Home | Register | Login | Contact Us

 
Auto Math
Classifieds
Forum
Gallery
Games
Garage
Tech Articles
Utilites
 
FAQFAQ    SearchSearch    RegisterRegister    Log inLog in    Log in to check your private messagesLog in to check your private messages    Forum Subscriptions1/4 Mile Table 

sbc 383
Goto page 1, 2  Next
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Chevy - Small Block Gen 1
View previous topic :: View next topic  
Author Message
big_G
Member


Joined: 01 Dec 2005
Posts: 41
Location: Hutto, Tx.
1440.12 points


1968 Chevrolet Corvette

PostPosted: Thu Dec 01, 2005 10:38 pm    Post subject: sbc 383 Reply with quote

Hi guys..my dilema is my 383 is only making 330 rwtq and 330 rwhp. Dyno shows cam is still pulling strong at 6,500. Combo is as follows: Vic. jr heads, vic. jr. intake, holley 750 dp, 10.3:1 cr, 6 in. rods, Crower solid roller cam, (250/252 @ .050, .570/.574 lift, lsa 112*, installed on lobe centerline 108*.) I'm thinking the cam is too damn big. Maybe the heads too. Any thoughts? TYIA
_________________
Honey, I don't know how those black marks got on the driveway.
http://s19.photobucket.com/albums/b156/big_G1/?action=view&current=07110516-1.flv
Back to top
View user's profile Send private message Send e-mail
Hanz
Moderator


Joined: 14 Mar 2003
Posts: 444
Location: Casselberry, FL
4953.56 points


2003 Dodge Ram

PostPosted: Thu Dec 01, 2005 10:50 pm    Post subject: Reply with quote

Seems like a decent combo that should be making at least 425 or more hp/ftlbs. Although CR could be higher.

You sure the dyno is correct? How does it compare with 1/4 mile results?

Hanz

_________________
www.hanzenginehouse.com
Back to top
View user's profile Send private message Visit poster's website
big_G
Member


Joined: 01 Dec 2005
Posts: 41
Location: Hutto, Tx.
1440.12 points


1968 Chevrolet Corvette

PostPosted: Thu Dec 01, 2005 11:08 pm    Post subject: Reply with quote

Dyno is correct..1/4 mile times in the 12.4 range...same as with the 327 I had in it before..yes, the cr. is low for both the cam and heads. I am thinking I can pick up a bunch of torque and hp by going to a 232/240 duration cam.
_________________
Honey, I don't know how those black marks got on the driveway.
http://s19.photobucket.com/albums/b156/big_G1/?action=view&current=07110516-1.flv
Back to top
View user's profile Send private message Send e-mail
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Fri Dec 02, 2005 7:16 pm    Post subject: Reply with quote

Did you change anything else? Trans converter etc on the drivetrain?
Back to top
View user's profile Send private message
big_G
Member


Joined: 01 Dec 2005
Posts: 41
Location: Hutto, Tx.
1440.12 points


1968 Chevrolet Corvette

PostPosted: Fri Dec 02, 2005 9:38 pm    Post subject: Reply with quote

Not a single change....just the engine.
_________________
Honey, I don't know how those black marks got on the driveway.
http://s19.photobucket.com/albums/b156/big_G1/?action=view&current=07110516-1.flv
Back to top
View user's profile Send private message Send e-mail
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Wed Dec 14, 2005 9:06 pm    Post subject: Reply with quote

The 383 motor has more torque as compared to the 327. The converter should have more stall. It sounds as if you killed the motor with cam choice.
Back to top
View user's profile Send private message
big_G
Member


Joined: 01 Dec 2005
Posts: 41
Location: Hutto, Tx.
1440.12 points


1968 Chevrolet Corvette

PostPosted: Thu Dec 15, 2005 9:27 am    Post subject: Reply with quote

I agree, and Comp Cams recommended a 12-771-8,(XR280R) which is beign ground today.
_________________
Honey, I don't know how those black marks got on the driveway.
http://s19.photobucket.com/albums/b156/big_G1/?action=view&current=07110516-1.flv
Back to top
View user's profile Send private message Send e-mail
tirefryin_s10
Member


