What does the inside of these things look like? are there baffles? if your 1/2 full do you have 40+ liters sloshing about. With the extra weight do you need to re-balance the car? What does the extra weight, and where it is, do to the polar-moment?
What does the inside of these things look like? are there baffles? if your 1/2 full do you have 40+ liters sloshing about. With the extra weight do you need to re-balance the car? What does the extra weight, and where it is, do to the polar-moment?
Richard
70T 3.2 Max Moritz GP White
74 BMW 2002tii Inca
54 Ford F100 Two Tone
I don't believe there are any baffles in the 85 liter tanks, at least I've not seen them in mine. But then again there aren't any in the 62 liter tanks either, and I've not noticed gas sloshing in either one. I also have a 67 with a 100 liter tank, aftermarket made, but it has baffles. I don't know if the original steel factory ones did. I have a original 100 liter plastic one that does not have baffles. One advantage I notice with the 100 liter tank in my 67 is that when over half full it sure keeps the front of the car planted, no short wheelbase wandering!
Early S Registry member #90
R Gruppe member #138
Fort Worth Tx.
Do you mean re-balance as in corner balancing? Are you talking about a street car or race car?
As for the polar moment: I'm not sure I see why this conversation involves Christmas.
Why does it bother me to think of 10.5 gals. of 93 oct sloshing around. Is that added weight in a good place? does it move enough to worry about? Is the "moment" effected by moving liquids?
Richard
70T 3.2 Max Moritz GP White
74 BMW 2002tii Inca
54 Ford F100 Two Tone
Free surface effect and metacentric stability are critical when operating ships, but I don't think the volume and weight of these tanks would seriously effect the handling of a car...
John Forcier
EarlyS #1987
1968 911 Race Car "Grun Hilda"
1969 S/T interpretation "Blau Healer"
Restoration Saga
It's no more of a problem than it would be in any of your cars, which don't have baffles either. My 93 Chevrolet pick-up has a 34 gallon tank that isn't baffled either. The only evidence of slosh is the fuel level gauge reading changes with acceleration and braking. No doubt baffles might be a better construction.
Early S Registry member #90
R Gruppe member #138
Fort Worth Tx.
I would not be nearly as worried about the fuel tank as much as I would the effects of a 220+ lb friend in the passenger seat with beer sloshing around inside of him. Especially if I intentionally tried to scare him.
Forget polar moment, I would be far more concerned about a messy moment.
I agree, the only difference I feel is in the volume/weight.
My set-up was done with no spare and 2/3's of a tank of gas...... and damn if that's not RIGHT where the car feels the best....
Never thought about sloshing gas, however did run under a 1/4 tank at the track a couple of times and was hoping for some sloshing to feed that pump..... man my old MFI car doesn't like that.............. live a learn
Last edited by Chuck Miller; 04-20-2012 at 04:47 AM.
Chuck Miller
Creative Advisor/Message Board Moderator - Early 911S Registry #109
R Gruppe #88
TYP901 #62
'73S cpe #1099 - Matched # 2.7/9.5 RS spec rebuild
'67 Malibu 327 spt cpe - Period 350 Rebuild
’98 Chevy S-10 – Utility
’15 GTI – Commuter
BingoOriginally Posted by Frank Beck
1 US gallon of gasoline = 6.073 lbs
A chubby passenger jumping around in the cab will do more to upset the car (and me!) than a few extra pounds of hi-test out over the front tires
Under half a tank at the track my stock 911 tank would lose fuel pick up in sweepers...
A baffled fuel cell fixed that.
I would think tank bafflles are to improve fuel pick up, not to slow fuel sloshing/weight transfer.
Last edited by Gburner; 04-20-2012 at 08:36 AM.
Posting Permissions
Reply With Quote
