Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
Mike Kamm
Registered user
Global user
Registered: 07-2004
Location: Averill Park, NY
Posts: 5583
Karma: 18 (+19/-1)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
Nice work Bill. 
Glad to see I'm not the only one who is really prepping his car. A good working mechanical advance [and vacuum advance if your car has it] are both key for best economy. I'd jack the timing up and run some airplane fuel too. 
Too bad about the bias ply tires [but I understand they are period correct].
Checking your mixture with an O2 sensor system, very nice! What system do you have? Is it a wide band?
|
|
8/3/2009, 9:52 pm
|
Send Email to Mike Kamm
Send PM to Mike Kamm
|
Mike Kamm
Registered user
Global user
Registered: 07-2004
Location: Averill Park, NY
Posts: 5583
Karma: 18 (+19/-1)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
I just got back from some much needed testing/tuning today. I drained all of the E10 out of my B210 at home and splashed 2.5 gallons of ethanol free 93 premium in it. This was more than enough to get out to Fairway Gas and Oil in Fonda. I then filled up with that great smelling av-gas at Fairway, jacked up the ignition timing, and installed the short belt to eliminate the alternator. This was the main reason for the drive today, to see if I could make the 100 or so miles on the deep cycle battery. The answer is yes. No problem at all. I tested the battery surface voltage at Fairway before I left and it was 12.7 volts. I stopped at the half way point of the run and it was 12.4 volts. It was getting dark when I pulled into Mobil and the battery was still at 12.2 volts. I probably could have driven it all the way home [another 58 miles] but as headlights were now needed I hooked the alternator back up and drove it home with bright lights.
Speaking of testing and O2 sensors, I reinstalled my Innovate LM1 wide band setup to see if I could lean the carb a bit more with the new plugs. It's a good thing I did. The engine was running richer in today's hot 85 degree air [as opposed to the October air I jetted for last year]. I had the air/fuel ratio set for 14.7 to 1 - 15 to 1 back then, but today it was 13.8 to 1 - 14.4 to 1. You fuel injected guys don't have to worry about stuff like this as your ecu adjusts your mixture constantly, but us carb guys have to keep checking and adjusting as the seasons change to stay spot on.
All I can say is that it's a good thing I didn't wait until the last minute to get ready.
Here's a pic I took while stopping off in Wells at the state boat launch ramp.
|
|
8/3/2009, 11:06 pm
|
Send Email to Mike Kamm
Send PM to Mike Kamm
|
Bill Clark
Registered user
Global user
Registered: 09-2008
Posts: 10
Karma: 0 (+0/-0)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
re: what sensor
I just cut the bung and four wire sensor off an old car in the u-pick-it junk yard and welded the bung into my header. I wired the sensor into a guage from Auto Zone and the heater into my switched 12V. $39.00 total. It is pretty crude (as is the Zenith carby) and of course the display jumps around a lot, but I can see trends and can recognize a change with the smaller jet.
Bill
|
|
8/4/2009, 6:07 am
|
Send Email to Bill Clark
Send PM to Bill Clark
|
ZX2 2000
Registered user
Global user
Registered: 07-2004
Posts: 1091
Karma: 5 (+5/-0)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
A little trick we used to do on the old VW Beetles. Instead of setting the timing at idle.We set the timing at max advance at what ever rpm that came in. It used to run around 32 degrees as I recall. Made a huge difference.
---
Dick Vedder
|
|
8/4/2009, 8:44 am
|
Send Email to ZX2 2000
Send PM to ZX2 2000
|
Mike Kamm
Registered user
Global user
Registered: 07-2004
Location: Averill Park, NY
Posts: 5583
Karma: 18 (+19/-1)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
Yes indeed, that's known as the "total advance" setting. I've always tuned my race engines that way. For my Datsun, I've simply gone from the standard setting of 10 btdc, and worked my way up to 16 btdc. You've got me curious now to check what total advance I am running in my B210 now. I will check it during the upcoming carb rejet/tuning session.
---
You think of air as flowing over your car at speed, right? Actually, you're ramming into it and shoving it out of the way-punching a hole through a wall of fluid that weighs about 0.08 pounds per cubic foot. -David Freiburger
|
|
8/4/2009, 9:34 pm
|
Send Email to Mike Kamm
Send PM to Mike Kamm
|
Mike Kamm
Registered user
Global user
Registered: 07-2004
Location: Averill Park, NY
Posts: 5583
Karma: 18 (+19/-1)
|
|
Reply | Quote
|
|
Latest secret weapon........
Might as well pull out all the stops at this point. I bought three quarts of this today. Notice I said three quarts, not four as the engine calls for. Running with a full crankcase of oil sloshing around causing parasitic drag on your crankshaft in an economy run makes no sense to me.