Joined: 03 Dec 2003
Posts: 70
Location: edmonton,alberta/canada
1925.12 points


1981 Mazda RX-7

PostPosted: Thu Dec 15, 2005 10:17 am    Post subject: Reply with quote

i know a buddy who runs the exact same set up but in a 406 but he runs a solid roller around 610 lift and has just about 11.5-1 compression the big duration solid cam bleeds off the extra compression and it drinks a steady dose of 91 octane fuel id guess its in the 550-600 hp range by the times its running -just somthing to chew on ... those heads need big compression and a big cam
Back to top
View user's profile Send private message MSN Messenger
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Thu Dec 15, 2005 5:29 pm    Post subject: Reply with quote

Let us know how it runs. That cam should help big time. The heads unported are pretty tame compared to some I've seen. Best of luck.
Back to top
View user's profile Send private message
coppergmc
Member


Joined: 19 Dec 2005
Posts: 278
Location: Georgia
5857.30 points



PostPosted: Mon Dec 26, 2005 8:45 am    Post subject: Reply with quote

330 hp and tq at the rear wheels isn't that bad. If you figure that you are loosing anywhere from 20% to 30% through your driveline, you are making anywhere from 412 to 471 hp at the crank. That's not that bad and that cam isn't that big. You could try advancing the cam a little. Did you degree the cam to make sure things are where they are supposed to be?
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Mon Dec 26, 2005 2:00 pm    Post subject: Reply with quote

He installed it @ 108 lobe center.
Back to top
View user's profile Send private message
coppergmc
Member


Joined: 19 Dec 2005
Posts: 278
Location: Georgia
5857.30 points



PostPosted: Tue Dec 27, 2005 10:35 am    Post subject: Reply with quote

He should be double checked. You might even want to advance the cam a few degrees. Check your cranking compression. If it seems a little low, somewhere around 155psi or less, I would advance the cam about 4 degrees. I would be willing to bet that your cranking compression is very low. The good thing about advancing the cam is that it doesn't cost anything except maybe some rtv and gaskets. coppergmc
Back to top
View user's profile Send private message
Big Dave
Moderator


Joined: 04 Dec 2005
Posts: 2646
Location: Tampa Florida
119973.02 points



PostPosted: Tue Dec 27, 2005 11:33 am    Post subject: Put my money were my cam is Reply with quote

I have a Manley reinforced 4 bolt 406 held together with ARP studs, with a non-twist 4340 forged Eagle crank, Eagle 4340 H-beam six inch rods, JE Sportsman forged 11.5:1 flat tops running Edelbrock Victor Jr heads, and Edelbrock Air Gap RPM manifold with an 850 cfm Holley carb.

My choice of cams is a CompCams Extreme Energy hydraulic roller 224/230 .502"/.510" 110 LCA and the dyno sheet maxes out at 6400 rpm at 513 hp and 513 Lbs Ft torque at 4800 RPM.

With a 3400 RPM stall converter pushing my 700R4 trans, and 3.73 gears I can get my 4300 pound Caprice into the mid 11's. That I have learned is as fast as I want to go on the street; though as you can see by my choce of parts, I can always throw 350 hp of two stage NOS at it if I feel the urge without worrying about breakage (of the engine any way).

Big Dave
Back to top
View user's profile Send private message
coppergmc
Member


Joined: 19 Dec 2005
Posts: 278
Location: Georgia
5857.30 points



PostPosted: Tue Dec 27, 2005 12:51 pm    Post subject: Reply with quote

Sounds like you have a great setup. I need an engine like that in my S-10. I was concerned more with cylinder pressure than theoretical compression ratio. I think my cam must have an early closing point. When I degreed the cam, I installed it at 107* intake centerline when the manufacturer called for 108*. You wouldn't think that 1 degree would make a difference in overall cylinder pressure. coppergmc
Back to top
View user's profile Send private message
af2
Member


Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Tue Dec 27, 2005 8:59 pm    Post subject: Reply with quote

As long as the valve to piston clearance is still sufficient 4 degrees will help the low end but not fix his problem. I still feel the static compression is to low for the cam he is running. I can't see any good cylinder pressure by advancing that cam with his compression.
Back to top
View user's profile Send private message
Display posts from previous:   
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Chevy - Small Block Gen 1 All times are GMT - 5 Hours
Goto page 1, 2  Next
Page 1 of 2

 
Jump to:  
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum
Home | Contact Us | Automath | Cam Files | Dyno Search | Forum | Garage | Picture Gallery | Reaction Timer

Copyright 1997-2016 SMOKEmUP.com All rights reserved.
Advertising Info     Disclaimer     Privacy Policy