Fordmods Logo

Changing cam to lower dynamic comp? 

 

Page 1 of 1 [ 7 posts ] 

 
 Post subject: Changing cam to lower dynamic comp?
Posted: Mon Feb 09, 2009 8:16 pm 
Getting Side Ways
Offline

Age: 108

Posts: 927

Joined: 27th Sep 2007

Location: Adelaide
SA, Australia

Is it possible for me to get a cam that would lower my dynamic compression?
I have an ef auto with an au head,cam and gasket, extractors and exhaust, vernier cam gear and 3.45 diff.
The reason i wish to lower the comp is to fight my pinging problem i cant get rid of.
Ive read about raising dynamic comp with cam choice so i thought maybe you could go the other way and lower it.
Wasnt sure wether to post here or in the wade cams section.

 

_________________

165 Killer Wasps all packaged in a green kmart car, almost an explorer in a way...

Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Mon Feb 09, 2009 9:35 pm 
Fordmods Junkie
Offline
User avatar

Posts: 3083

Joined: 22nd Sep 2005

Gallery: 13 images

Ride: EF

Location: Melbourne
VIC, Australia

i recently had a heavy pinging problem on my car after upping the compression.

some things to look at.
-service all filters
-98 octane fuel
-more cold air
-Injectors (bigger, or reco)
-Vacuum leaks (was the main cause of my problem)

as finding what is actually causing your pinging might be more benificial.

 

_________________

Image
latest mod: A Service
MY BUILD THREAD

Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Mon Feb 09, 2009 9:47 pm 
Oompa Loompa
Offline

Age: 35

Posts: 20

Joined: 10th Feb 2005

Location: Melbourne
VIC, Australia

Are you running 98 octane? Generally the bigger the cam the more compression you can run.
Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Mon Feb 09, 2009 10:02 pm 
Smokin em up
Offline

Age: 32

Posts: 251

Joined: 1st Jul 2006

Ride: EBII Fairmont 4.0 206rwkw

Location: Adelaide
SA, Australia

Ive got a minor pinging prob myself. Had timing took out where it was happening (always around 3000-4000rpm) but still there. And i run 98. Tried different 98's to see if it was just one brand.
Im gonna run my EB on E85 to hopefully permanatly get rid of the pinging.

 

_________________

EBII Fairmont = 206rwkw
EL Fairmont = Daily

Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Tue Feb 10, 2009 10:57 am 
Getting Side Ways
Offline

Age: 108

Posts: 927

Joined: 27th Sep 2007

Location: Adelaide
SA, Australia

Does anyone know about how cams work in relation to raising/lowering comp and if it is possible?

 

_________________

165 Killer Wasps all packaged in a green kmart car, almost an explorer in a way...

Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Tue Feb 10, 2009 12:49 pm 
Getting Side Ways
Offline

Age: 108

Posts: 927

Joined: 27th Sep 2007

Location: Adelaide
SA, Australia

Just got back from my engine machinist and he says im chasing a unicorn, said it is possible but mainly used in conjunction with race motors and not to worry about it.
I may just go back to a standard head gasket instead of the steel one, but im gonna do a comp test first to see if its higher than stock.

 

_________________

165 Killer Wasps all packaged in a green kmart car, almost an explorer in a way...

Top
 Profile  
 
 
 Post subject: Re: Changing cam to lower dynamic comp?
Posted: Tue Feb 10, 2009 2:04 pm 
Getting Side Ways
Offline

Posts: 2448

Joined: 5th Nov 2004

Gallery: 7 images

Location: Brisbane
QLD, Australia

WOuldnt it be cheaper for you to get a J3 chip and just back the timing off slightly?

Or.. .if its that high, go LPG. It should work nice!
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 7 posts ] 

Who is online

Users browsing this forum: No registered users and 20 guests


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 post attachments in this forum

 

 

It is currently Tue Dec 19, 2017 7:43 am All times are UTC + 11 hours

 

 

(c)2014 Total Web Solutions Australia - Australian Web Hosting and Domain Names