Bypassing the Super charger?

[MelsRegal]

Doesn’t the compression get higher when in boost?
And I know it’s the exception I drive in such a way it’s the rule 😅

I know it’s lower compression normally but I’m saying what I’m saying because I understand it that boost increases compression hence the octane rating amd at least according to my car manual different plug. I use 41-01 but I’m not sure if the early L67 needs something else. I know the TSB s of the late 90s tell to use iridium or copper, not the original platinum

Compression ratio is a fixed number based on the size of the cylinder and the volume of the cylinder head. What is different is the amount of air/oxygen in the cylinder when using a supercharger which causes higher cylinder pressures not ratio. The ratio of cylinder volume to head volume doesn't change.

 

[LARRY70GS]

Doesn’t the compression get higher when in boost?
And I know it’s the exception I drive in such a way it’s the rule 😅

I know it’s lower compression normally but I’m saying what I’m saying because I understand it that boost increases compression hence the octane rating amd at least according to my car manual different plug. I use 41-01 but I’m not sure if the early L67 needs something else. I know the TSB s of the late 90s tell to use iridium or copper, not the original platinum

Yes, boost is like increasing compression for sure. Have a look at the plugs on Rock Auto,

1997 Riviera N/A 3800,

1997 BUICK RIVIERA 3.8L V6 Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1997 BUICK RIVIERA at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

1999 Riviera SC 3800,

1999 BUICK RIVIERA 3.8L V6 Supercharged Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1999 BUICK RIVIERA at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

Plugs are very much the same.

In any case, for the OP, if he does take the belt off the Supercharger, the car will be a slug. A spark plug change will not make that any better or worse. I am really curious to see if he does this, and what his conclusions are.

 

[LARRY70GS]

Compression ratio is a fixed number based on the size of the cylinder and the volume of the cylinder head. What is different is the amount of air/oxygen in the cylinder when using a supercharger which causes higher cylinder pressures not ratio. The ratio of cylinder volume to head volume doesn't change.

Static compression ratio is a fixed number. Adding boost is just like an increase in compression ratio. Have a look at the chart in this article,

Boost Compression Ratio Chart

Best Boost to Compression Ratio Chart and Definition from RPM Outlet. How Much Compression can I run With a supercharger? Find out here

www.rpmoutlet.com

My SC3800 runs about 7-8 lbs. of boost. With an 8.5:1 static compression, that's about 13:1 compression.

 

[BuickGirlFromMars]

Static compression ratio is a fixed number. Adding boost is just like an increase in compression ratio. Have a look at the chart in this article,

Boost Compression Ratio Chart

Best Boost to Compression Ratio Chart and Definition from RPM Outlet. How Much Compression can I run With a supercharger? Find out here

www.rpmoutlet.com

View attachment 29879
My SC3800 runs about 7-8 lbs. of boost. With an 8.5:1 static compression, that's about 13:1 compression.

So if the car does call for a different plug on na in 93, he should use it.
if not he shouldn’t. That’s what I been saying. Because it would likely wear better

 

[-Regal-]

At the very least I am curious how the car would perform. The earlier SC motor doesn't really seem to put out much more power than the Series II 3800, and I actually prefer the Series I because it puts out less power without really feeling like it and it's less power for the motor to harm itself. I would never do it but because of my curiosity I'm not going to discourage the OP from it. Maybe would be the same thing where the motor is putting out less power to harm itself; might be a bulletproof dog of a motor that way.

 

[LARRY70GS]

So if the car does call for a different plug on na in 93, he should use it.
if not he shouldn’t. That’s what I been saying. Because it would likely wear better

I would say no. Auto engineers choose spark plugs based on much more than whether the engine is in boost or not. But like I said, the engine in normally out of boost rather than in it.

 

[BuickGirlFromMars]

I would say no. Auto engineers choose spark plugs based on much more than whether the engine is in boost or not. But like I said, the engine in normally out of boost rather than in it.

Yes but neither of us know off hand what a 93, an early year SC, was called for on a park plug as that was early bulky and anemic even by m90 of 1999. I’m saying make sure I’m not saying it’s fact lol. If it’s the same, yay!

 

[2007LucerneCXL]

I've contacted a expert and he's going to fix this vehicle and all it's problems.

 

[LARRY70GS]

Yes but neither of us know off hand what a 93, an early year SC, was called for on a park plug as that was early bulky and anemic even by m90 of 1999. I’m saying make sure I’m not saying it’s fact lol. If it’s the same, yay!

Easy enough to look up,

1993 PA SC3800,

1993 BUICK PARK AVENUE 3.8L V6 Supercharged Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1993 BUICK PARK AVENUE at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

1993 NA 3800,

1993 BUICK PARK AVENUE 3.8L V6 Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1993 BUICK PARK AVENUE at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

Looks like same plugs.

Same thing in 1992.

 

[LARRY70GS]

I've contacted a expert and he's going to fix this vehicle and all it's problems.
View attachment 29883

Like a horse, broke a leg, we had to shoot him.

