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Maiden voyage after 9 years...but poor 383 performance?

Started by Mfr426, April 17, 2006, 08:38:53 PM

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deputycrawford

#25
April 21, 2006, 10:43:50 PM
I just hope you will fill us in on the distributor workings while waiting form the new carb. Hell, its still running anyway. Might as well have some fun learning about the car. Remember, If you're not at work, you'er not taking a break from your car ;D
If it ain't wide open; it ain't running.        Rule number one in motocross racing: Pin it; row the gear box; and wait until you hit something.     At work my motto is: If you need me, call someone else.

Mfr426

#26
April 23, 2006, 06:49:18 AM
I should clarify about the ebay carbs. I actually rebuilt them not the ebay seller. Each one had an "issue" though. One had a crack here (seller failed to mention) and one had the rod seats that would not come out, etc. So, the AVS that I have on now was the best one out of a bunch. I have a feeling that the seat that the rod sits in is NOT sitting correctly in the treads. The one seat was a real PITA to get out and we ended up retreading the thing. That could be the issue.

The NEW carb swap should tell us conclusively one way or the other. Today I am going to check the color of the spark and possibly replace the plugs just to be safe. I thought they were NGK plugs and it turns out I installed Bosch Platinum. Not sure that is the best plug for this motor. I'll look at getting the NGKs based on the spark color. If that checks out I'll fire her up and get the total timing reading.

Thanks again all and stay tuned for more fun.

Mike

moparjohn

#27
April 23, 2006, 08:55:20 AM
Mike I have heard of bad results on 383's with the Bosch plugs. I have tried many plugs and good old Champion seem to do the trick. Today is Sunday and I'm off and at home call me and I'll come up- I'm not a mechanic but I'll help you out any way I can. Call me 908-752-9100. John
Happiness is having a hole in your roof!

deputycrawford

#28
April 23, 2006, 10:28:48 AM
The metering rod problem would explain the part throttle problems. If it runs good at full throttle the your jets sound close. A new carb would tell you much.
If it ain't wide open; it ain't running.        Rule number one in motocross racing: Pin it; row the gear box; and wait until you hit something.     At work my motto is: If you need me, call someone else.

Mfr426

#29
April 23, 2006, 10:35:59 AM
Hey Deputy, it runs well at idle but NOT at full throttle. That's when it stumbles and breaks up and produces the black smoke. That's generally under load. If I throttle it up while the car is not moving it sounds better but still not potent like it should sound.

deputycrawford

#30
April 23, 2006, 10:52:35 AM
Oh, ok. Boy I would think jetting would have to be around 10 sizes off to act that bad. I guess, well just have to find out when you get to the next step.
If it ain't wide open; it ain't running.        Rule number one in motocross racing: Pin it; row the gear box; and wait until you hit something.     At work my motto is: If you need me, call someone else.

Mfr426

#31
April 24, 2006, 03:12:33 PM
Here's an update. I called Mancini to finalize my order for a new Edelbrock and the guy told me that my stock choke would not work anymore. He said I'll need to go to an electric choke (or a manual and not a factory type like I have). He also said I'd need a throttle adapter for it as well. Also, the one that I was hoping to get for about $230 is an AFB not an AVS. That AVS is about $100 more money.

I am trying to keep my car stock looking and thought it would be a direct replacement so now I'm rethinking taking a closer look at my AVS. Tonight I'm going to pull the thing apart, check the rods and float levels and then try it again. I dont want to deviate from the stock look and getting this new carb would do that. I think I'll try one more time with my AVS.

I did get my new NGK plugs today and new points, condensor and rotor yesterday so I'll put all of them on tonight. Perhaps I'll get lucky and have a piece of wood lodged in my carb (an easy fix).

I'll keep you up to date folks, thanks for the support!

Mike R in Reading PA

JB94

#32
May 13, 2006, 12:26:19 AM
Just curious.What fuel pump are you using and what pressure are you seeing at the carb inlet?

Mfr426

#33
May 14, 2006, 08:39:34 PM
Hey guys, I finally resolved this issue. I got the new Eddy Performer carb and timed it to 10 degrees. It NOW runs like a top and does great burnouts, idles nicely and even chirps gears.

The AVS that I had was just not cutting it and was the culprit.

y3chargerrt

#34
May 15, 2006, 06:08:47 AM
Glad to hear it Mike.See you ar Carlisle in july!

grouseman

#35
May 15, 2006, 03:17:56 PM
Okay, now that you're happy, let's do a post mortem on that AVS and find out what the problem was.  You've got a good learning opportunity here.  Check to see what size rods and jets are in there, prim and secondary (measure them with calipers if needed).  How many turns is the secondary spring screwed in?  What are the floats set to?  Are the needle valve seats good?  Were the tiny brass air bleed orifices and fuel pickup tubes plugged or damaged in any way? 

Good luck with it.  Glad you're up and running regardless. 

grouseman
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