Hello! Log in or Register   |  Help  |  Donate  |  Buy Shirts See all banner ads | Advertise on TheSamba.com  
TheSamba.com
 
Cb 2280 cam and ratio rocker
Page: 1, 2  Next
Forum Index -> Performance/Engines/Transmissions Share: Facebook Twitter
Reply to topic
Print View
Quick sort: Show newest posts on top | Show oldest posts on top View previous topic :: View next topic  
Author Message
bearwin
Samba Member


Joined: December 16, 2004
Posts: 284
Location: san diego,california
bearwin is offline 

PostPosted: Mon Jun 22, 2015 1:57 am    Post subject: Cb 2280 cam and ratio rocker Reply with quote

I will be helping a friend to build his mild 1776 engine, he will be using dual port heads mildly ported stock valves, cb cheater cam, dual 40idf, 1 3/8 headers and muffler
Will the engine benefit if we will add 1.25 rockers? Will it be compatible to the cheater cam?
Thanks! What are the pros and cons?
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Boolean
Samba Member


Joined: January 19, 2012
Posts: 1712
Location: Stockholm
Boolean is offline 

PostPosted: Mon Jun 22, 2015 3:16 am    Post subject: Reply with quote

I would go more radical on the cam instead.
_________________
I strive for perfection. Excellence will not be tolerated!
Build thread here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=529379
Back to top
View user's profile Send private message Gallery Classifieds Feedback
vugbug68
Samba Member


Joined: June 25, 2006
Posts: 2696
Location: sacramento
vugbug68 is offline 

PostPosted: Mon Jun 22, 2015 9:51 am    Post subject: Reply with quote

Yeah that cam is pretty small, CB have a bunch of cams for mild small displacement engines.

Any of these cams would be a better choice
http://www.cbperformance.com/searchresults.asp?cat=186

But yes you can run 1.25 rockers with the 2280
_________________
71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
[email protected]
Samba Member


Joined: August 03, 2002
Posts: 12785
Location: Salt Lake City, Utah
john@aircooled.net is offline 

PostPosted: Mon Jun 22, 2015 9:54 am    Post subject: Reply with quote

the whole purpose of the "Cheater" cam is to retain the stock carb. If you are not going to do that, then there are far better cam options out there.
_________________
It's just advice, do whatever you want with it!

Please do NOT send me Private Messages through the Samba PM System (I will not see them). Send me an e-mail to john at aircooled dot net

"Like" our Facebook page at
http://www.facebook.com/vwpartsaircoolednet
and get a 5% off code for use on one order for VW Parts ON OUR PARTS STORE WEBSITE, vwparts.aircooled.net
Back to top
View user's profile Send private message Send e-mail Visit poster's website Facebook Gallery Classifieds Feedback
bearwin
Samba Member


Joined: December 16, 2004
Posts: 284
Location: san diego,california
bearwin is offline 

PostPosted: Mon Jun 22, 2015 10:04 am    Post subject: Reply with quote

parts are already there, we dont want to spend more to replace cam, my question is, are we just going to leave the cheater cam alone and not install the 1.25 ratio rockers? is it worth the effort of valve geometry adjustment?
thanks
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Boolean
Samba Member


Joined: January 19, 2012
Posts: 1712
Location: Stockholm
Boolean is offline 

PostPosted: Mon Jun 22, 2015 10:20 am    Post subject: Reply with quote

If you really must keep that cam, yes - go for ratio rockers.
_________________
I strive for perfection. Excellence will not be tolerated!
Build thread here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=529379
Back to top
View user's profile Send private message Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26740
Location: Colorado Springs
modok is offline 

PostPosted: Mon Jun 22, 2015 4:43 pm    Post subject: Reply with quote

Stock rockers
I tried it once and the only thing noticeable was more racket.

use a web 218!!!
Back to top
View user's profile Send private message Gallery Classifieds Feedback
mark tucker
Samba Member


Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
mark tucker is offline 

PostPosted: Mon Jun 22, 2015 5:33 pm    Post subject: Reply with quote

I guess it would deepend on whoo what where and when and what else you have/doo to it. if it just makes more racquett you might want to find a new line of work Shocked Rolling Eyes
Back to top
View user's profile Send private message Gallery Classifieds Feedback
modok
Samba Member


Joined: October 30, 2009
Posts: 26740
Location: Colorado Springs
modok is offline 

PostPosted: Mon Jun 22, 2015 5:55 pm    Post subject: Reply with quote

mark tucker wrote:
I guess it would deepend on


so how deaf are you?

