 2004 11:01 AM  
I run my cell center and high,battery is mounted right over the axle in a tray so I can move it side to side if needed.I add weight to the left rear.Far as the battery not in by the driver as 17j said acid burns if it gets on you.I have heard of the rollover spill.Also have seen a few batteries blow at the track good thing they weren't in the drivers compartment need I say more.

Mikey14
Dirt Freak

Total posts: 265
posted November 17, 2004 03:04 PM  
Run two pieces of cage tubing between frame rails just wide enough to fit the fuel cell. Mount the fuel cell to that tubing to using weight hangers and 1x1 stock. Then you can move the cell where ever you need it.

Our rules require that the battery is in the trunk. mines right over the right rear.

gahainsey
Dirt Maniac

Total posts: 113
posted November 18, 2004 05:01 AM  
Does it add wedge or decrease it as fuel burns on a right side mounted cell? Do some experimenting with your scales and some ballast. As the fuel burns it raises the right corner decreasing wedge. Try it some time.

marshalr
Dirt Maniac

Total posts: 148
posted November 18, 2004 06:40 AM  
With the Fuel Cell over the RR the car gains crossweight as the fuel burns off, theorettically as the track is getting drier and drier.
I must add this technique is probably more for people with very light late models burning alcohol. In a street stock you are not going to notice much change burning off 3 or 4 gallons in a 30 lap main.
My fuel cell slides on a frame as some have mentioned previously. I keep it on the left most of the time

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Some People Race For A Living; I Live To Race

Mikey14
Dirt Freak

Total posts: 265
posted November 18, 2004 07:18 AM  
4 gallons burned off would be about 34 pounds lost.
However, That would translate to more weight off of the right rear since its weight behind the axle's pivot point and acts as a lever. What do you think, about 2% change max at the right rear on a 3300 lbs car?


marshalr
Dirt Maniac

Total posts: 148
posted November 18, 2004 09:30 AM  
I think you are using water's weight in your calculations.
Rule of thumb in my shop is that race gas weighs 6.5 pounds per gallon.
A 2% change on the 3300 pound car would be 66 pounds or a little over 10 gallons of fuel.

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Some People Race For A Living; I Live To Race

redneck racing
Dirt Forum Champ
Total posts: 860
posted November 18, 2004 10:29 AM  
My cell is centered to the back, 16 gallon the battery is mounted in the trunk to the leftoff of the cell mount. Ive seen some cells mounted to the right instead of the left, in my research unless you can move it the best place is center. Eddie

Ego Racing
Dirt Forum Champ
Total posts: 724
posted November 18, 2004 12:20 PM  
As a track dries or gets slicker you need to loose some left side weight which will allow the weight to transfer to the right rear and help dig it into a slick track. On our car with it on the scales we get it set so as the cell looses weight we try to loose the same amount left and rear so as the track dries your car adjusts itself. On a dry track you want more wedge and less left side. It is easy on the LM's running alcky but it just takes a little more tim in thecars running gas. Make your mount so you can move the cell front to back and side to side makes it easier adjusting the cell location.

Blind Barney
Dirt Maniac

Total posts: 120
posted November 20, 2004 08:51 PM  
I think I will put the fuel cell about 40% left and 60% right and I'll put the battery box behind the seat on the floor. I am going to get a couple of large hose clamps to go around the battery holding on each cover to help prevent acid leaks in the event of a roll over. When a battery explodes does it need to be able to pop those two covers off to have a less violent explosion? Will an explosion be far worse if I have those two covers clamped on?

racer17j
Dirt Forum Champ
Total posts: 5390
posted November 20, 2004 09:29 PM  
Some guys were saying they don't like spark in the same compartment as fuel and that got me to thinkin.

Driver67R
Dirt Roller

Total posts: 21
posted November 21, 2004 05:44 AM  
some battery explosions are worse than others I ve heard of a battery exploding in a shop and it blew through part of the roof of the shop. so I wouldn't put a battery anywhere inside the drivers compartment.

    

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