The price has come down on it recently. They are $6.99 at Auto Zone.
---
Enemy #1: Air resistance - it fights you coming and going, pushing against the nose of the car as you compress it then leaving a low-pressure wake that sucks backward on the tail. That's all bad. -David Freiburger
|
|
8/5/2009, 6:13 pm
|
Send Email to Mike Kamm
Send PM to Mike Kamm
|
toga94m
Registered user
Global user
Registered: 10-2008
Posts: 23
Karma: 0 (+0/-0)
|
|
Reply | Quote
|
|
Re: Latest secret weapon........
I was just thinking about the msitake I made when I changed the oil last night.. put in Valvoline Maxlife blend because it was on sale (5qt+Pure1 filter=$19.25! at Advance Auto) but it's not ultra-high efficiency. Oh well. I'll fold in the rearview mirrors before the run to compensate. They're electric adjustable so I don't want to mess with removing them completely, and taping over the hole.
On the bright side, I backed into a bush with the power antenna up a month ago, so the bent antenna is now removed - less drag. Didn't use the radio anyway. I bet lots of aero improvements could be made by replacing the soft top with a hardtop, or a homemade top that's more aerodynamic than either. I'd lose access to the trunk for the trip though.
And I've got the secret weapon of not having to slow down for sharp curves around Ephrata, depending on who I end up behind. Miata = gokart in the corners. 
Last edited by toga94m, 8/5/2009, 8:20 pm
|
|
8/5/2009, 8:16 pm
|
Send Email to toga94m
Send PM to toga94m
|
toga94m
Registered user
Global user
Registered: 10-2008
Posts: 23
Karma: 0 (+0/-0)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
I did a preview of the route yesterday - it was too nice a day to stay in an office with idiots.  The GPS odometer said 104.04 miles at the end vs. Mike's 104.0, but the GPS and I wandered a bit at a rest area along the way, so it's probably a tiny bit less than 104 station-to-station.
As I mentioned in the group email, it's easy to miss the left turn to drive along Caroga Lake. I almost did it again, despite being down to about 28mph when I found the turnoff. Oh, and there's a ferris wheel at the northern end of the road, between the lake and the road.
One other thing that might be a concern.. In Ephrata there are a few sharp corners on a downhill coast, and I was looking forward to not using brakes here, holding onto my momentum. Last year I came up behind a less-stable vehicle and had to slow down. This year, I had to stop for a vehicle headed for a stable - a horse-drawn buggy, complete with orange triangle on the back. And within a mile or two there was another one. Naturally the cart appeared halfway around a blind turn, so it was a surprise, but not dangerously so.
This preview trip was part 1 of an experiment - Miata with convertible top down. I definitely got less mileage than last October's trip, but I can't really compare them because of the different routes. I'll know better how much the turbulence affects mileage after this year's official run.
tom
|
|
8/8/2009, 8:55 pm
|
Send Email to toga94m
Send PM to toga94m
|
Mike Kamm
Registered user
Global user
Registered: 07-2004
Location: Averill Park, NY
Posts: 5583
Karma: 18 (+19/-1)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
Thanks for the updates Tom. Were you using the route instructions from last year? If so, then the mileage to the turn for the road along Caroga lake was there to let you know when to turn. It also mentions the Amish buggies. Dave Burnham [or was it Bryon Seyfried?] wrote those directions and covered it all very nicely.
It will be interesting to see how much better your mileage will be with the top up.
---
Enemy #1: Air resistance - it fights you coming and going, pushing against the nose of the car as you compress it then leaving a low-pressure wake that sucks backward on the tail. That's all bad. -David Freiburger
|
|
8/8/2009, 9:10 pm
|
Send Email to Mike Kamm
Send PM to Mike Kamm
|
toga94m
Registered user
Global user
Registered: 10-2008
Posts: 23
Karma: 0 (+0/-0)
|
|
Reply | Quote
|
|
Re: AMEC Economy Run III August 23rd
I had the directions, but my odometer disagreed with yours, because of the non-factory-size tires I have now. The GPS odo was much closer, but harder to glance at. I was glancing at it as I approached Caroga Lake, but had it zoomed in too closely and had to pay attention to the road again.
I haven't been able to find any test numbers on the internet to say how much worse the drag is with the top down. Last year was a hair over 40mpg, this trip was 35.5, so more than 10% loss, assuming the last bit thru Johnstown to the starting point averaged the same. There's more elevation to drop = coasting, but it's busy traffic-light traffic = stop-n-go.
|
|
8/8/2009, 9:56 pm
|
Send Email to toga94m
Send PM to toga94m
|
Add a reply
Page: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40
41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59
|
You are not logged in (login)
Board's time is: 11/30/2009, 11:40 am
|
|
|
