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 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
oregonchevelle
Member


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



PostPosted: Mon Feb 27, 2006 1:03 am    Post subject: 1.5 stock to 1.6 roller rockers? Reply with quote

--------------------------------------------------------------------------------

I have pretty good heads. They are TFS aluminum with 2.20/1.60 valves. Cam is 454 lift and 216 duration. Would I likely see any benefit going from 1.5 stock to 1.6 roller rockers. Also this will change my lift to about 484, the info on the heads say the springs I have in now are good up to 480 lift. Will they still be o.k. at 484?

_________________
1966 Chevelle
Back to top
View user's profile Send private message
William Jones
Member


Joined: 30 Jan 2006
Posts: 823
Location: Lake city, FL
28541.86 points


1971 Ford Mustang

PostPosted: Mon Feb 27, 2006 6:37 am    Post subject: springs Reply with quote

That is goin to depend alot on installed height of the spring. You can remove the spring and get gauge that checks the installed height. If it is less than the suggested installed height then you might be ok but you don't want to be wrong with this bad things happen if you get coil bind on the springs.
_________________
Take the horse out off the barn and let her RUN BABY RUN!!!!!

92 LX 454ci Clevor 9.24@142.53 N/A
71 Mach1 454ci Clevor 10.16@134 N/A 3850lbs race weight "Lost in fire"
03 Cobra Bone stock 12.42
68 Falcon 363ci 10.55@126 N/A
95 GT 363ci 11.08@118 N/A
Back to top
View user's profile Send private message
wheelz
Newbie


Joined: 07 Oct 2005
Posts: 11

342.28 points


1967 Chevrolet Chevy II

PostPosted: Tue Feb 28, 2006 10:23 am    Post subject: 1.5 stock to 1.6 rollers Reply with quote

The number for max lift on your springs sounds real low. If I am not mistaken even stock SBC springs can handle 500 lift. If you are worried about it, just go to a full 1.5 roller rocker (roller fulcrum) and you wont believe the difference. I had a similar cam in a 350 and installing just roller tip rockers the car picked up .3 sec.
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 Feb 28, 2006 4:53 pm    Post subject: Reply with quote

The only way to know is to check and see if they are in coil bind or not.

Are you sure that's the rating for those springs? It does sounds a bit on the low side.
Back to top
View user's profile Send private message Visit poster's website
oregonchevelle
Member


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



PostPosted: Tue Feb 28, 2006 10:18 pm    Post subject: Reply with quote

Just got info from Trick Flow. They said they are good to .500 lift. My mechanic says I would be better off with some different springs anyway. Some a little stiffer I think he said. thanks for the advice guys.
_________________
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: Wed Mar 01, 2006 4:22 pm    Post subject: Reply with quote

Trick Flow's response indicates the springs will work for you application, correct? If so why not use them?
Back to top
View user's profile Send private message Visit poster's website
af2
Member


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


1933 Willys Coupe

PostPosted: Wed Mar 01, 2006 9:43 pm    Post subject: Reply with quote

I have another question. I have run 1.6 roller arms and have seen no difference in any times on the quarter mile. It goes back to cam grinder and what the ratio was set for. People say they will add 30 plus HP BuTT.. it wont. You can call any good ( I mean good) cam grinder and get the same response. My 2 cents for what is worth.
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 01, 2006 10:29 pm    Post subject: Reply with quote

I could use them I guess? He just said he did not think they were enough. As for the 1.6 rockers I too have heard both things. Some say yes they help others say not worth the money. I may or may not go with them.
_________________
1966 Chevelle
Back to top
View user's profile Send private message
Smokin71RSSS
Member


Joined: 11 Jul 2002
Posts: 111
Location: Pasadena, Ca
2020.86 points


1971

PostPosted: Wed Mar 01, 2006 11:22 pm    Post subject: Reply with quote

When did you buy the heads and what model are they. The TFS spring setups have changed starting last year. Also if your dealing with the G1 or 2 head you have to watch out with valve to piston clearance because of the non stock valve configuration.

Improvement with a 1.6 rocker swap is pretty much a hit and miss thing. If it works with your combination then so be it. If it doesn't then, well....

Personally I think you might see an improvement since their are some decnt flow #'s for most TFS heads from .4"-.5" lift. You should also try putting the 1.6's on just the exhaust valves and keep 1.5 for the intake. Usually that is the combination that works well with most combinations I've seen. Hell try it the other way around to. You never know till you do it.
Back to top
View user's profile Send private message Visit poster's website
oregonchevelle
Member


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



PostPosted: Wed Mar 01, 2006 11:27 pm    Post subject: Reply with quote

The heads came on the car and I think the motor was put in in like 2000? But I know it is a Generation I motor. They are older heads because I do not think they make these anymore? TFS 31400001.
_________________
1966 Chevelle
Back to top
View user's profile Send private message
Smokin71RSSS
Member


Joined: 11 Jul 2002
Posts: 111
Location: Pasadena, Ca
2020.86 points


1971

PostPosted: Thu Mar 02, 2006 1:32 am    Post subject: Reply with quote

Those are TFS G1 or G2 Twisted Wedge heads so becareful with valve to piston clearance. I don't think you'll have a problem with .484" lift, but it might be best to check. I have no real info on what they ran for spring setups. You can give TFS a call to find out. I'm thinking they were the same as the older TFS 23* heads. There were only 3 springs = 1.25" OD (.520" Lift) - 1.44" OD (.540" Lift) - 1.46" OD (.600" Lift). If your running any of these springs I listed you will be fine with .484" lift.
Back to top
View user's profile Send private message Visit poster's website
oregonchevelle
Member


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



PostPosted: Thu Mar 02, 2006 1:54 am    Post subject: Reply with quote

springs are seat pressure 100# @ 1.700

Open Pressure is 290# @ 1.180

Outside Diameter is 1.264

Inside Diameter is .880

Installed Height is 1.700

_________________
1966 Chevelle
Back to top
View user's profile Send private message
73RS
Newbie


Joined: 19 Dec 2005
Posts: 19
Location: Gonzales LA
710.42 points



PostPosted: Thu Mar 02, 2006 7:39 am    Post subject: Reply with quote

Your good then, your open pressure is set at .520 lift they usually will set that well before coil bind. Usually there is a coil bind listing or max lift also listed.
Back to top
View user's profile Send private message
coppergmc
Member


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



PostPosted: Sun Mar 05, 2006 10:33 am    Post subject: Reply with quote

David Vizard wrote, "Typically, cams around 260-280 degrees on 110-114 degree LCAs will respond well, especially if in a 350. Such timing and LCAs cover most of the range of off-the-shelf cams. Under these circumstances you can expect a power increase typical of that shown in figure 11.2." Figure 11.2 is a graph showing a test performed on a 350 with a change from 1.5 stock rockers to Comp's 1.6 roller tips. It shows that the engine made 16hp more with the 1.6 rockers. Vizard wrote 2 pages on swapping rocker ratios. On your engine with the TF heads, you should notice a difference. If you had a different cam and crappy heads, it probably would make a difference at all. Just thought I would share that. 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: Sun Mar 05, 2006 5:32 pm    Post subject: Reply with quote

Hmm I did not see that book. I have a couple of his books. That is good news! Thanks.
_________________
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 1, 2, 3  Next
Page 1 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