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Mike Kamm
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Re: Heavy flywheel?
quote:
Mark Long wrote:
I think light is good for economy. The Honda vx is a special high mpg car, and has a lighter flywheel than a standard Civic. The car would weigh slightly less. I plus it is easier to keep spinning. I think the car manufactures make the flyweel heavy so the car is easy to smoothly get off the line.
Honda's high mpg cars always had lighter than usual flywheels.
Thanks very much Mark. Everyone on the Datsun forums is telling me I want the heaviest flywheel I can get. I don't understand why they think that?
But if Honda uses a lighter one, so will I! 
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9/27/2008, 10:23 pm
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itjstagame
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Re: AMEC Economy Run II and Go-Kart Challenge
I can't think of an example where a heavier flywheel would help FE. It does help with momentum and climbing of hills maybe and make it easy to spot slight grades and other things with an underpowered car as you will have to alter throttle more.
But certainly if using P&G lighter is better because any extra inertia is obviously wasted during EOC and lighter will provide more power to acceleration during the pulse.
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9/28/2008, 3:33 am
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Bill Clark
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Re: AMEC Economy Run II and Go-Kart Challenge
I'm really looking forward to this. I signed up planning on a nice ride in the Park and understimated the dedication this group has to the task at hand. I'm still not planning to do much to my Met but it will provide a benchmark for 1960. In 1972 I got to participate in the follow on to the Clean Air Car Race, the Urban Vehicle Design Competition where 100 colleges took cars to the GM proving grounds in Warren and tested for a week. Our entry from Georgia Tech was a Mazda R100 converted to Natural Gas (the gas company was our sponsor), we added anti skid brakes and other improvements and cut a foot off the back to make is shorter. All the electric cars were recharged at night by a smokey diesel generator and all us hydrocarbon powered cars successfully lobbied to force the electric cars to get zero points for emissions. As I remember correctly, not one of the 100 cars in the group met the 1974 emissions standards. Since then, with some public proding, engineers and people like this group, not people with signs, have grossly reduced emissions while improving mileage. One of the comments people often rant about is the great gas mileage the old cars got. The newer cars will do much better than I will with a fraction of the emissions and will be much safer with equivalent weight. It would be fun to do an emissions test on these rigs as part of the run.
Bill
60 Met
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9/28/2008, 9:18 am
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Mike Kamm
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Re: AMEC Economy Run II and Go-Kart Challenge
Welcome to the forums Bill. 
That's interesting that you participated in the Clean Air Car Race back in '72, with a rotary powered R100 no less! Those are so rare today.
By the mid to late 70's the sub-compacts were getting good mileage for sure. As far as emissions, my '77 B210 has a ton of emission equipment on it. Nissan/Datsun did a great job with their engineering in keeping up to the standards. Their powertrains were very reliable too. My reasoning for why the B210's [and other foreign sub-compacts of the day] got such good mileage is because of their very low weights. These cars were truly small and were not weighed down with air bags and strict crash standards. Most had tiny 12" and 13" wheels, not the gigantic [and heavy] wheels and tires you see today.
What I am about to embark upon is seeing what one of these early cars can do if driven with fuel mileage in mind. I have not seen one of these cars hypermiled before. That should make a car that gets good mileage, great mileage.
Well if I want my B210 to make this event, I better get back out into the garage and finish lapping the valves on my ancient economy powerplant. 
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9/28/2008, 10:59 am
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Mike Kamm
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Re: AMEC Economy Run II and Go-Kart Challenge
Progress report:
Spent today tearing down and rebuilding this weathered looking A14 engine. Some might say it looks like it was pulled from the hull of the Andrea Doria. I even had to braze up a rusted pinhole in the oil pan.
At the end of the day it is about ready to go into the car.
Normally I'd polish all of the pulleys and paint every little part, but heck I've not got the time for that now.
I must say that it was not only a peasure to work on such a simple old school engine but also a nostaligic throwback to my early days at the Datsun dealer.
......man, cars were so simple back then.
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9/28/2008, 8:18 pm
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Mike Kamm
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Re: AMEC Economy Run II and Go-Kart Challenge
I thought some of you might find this humorous. While assembling my B210 engine, I chose to reuse the original 32 year old crankshaft oil seals because they looked ok, and are certainly "looser" than new ones. Same with the valve seals. They were not brittle so I left them on. I purposely did not remove the pistons and hone the cylinders because that just adds drag to the recprocating assembly. I don't have time for break in miles. You can grab the crank pulley [with the plugs out] and easily spin it over by hand.
I just hope this thing doesn't have a cloud of blue smoke following it.
.....bought a hot 195 degree thermostat too. 
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9/29/2008, 12:29 pm
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ZX2 2000
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Re: AMEC Economy Run II and Go-Kart Challenge
Are you going to advance the timing so that it rattles a little on acceleration ?
---
Dick Vedder
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9/29/2008, 5:17 pm
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Mike Kamm
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Re: AMEC Economy Run II and Go-Kart Challenge
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ZX2 2000 wrote:
Are you going to advance the timing so that it rattles a little on acceleration ?
I panned to advance it as far as I could until it pinged a bit and then back it off a tad. Should I leave it there and let it rattle a little?
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9/29/2008, 5:44 pm
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ZX2 2000
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 Re: AMEC Economy Run II and Go-Kart Challenge
Mike, I'm sure pinging/detonation is not condusuive to good mileage. We used to advance the timing until it rattled a little under full throttle a low rpms.
So in your "eco" engine are you going to use a light synthetic oil,0w-20 ?
Are you going all out in replacing wheel brng grease with oil. Lighter oil in the transmission and differential, back the brakes off a notch ?
Inquiring minds need to know
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Dick Vedder
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9/30/2008, 8:14 am
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itjstagame
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Re: AMEC Economy Run II and Go-Kart Challenge
Yeah, that's a very important one, if you spin your wheels with the car jacked how long do they spin for? My friend used to replace the Festiva's wheel bearings about every 10k miles because he could feel the difference. His wheels spin forever if you give them a tap.
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9/30/2008, 9:12 am
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