Supercharging the Oldsmobile 260 V8 on a budget Jaguar M112 roots blower draw through carburetor 4.3

Conclusion... it makes at least 100 horsepower over a stock 260. It makes about 8 psi full throttle. It will ping and knock over 5 psi unless I add a bottle of high quality octane booster. It runs very smooth, and feels like a stock Olds 403 but has much better gas millage. It has stock exhaust manifolds that unite to a single exhaust pipe. Stock factory 260 cam. The engine has never been opened or rebuilt. Whoever had it before me took care of it and it still runs good. Unfortunately I did have to cut a hole in the hood to clear the air cleaner ducting (It is a second generation firebird). If this setup was installed in a larger car or truck, it would've probably cleared. The supercharger whine is significantly less audible with the long air duct installed. I do have another video about boost referencing the carburetor and distributor, and another video about fabricating a low profile distributor cap for the HEI distributor for clearance! There is also another short video of if running. Thanks for looking.

[@markekberg8371]

Just stumbled across this. I have a 78 olds with a 260. Only has 45k miles. And i have a M12 laying around which is for a land rover. After seeing this i am very interested in this.

[@elreyyakko]

Will make good power. I had a 307 olds and put a t3/4 supra turbo on it blow through carb about 20 yrs ago. Ran great and solid 12.80-13.0s. Not bad for a stock 307 with a olds dominater intake,650 carb and msd with 2.73 gears. Full body and ac/heat worked. Missed that cutlass cruiser.

[@vannjunkin8041]

That sounds awesome

[@kskip4242]

Should have put some 373 is behind that thing it would have been fucking in the solid 12 sec range. A lot of people have slept on the 260 and 307 because they have webbed blocks but as long as you set them up right and give them proper tuning they hold up.

[@vannjunkin8041]

@@kskip4242 we're finding out the same with the 301 Pontiac. It CAN be built.

[@arbiewolfe3027]

Great effort....i do believe you might have wasted some effort with that bypass valve though...the blower can't flow more air at idle than the carb butterfly airgap can flow. At idle there will only ever be vacuum in the manifold untill the butterflies are cracked so there's no.pressure or flow to relieve. Supercharger experienced here as well. Not being critical...total respect for your work and for sharing it. 15:45

[@chriswiseman5143]

This is brilliant! Can’t wait to see it run

[@MidwestOptimist]

Only one way to find out if it'll work. I'd try to keep the boost in the 5lb range to start with. Be careful with the ignition advance. Stock static compression is 8:1 And the factory cam has no duration to bleed off compression. It should feel like a healthy 350 cu in with 5lbs. 5lbs = 9:1 dynamic compression 10lbs=430 cu in (10:1 dynamic compression) 15lbs=520cu in (11:1 dynamic compression) Pump gas with low duration/low overlap cams usually gets into detonation territory anything above 9:1 compression. Then again you could always try running E85 for higher octane. But the btu qty is about 70% of gasoline. Meaning you'd need to run a richer mixture.

[@raysoto1969]

Great prognosis! I will definately need to have high octane at least... I'm not sure the final psi will be

[@JoeHynes284]

you also get more O2 from E

[@JulianRodriguez-ww7wx]

That's awesome, you should make more videos. Everything is possible

[@JoeHynes284]

you are a mad man! I could have used this in 1994 when i built mine, it made me hate the 260

[@DynamicSeq]

Very interesting concept..

[@modeverything1]

Awesome build!

[@rogersaucedo8817]

This is cool more oldsmobile content 🤙💯

[@williamquinones2870]

Hoping to see your next video on this supercharged 260 I wanna hear what it's gonna sound like

[@raysoto1969]

kzbin.info/www/bejne/fJiWZXdufs2jabssi=7b0jmH64VCs7kSms

[@scotthatch4548]

You do interesting things ray ..... The bypass valve seems backwards to me it's drawing vacuum from the carb side not the intake manifold and so will keep opening and closing ... If the vacuum is on the manifold side boost will hold it shut ...

[@raysoto1969]

Thanks Scott!...I initially thought the same thing, but this is how it was installed on the mini cooper, and this is how it is installed on all superchargers with a bypass valve..... the vacuum is referenced to throttle side vacuum before the supercharger.... I think the reason for that is because they want to make sure that the second you let off the gas pedal to slow down, the bypass valve will immidiately open afterward.

[@samperras]

I hope it works out for you

[@jasonhumphry5836]

Very awesome 👏 😎

[@christopherpoucher483]

I really love this! ❤️

[@christopherpoucher483]

I'm an Oldsmobile lover, out of my time... born 89, but I've owned my fairly share of olds and , 350 olds is a beast with few mods

[@turkishmurphy]

Nice work ..

[@michaeldolson2397]

I love this!

[@davelowets]

You could have used a Holley carb... They are MUCH easier to boost reference the power-valve. Just drill a hole through the side of the main body, into the power-valve well, and epoxy a tube into the hole. Done. A Holley is much easier to tune, and tuning parts are readily available everywhere. Nice job though...

