Small roots blower for smallblock

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Will tell you this when I was building my engine for my car back in 1988 my engine wasn't quite ready and my supercharger came in from Dick Landy so we decided to put it on my buddies 68 satellite with a 273. It turned that little 273 into an animal, smoking tires a will. I think you're going to have a good time with this. blower, however mine is a 174 unit. Good luck!!!!
 

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Scampin said:
Getting closer. Had to change everything. Waiting on the radiator and a few other things.

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How long is the snout on your blower from the mounting flange to the end of the pulley?
 
End of mounting flange to end of pulley is around 11 7/8"
 
Pretty cool. These little things are sweet. I have a NOS B&M kit I haven't got around to yet. Ditch that 6 rib pulley Pos ASAP and go straight to 10 rib...if you can that is. Since no one ever made a 10 rib crank pulley for the SBM, I had one designed after the one in my kit, took months for my friend to machine it for me. LOL. I then bought a new blower snout 1" shorter, available through Weiand, again, those aren't cheap. The extra 4 ribs in the pulley was exactly 1" so I got lucky with that!
 

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Want to sell the bottom 6 rib pulley? Mine has a couple teeth knocked out of it. Whatever this thing does, its going to do. It is strictly a fun driver. Though I will def. take it to the track and see what she will do.

Question for everybody running similar combo's, when you type your combination into this calculator: http://performancetrends.com/Calcul...-Calculator/Supercharger-Boost-Calculator.php Do you get crazy boost numbers like it is purposing mine will make? is it just wrong?
 
Egag has pulley spacers that can be ordered with a 2.25" female register (to mate up to a sb Mopar harmonic ballancer) and a 2" male register on the other side. Simply stack combinations of spacers, V pullies, and serpentine pulley....These already have the same 6 on 2.76" bolt pattern as the balancer has.

How much boost are you running now? With your current setup.
 

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Scampin said:
Want to sell the bottom 6 rib pulley? Mine has a couple teeth knocked out of it. Whatever this thing does, its going to do. It is strictly a fun driver. Though I will def. take it to the track and see what she will do.

Question for everybody running similar combo's, when you type your combination into this calculator: http://performancetrends.com/Calcul...-Calculator/Supercharger-Boost-Calculator.php Do you get crazy boost numbers like it is purposing mine will make? is it just wrong?
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I don't know the boost numbers on mine but there's definitely boost an it hauls a!!. I haven't switched to the ten rib but haven't noticed any slippage. And I just installed the 2.85 top pulley on mine with the lower 6 inch pulley. I gotta tell you these things are a blast. I just installed 4:10 s an can't wait till I get the driveline cut to length an try it again with the 4:10s! Have fun.
 
What size motor and what size blower are you running?
 
I've read the more efficient your motor is the less boost you will see. But who am I.
 
Scampin said:
What size motor and what size blower are you running?
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Jury is still out on the size. I thought it was the older 162-4 ? But met some guy at good guys who had the exact same one claimed he bought it directly from dick Landry back in the day an said it was a 177 I don't know. But I'm happy with it what ever it is.
It's on a little teen stroker.
 
MiradaMegaCab said:
Egag has pulley spacers that can be ordered with a 2.25" female register (to mate up to a sb Mopar harmonic ballancer) and a 2" male register on the other side. Simply stack combinations of spacers, V pullies, and serpentine pulley....These already have the same 6 on 2.76" bolt pattern as the balancer has.

How much boost are you running now? With your current setup.
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If you are asking me how much boost, I haven't run it yet. According to the online calculator I should be ordering a bigger pulley before I fire it because its going to make too much boost for this motor to handle. If you type your setup into the calculator link does it come up with the boost numbers your engine is seeing?
 
mopardude318 said:
Pretty cool. These little things are sweet. I have a NOS B&M kit I haven't got around to yet. Ditch that 6 rib pulley Pos ASAP and go straight to 10 rib...if you can that is. Since no one ever made a 10 rib crank pulley for the SBM, I had one designed after the one in my kit, took months for my friend to machine it for me. LOL. I then bought a new blower snout 1" shorter, available through Weiand, again, those aren't cheap. The extra 4 ribs in the pulley was exactly 1" so I got lucky with that!
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MoparDude318 has great info for using a 10 rib belt and pulley system. I would definitely recommend it for the 174 and would recommend it for 162 applications where high boost (8PSI) and high engine RPMs will be seen under racing conditions. However, on a mild build with a small 144 blower, the 6 rib will be fine. 10 rib conversions are expensive$$$$.
I run a 174, with a 2.75 blower pulley and a 6" crank pulley. I shift at 7,000RPMs , so the blower is seeing 14,700 RPMs, I was going to skip the 10 rib system and go to a Gilmer Drive, requiring a blow off valve on the intake manifold. Anything more than a 150 shot of N2O results in belt slip, I actually see zero boost, under heavy use of nitrous. The serpentine systems will let the belt slip if an engine backfire occurs thru the intake. So after that outburst, I got a feeling your system will work fine for the mild combination you have. Run the pulley you have, install a boost gauge, keep the total timing at 28° to start with. Less timing if you're seeing over 5PSI.
Best of luck on your build.
 
How big of a motor are you running? I want to type the numbers in the calculator to see what boost numbers it comes up with. Depending on the eff% for my setup it says anywhere from 12-24psi. Stock 273, 144cu/in blower, 3" upper, 6" lower. If you put the numbers in for a 340 and it comes with a more reasonable number.
 
That was on an old school Mopar Performance 360 reman short block with a tottaly mismatched cam, .509 lift and a tight 108° LSA..... Alot of overlap so i was blowing boost out the exhaust valves. That online calculator is confusing, to say the least.....
I found some info on YelowBullet.
 

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Using that formula comes up with 12psi. Think a stock motor will hold it?
 
very cool project, Scampin. One thing you have in your favor is that 273 should have a forged crank. 12 psi ????? IDK
 
A boost gauge is mandatory or at least one temporarily hooked up. Each individual application is different. Stock engines will be fine in the 5PSI range. I'm gonna bet you're going to be making around 5PSI. Run it the way it is. Run a tighter gap on the spark plugs.
The head gasket is the weakest link.......
I run SCE copper head gaskets, my heads are O-Ringed and I got receiver grooves cut into the block.
With boost I would recommend 360° main bearings, to give full time oiling of the rod bearings. But, in your application I wouldn't loose sleep over it.
 
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