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Old 05-27-2012, 09:17 PM
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383 with 6-71 blower

am having issues getting it to run properly and am curious to know if anyone in the ne iowa area knows anything about blown engines that could help me out in person, otherwise ill ask my questions on here, thanks.

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Old 05-28-2012, 08:10 PM
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i just reset the timing a little, running 20 deg initial and 40 at full advance all by 3k rpm. im having pin issues in the lower gears while accelerating under partial throttle, and in the higher gears it will start to build boost, my boost guage will flicker but it just wont come up on boost, 383 strocker with weiand 671 dual edelbrock 600cfm carbs. running 100 octane gas, does anyone have any idea or suggestions?
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Old 05-28-2012, 10:37 PM
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dump the eddys for starters get holleys
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Old 05-29-2012, 10:17 AM
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There's nothing wrong with running Edelbrock carbs as long as you used their instructions for setting them up for a blower. My 355 with a 6-71 ran great with dual 600 CFM Edelbrocks.

How are the plugs looking? What pulley ratio? What Cam? Ignition?
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Old 05-29-2012, 10:41 AM
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The stock distributor advance curve will not work

40deg is way too much

100 octane gas max under boost 32-36deg

92 octane gas max timing under boost 28-30deg

Distributor recurve:

limit the mechanical advance to -8 -10 degrees of mechanical advance travel

or lock out the distributor mechanical advance.

set the locked timing at 28 to 36deg depending on the fuel octane used.

You obviously did not read the Weiand supercharger instructions.

If running high boost and want to run 36deg timing under bost you may need up to 116 octane gas. depending on the engine compression ratio.

What is the blower bully drive ratio?

what is the compression ratio of the motor?

What cam?

what is the carb jetting now?

Electronic boost ignition retard box? yes no

Last edited by F-BIRD'88; 05-29-2012 at 10:49 AM.
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Old 05-29-2012, 11:51 AM
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Don't expect to see any boost at steady cruise and very little of it's potential at part throttle. Like others say, you're ping is from WAY too much timing, that'll get expensive fast.
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Old 06-02-2012, 10:18 PM
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sorry i havent posted sooner, i called up edelbrock and they sent me the parts to modify the carbs, a jet change and metering rod. im running a full msd6 btm with billet distributor. the cam is a comp cams blower cam, cant remember the specs at the moment, i havent check the plugs but i noticed the exhaust pipes are now white since ive switched to 100 octane gas. its set up for 10.5% over driven, im just wantin it to be streetable, and currently it is very streetable but am afraid of getting on it incase something happens, and with thing being my first blower motor i have alot to learn. i read the wieand manual many times before i ever installed the blower and in there i never found anything about timing, and from everything ive been reading on here guys are running between 32 and 40deg of timing at full advance. i went by the msd instructions on how to set up the spark curve so all my timing is in by 3k rpm.
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Old 06-03-2012, 11:19 AM
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Are you sure it is 10% OVER driven? That will never be streetable. Most are 10% ish UNDER driven. If it is 10% over, there may lie your problem. Post your pulley numbers. They are stamped on the outside of the pulley face. The lower pulley yo may have to count, it will be samped on the ide mounte to the balancer or hub (whatever you have).
I would go back to the basics first. Lock out the timing for now. I would start at 38 total. Depending on your dist this may require advancing the dist 2 teeth or so. Let it initial fall where it may. Work on getting the carbs adjusted first. It have Holley carbs, so I can't help with the eddys. I adjust mine rich until I just start to get the surge, hot of course.

Tackle one issue at a time. Change the plugs, I run ac deco R43t tapped to 35.
Get the carbs right then you can work on the timing curve. I run mine locked out all the time, no problems. Confirm your drive ratio.

Last edited by NOlowrider; 06-03-2012 at 11:34 AM.
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Old 06-03-2012, 05:43 PM
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im running a 34 on the blower and a 38 on the crank. its a 101 jet in the carbs
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Old 06-03-2012, 08:05 PM
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If you look at the chart below, 34/38 combo is not even on the chart. I think that is a major part of your problem. I run a 55 upper and a 50 lower, which comes to 9% UNDER driven. No one that I know of runs a blower over driven (on the street). I would swap the pulley for somewhere in the 10% under area and I would bet that your problems would be over.

I suspect that it is spinning so fast that it is creating a tremendous amount of heat, causing detonation which would acunt for the pinging. JMO

http://www.blowerdriveservice.com/8mm.pdf

Last edited by NOlowrider; 06-03-2012 at 08:14 PM.
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Old 06-04-2012, 07:27 AM
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Quote:
Originally Posted by juniorram
im running a 34 on the blower and a 38 on the crank. its a 101 jet in the carbs
Are those for a 1/2" pitch belt or a 8mm belt? Overdriven on the street is rarely done. The most I've ever seen is 1:1 and that was on a BBC.

Check out this book for good info on Street Supercharging:
Street Supercharging by Pat Ganal
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Old 06-04-2012, 07:51 AM
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u spinning that thing way to fast! flip the pulleys. around 30 degrees total with 91. edelbrocks are damn good street blower carbs don't listen on that holley crap
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Old 06-07-2012, 10:17 PM
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i ordered my afr guage today, where is the best place to mount the o2 sensor, or does it really matter where its placed in the exhaust
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Old 06-11-2012, 08:28 PM
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Eagle SIR I Beam Rods for SBC 5.700 will these rods hold up over 500hp with the rpms at 3000 to 6800 in a 383 stroker motor?
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Old 06-11-2012, 10:06 PM
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34/38 tooth pullys are the old 1/2 inch pitch, and you're running it +11.7% over, totally crazy. If you were to flip them as stated above, you would be at -10.5.
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