On that engine don't expect much out of that little 142. With your heads and cam it's not going to make much boost even with more overdrive. Your engine has good flow so with stock pulleys on the thing it may very well not be making anything. My bigger 177 on my 383 only made 4 psi with its stock pullies. Another guy I know with a 142 on a 383 has his at the max overdrive and it only makes like 6 psi. I would check the gauge though first as I've had bad ones before that did weird things.

 

i had one on a 355 with a comp 274 cam and performer RPM heads. I had the 6 inch crank pulley and the smallest blower pulley (2.40 i think) made 7-8 psi.

 

Line/gauge routing, individual lines for gauge (plus a known working substitute gauge) and P.V. boost reference, blower does NOT need a rebuild. Even with the standard ratio pulley set (which are engineered/estimated for a 350cid engine, same way the Big Chevy kit is engineered for a 454cid engine) on a healthy 383cid, you should see 4-6psi, especially with a straight-across grind like the Magnum series (that one's 230*/230*, if memory serves?). The combo's I've seen with less boost on the gauge than that ALL had minor problems that needed fixing. I will say that the as-delivered 6-rib isn't helping any, and a move to the newer 10-rib drive would be a good investment, if you're planning on keeping the blower setup for a while. Seems like your combo' should be ~420HP + boost, pretty strong. For cheap peace-of-mind, replace the blower-to-manifold gasket too, and torque very carefully to the recommended 10ft-lb (that is NOT a typo').

https://www.holley.com/products/gaskets/supercharger_gaskets/parts/6900

 

Ok......a little update. I spoke w . my buddy who owned the car before me. He had told me at Sea level it at MOST was making 3-4 lbs in good air. I am in Tucson which is about 4500-6500 feet DA. True is 2200ft.
Also checked the belt....16 yrs old LOL......it looked "OK", but gonna change it and go to the 7" lower. At Sea Level and fall NJ air 3800# wet it went 12.1 @ 113. We removed the AC, added manual steering, alum elec wp, Alum Rad, removed shit flow master 2.5" exhaust , added mandrel ALL 3" x pipe and 3" ss Ultra flow and dumps at the rear and moved batt to the back...... I went 12.9 @107 at about 5000ft in 83* air, but .60ft was a pathetic 2.4. I left like a bitch..lol That was also w a out of the box NON blower 750dp. Now I have the AED BLOWER 850dp. and it feels MUCH better. But No boost ?? lol

Also...10 rib kit is N/A !!! Why ??? You can buy the pulleys but not the idler as far as I have searched.

 

Also...10 rib kit is N/A !!! Why ??? You can buy the pulleys but not the idler as far as I have searched.

https://m.summitracing.com/search/brand/weiand/part-type/supercharger-pulleys

 

https://www.summitracing.com/int/parts/wnd-6899/overview/

 

I ran a B&M 162 on a 355SBC with a mild cam and made 450 RWHP with 440FtLbs with edelbrock performer RPM 64cc heads.
I was making 6lbs boost at full pedal nd it would die off.
I upgraded my belt to a 10 rib which made a huge difference, you dont realise how much the 6 rib slips under load.
With the 10 rib I made 8lbs boost and it was stable
I measured the top pulley RPM when on the dyno, it slipped a lot with the 6 rib.
It sounds to me that you may heave some slip but more that your engine is consuming everything you can feed it.
You may need a bigger blower rather than spinning your one faster.
The faster it goes the hotter the air gets, leads to detonation..
I upgraded to a B&M 250, there are a few of them about on the net.
I am currently rebuilding my engine with a more aggressive Hyd roller cam and followers as well as dual quad FiTec EFI.
Good luck figuring it out.

 

Try here

https://www.holley.com/products/superchargers/supercharger_components/parts/91163

https://www.holley.com/products/superchargers/supercharger_components/parts/6810WIN

https://www.holley.com/products/superchargers/supercharger_components/parts/6823WIN

 

That tensioner is for the Ford. I bought the 7" 10 rib crank , 2.85 Blower and the idler 10 rib. That will spin the blower pretty hard. Not sure on the slippage now. But it
won't slip with 10rib, I also purchased a NX Meth injection plate. That w a little 100 unleaded should run like a raped ape ! It should show a solid 6#'s.

