Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

[milner351]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

That's it Joe - you're a wise man - Reid Vapor Pressure, RVP, the light hydrocarbons are required in winter for cold start, the same would be too prone to vapor lock and rapid evaporation in the summer.

[squirrel]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

but RVP doesn't affect energy content of the fuel.

Diluting gasoline with alcohol, does.

[DanStokes]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

Yu guys got the RVP thing right. One of my projects at EPA was to build a portable RVP tester and I know more about this than I wanted to. If you want more info PM me.

Jim, as usual, hit it right on. The energy density of alcohol (any alcohol) is less than gasoline so it takes more to do the same work. Conversely, the energy density of Diesel fuel exceeds that of gasoline, hence the better efficiency. So it takes more fuel to take your car the same distance but it pollutes less per mile. I'm guessing there's a crossover somewhere.

Dan

[milner351]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

diesel's advantages are not confined to fuel energy density.

don't forget the fact that there is no throttle - therefore no throttle losses.

throttling / pumping losses of a large gas engine at low throttle angles cruising down the highway are significant.

This is one of the biggest reasons diesel HD trucks get so much better fuel economy than a gas engine of similar output.

[TheSilverBuick]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

diesel's advantages are not confined to fuel energy density.

don't forget the fact that there is no throttle - therefore no throttle losses.

throttling / pumping losses of a large gas engine at low throttle angles cruising down the highway are significant.

This is one of the biggest reasons diesel HD trucks get so much better fuel economy than a gas engine of similar output.

I'm going to say also higher compression ratios compound that.

(having a low vacuum cam with a relatively low rpm power band is what I'd like to try on the skylark to reduce pumping losses, unfortunately I ate two of the one I want to try :'()

[milner351]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

I figured that went without saying.

BTW - pulling my 3600lb trailer with the ranger on it behind Lee's Limo was gorgeous - I left my friend with is lighter trailer with a 68 mustang on it, pulled by a V10 van way way back - and I was only at half throttle.... still over 16mpg combined with lots of in town driving too.

[DanStokes]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

Absolutely, John - but I was confining the discussion to fuels as that was the topic on the table. Pumping losses are, of course, a HUGE deal. A couple of Diesel notes - we did a gross experiment at EPA (think clipboard) on an old MB Diesel and found MUCH lower PM (particulate matter) emissions when the intake was throttled during decel on the chassis dyno. Also, are the new DI Otto-cycle engines throttled? Doesn't seem like they would need to be and it should drop pumping losses a ton. Thoughts rattling in head.....

Dan

diesel's advantages are not confined to fuel energy density.

don't forget the fact that there is no throttle - therefore no throttle losses.

throttling / pumping losses of a large gas engine at low throttle angles cruising down the highway are significant.

This is one of the biggest reasons diesel HD trucks get so much better fuel economy than a gas engine of similar output.

[TheSilverBuick]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

Absolutely, John - but I was confining the discussion to fuels as that was the topic on the table. Pumping losses are, of course, a HUGE deal. A couple of Diesel notes - we did a gross experiment at EPA (think clipboard) on an old MB Diesel and found MUCH lower PM (particulate matter) emissions when the intake was throttled during decel on the chassis dyno. Also, are the new DI Otto-cycle engines throttled? Doesn't seem like they would need to be and it should drop pumping losses a ton. Thoughts rattling in head.....

Dan

Unless they can throttle it with the valve timing it still needs the air throttled because the narrow range fuel burns in for power and emissions. Unless they can make the gas will burn significantly more lean and not hot enough to make excessive NOx. John?

[squirrel]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

We need to put a diesel in Scotts caprice so this little discussion will be on topic

[DanStokes]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

We did kinda wander off topic, didn't we. Maybe a new thread?

Dan

[JOES66FURY]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

of topic in 5, 4, 3...... LOL, I have seen forums who ban members for this kind of stuff...dudes boohooing and crying all over the palce about off topic...


Whats next on the honey do list for the luxo-barge Scott?

[squirrel]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

I hope he needs to get a few thousand miles on the engine so he can make sure it's all properly broke in, and the tires are properly smoke conditioned

[Scott Liggett]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

of topic in 5, 4, 3...... LOL, I have seen forums who ban members for this kind of stuff...dudes boohooing and crying all over the palce about off topic...


Whats next on the honey do list for the luxo-barge Scott?

I'm going to do what was planned to be done first and got way layed by all the fun stuff. Rebuild the front suspension and replace the front springs.


I was going to suggest we get back on topic, but you guys beat me to it. No worries.

[JOES66FURY]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

of topic in 5, 4, 3...... LOL, I have seen forums who ban members for this kind of stuff...dudes boohooing and crying all over the palce about off topic...


Whats next on the honey do list for the luxo-barge Scott?

I'm going to do what was planned to be done first and got way layed by all the fun stuff. Rebuild the front suspension and replace the front springs.


I was going to suggest we get back on topic, but you guys beat me to it. No worries.

are you going to pretty up the pieces? ha-ha, never mind..I know better...I should ask...are you going to powder coat and or sand blast anything or just clean it up and shoot it with spray bomb....I would like to see some pics of the rebuild..I have to do the car at some point...I have done the truck but never did a front end in a car...the ball joints worry me...

[Scott Liggett]

Re: Rebeldryver's '70 Caprice Granny's Luxo-Muscle-Barge

Ball joints are easy. I already did the lowers not long after buying the car. The uppers are still original which means they are riveted on.

I'll doubt I'll do a ton of cleaning and painting under there. But, we'll see what my mood will be like when I get under the car. I do know I won't be powdercoating.