262 V8 Vacuum line routing Photos

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262 V8 Vacuum line routing Photos

Postby TTait » Sat Mar 06, 2021 5:00 pm

Can someone post a diagram or photos of the vacuum line routing for a 1975 262 V8. P.O. Gave up and stripped 90% of the system out and capped everything off including carb, choke, distributer advance, thermal port switch etc. I could try to work it out on theory but I haven't owned a car with a carb in since my last H body in 1987.

Any help appreciated.

Tom
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
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Re: 262 V8 Vacuum line routing Photos

Postby HI WINDING MONZA » Sat Mar 06, 2021 5:46 pm

Did you try AutoZone online? They have some listed on there.....

Doug in P.R. 8)
My Old Monza now lives in Arizona with its newest owner.

The 90's just keep rollin' along........
1990 Chevrolet Silverado Regular Cab Long Bed 350 TBI V8 700R4 118K miles
1992 Pontiac Sunbird Coupe 2.0 OHC MPFI I4 TH125C 157k miles
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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Sat Mar 06, 2021 6:12 pm

I just registered and looked, but it doesn't appear that they have anything for the 75. Great idea though.
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
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Re: 262 V8 Vacuum line routing Photos

Postby spencerforhire » Sat Mar 06, 2021 9:38 pm

This is for a similar vintage 350, shouldn't be too different.
https://www.gmsquarebody.com/attachment ... gif.85049/
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
03 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
07 Saturn Ion Redline project
and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Sun Mar 07, 2021 3:44 am

Started with your image.

350 diagram small.jpg


And made these connections near the distributer. Note the pipe coming up apparently from the Auto transmission which I tied to the vac port on the manifold. The second port on the manifold I reconnected to the main line running over to the vacuum can over on the right. that restored operation of the air box under the dash. Is that hard pipe running down to the AT supposed to tie to the manifold vacuum as I suspected?

2 Distributer med inverted.jpg


Then I hooked up the rest following your diagram above as seen here:

3 vacuum connections med inverted.jpg


I'm not confident about the connection locations on the Carb. Connection "A" is at bottom center of the carb and I suspect is manifold vacuum not timed vacuum. Both ends of hose "C" were hooked up by the mechanic who barely got the car running - he ran it from that port on the carb to the bottom port on the thermal vacuum switch, but left the other half of the thermal vacuum switch open to atmosphere, so when that switch is open in his configuration that port on the carb is open to atmosphere? Doesn't make sense to me. Thoughts on that one especially are appreciated.

There are still multiple ports on the carb that are capped I assume that's fine,

Where I know I'm still not a factory configuration is this device here:

5 still empty inverted.jpg


This is near what I assume is the EGR and the distributer, shot from the let side of the car across the engine for clarity. What is this? It took vacuum at one time - probably teeing off one of the other lines?

Any need for delay valves or check valves? I'm used to putting those in and the lack of them makes me think I'm missing something. There really should be a check valve at the spherical vacuum bottle before the line that runs back under the dash for the HVAC air box right? Otherwise won't the flaps all sag every time I accelerate away from a light?

I've only had the car 36 hours and am making nice progress. I've found my big fuel supply problem and that should be fixed tomorrow when Amazon arrives. I appreciate the help and I'm looking forward to having a fairly functional car soon.
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On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
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Re: 262 V8 Vacuum line routing Photos

Postby 79MonzaSpyder » Sun Mar 07, 2021 11:54 pm

These are not mine but I have some pictures showing the vacuum hose routing on the engine because my car’s engine bay was empty when I got it and I am just starting to build my motor now and will need to sort the vacuum lines out myself at some point when I finally get my motor in, likely 2-4 months away. I have been searching Monza V8 engine pictures for many years compiling any I could find. I got a bunch from Bill Lynch, he’s on FB. If you give me an email address I can send you some of the engine ones have. They are 4MB to 5MB each.
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79 Chevrolet 3/4 ton Pickup Fully Restored with matching 78 11' Camper
80 Monza 2+2, Cloned into a 79 Monza Spyder V8 4 Speed (Current Project)
80 Monza Spyder V6 Auto (parts car, sadly)
80 Honda CB750K Fully Restored with Custom Full Dress
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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Mon Mar 08, 2021 12:48 am

message sent - thanks.
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
TTait
 
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Joined: Sat Feb 20, 2021 1:47 pm

Re: 262 V8 Vacuum line routing Photos

Postby spencerforhire » Tue Mar 09, 2021 10:36 pm

I'm not a purist, and especially when it comes to unnecessary smog equipment. If it was mine, I'd hook the distributor directly to the carb and pitch everything else other than the modulator valve on the trans and whatever is necessary for the HVAC air doors. If you need all that stuff for a visual smog check, I guess you're stuck with it.
The "fleet"-
72 Vega HB Drag Car -383/'Glide/9"(9.35@146.19)(5.94@117.28 1/8th)
77 Vega Estate wagon- project(someday)will have TPI305/T-5, S-10 spindles/axles
76 Vega GT- 400/4spd/9" retired from active duty(rusty)
06 Silverado 2WD ex.cab daily
03 Silverado 2WD ex.cab (retired)
06 Haulin' 20ft enclosed car transporter
06 GMC Canyon Shop truck
07 Colorado project( 5.3 4L60e swap)
99 Saturn SL1- wife's car
01 Saturn SC2- son's project
07 Saturn Ion Redline project
and 4 more Saturn "parts cars"
Note- the very act of listing all of these has made me realize I have some kind of problem.....

