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Today I finally got around to changing out the air box thermostat, per the faq instructions. I bought the new part like a month ago and just now got to doing it. I thought it would be one of those things that didn't need doing, but I would do anyway. It turned out to be a good thing I changed it. The old one was failed, locked in the "hot air" position, with the needle-thing pushed in. That is a poor design, in my opinion.
Anyway, here's what it looked like after successfully changing it (this is the new one, at room temperature):
Here it is (the new one) after putting it in the freezer for a couple hours to test it out (good thing I"m an engineer and thought of that :))
The damper door moved without any trouble, with these artificial temperature changes. The worst part was taking apart the air box to change it out.
The next thing is that this means it's been drawing in pure hot air for however long that thing has been broken. Do you think I need a new AMM? It's a Bosch, 1991 non turbo.
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No you do not need a new AMM unless the car runs poorly. Yet, one is crazy not to carry a spare 016, as cheap as they are.
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Well I haven't seen a '91 inthe junkyard yet. All the amm's out there now are the 007.
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"Do you think I need a new AMM? It's a Bosch, 1991 non turbo."
That sounds rare for a '91 700 car. My impression was that all 700 non turbos of that vintage had the Bendix-Siemens Regina FI with REX ignition, which would mean no AMM.
Or is this a 16-valve motor?
--
Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.
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It's my understanding that Regina/rex is the oddball ignition system and pretty rare - like it's found in 1/8 of the 700's or less. Maybe I'm wrong cuz I'm in CA, but I've never seen a car with regina ignition.
And as far as warm air upping your mileage..... most people would say cold air would up it because it would increase power... but I would not say either will definitely improve mileage.
I can see that it may be more consistent to run the same-ish temp intake air all the time, and I could see that warmer air will result in less fuel being injected.... but perhaps you would end up knocking and retarding the timing.
my two cents...
-Will
BTW... that's the first N/A airbox I've seen lol.
--
1990 740 Turbo, on its way to stock specs, maybe beyond
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but perhaps you would end up knocking and retarding the timing.
Now that you mention it, before I took this car apart it was knocking under heavy acceleration. I bet that was because of the hot air. Well now it should be better.
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Most, but not all, 8v's were Regina in the US market... some oddballs here and there, and then there's California with the EGR requirement. Outside of the US, Regina is pretty scarce.
-Ryan
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Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars
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THis one is Bosch. It has EGR. And was brought here under the Tourist and Diplomat sales program in the early 90's by a Canadian military pilot who bought it new in West Germany. Unfortunately it appears to be a Canadian spec car, as it has the DOT type headlights (I think), they are the plastic ones.
I'm in Canada.
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Well here is the only picture I can seem to find that I took from before taking the whole thing apart (it's almost back together now):
You should be able to see the telltale signs of it being a Bosch. It's an 8 valve. Nothing wildly spectacular there, but I'm glad to hear it's sort of a rare animal...
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I just took my out and threw it away!
--
'89 245 'Haga', '77 244 DL
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I didnt know such a thing existed till I saw a little blurb in IPD catalog..so checking mine ..yes was bad and defaulted to the hot air side..Im in S. Florida so I cheated by measuring a nail that would fit in the old valve. and stuck it in. Now the flapper is always open to the cool side. Winter here in S.Fla...nah
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Well we have summer and winter here, so I wanted this thing to work.
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Ditto that. The thing a lot of folks aren't getting with the airbox T-stat is that it isn't solely for a quicker warm up, and it isn't black and white with open and closed, there are shades of gray that keeps intake air at a constant temp.
Warmer intake air will bump up your fuel economy a touch... and even a minor increase can't hurt these days.
-Ryan
--
Athens, Ohio
1987 245 DL 314k, Dog-mobile
1990 245 DL 134k M47, E-codes, GT Sway Bars
1991 745 GL 300k, Regina, 23/21mm Turbo Sway Bars
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If the car is running OK, I wouldn't sweat the AMM.
Even with Winters, This Airbox T-stat is a USA/Emissions joke. The idea was to steal some hot air from the exhaust manifold to help the car warm up quicker. I have had mine out for a few winters now, it does not affect the cold running of the car and I do not see the Temp gauge in my car coming up to Temp any slower now that this Short term hot air system is eliminated. What I do know is that my AMM is safe.
--
'75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm
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