 

HI there
Read a little closer on the site for the tensioner....

QUOTE "Mounts under blower nose; Can be used on all Chevy and Ford 144/174 blower kits; Includes "L" Shaped mounting bracket to mount under blower nose"

This is the same one I used on my 162.
I still think a 142 is too small for a 383
My 162 only kept up with my 355 because I spun it at 2.4:1. At 5000 RPM the blower was doing 12000 RPM.
The only reason we didnt hand grenade the motor with detonation was because we ran a really really heavy air fuel mix the quench the detonation.
trust me, been there........done that

 

His newer Weiand has the wraparound-the-snout tensioner, if I'm seein' it right. I know the tensioner you're talkin' about though, I too had a little 162cid B&M (impossible to find, even back in the '90's)

 

I converted my 142 to a 8mm setup back when i had one. We machined the back of the manifold for a small spring loaded burst panel. Made 6psi all day long on a healthy 355 engine. I wish i had photos still as i lost them all when my computer crashed years ago. A local engineering guy built the pulleys and idler arm.

 

Here's the '80's version for the rest of ya':

 

I snapped that POS off twice before giving up :smt093

 

OP - any update with the upgraded pulleys and belt?

 

OK....UPDATE time. Took it for one last test before changing parts. made under 3#'s @ 5800. STOCK pulleys 6.rib. (6" lower /3.5 upper) Changes were new SFI balancer, 7" lower and 2.85 upper 10 rib, added a fuel cell, new larger return line, and 100 unleaded. It now makes 7-8lbs and is an absolute FUCKING BEAST !!! Taking it to the track next week. I actually have a SHITLOAD more parts......a complete Comp hyd roller blower cam kit, rockers, NX meth plate, and a bunch of other stuff like a full Caltrac set up w split mono's and shocks all the way around. Gonna wait on that now. The cam is the same RPM range I have now so Im not worried about over spinning it. BUT the cam is 113* vs the 109* it has now, thinking it will just build boost a LOT faster. When you smash it it goes right to 5lbs 4500 and creeps up to about 8lbs at about 5800. I have not even touched the timing but its pretty NON aggressive and with good fuel and METH plate it can be pushed a little. It went 109.7 last time out and I would be shocked if it didn't go at least 115-116 next time out. Remember this is at 4500-5000ft. in Shit desert air. Next report will be after testing.

 

That's encouraging. I'm in the middle of my 383 build with a 142 and have been considering getting rid of it and getting the blower shop 192. Always worried about it not being enough. I even changed plans, upped the compression, and will be running E85 to keep it cool in an effort to make it more efficient. I also have 10rib pulleys for it, 7" bottom and the stock size 3" top. (mine would be 2.30:1 compared to your current 2.45:1 drive ratio. Not a huge difference.)

What RPM are you spinning the motor to? Does the blower seem to fall off?

 

I have a old Comp 280 Magnum...maybe the WORST possible blower cam made.
It jumps to 5lbs instantly and climbs to about 7-8lbs at 5800rpm. It pulls like a beast !
I have a new Comp Hyd Roller Blower cam I'm gonna install in the near future. Just remember ....Get a BLOWER CARB !!!! It will make a big difference. I have a custom AED 850 DP. I honestly didn't think the pullies would make that much difference. I was thinking MAYBE 5lbs......It showed 2 maybe 2.5lbs before. Now its a solid 7-8lbs.
Like I said before.. still got a LOT of tuning to do, full suspension, and a NX Meth plate. Looking for Mid- Low 11's Grabbin and stabbing !!! I have NO DOUBT....this car would be in the 10's back east when done w the good air. NEXT up....installing the FAST dual 02's and start tuning this weekend. Gonna take it to the track next weekend. I'll post the results when I get them. Looking to break into the 11's @ 115-117.on 275 Nitto DR's @4500ft elev. It's gonna get 28x9 slicks VERY soon.

 

My buddy runs a 177 on a 383 and made 572hp. It's in a 72 short bed Chevy. 9:1 compression, iron heads. It's an old build, I don't remember the cam. Mike Mendenhall did the heads and Pete Thompson built the motor. Was a fun street truck. Low 12's on street tires.

