Aftermath of TBI Mods & Catchcan, 1992 C1500 350 SBC.
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- Опубликовано: 11 май 2023
- Empty fix the leaking valve cover, empty the catch can, change the oil, and replace the oil pressure sensor. Things seem to be working pretty good and I’m loving having my old truck back as a daily driver. Went from 14.5 MPG to a13.8 but got a noticeable gain in HP.
About a couple months ago I found a small coolant leak around the intake of my Small Block Chevy 350. After ignoring it for a while then misdiagnosing it. I thought the intake gasket on my engine was leaking coolant. I ordered new intake gaskets, and they were back ordered for a while. While these parts were backordered I was allowed to ponder. I eventually ordered all the recommended parts to make a SBC TBI gain more HP. I took advice straight from the internet and ordered all the parts to make my engine run at peak performance. Let’s see if the mods actually do anything. This video isn’t a ‘How to’ video, it’s a ‘how I did it’ video, it’s for entertainment purposes only.
Valve covers are leaking because you need the PCV system in operation. The engine is worn and has a lot of blow by, this is when you need the PCV more than ever. The mileage is down because you are feeding more fuel with the higher fuel pressure. The gunk in the catch can is from when you pulled the intake and dropped all that coolant down the lifter valley. The air cleaner you went to is not a good choice, the air has to go way up before it goes down into the TBI, so that kind of negates the air mods to the top of the throttle body. You might want to look up the salad bowl mods for the air cleaner. The engine needs a rebuild, the mains are knocking way too much when you changed the oil! I have a 90 model with almost all the mods you have but I built a roller cam engine, all stock, and getting 14.9 MPG. Have fun!
I do have a PCV, just no vacuum on it. I cleaned the valley out with a vacuum and then washed it all down with diesel then oil, then changed the oil.
With the new intake and spacer, a salad bowl won't fit under the hood. I put the air cleaner that low, too get as much free volume as possible, the air will already be coming from the sides.
Need more vacuum 😢
I still run the Tbi on my 92 Silverado. It’s the same Ecm, same Tbi units used in the trucks and cars. And it’s useable on my 350. 1990 iroc 350 heads, 083 castings, small chamber, milled, gives me 9.7:1 compression, small vortec hydraulic roller cam, rebuilt Tbi, larger cop car injectors, air horn cleaned up and milled off. Custom burned chip. 17 mpg at 80 plus. Moves the 4400 pound shortbed out pretty good. And mine is also a 5 speed. I have gone back and forth with changing the Tbi to carb. Hard to argue with 17 mpg and there is no way I could run 87 octane with my compression and a carb. The timing still controlled by 7477 Ecm. Ran this setup before I got the custom chip and 7477 Ecm and it demanded 93 octane. For me it was worth keeping the Tbi. I have a few big block Tbi units. When I change to those I will get another chip burned for the application.
You have to have a tps and the TV cable for the 700r4 to shift properly.
For those with the heads with the 4 bolts in the middle at the different angle, the china made rpm air gap intakes from professionals products come with the spacers for the 4 center bolts so you don’t have to grind an intake.
Tbi pumps are 14 psi pumps.
Maybe I will go carb. I run all msd on my 74 Camaro. I have looked at msd adapter wiring to hook all msd into the factory harness so I won’t have to cut anything, maybe have to cut the msd adapter harness. But factory wiring stays intact.
If I get to that point in power. My custom chip removed the factory rpm cut off and fuel cut off.
I run the stock pcv on my setup. The the engine was a 60,000 mile block, just honed, with rings and bearings. Rebuild the heads with better springs and hood valve seals. Not bad considering it lasted 100,000 miles on this rebuild, got abused daily, before it developed and oil leak and then blow by.
Since all the late model engines are sealed up really well from the factory, a lot of them run catch cans with oil breathers on the catch can when they modify. I have heard both sides. But circle track and drag cars run breathers. Whatever cid is above the pistons making power is also under the pistons making pressure in the crankcase. Drag cars run vacuum pumps to help reduce pressure in the oil pan, save the seals and improve ring seal. Not sure what a catch can and breather would make blow by worse when it’s vented better. Pcv was more of an emissions item than to help ring seal or blow by.
Boosted cars have to run catch cans with breathers.
I did a catch can cause I was curious, and I didn't want to fumes and gunk from the crank case going back into the intake. It has worked decent, the only issue I'm running into is getting the new valve covers to seal around the bolts.
I love marvel mystery oil. I have run this in many vehicles, and the engines are clean inside. I add to fuel to keep some lubrication in this stuff they call fuel today with a lot of ethanol in it.
It’s a mild cleaner.
I like using the stuff. Many people hate it.
Added an oil catch can on my 1992 Chev.K-1500 with 194k mlies ,350. Shocked a relatively short time later , to see I was 2 qrts. low . Yowsers . Quikly removed it ,went back to stock pcv valvation . Gunna see if I can improve even more by installing a fully ported stock intake and 193 Swirl heads ,we,ll see . Recently went from 13.5 mpg to 20.5 mpg at posted hwy. speeds with other mods previously stated ,below.
At posted highway speeds is the one that gets me
I can tell you from experience with a few 5.0s ive had that when the engines getting worn and having blow by those valve covers are garbage at holding pressure because of the bolt down design
Not a fan of the valve covers I went back to the old ones
When I hear that fuel efficiency has dropped after a fuel system mod I think air/fuel ratio or fuel temperature change. The intent of your mod was improve air/fuel ratio so that leaves fuel temperature. The header heat being sucked in through your open breather filter may be costing you some fuel efficiency. Just a thought.
