LazloZ28
08-21-2013, 04:55 PM
I have an 82 accord 1.8l EK1 manual. It ran ok but chugged going up hills when hot and idled at 1800-2500 rpm. It also smoked like a locomotive and shook violently when on the brakes. It's on stands in the garage now getting fixed up. Head gasket, valve seals, rack and pinion, brake booster, 4 corner brake job, and all belts/hoses/ignition. I did buy a carb rebuild kit but after checking over the system of ancient and somewhat superflous valves and whats its I ordered a 32/36 kit. I have searched and read all the write ups and such but still have a few ?s.
1st - what to do about the crankcase vent? I believe it should have one, but not sure how to pull it off, the stock system doesn't make alot of sense to me. I mean metered manifold vacuum I get(fixed orifice), condensation chamber(see catch can) is actually kinda awesome for this vintage of car, feeding to the air cleaner at high rpm I get, but there's no check valve or anything so wouldn't the manifold vacuum just pull from the air cleaner at idle doing nothing for the crankcase and simply causing a vacuum leak? I'm used to chevys and I know a proven system is breather on one valve cover, pcv valve connected to manifold vacuum on the other draws fresh air through the crankcase and the valve controls vacuum. Is there any source for fresh air in on these? I found a pcv valve listed for an 83 prelude, should I just hook that up to manifold vacuum? Or just run a breather?
2nd - I would like to keep the Evap system. It was removed from my truck when I got it and the smell of gas was just too much so I pulled junkyard parts and hooked it back up. I think I have it figured but double check me on this one. Control valve port goes to ported vacuum(or would it be venturi vacuum?), "purge" port goes to manifold vac, "carb" port is just a vent for the bowls in the stock carb when engine isn't running and I should just cap that, right? What is the big hose on the bottom, it's not in the service manual and it just disapears into the fram rail? Do I need to run the control port through the thermovalve?
3rd - secondary air or suction valve assy. Service manual says this keeps the cat from overheating, kinda like an air pump except it seems to run at exact opposite times as modern air pumps. Manual says it runs after thermovalve closes and only above 15mph. Also that the negetive pulses from the exhaust pulls fresh air from the air filter. Do I need this to keep the cat heathly? Will it even fit with the weber on there? Also kind of a side note but if it's bleeding off the negetive pulse from exhaust wouldn't it prevent any kind of scavanging in the cylinders(which we now know is very beneficial)?
4th - cruise control and A/C. Do I need any of the black box crap to run these? I doesn't appear so I just want to make sure. I know the a/c idle bump will be gone but thats not such a big deal is it?
Also on another side note, it appears that the vacuum system on this car works backwards from what I would have thought. Mainly with the air filters in the black box and the thermovalves being open cold to bleed vacuum instead of opening hot to supply vacuum. Wouldn't all this just be a bunch of vacuum leaks when the motors cold? If so I'm assuming the carb is designed for this but not sure how, or is the black box sealed and basically just a big vac can with valves inside?
Sorry for the long post, just trying to figure out these very strange systems that seem poorly designed and over complicated. I wonder if honda engineers were genuises and we still do things wrong, or they just didn't yet know how thesse things worked the best for emissions and performance. You gotta give it to them though the cvcc is a quite impressive solution compared to our smogged out 80hp V8s of the time.
1st - what to do about the crankcase vent? I believe it should have one, but not sure how to pull it off, the stock system doesn't make alot of sense to me. I mean metered manifold vacuum I get(fixed orifice), condensation chamber(see catch can) is actually kinda awesome for this vintage of car, feeding to the air cleaner at high rpm I get, but there's no check valve or anything so wouldn't the manifold vacuum just pull from the air cleaner at idle doing nothing for the crankcase and simply causing a vacuum leak? I'm used to chevys and I know a proven system is breather on one valve cover, pcv valve connected to manifold vacuum on the other draws fresh air through the crankcase and the valve controls vacuum. Is there any source for fresh air in on these? I found a pcv valve listed for an 83 prelude, should I just hook that up to manifold vacuum? Or just run a breather?
2nd - I would like to keep the Evap system. It was removed from my truck when I got it and the smell of gas was just too much so I pulled junkyard parts and hooked it back up. I think I have it figured but double check me on this one. Control valve port goes to ported vacuum(or would it be venturi vacuum?), "purge" port goes to manifold vac, "carb" port is just a vent for the bowls in the stock carb when engine isn't running and I should just cap that, right? What is the big hose on the bottom, it's not in the service manual and it just disapears into the fram rail? Do I need to run the control port through the thermovalve?
3rd - secondary air or suction valve assy. Service manual says this keeps the cat from overheating, kinda like an air pump except it seems to run at exact opposite times as modern air pumps. Manual says it runs after thermovalve closes and only above 15mph. Also that the negetive pulses from the exhaust pulls fresh air from the air filter. Do I need this to keep the cat heathly? Will it even fit with the weber on there? Also kind of a side note but if it's bleeding off the negetive pulse from exhaust wouldn't it prevent any kind of scavanging in the cylinders(which we now know is very beneficial)?
4th - cruise control and A/C. Do I need any of the black box crap to run these? I doesn't appear so I just want to make sure. I know the a/c idle bump will be gone but thats not such a big deal is it?
Also on another side note, it appears that the vacuum system on this car works backwards from what I would have thought. Mainly with the air filters in the black box and the thermovalves being open cold to bleed vacuum instead of opening hot to supply vacuum. Wouldn't all this just be a bunch of vacuum leaks when the motors cold? If so I'm assuming the carb is designed for this but not sure how, or is the black box sealed and basically just a big vac can with valves inside?
Sorry for the long post, just trying to figure out these very strange systems that seem poorly designed and over complicated. I wonder if honda engineers were genuises and we still do things wrong, or they just didn't yet know how thesse things worked the best for emissions and performance. You gotta give it to them though the cvcc is a quite impressive solution compared to our smogged out 80hp V8s of the time.