poor dyno numbers from 408 :(

[~The Jester~]

My Chuck Nuytten 850 actually flows around 920! Awesome carb. IF it actually came from Chuck (and some gearhead hasn't played with it since then) you should be good to go on that piece. Timing still might be an issue, but it's not gonna make the car way lean like that.

One mistake we've made in the past was swapping intakes. Went from a single plane (flat carb mount) back to a dual plane (slanted carb mount). What that did to us was made the rear float level WAY too low. Maybe check on that too.

Get an answer from MSD yet? I think they even have the diagrams on there too, hold on I go looky for ya.

[~The Jester~]

I think this might be what you're lookin for:

http://www.msdignition.com/pdf/8350_...4_frm23728.pdf

[rwhite65]

Well, this carb is really one of his, a beautifull carb...has his labels on it and all. I called them today, and they were very helpfull, although I need to get more numbers off of the houseing tom.

I am hoping they tell me that the carb was built for another motor, and can help me as to what jets I need. As red82gt pointed out from the numbers, it just kinda falls out after 4,000. Still pulls, but nothing like I would expect.
I will keep ya posted,
and thanks for the link to MSD Jester!!
Ryan

[rwhite65]

After reading that Jester, I suspect they may have the mechanical advance locked out.
Ryan

[rwhite65]

Well, I figured you were all nice enough to shoot me ideas, and even though I am waiting for the parts, I am fairly confident that the problem is the timing.

Took the cap and rotor off, and no springs or bushings, it is all removed. The shaft is "locked" out as the stuff on MSD's website shows, so I called them up and they are sending me all the different springs and bushings...for free!!! Got to say MSD is gonna be my next ignition.....if I ever quit being a chep @#$.

The only reason I can figure they have it locked out is because maybe this distributor was bought for or once used on a fuel injected car...any other ideas why they would have done this?

Last problem is the dang thing hot starts pretty bad after driving it, then stopping for a few minutes, then starting it back up. I have the timing backed down pretty far, but I am thinking maybe it needs a ignition retarding box. Any one have this problem or experience with these?
Ryan

[andy669]

I didnt even look at the dyno sheets til just now. I wish I had a scanner so I could show you what the A/F on a carb car is supposed to look like.

I use no ignition advance at all, but the 7AL3 has an optional 25 degree start retard so I dont really get the 'hot start' symptoms.

What cam is in that thing? After looking at the graphs, I'd say that thing needs more valve spring pressure.

Andy

[rwhite65]

I am taking it back to his house now, where all the info on the specs of the engine is suppose to be sitting in the garage for me. He told me it was the 2nd from the biggest cam that Comp cams offers for that engine.

I have no idea on the series, I hope to be able to post that info in a few hours. I aslo talked with the carb guy's tech people. They said if we sent it back in, they would make sure it was jetted to the car's exact specs.
Ryan