 

[BuickGirlFromMars]

Easy enough to look up,

1993 PA SC3800,

1993 BUICK PARK AVENUE 3.8L V6 Supercharged Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1993 BUICK PARK AVENUE at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

1993 NA 3800,

1993 BUICK PARK AVENUE 3.8L V6 Spark Plug | Shop Now at RockAuto

Ignition Parts and More for Your 1993 BUICK PARK AVENUE at Reliably Low Prices. Fast Online Catalog. DIY-Easy. Your Choice of Quality. Full Manufacturer Warranty.

www.rockauto.com

Looks like same plugs.

Same thing in 1992.

perfect, no reason to be concerned then. also, looks like we are in a vain attempt to help or explain as he decided it was time for expert help.

That hurt a bit, just quite offensive, really. We were the 5 minute run-back-to-your-ex but quickly he turned around to chase another tail.

This almost makes me as sad as when I see these

 

[2007LucerneCXL]

Well the OP vehicle seems it's share of problems, but it's not clear if they are getting resolved.

 

[BuickGirlFromMars]

At the very least I am curious how the car would perform. The earlier SC motor doesn't really seem to put out much more power than the Series II 3800, and I actually prefer the Series I because it puts out less power without really feeling like it and it's less power for the motor to harm itself. I would never do it but because of my curiosity I'm not going to discourage the OP from it. Maybe would be the same thing where the motor is putting out less power to harm itself; might be a bulletproof dog of a motor that way.

Might be. The sc has different connecting rods and internals to beef it up so I could see that especially as far as unintended events that even diligent repair can’t prepare for. Like leave a car on idling and a while out the car ran low on coolant and overheated or maybe somehow a head gasket went and the engine was close to breaking a rod from hydro lock before you caught it, the parts would survive maybe less harmed or just survive period compared to normal. Maybe.
Series 1 do you mean when it was called 3800 only or when it said series 1

 

[BuickGirlFromMars]

This being what I meant

 

[Buickguy123]

As someone who just replaced about 90% of their drive train pulleys with either new bearins, pulleys , or a AC Bypass pulley, I will give some gripes of my engine specifically a 1999 L67(keything being a 99, 2000+ removes a big one)
-That engine bracket. The big one blocking the belts in. THat has to be removed for a belt. So does it on a NA of the same year, but its just especially difficult on the SC since its 2 belts not just one.
-accessing some bolts on top of the supercharger, just a pain
-if i did a coupler, a coupler on this job would just have been more mess/dirt/etc to worry about(I did it all with snout on, my coupler is good)
--by extension, SC fluid is expensive and the old stuff STINKS. animal fats and 5w-30 🙁
-PCV baffle. annoying.
-vacuum system for the supercharger, the port under snout and the lines to the bypass solenoid. just more hoses and connections.
-Airbox noise baffling, i want to hear my boost, damnit
-plastic idler pulley(Maybe tensioner pulley, one of the two) was plastic and it was worn. metal would likely be worn too, but id rather have a smooth or ribbed metal pulley and bearing instead of a plastic anything pulley on a metal bearing. heat cycles, less hardness, etc. I replaced with metal pulley fortunately

So you can see.. my actual mechanical complaints are not that serious OR lenghty and i Have done some major service to my car in the last 2 years ive had it now. more complaints come from platform-wide issues that are on riviera, park avenue, and Oldsmobile Aurora as well or just GM decisions that are fleetwide and annoying, nothing specific because of SC

I can remove both belts and put them back on without removing anything but it is not much fun. If I remove the belt over the SC there will be no belt over the AC compressor if I am not mistaken. The AC comes on when needed for a few minutes then the system defaults to VENT since the AC is low on freon. But, if I remove that belt will the car throw codes because the AC unit is not spinning.?

 

[Buickguy123]

If you remove the supercharger belt, you do not need to put another belt on those pulleys. The Accessory belt will drive everything else. Again, this will not damage anything.

If you insist on doing this, I would also disable the Boost Bypass Actuator.

If I remove that belt all together there will be nothing to spin the AC unit which I do not care since it is low on Freon and if not having spinning causes no damage I would not care. The reason why I wish to do this is because there are funny noises coming out of the SC? I want to see what disabling it will do? Supposedly the mechanics who changed the intake gaskets replaced the SC oil as I asked but I do not trust those two. My fault however...long story...live and learn...

 

[LARRY70GS]

I can remove both belts and put them back on without removing anything but it is not much fun. If I remove the belt over the SC there will be no belt over the AC compressor if I am not mistaken.

My contention is you are mistaken. I have never seen a supercharged 3800 that uses the same belt to run the supercharger and the A/C compressor. One belt drives the supercharger and nothing else. The other belt independently drives everything else.

 

[Buickguy123]

My contention is you are mistaken. I have never seen a supercharged 3800 that uses the same belt to run the supercharger and the A/C compressor. One belt drives the supercharger and nothing else. The other belt independently drives everything else.

View attachment 29898

No sir. On my 1993 Buick Park Avenue the belt goes over the Super Charger and runs down over the AC unit. Unless I reconnected them we in somehow? I was looking at it last night.

 

[Buickguy123]

My contention is you are mistaken. I have never seen a supercharged 3800 that uses the same belt to run the supercharger and the A/C compressor. One belt drives the supercharger and nothing else. The other belt independently drives everything else.

View attachment 29898

 

[Buickguy123]

I think you are more familiar with thecseries 2. Mine is a series 1. Confusing at times. Series 3 the best I read? Thanks for all the input! You people are great!