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 

1.5 stock to 1.6 roller rockers?
Goto page Previous  1, 2, 3  Next
 
Post new topic   Reply to topic    SMOKEmUP.com Forum Index -> Chevy - Small Block Gen 1
View previous topic :: View next topic  
Author Message
coppergmc
Member


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



PostPosted: Sun Mar 05, 2006 9:36 pm    Post subject: Reply with quote

That was his "How to build and modify camshafts and valve train" or whatever. It's a little harder read. Kinda like reading a government TM manual. He also stated that the 383 or larger engine would likely make even more power. Just a thought. Copper
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 Mar 06, 2006 6:15 pm    Post subject: Reply with quote

That is the reason I haven't have luck with the 1.6 swap. Good heads and cam are the heart of the motor anything else really is useless. A motor has to breath to make HP.
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 Mar 06, 2006 10:09 pm    Post subject: Reply with quote

There is nothing wrong with the TFS heads. The "low" lift of your cam isn't really taxing the heads at all. They flow well past what you have for a cam and your engine should make power with the added lift of 1.6 rockers. You might actually do better with a larger cam. I have been wanting to check out Lunati's Vodoo cams. Notice the more lift per duration at .050. The cams should make decent power. Copper
Back to top
View user's profile Send private message
oregonchevelle
Member


Joined: 19 Feb 2006
Posts: 64
Location: Oregon
2194.26 points



PostPosted: Tue Mar 07, 2006 12:54 am    Post subject: Reply with quote

Well I am looking to stay pretty streetable with this car. So how large a cam colud I go with my present engine and still stay easily streetable and yet increase my performance?
_________________
1966 Chevelle
Back to top
View user's profile Send private message
SMOKEmUP
PostMaster


Joined: 30 May 2002
Posts: 3169

65097.54 points


1979 Chevrolet Camaro

PostPosted: Tue Mar 07, 2006 1:48 am    Post subject: Reply with quote

Duration wise for a 350 small block a good street cam is less than 224 on the intake and the exhaust depends on the heads. That will give a nice lobe but idle quality is still reasonable. For the more race cam go with 230 @ 0.05". Anything over that on a chevy 350 is to much for daily street driving IMO. Also don't forget as you add more duration you effetively decrease the dynamic compression ratio of the engine where you need to add more static compression ratio to compensate.

Lift wise I would run something to the point just before where the flow curve drops off, for both intake and exhaust. For most SBC heads that's between .500" and .600" lift. Keep in mind though that as the valve lift increases the spring rates go up exponentially resulting in more frictional drag from the valve train.
Back to top
View user's profile Send private message Visit poster's website
66burban
Member


Joined: 25 Dec 2005
Posts: 49
Location: north dakota
1755.34 points


1966 Chevrolet Suburban

PostPosted: Tue Mar 07, 2006 8:56 pm    Post subject: Reply with quote

I have a clevite cam in my 350 with 280 290 adv. duration and 214 224 @ .050 on a 112 lc the lift is only .443 .465 and it pulls pretty hard up to about 5200, but I also have stock heads so your engine could pull further, plus I only have a performer intake which is only good to like 5500. It is very streetable, it will even idle at 500rpm and pull about 16" of vacuum. From what I have seen and been told the reason you want to put 1.6 on the exhuast only will be to make a single profile cam into a split profile cam, like mine. From my experiences adding lift to the exhuast and not intake will usually increase bottom end torque and sometimes, not always, lower the rpm where peak power is made. Im not saying there arent better cams out there, I am saying that this cam with no stall, 3.73 gears, 29 inch tall tires, moves my suburban out of the hole without bogging with all the traction I need, and it weighs just over 4,000lbs.
Back to top
View user's profile Send private message
coppergmc
Member


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



PostPosted: Wed Mar 08, 2006 11:00 am    Post subject: Reply with quote

You probably may have already posted the particulars of you engine and car. To keep me from going through all you posts, give me some info on converter, type of trans, intake, carb, make and model of vehicle, and tires. I can make an educated guess on the rest. I have catalogs from several different cam companies and would be glad to supply you with different cam options. I am partial to Comp and Lunati but also like some of Cranes, Crower, Isky, and Ultradyne's cams. Copper
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: Wed Mar 08, 2006 5:55 pm    Post subject: Reply with quote

As far as I know he is talking about pretty much stock heads. I can see an improvement in using the 1.6 in these heads. TFS is a different breed. I don't think you will gain what you are hoping for by switching. I have been wrong before but my thought on this is different.
Back to top
View user's profile Send private message
oregonchevelle
Member


Joined: 19 Feb 2006
Posts: 64
Location: Oregon
2194.26 points



PostPosted: Wed Mar 08, 2006 10:10 pm    Post subject: my combo Reply with quote

355 summit motor = Tirck flow heads, 64cc Chamber volume, 1.25 valve springs 2.02/1.60 valves, 13* intake 23* exhaust valve angles, Cam = 454 intake & Exhaust 216 Duration @.050 intake & exhaust. Hydraulic. Static compression is somewhere between 9.7-9.2. -12 or -15.7 dish pistons. -.001 Deck. .038 head gasket thickness.
_________________
1966 Chevelle
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: Wed Mar 08, 2006 10:27 pm    Post subject: Reply with quote

OK, If you have a sub exhaust flow then 1.6 will help. If you have a sub intake flow then 1.6 will help. Otherwise I would save my money and put it elsewhere where it will get more H.P. Those heads are a good flowing head for you're motor. I myself would not go to 1.6. But that is my belief. Good luck.
Back to top
View user's profile Send private message
oregonchevelle
Member


Joined: 19 Feb 2006
Posts: 64
Location: Oregon
2194.26 points



PostPosted: Wed Mar 08, 2006 10:44 pm    Post subject: Reply with quote

What is a sub flow?
_________________
1966 Chevelle
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: Wed Mar 08, 2006 10:59 pm    Post subject: Reply with quote

Inadequate flow.
Back to top
View user's profile Send private message
oregonchevelle
Member


Joined: 19 Feb 2006
Posts: 64
Location: Oregon
2194.26 points



PostPosted: Wed Mar 08, 2006 11:07 pm    Post subject: Reply with quote

oic Yeah I think my heads flow pretty good from what I read and other people tell me. Gears are my #1 priority. Just have to wait on someone else on those so I am thinking of other things I may want to do also.
_________________
1966 Chevelle
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: Thu Mar 09, 2006 6:39 pm    Post subject: Reply with quote

Hey what rear end are you running. I could help on gears untill you install a 12 bolt or hopefully better rear.

Last edited by af2 on Thu Mar 09, 2006 8:43 pm; edited 1 time in total
Back to top
View user's profile Send private message
oregonchevelle
Member


Joined: 19 Feb 2006
Posts: 64
Location: Oregon
2194.26 points



PostPosted: Thu Mar 09, 2006 6:44 pm    Post subject: Reply with quote

8.2 ten bolt. 3.08 gears! Yuck!
_________________
1966 Chevelle
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 Previous  1, 2, 3  Next
Page 2 of 3

 
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