fuel / gas usage

[Marishka]

Yeah your prob right Russell,
I recon i will cut the floor,
How do you know if a cam or lifters are stuffed?

[phullbore]

My truck runs a 308 on straight gas, bit of a cam trimatic and 3.55 diff gears. The previous owner told me he'd worked out consumption at 25l/100km which is a little more than Skippy's 253 uses - a bit less than yours. He took me for a test drive when I was buying it and he pretty much held it flat most of the time, hard acceleration, late braking and all the things you don't do for economy. He told me that's how he always drives.
I haven't done the sums myself yet but I reckon I do a lot better than him, driving sedately... most of the time . Most of my driving is around town which doesn't help either.
I reckon the overdrive will improve things for you for sure

Phil

[Sammy]

lol .... did he wonder why it used so much fuel ??

[NEBS]

There is a company here in South Africa that manufactures a throttle body and fuel injection stup that replaces the 4 barrel square bore carb on any V8. The distributor also gets replaced by an electronic setup and fuel management system, making it tuneable on your laptop. A friend running a 383 stroker Chevy with Turbo 400 box and 3.08 diff. has this setup replacing a 750 double pumper Holley. He saw 17% improvement on performance and a fuel consumption of 10km/l. at 125km/h. That is with a 250kw (335hp) in a '72 Camaro. Not sure what your exchange rate is, but might be worth looking into.

[Sammy]

yeah holley used to make a "pro-jection" kit that sounds similar to that .... not sure if they still make it or not though but I have seen a few carby style EFI options for older motors.

[johnb44]

im looking at the edelbrock e street efi system at the moment as it looks the goods

[ben]

just on the 6 vs 8 talk, when i replaced the 6 with a 253 trimatic in my van i saw a fairly substancial improvement with fuel econ. the 6 was tired and the 8 is not bad but its not a new motor and blows a tiny bit of blue smoke occasionally but i was quite impressed that i get better econ, same diff ratio 3.5 i have a 3.08 to put in it at some point to hopefully improve econ again. i do like the towing grunt it has with the 3.5 thou.

ben

[wendyh]

Our 202 with genie extractors with standard carbi inlet manifold gave us 23 liters per 100km at average 115 km/hr
then Ray modified an EFI inlet manifold with same extractors and we got 17.5 litres per 100km at average 115km/hr
we now have both modified inlet and exhaust manifolds on the 202 with a turbo added to the mix...
we are yet to work out the LPG usage ...havnt been on an road trip yet...i feeel it may be reduced a bit more ...will update as soon as we work it out