Visit http://www.spencerforhire.ca
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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Wed Mar 10, 2021 3:40 pm

Right now its not running great. It barely starts so I presume the choke isn't functioning correctly despite the seller telling me he had the carb rebuilt. My first goal is to jut try to hook it up at factory spec and see what I have. Putting the engineering hat on I want to get to a known stable point before I start bypassing things. All indications are that the car was once well cared for and a lot still seems to work once I restore fuses, hook things back up etc. The clock in the dash even started running for a few minutes for example. The car wants to work so I'm going to give it a chance to show me what it has before I start disconnecting and removing anything.

Similarly - its a 262. I'm not kidding myself. No amount of removing smog pumps and K&N air filters is going to make this thing a fast car. I may just try getting this car to stock and keeping it that way. So many other Monzas have been modified that running this one as poorly as it left the factory might be fun for a while. Whatever seems to make me happy any given day I guess?
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
TTait
 
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Re: 262 V8 Vacuum line routing Photos

Postby 79MonzaSpyder » Wed Mar 10, 2021 5:15 pm

Well, the other thing to consider is, if you get all the smog stuff sorted and it runs ok, you could put a mild 305 or 350 in and hook it all back up and have more power and unless you told someone or they started checking the Casting Numbers they wouldn't know it from a 262. I'm not real big on smog stuff and most older vehicles where I live at some point some previous owner took it all off. We did have smog testing for about 10 years here but the last government change nuked the smog testing so now it doesn't really matter, and for what it worth there was no exception for older vehicles when we had smog testing. You either passed smog testing or you could get a conditional pass but in order to do so you had to spend a minimum of $400 on repairing or correcting your emissions by a government certified emission shop and that would get you a conditional 1 year pass, so the next year if you failed again you would have to do that again and again, year after year until your finall got repaired enough to pass or the vehicle was scrapped. That said I still think basic smog stuff is ok, a working choke, a PCV, and a carbon canister I think are ok, and don't rob power. I don't think they ever had them on the Monza's but my dad's 74 Nova with the 350 had a smog pump on it and that was the stupidest thing ever. They where basically pumping fresh air into the exhaust manifolds to dilute the emissions enough to pass Federal Emissions testing, and that stupid pump robbed close to 10 HP.
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2018 Toyota Camry XSE V6
79 Chevrolet 3/4 ton Pickup Fully Restored with matching 78 11' Camper
80 Monza 2+2, Cloned into a 79 Monza Spyder V8 4 Speed (Current Project)
80 Monza Spyder V6 Auto (parts car, sadly)
80 Honda CB750K Fully Restored with Custom Full Dress
80 Honda CM400A 10,000 Orig. Miles Full Dress
75 Honda XL250 Fully Restored (first vehicle I ever owned)
73 Honda SL125 off roader
72 Honda Motorsport 250 (XL250) off roader
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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Wed Mar 10, 2021 8:43 pm

My first car was a 76 Monza 2+2 and whenever I would go on Ebay to see if there was one out there I assumed I was looking for a 76. While the 75 is a red headed stepchild in some ways it seems, I'm so happy I ended up with a 75 instead because its the newest year that doesn't require smog testing in CA. The inspector checking the car when it came into CA looked for an emissions compliance sticker showing that the car met 49 state federal standards in 75, but that's the only check the car will ever have in CA for emissions. She didn't look at the smog pump, check for a cat - anything. As it turned out, most of that stuff was unhooked at the time anyway.

Had the car been a 76 I would have been in a world of hurt - but I'm sitting pretty now.
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
TTait
 
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Re: 262 V8 Vacuum line routing Photos

Postby Monza Harry » Sun Mar 14, 2021 3:44 pm

That part you pictured [http://forums.h-body.org/download/file.php?id=44398] is the vacuum operated "Heat Riser" IIRC it is in the closed position without vacuum so a hook up there would probably be required easy check though it would pass vac. from manifold through a thermo-switch on the T-Stat housing I don't remember which colour though. The A.I.R. Pump is actually to add Oxygen [from the air] to improve the Catalytic convertor function. Those were a California only thing in the early years as I recall.

As for it being only a 262 I used to really enjoy the broad, broad, torque curve of mine except when sitting next to anything at the light. Fast No! Fun I thought so just not so for those who have to "measure up".
Harry
I'm not a hoarder I'm a preservationist 78 Monza Spyder (~Soon(ish +/- I guess) To Be 2+2 with Spoilers)
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Re: 262 V8 Vacuum line routing Photos

Postby TTait » Mon Mar 15, 2021 1:34 am

My daily driver is a Chevy Bolt, and the odometers are within about 100 miles of each other this week, just under 90k miles. It has all the acceleration I could want and I've never had to do a lick of maintenance. The Monza is the other end of the spectrum in a few ways - but most notably - its unique and has a soul.

It doesn't have to be fast, it just have to believe it is.

Thanks for the tips. I want to get it all working before I consider stripping anything off.
On my third H Body - 1975 Monza 2+2 4.3L Orange/Black (Current State: Running great - needs the AC finished before summer hits hard)
76 Monza 2+2 L4 (1982-1987)
77 Starfire V6 (1987-1987)
82 Delorean - Universal Raffle Car (2005-2013)
81 Delorean 2009 - Present
17 Chevy Bolt 2017- Sold back to GM for almost a full refund
22 Mustang Mach E on order
TTait
 
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Joined: Sat Feb 20, 2021 1:47 pm


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