Vw is a great car for the hearing impaired LOL

cheater is a LOW rpm cam. Tractor.
do tractors need high valve lifts? usually no
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Boolean
Samba Member


Joined: January 19, 2012
Posts: 1712
Location: Stockholm
Boolean is offline 

PostPosted: Mon Jun 22, 2015 6:16 pm    Post subject: Reply with quote

The cheater cam is too tame for the rest of the stuff. Anything that makes it wilder would be a benefit. I guess ratio rockers will not make it an Engle 120, but I would definitely want to try it.
The basic problem is a bad choice of cam.
_________________
I strive for perfection. Excellence will not be tolerated!
Build thread here:
http://www.thesamba.com/vw/forum/viewtopic.php?t=529379
Back to top
View user's profile Send private message Gallery Classifieds Feedback
bearwin
Samba Member


Joined: December 16, 2004
Posts: 284
Location: san diego,california
bearwin is offline 

PostPosted: Mon Jun 22, 2015 6:16 pm    Post subject: Reply with quote

Will i shorten the pushrods? If yes, how much? Is it worth the effort? Hp gains?
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
vugbug68
Samba Member


Joined: June 25, 2006
Posts: 2696
Location: sacramento
vugbug68 is offline 

PostPosted: Mon Jun 22, 2015 8:54 pm    Post subject: Reply with quote

You will probably have to shorten the pushrods but its impossible to know how much without doing a mock up first. Worth it? well you have to do the work to set up rocker geometry anyway, so why not use the 1.25's. But that cam doesn't have enough duration to get the power out of a 1776 with 40 idf's
_________________
71 Super - Backroad Thrasher
66 Corvair - Weekend Cruiser
90 4 Runner - Muddin
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
mark tucker
Samba Member


Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
mark tucker is offline 

PostPosted: Mon Jun 22, 2015 9:41 pm    Post subject: Reply with quote

modok wrote:
mark tucker wrote:
I guess it would deepend on


so how deaf are you?

Vw is a great car for the hearing impaired LOL

cheater is a LOW rpm cam. Tractor.
do tractors need high valve lifts? usually no
just enough to be able to hear when somebody has a afu valvetrain and has gone off the deepend.witch is usualy when they realy dont have a effing clue as to what there baballing or doing. is that deff enough.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Alstrup
Samba Member


Joined: July 12, 2007
Posts: 7179
Location: Videbaek Denmark
Alstrup is offline 

PostPosted: Tue Jun 23, 2015 11:49 am    Post subject: Reply with quote

Will 1,25 rockers aid in performance with a 2280 cam ?
Answer to that is yes, - if the heads flow decent. The 2280 is a under rated cam in more than one way.
If the heads flow well, the 1,25īs will aid in both hp and torque from about 2500 rpm & up. Also it will extend the power band with about 250 rpm.
Wrt the valve train rattle I kinda agree and then not. I have noticed several times that there is no need to run 0,10/0,15 mm lash with that cam, -. and other cams too (with ally PRīs that is.)
Also, if you set the DCR after the added lift you can gain even more torque.
The claims of 88-95 hp on 1800 cc engines with this cam is not overrated when the engine is done right.

