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Dyno'd 383 for the first time
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86GN
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1990 Chevrolet Corvette

PostPosted: Sun Aug 04, 2002 8:24 am    Post subject: Dyno'd 383 for the first time Reply with quote

Went to New England Dyno tuning with this new motor for the first time yesterday. Made one pull. 350 rwhp, 388 rwtq. My chip burning equipment wasn't cooperating with me so I wasn't able to fatten it up.

Was dangerously lean - 13.8:1 @ 5300.

It's going to be interesting to see how much more I can get out of this combo.

It's a 1 piece seal 383 in a '90 corvette. Scat 9000 crank, 6" I beam rods, KB hypereutectic pistons (flat top, 8cc ? trough valve relief), Canfield 200 cc intake runner heads with 62 cc cambers, 2.10 intake, 1.6 exhaust valves, Comp Hydraulic roller cam, 224/236, 114 lsa, .510 / .520 @ .050", 1.52 ratio roller rockers, 1 3/4" Hooker Super Comp headers, dual 3" exhaust w/ x pipe, ported SuperRam intake (base, runners, box).

Compression now works out to be 11.25:1. WOT timing is set at 25 degrees because of knock using 94 unleaded. Part throttle, light cruise maxes at 41 degrees.

I'm gonna fatten it up in another chip and get my own wideband working to test with now. Then the interesting thing is going to be how much it'll pick up using 104 unleaded and putting timing back into it.

Then will be a split set of 1.6 rockers. Comp originally recommended 1.6's on the intakes, Desktop Dyno didn't like the idea.

This engine has ALL the original accessories on it - AC, air pump, it's all there, and functional. First car in years I can say that about. Damn I must be getting old. Laughing
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Sun Aug 04, 2002 10:16 pm    Post subject: Reply with quote

Wow! great numbers with that tune alone you should be in the 11's. I'll be interested to see how much power you pick up when the race gas is in and the timing / fuel is correct.

What happened to the AFRs? I thought you were going to use them on this motor.

I have no idea the cc's for the Kieth Black piston but I'll search around and see what I can come up with. Was that rotating assembly a kit from somebody?


Last edited by SMOKEmUP on Mon Aug 05, 2002 3:28 pm; edited 1 time in total
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86GN
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1990 Chevrolet Corvette

PostPosted: Mon Aug 05, 2002 7:48 am    Post subject: Reply with quote

Quote:
What happened to the AFRs? I thought you were going to use them on this motor.



They got sold for some quick cash when I was buying the T-Type. They are going onto a friend's 383. That was the first one that I had put together. It was balanced to a flex plate and didn't have the longer rods in it, so a mutual friend of the shop owner and mine bought that short block.

The Canfields came off Ebay.

The rotating assembly was supplied by the machine shop.
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1979 Chevrolet Camaro

PostPosted: Mon Aug 05, 2002 9:23 am    Post subject: Reply with quote

Are the Canfields stock, any port work to them? Do they come with 2.1" intake valves?

What's the piston to head clearance, aka quench height?

How does the car go in general? I'll bet it runs mint.
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86GN
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1990 Chevrolet Corvette

PostPosted: Mon Aug 05, 2002 11:41 am    Post subject: Reply with quote

They've had bowl work done to them. Stock they came with 2.05's. The previous owner had the 2.10's installed. I also polished the chambers. The pistons are .005" out of the hole. Quench height is .034" to .036". I've gotten different info on the compressed height of the FelPro 1010 head gaskets.

Ehh, the car goes OK. Not Buick fast, but OK. Laughing

She sure does sing prettier than the 6 cylinder. Very Happy
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Mon Aug 05, 2002 12:53 pm    Post subject: Reply with quote

Fyi... I did a search and found this page http://www.kb-silvolite.com/page30.htm for piston relief volume. I don't see a 6 inch rod listed for the 383 combo. I'm guessing you have part # KB106, 7cc relief.

I think going ok is an understatement.

I've toyed with the idea of building a similiar motor for camaro many times. But to make the pig move it needs boost. (or a for sale sign Shocked )

On a side note what is the max compression you've seen work on 93 octane gasoline motor?
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86GN
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1990 Chevrolet Corvette

PostPosted: Mon Aug 05, 2002 8:48 pm    Post subject: Reply with quote

Quote:
On a side note what is the max compression you've seen work on 93 octane gasoline motor?


12.5:1 on a late model LT1.

This one's got a ways to go before I get a good handle on it. I'm pretty sure there's a good bit left in it. Very Happy
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SMOKEmUP
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1979 Chevrolet Camaro

PostPosted: Tue Aug 06, 2002 8:37 pm    Post subject: Reply with quote

I'm sure with you at the tune it'll be flying much higher. We're you trying to run this motor on 93 octane gas or was race gas the plan all along?
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86GN
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1990 Chevrolet Corvette

PostPosted: Tue Aug 06, 2002 10:35 pm    Post subject: Reply with quote

I was trying to see how far I could push the envelope.
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PostPosted: Tue Aug 06, 2002 10:37 pm    Post subject: Reply with quote

Did you push the envelope too far? Or can you reel it back in?
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86GN
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1990 Chevrolet Corvette

PostPosted: Wed Aug 07, 2002 7:09 am    Post subject: Reply with quote

I don't think I've pushed it too far yet. As it is, the plugs aren't in their happy place. The motor wants more timing and the plugs aren't showing detonation.

The computer is another story. I've got some rocker arm to valve cover contact thats setting off the knock sensor.

Now all I need to do is to replace the half shaft that I twisted last night. Shocked
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PostPosted: Wed Aug 07, 2002 11:23 am    Post subject: Reply with quote

Are those the center bolt valve covers? Do they make tall center bolt valve covers.
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86GN
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1990 Chevrolet Corvette

PostPosted: Wed Aug 07, 2002 11:38 am    Post subject: Reply with quote

Perimeter.
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1979 Chevrolet Camaro

PostPosted: Wed Aug 07, 2002 12:43 pm    Post subject: Reply with quote

I'm pretty sure I have a set of tall chrome ones (with baffle) if you want them.
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86GN
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1990 Chevrolet Corvette

PostPosted: Wed Aug 07, 2002 1:09 pm    Post subject: Reply with quote

The rocker arms are hitting the sides of the covers. I've got tall cast aluminum ones on there already.
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