Zero compression & weber
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Zero compression & weber
Hello,
This is my first post, though I've been lurking for a couple of weeks since I bought my tercel. So consider this a bit of an introduction as well as a solicitation for advice.
I've been looking for a Tercel or Corolla All-Trac for a month or so. Early Jan I found an 87 Tercel AWD 5+ speed. It has a nearly perfect body and interior, especially considering the high (235K) mileage. It ran OK, though the seller said it had low compression in one cylinder.
I've pulled the head from a 3AC before - I had an 80 and 82 2WD back when I was a pizza driver. So I wasn't scared to do some head work. I don't want to have to do anything to the block though. Based on the compression I got it for $600.
I've purchased a new compression guage and tested it. 3 cylinders have great compression - 178, 170, and 183 psi. But the number 2 cylinder has zero compression. From what I know, that almost has to be a stuck valve.
Question 1: does anyone out there know of anything besides a stuck valve that could cause zero compression in a cylinder?
I used to have a pickup with a 22R-C, and I put a Weber carb in it when the factroy one went bad. I liked the results a lot, and would like to put one into the Tercel as well.
Since I have to pull the carb as part of the head job, I thought I'd put the Weber in at the same time. Part of me says maybe I shouldn't replace two major components at the same time though. As far as I know, there's nothing wrong with the stock carb.
Question 2: any opinions on whether I should install the Weber as part of the head job?
I've added a poll for question 2. Hope I set it up correctly.
Thanks,
Eric
This is my first post, though I've been lurking for a couple of weeks since I bought my tercel. So consider this a bit of an introduction as well as a solicitation for advice.
I've been looking for a Tercel or Corolla All-Trac for a month or so. Early Jan I found an 87 Tercel AWD 5+ speed. It has a nearly perfect body and interior, especially considering the high (235K) mileage. It ran OK, though the seller said it had low compression in one cylinder.
I've pulled the head from a 3AC before - I had an 80 and 82 2WD back when I was a pizza driver. So I wasn't scared to do some head work. I don't want to have to do anything to the block though. Based on the compression I got it for $600.
I've purchased a new compression guage and tested it. 3 cylinders have great compression - 178, 170, and 183 psi. But the number 2 cylinder has zero compression. From what I know, that almost has to be a stuck valve.
Question 1: does anyone out there know of anything besides a stuck valve that could cause zero compression in a cylinder?
I used to have a pickup with a 22R-C, and I put a Weber carb in it when the factroy one went bad. I liked the results a lot, and would like to put one into the Tercel as well.
Since I have to pull the carb as part of the head job, I thought I'd put the Weber in at the same time. Part of me says maybe I shouldn't replace two major components at the same time though. As far as I know, there's nothing wrong with the stock carb.
Question 2: any opinions on whether I should install the Weber as part of the head job?
I've added a poll for question 2. Hope I set it up correctly.
Thanks,
Eric
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It could be a blown head gasket too? Either way, it sounds like you'll be pulling the head off anyhow. Pull the head, clean it up, get it resurfaced, check the valves etc., replace it with a new gasket.
I'd put the weber on a the same time if I was you. You can't really go wrong. It gets rid of all the emissions and vacuum lines (except for the ignition advance vacuum). There are a number of us with this carb on their cars on this forum; so if anything goes wrong, we can give you help.
I'd put the weber on a the same time if I was you. You can't really go wrong. It gets rid of all the emissions and vacuum lines (except for the ignition advance vacuum). There are a number of us with this carb on their cars on this forum; so if anything goes wrong, we can give you help.
Current:
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
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Make sure you get the DGEV variation. It has electric choke which is easier to use than a water or manual one. Also, it faces the right direction. You'll need to get an adapter kit too, and a low profile air filter. I ordered direct from Redline/Weber in the US.sandshadow wrote:Thanks - I think I'll go ahead and install the Weber at the same time.
Checked in at a local parts shop I like and it was well over $500. I found it online for $417.
Current:
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
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- Newbie
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- Joined: Sun Jan 15, 2006 10:10 pm
I've ordered the carb and kit. It's the 32/36 DGEV with the low profile air filter. $420 incl shipping.
Did you install a fuel pressure regulator as well, or an external fuel pump? Weber suggests it and I remember someone's post saying they were blowing all their seals with the stock fuel pump. If so, what did you go with?
Thanks
Did you install a fuel pressure regulator as well, or an external fuel pump? Weber suggests it and I remember someone's post saying they were blowing all their seals with the stock fuel pump. If so, what did you go with?
Thanks
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- Location: Victoria BC, Canada
I've left the stock fuel pump in my car and have had no issues thus far. That said, maybe I've missed something and should have installed a different fuel pump. Is it possible to install a fuel pressure regulator with the stock fuel pump and not have a fuel return line back to the tank?sandshadow wrote:I've ordered the carb and kit. It's the 32/36 DGEV with the low profile air filter. $420 incl shipping.
Did you install a fuel pressure regulator as well, or an external fuel pump? Weber suggests it and I remember someone's post saying they were blowing all their seals with the stock fuel pump. If so, what did you go with?
Thanks
Current:
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
I THINK the pump is designed to regulate pressure and flow and then dump the rest of the gas back to the tank. Guess you'd need to go with electric.
Have heard of using extra regulators and reducing PSI way down to save gas.
Have heard of using extra regulators and reducing PSI way down to save gas.
Give a boy a gun-give a biatch a cell phone-and pretty soon you almost got yourself a police state.
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

