Forum: Hypermiling
08-08-2011, 02:53 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Yup, I got his book from the library. He's also active on a Buick forum I sometimes use.
So, seeing this thread reminds me...I acquired a numbers-matching carburetor and took it apart. I can't...
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Forum: Hypermiling
07-08-2011, 05:52 AM
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Replies: 41
Views: 11,188
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Forum: Hypermiling
07-07-2011, 08:07 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Hmm...so, do you think I might do better to stay at 5in/hg than to open it up the rest of the way? There is a definite increase in power, and power piston level is the same, but I can't say for sure...
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Forum: Hypermiling
07-07-2011, 05:46 AM
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Replies: 41
Views: 11,188
How am I doing?
So, here's the strategy I've worked out and the information I know. It seems to work well.
https://i51.tinypic.com/2ql8wmp.jpg
At 10-7 in/hg, often I can back off just enough to reach 11 and...
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Forum: Hypermiling
06-08-2011, 04:12 PM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
I just found this, from another manual, in my notes:
"On M4ME models a remote vacuum source is used to operate the spring-loaded power piston instead of the conventional manifold vacuum source. A...
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Forum: Hypermiling
06-08-2011, 06:35 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
So I've been reading up on Quadrajets. I've got more material from different sources to read yet, but I did come up with this bit:
"On some Q-jets, two springs are used beneath the power piston. The...
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Forum: Hypermiling
05-11-2011, 05:56 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Sometimes, or maybe all the time, my needle shakes like the movement demonstrated in scenario 3 (but not at that level). Does that mean anything?
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Forum: Hypermiling
05-06-2011, 05:45 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Thanks, I was going to ask about that...there are situations where I'm not sure whether low RPM at low vacuum and presumably rich mixture is worse than higher RPM with higher vacuum.
Turns out...
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Forum: Hypermiling
05-05-2011, 02:02 PM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Good news, everyone!
I moved the distributor advance to ported vacuum and the vacuum gauge to manifold vacuum (as reported in more detail in my spark plug thread).
Now:
- the vacuum gauge...
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Forum: Hypermiling
05-04-2011, 05:19 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
I'm going to try both the one that I think is ported vacuum (which was previously one of the two simultaneously in use for it) and good manifold vacuum.
I may do some A-B-A if they both drive well...
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Forum: Hypermiling
05-03-2011, 02:51 AM
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Replies: 41
Views: 11,188
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Forum: Hypermiling
05-02-2011, 06:08 PM
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Replies: 41
Views: 11,188
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Forum: Hypermiling
05-02-2011, 04:44 AM
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Replies: 41
Views: 11,188
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Forum: Hypermiling
05-01-2011, 03:20 PM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
This is where it's currently hooked up. This thing has 3 nipples and a rubber boot that fits all 3, combines the outer two into one, and sends the middle one to the distributor (formerly, to the...
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Forum: Hypermiling
05-01-2011, 02:42 PM
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Replies: 41
Views: 11,188
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Forum: Hypermiling
05-01-2011, 05:22 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
No, it stays up when the engine is off. I expected it to drop immediately. Even after five minutes it's not totally down.
I haven't tried free-revving with the gauge.
I'll have to get a closer...
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Forum: Hypermiling
05-01-2011, 02:44 AM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
If it continues behaving with the high, non-fluctuating numbers, what would that mean? Something wrong with engine, or it's just a design that runs abnormally high vacuum?
Could I potentially have...
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Forum: Hypermiling
04-30-2011, 06:12 PM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
Squeezing FE out of modern fuel injection is pretty much the opposite of a carburetor. Efficiency goes way down when you lose vacuum. With a carburetor there's no way to get better FE by getting rid...
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Forum: Hypermiling
04-30-2011, 05:30 PM
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Replies: 41
Views: 11,188
Re: How to use vacuum gauge for FE?
I'll have to keep driving and see if I ever get down to 8 or less. I didn't try a lot of different conditions in my short drive this evening, just 45-50mph the whole way, no hard acceleration, and...
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Forum: Hypermiling
04-30-2011, 02:15 PM
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Replies: 41
Views: 11,188
How to use vacuum gauge for FE?
Ok, I've finally added a vacuum gauge to my 1980 Buick.
In a short drive (16 miles round trip) I found it to be very steady. I was expecting much more action. It mostly stayed at 20, 21, or 22,...
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