 

Subscribing, I work on 3 cars running the small Weiand blowers.

 

Well a little update. Since the track was busy w 4 day bracket stuff then rain, I decided to do the Full Cal track set up (springs, bars and shocks all the way around. And the FAST dual o2's. Later this week the NX meth plate. Then I'll test early March. Should be much better. Car does work much better on the street, but the time slip is a little more accurate then the butt dyno . Back after I test !

 

Get nitrous plate under that carb.E85 on fuel side.Go 89 fuel jet and 93 nitrous jet.5.5 lbs fuel pressure flowing.950 lbs nitrous pressure.That will bring that engine out of hibernation.We ran that for years.If we had 35 deg timing with blower we would drop down to 27- 28 area on timing with dist locked.Will need decent converter or you will smoke it.We ran 5.30s at 3200 with nitrous on those blowers.We made our own pulleys and spun those turds hard.E85 will seal it and nitrous will cool it too.

 

1. It's a STICK car, NEVER changing that. 2. Meth will work BETTER the N20 on this application and 100x's cheaper. 3. NOT spending $850 on E85 blower carb, then $10 a gal on fuel !!! Pump E85 is JUNK !!

 

What ever you think.We run 13 to 1 comp with those junk blowers on e85 pump gas.We went considerbly quicker than you at more weight on that junk fuel also.Guess you have it figured out then.You don't need a 850.00 carb just very little carb knowledge and anyone can convert over.

 

It's funny guys make way north of 2000 HP on that junk e85 fuel.Filled my blower street car today at 1.69 a gal.

 

1963 DREMER...THAT Z is 3800lbs !!! So you get a metal and a trophy for building something faster,....But I can drive mine ANYWHERE w AC !! So SUCK MY BALLS !!! Pump E85 w 2000hp ?? For what 1 Pass or 1/2 a dyno pull ??!!!

 

"you girlfriend above said he makes 2000+HP w pump e85 !!! You can't jam the trophies up each others asses!!"

Nightmare,

here's a little tip for ya......

The rest of YB is a bit rough and tumble.
Here in the tech section's, when a question is asked, the people who know the answer's and are trying to help you, deserve some respect.......

There's a lot of very talented/knowledgeable people here in the tech section's.
If you want their help, loose the New Jersey attitude.....

Jim

 

Nightmare, you can do what you want and have your opinion, but if some people are doing something and it works for them, then maybe you should listen. You might learn something. My car is over 4000 lbs and I'm running a 10-71 running more boost and making more hp than you and I'm on pump E85. My car is a street car, no cage or roll bar and I drive it all over. I have friends that also run E85 in their blown street cars with no issues and make good power with reliability. Do as you wish, but don't say something doesn't work just because you can't make it work for you. Just some friendly advice.

 

Yea?? Well I'll run pump e85 when you drive it the fuck over to my house !!! I NEVER said "I CANT MAKE IT WORK FOR ME!!" Closest place to me is about 35-40 miles EACH WAY. You make more power then me w/ a 10-71 to my little 144 ?? Another trophy winner !!!! Do I need a looser converter for my 5 speed too !!!! Listen....METH inj WILL be MUCH MUCH safer and work as well as or BETTER then nitrous on MY combo and be 1000x's cheaper.

you girlfriend above said he makes 2000+HP w pump e85 !!! You can't jam the trophies up each others asses!!

 

Wow. No need to Throw a rod pal. You made a completely ignorant statement that "pump e85 is junk" (which it is not) so don't be surprised when someone calls out your ignorance. So you don't want to run it. Fine don't run it. I had a blower like yours on a 383 in a 4300 pound pickup 10 years ago the ran 11.90's@113-114 on pump piss 91. No meth injection, just shit gas and I drove it to work every day. Meth injection will not work as good a nitrous. That's just stupid talk. Will it make the Tune safer, yes. It will not go faster without spinning the blower harder. Fact is on the same tune it will more than likely slow down.

 

This guy is funny.

We are getting a new fuel station 3 miles away...E85. I'll be switching. Consume 30% more fuel, but ~25% cheaper...and 104 octane.

I understand it is great fuel with a blower (which I will be adding to my combination).

Good luck on the build...