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Ah, ok. For some reason I didn't think that the tercel had a return line, but maybe it does.takza wrote:I THINK the pump is designed to regulate pressure and flow and then dump the rest of the gas back to the tank. Guess you'd need to go with electric.
Have heard of using extra regulators and reducing PSI way down to save gas.
I was wondering if lower pressure would affect fuel economy. If I'm running too much pressure, maybe lowering it a bit would increase my economy. Although I think if a person ran too low a pressure, maybe the fuel would not atomize properly? Or the engine would become fuel starved in some situations and cause lean issues?
Current:
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
91 LJ78 Landcruiser EX5
95 A32 Maxima SE
Former:
87 AW11 MR2 Smallport 4AGZE
93 Taurus SHO ATX
86 AL25 SR5 6spd 4wd
90 AE92 GTS
82 KP61 SR5
85 MX73
87 AE86 GTS 4AGZE
85 AE86 GTS
83 AL21
As far as I know, in a carb setup, the fuel pump only dumps fuel into a "bowl" of liquid, where it collects until the sheer effect of the air moving down the carb barrel pulls it out. The venturi effect. You may be surprised how powerful the venturi effect can be... I fly model aircraft on occasion and they have no fuel pumps. The venturi is the sole mover of fuel. No mechanical parts, just a simple high/low pressure situation. You can pull multi-G loops, rolls, etc without going deadstick (engine stall).
So I suppose that as long as you can keep full supply in the float bowl, no stall-outs will occur?
That is to assume I know what I'm talking about....
And yes, there is a return line. If you pull both lines off the pump, the one where there is only a small hole out of the pump is the return.
So I suppose that as long as you can keep full supply in the float bowl, no stall-outs will occur?
That is to assume I know what I'm talking about....
And yes, there is a return line. If you pull both lines off the pump, the one where there is only a small hole out of the pump is the return.
RIP 10-07- 1984 Toyota Tercel SR5 4wd Wagen 6 speed
RIP 04-05- 1986 Toyota Tercel SR5 4wd Wagen 6 speed
1st Terc- 1987 Tercel SR5 4wd Wagon 6-speed, Sadly cubed
1985 Tercel Standard 4wd Wagon w/ 3-speed auto, Living a happy life in Boulder last I knew
RIP 04-05- 1986 Toyota Tercel SR5 4wd Wagen 6 speed
1st Terc- 1987 Tercel SR5 4wd Wagon 6-speed, Sadly cubed
1985 Tercel Standard 4wd Wagon w/ 3-speed auto, Living a happy life in Boulder last I knew
Was just reading this recently where someone was setting up a carb and was using 1 PSI...basically dialed it down as low as he could and where he didn't get any starvation....think it was a 4 barrel too.GTSSportCoupe wrote:I was wondering if lower pressure would affect fuel economy. If I'm running too much pressure, maybe lowering it a bit would increase my economy. Although I think if a person ran too low a pressure, maybe the fuel would not atomize properly? Or the engine would become fuel starved in some situations and cause lean issues?
Give a boy a gun-give a biatch a cell phone-and pretty soon you almost got yourself a police state.
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

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- Newbie
- Posts: 19
- Joined: Sun Jan 15, 2006 10:10 pm
I did a bunch of browsing, searching for info on regulators, etc.
This article was written for Rotary Mazdas but had some good info:
http://www.yawpower.com/fueldel.html
The regulator I liked best is called the "Filter King". It includes a filter and regulator in a single unit (and looks cool).

It would be ~$50 if I were in the UK, but the only place I found in the US that distributes them wants over $100. At that price, I'm better getting a Weber or Holly regulator.
This article was written for Rotary Mazdas but had some good info:
http://www.yawpower.com/fueldel.html
The regulator I liked best is called the "Filter King". It includes a filter and regulator in a single unit (and looks cool).

It would be ~$50 if I were in the UK, but the only place I found in the US that distributes them wants over $100. At that price, I'm better getting a Weber or Holly regulator.
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- Highest Ranking Member
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Finding some good prices on things at Jegs...or at least you can get some info and do a web search.
http://www.victoriabritish.com/
...has a regulator for $40 that adjusts from 1/2 to 5 1/2 PSI...you need to ask for a catalogue to see it though. Might be at JCWhitney...
http://www.victoriabritish.com/
...has a regulator for $40 that adjusts from 1/2 to 5 1/2 PSI...you need to ask for a catalogue to see it though. Might be at JCWhitney...
Give a boy a gun-give a biatch a cell phone-and pretty soon you almost got yourself a police state.
Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

Orwell said: War is peace! Freedom is slavery. Ignorance is strength...

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- Posts: 19
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- My tercel:: Goldie is a 1986 SR5 attualmente con Weber/also owned the first T4WD in STL in late '82
- Location: Kirkwood, a 'burb of St. Louis
XLNT photos!
Very sanitary installation - plus ditto engine bay.
Your writeup would be a plus to the genre.
I take it you do not have to worry about even lip service to emissions testing?
Tom M.
Very sanitary installation - plus ditto engine bay.
Your writeup would be a plus to the genre.
I take it you do not have to worry about even lip service to emissions testing?
Tom M.
T4WD augury?
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain
"Oh, do not ask, 'What is it?' Let us go and make our visit."
T.S. Eliot - "The Love Song of J. Alfred Prufrock"
"Now and then we had a hope that, if we lived and were good, God would permit us to be pirates."
Mark Twain