T
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
pedmick
Samba Member


Joined: June 24, 2004
Posts: 49
Location: Manteca
pedmick is offline 

PostPosted: Sat Mar 06, 2021 6:33 pm    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

I have a 2280 cam and 1.25:1 rockers on my 1968cc single port. I can't stand the valve train chatter. I think I'm going to try 1.1:1 to see if it helps. I can sacrifice the minimal hp gains...
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Alstrup
Samba Member


Joined: July 12, 2007
Posts: 7179
Location: Videbaek Denmark
Alstrup is offline 

PostPosted: Sat Mar 06, 2021 7:53 pm    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

Adjust the side travel on the rocker arms, use Ally PRīs and do a proper valve tolerance adjustment. End of story.
_________________
https://www.thesamba.com/vw/forum/viewtopic.php?t=435993
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Alstrup
Samba Member


Joined: July 12, 2007
Posts: 7179
Location: Videbaek Denmark
Alstrup is offline 

PostPosted: Tue Mar 09, 2021 4:41 am    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

pedmick wrote:
I have a 2280 cam and 1.25:1 rockers on my 1968cc single port. I can't stand the valve train chatter. I think I'm going to try 1.1:1 to see if it helps. I can sacrifice the minimal hp gains...

PS. just came to mind. - If you are using the Mazda style adjusters they will aid in valve train noise too. Use the Porsche style instead.
_________________
https://www.thesamba.com/vw/forum/viewtopic.php?t=435993
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
pedmick
Samba Member


Joined: June 24, 2004
Posts: 49
Location: Manteca
pedmick is offline 

PostPosted: Tue Mar 09, 2021 8:14 am    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

Good call! I am using Mazda style adjusters. I'm never totally convinced that I adjust the lash on the flat part of the ball. I also switched to CB HD aluminum pushrods. I'll take another look at the rocker side clearance...seems to "loosen up" on its own.
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
mark tucker
Samba Member


Joined: April 08, 2009
Posts: 23937
Location: SHALIMAR ,FLORIDA
mark tucker is offline 

PostPosted: Tue Mar 09, 2021 9:52 am    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

I would just tighten the side play to .002"~ .004" and be sure the rocker geo is right or close to right.if using the oe pushrods style tips they can bind in the rocker and cause a false lash setting. I would leave the mazda lash adjusters. and use at least 2 .020" or thicker hard shims on the thrust side of each rocker.shims under .015" should only be used on the non thrust side of the rocker.or between 2 thick shims, and only hardened shims should be used. do not ever use serrated valve spring shims. if you have the spring clips& springs get rid of them. I suppose non hardenend shims can be used on the non thrust side, but I wouldn't unless it was a emergency or testing.
Back to top
View user's profile Send private message Gallery Classifieds Feedback
Alstrup
Samba Member


Joined: July 12, 2007
Posts: 7179
Location: Videbaek Denmark
Alstrup is offline 

PostPosted: Tue Mar 09, 2021 10:26 am    Post subject: Re: Cb 2280 cam and ratio rocker Reply with quote

mark tucker wrote:
I would just tighten the side play to .002"~ .004" and be sure the rocker geo is right or close to right.if using the oe pushrods style tips they can bind in the rocker and cause a false lash setting. I would leave the mazda lash adjusters. and use at least 2 .020" or thicker hard shims on the thrust side of each rocker.shims under .015" should only be used on the non thrust side of the rocker.or between 2 thick shims, and only hardened shims should be used. do not ever use serrated valve spring shims. if you have the spring clips& springs get rid of them. I suppose non hardenend shims can be used on the non thrust side, but I wouldn't unless it was a emergency or testing.

I go to the tight side if I possibly can. Loose zero to 0,002"
_________________
https://www.thesamba.com/vw/forum/viewtopic.php?t=435993
Back to top
View user's profile Send private message Send e-mail Gallery Classifieds Feedback
Display posts from previous:   
Reply to topic    Forum Index -> Performance/Engines/Transmissions All times are Mountain Standard Time/Pacific Daylight Savings Time
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

About | Help! | Advertise | Donate | Premium Membership | Privacy/Terms of Use | Contact Us | Site Map
Copyright © 1996-2023, Everett Barnes. All Rights Reserved.
Not affiliated with or sponsored by Volkswagen of America | Forum powered by phpBB
Links to eBay or other vendor sites may be affiliate links where the site receives compensation.