Also I had a recent experience with a reduced oil pressure for appearent reason and it turned out that I had a partially blinded oil pump pick-up tube. At two previous oil changes I switched oil types. I used OEM spec viscosity only I changed to so called High Mileage. Also just a thought. By the way, your exhaust sounds badass.
I lost fuel efficiency because the engine needs to be tuned, the O2 sensor on these things barely corrects anything.
Have a 1992chev. silverado Extenda cab K-1500-350 - 700 R trans. ( 194,000 miles ) Former ,old farmer drivin ) .was getting 13.5 mpg. at posted speed limit/hwy. Rebuilt trans. , Installed MSD system,8mm. wires , several sensors , new TBI injectors , spacer ,injector risers gasket ( 3/8 in.) ,stock air cleaner 1/4 inch taller air cleaner,miner gap at lid ,5w30 pennsoil .Jumped to 20.5 mpg. O yes ,Michelin defender tires ,same size 16,s ,all around. Rumor has it , a specific gas station in town is selling gas that actually gets better fuel mileage ,checking it out ,.could be lack of alcohol ?
Could be, I have heard the tanks at gas station don't get tested enough could have water intrusion and such
What exhaust are you running on this!? Sounds awesome!
Thanks. I have long tube hooker headers, true duals, with some cheap glass packs.
@crescenthammer I guess the headers must be what makes the sound. I've had true duals and cheap glasspacks on a 350 before. Never sounded that good. Time to buy a set of headers then.
@Sc0teeBe318 oh yeah, I think it's the headers.
You should hook the catch can to a header evac system.
I was told it wouldn't work cause I do have mufflers on my truck. Glasspacks, but still mufflers.
@@crescenthammer I have two on my van. Both ahead of the high flow cats and muffler. Pulls good vacuum. 2-3 in/hg idling and 4-8 in/hg at WOT. Vacuum increases as the RPM increases.
@@chrisreynolds6520 might have to give it a try
Pennzoil, only use that if you intend on driving straight to scrap yard. Lol
I was told today that's one of my issues
If Alex Taylor runs Pennzoil in her 3,000hp 55, it’s fine for a worn out 350
@@thatrebelboy48 agreed.
@@thatrebelboy48 ya ok, do you know how often oil is changed in a alcohol motor like that? I do. Every single pass. So..... ya
How is the bottom end 7 months later?
Not sure
a buttload of miles? lol i bought mine with 175k on it and now have 310k and it still runs fine. keep up with general maintenance and you'll be good, unless you keep revving the bearings out of it like at the end of this video. also never abandon the pcv system, it has a purpose, and you don't have a race engine.
It blew up at 192k
I run rotella 15w40 regular oil in my 90 with 320,000 miles. Why? Cause its cheaper than store brand. I also add marvel mystery oil.
It’s a flat tappet cam engine.
I run 5w30 full synthetic, Walmart oil, and wix filters. in my 92 model, the 350 I built with hydraulic roller cam.
I used the cheapest oil I can find. That was before I blew the engine up
You switched the wrong oil sensor sir.
That ''sensor'' you changed is a pressure switch for the fuel pump so if the engine looses the oil pressure ecm will shut the fuel pump off. The gauge sensor is placed begind your left (drivers side) exhaust manifold. Try that and it might be a diffrence even thoe it been a while since video is posted 😎👍
There is no ecm. It's a carburated manual fuel pump 1961. That sensor is on the driver's side.
@@crescenthammerwhat?? Its a late 80s TBI i am looking at and that sensor in NOT for gauge signal sorry but it isn't
@bajsklumpf ooopps, sorry yeah wrong engine. I thought this was a comment on my IH Bus rebuild. Haha, yeah, you are correct, but I have since blown up this engine.
Maybe the extra fuel pressure is making the injectors push more fuel, creating a rich condition, fuel washing the cylinders.
Not a crazy idea. The old 90’s camaro’s and fox body mustang cars could up the amount of fuel injected by increasing fuel pressure. Sometimes the old efi systems needed help racing or at the drag strip.
Maybe that is why it’s using more fuel.
Hard to say without a leak down or compression test to check for combustion chamber sealing.
That could be the issue.
If that's the case then the stock fuel regulator in the tbi system needs to be changed if never been. You can also modify the spring for the diaphragm to regulate the flow manually if the demand needs to be lesser or greater depending on other mods to fuel management
@rudemark1715 I went back to the stock spring, drove it for a few more months, then pulled the engine. I'm working on swapping it now.
K& N oil filter will help
May try that
Wix is the best oil filter you can buy
rotella t4 15w40 is what i run in my 88 305
I may have to put a little bit heavier stuff in it than I usually do.
@@crescenthammerI run 5 w-40 in mine. So it’s not so thick when cold.
Try pro lube oil treatment that beast anything else
I'll try that next time
i like lucas products
I put a mechanical one in mine
Catch can or carb
Don’t use mystery oil in engine it will eat up rubber and plastic. If you have a leak and it gets on say a timing belt the belt will be breaking
This engine has a timing chain, no belt.
I just retired a 95 Chevy G20 305 277,000 miles leave him alone just change the oil every 4,005,000 me and use a good oil and being done with it
@davidgentz1731 This engine would've made it to that if I was nicer to her. I drove her like she was stolen and was always tinkering. I pulled her at 197k. I'm not original, and I'm doing an LS Swap now.