[@bobg3034]

Awesome!

[@redsmallpox]

мужик еще раз Ты гений, привет из России, буду перенимать опыт, все что Ты рассказываешь - это все верно и правильно

[@clarkinthedark1]

Super cool! Can’t wait for part 2. Is the supercharged Cadillac engine still in the works?

[@raysoto1969]

Yes, the Cadillac engine will be the "real" powerhouse

[@clarkinthedark1]

@@raysoto1969 uffff! Can’t wait!

[@igholleywood8388]

Got it

[@bobbyshaftoe]

re: aircleaner: why not make a duct for the top of the carb.. and run it to one or both sides ...with (a) remote filter(s)?

[@calvincrews3885]

Did you file the ring gaps wide enough and either hone the cylinder walls with a honing device or have the cylinders bored “30 over so it can make more horsepower

[@raysoto1969]

No, the engine is bone stock and high mileage. I don't drive the engine hard most of the time. I'll gun it once in a while.

[@davelowets]

No need to open the ring gaps at 5psi

[@johnparrish9215]

I'm interested in how this works out, I keep hearing the rear bearings will be washed out by the fuel.

[@raysoto1969]

Yes, precisely why I added grease zerks at the bearing caps. I grease them every few months. It's shown further in the video

[@analogkid4557]

My 307 is pretty slow, that 260 would just piss me off.😅

[@andywagner4674]

Did you have to swap the pulley if so Where did you get the pulleys for the supercharger?

[@raysoto1969]

Custom pulley... I welded two V-belt idler pulleys on a trimmed down OE pulley

[@leomelton3243]

Did you change out the bearings in the supercharger?

[@raysoto1969]

No

[@Skulljeep00]

That elbow for the carb is choking it, i would make one with a more smooth curvature and a wider mouth opening since your basically driving with a restrictor plate between your carb and your supercharger. That bypass hole is going to a pool of fuel rather quickly....

[@raysoto1969]

It does "look" restrictive, but the flange on the carb elbow to the supercharger inlet is just as wide. Still flows good enough for 8 psi of boost. The bypass valve is always open during regular driving and only closes at full throttle, so liquid fuel doesn't have a chance to accumulate.

[@bigb8110]

Any videos of it moving

[@raysoto1969]

I do need to do that

[@Legacypaint35]

Would you sell that set up

[@dondownriver3464]

im surprised you didnt use an aftermarket 260 to 403 intake there pretty cheap

[@raysoto1969]

Although the intakes from the larger engines will bolt up... there would be a severe port mismatch on the small 260... so the stock 260 intake had to be reused

[@josephbarr511]

If you're going to supercharge an Olds, why not just go get a 350 instead of a 260? It's 90 free cubic inches with way better heads (any late 70's model with low compression). Not saying this isn't interesting, but interesting =/= efficient.

[@ethanpenney7857]

Ain’t free if it ain’t in the car. Time is money and not everyone has a 350 laying around either

[@josephbarr511]

@@ethanpenney7857 Small block Oldsmobiles are a dime a dozen. In addition, if you decide you want ANY performance upgrades, you’ll end up doing the job twice, because you’re at a dead end with the 260. Time may be money, but so is money. Buy once, cry once.

[@elreyyakko]

​@@josephbarr511 olds 350s dime a dozen? Where? I havent come across one in years,and those that have them want good $$ for them. Not a sbc or ls, olds is a niche. If anything,be easier to find a 307. Those hold 12psi of boodt nicely,buolt one back in 2000 with a supra t3/4 turbo. Only bent a rod at 15psi, greed got better of me. 😂

[@davelowets]

​@@elreyyakko"15psi" doesn't bend rods, your tune did...

[@elreyyakko]

@@davelowets 93 octane, way before widebands were popular to use to tune, so yes, it was the tune, but still all factory motor. Did good for what it was. Knowing then what I know now, it would still be running.

[@TheHumpingRetards]

I have a AMC 290. So this is very cool

[@user-hf4eh2ts3q]

Oh, how much power do you think it'll make?

[@user-hf4eh2ts3q]

How the hell does a jaguar roots blower fit on an olds 260? BUT, could i use this on my olds 350?

[@raysoto1969]

Yes

[@JosephCowen-fz8vj]

It fits because someone thought out of the box and made it fit , anything will bolt anywhere with enough effort , company's make flat alloy plates that bolt to 4 Barrel intakes the top of the plate can be drilled for any blower , I had a 302 Cleveland in an Australian Falcon Ute , with C10 auto . It was so worn out I couldn't feel any compression, but still ran good , I got it for free so I thought I'd see what I could bolt on ! I welded up some steel piping , oil line and return , I had a Holset Volvo 14 litre Truck turbo , mounted it to the 302 Cleveland, worked grate , bit of lag but once wound up it more than doubled the 1979 factory HP of a 302 C. Anything can be done with imiganation .