Fordmods Logo

Largest cam possible for AU2 XR8 

 

Page 1 of 1 [ 13 posts ] 

 
 Post subject: Largest cam possible for AU2 XR8
Posted: Fri Jan 09, 2009 2:34 pm 
Fordmods Newbie
Offline

Age: 32

Posts: 7

Joined: 23rd Jul 2008

Ride: AUII XR8 Ute

Location: Bribie Island
QLD, Australia

what is the largest cam, we the owners of AU2 XR8's can fit to our engines before piston to valve clearance is an issue.

I am looking at an X303 FRPP cam for my ute but am unsure what level of lift is the maximum i can have before the pistons need to be flycut.

specs are:
M-6250-X303*
rocker ration: 1.60
Intake: 5° BTC 39° ABC 49°
Exhaust: BBC 5° BTC
Duration: | Lift:
286° 286° | .339 I .542 I
224° 224° | .339 E .542 E
Lobe Seperation: 107° 117°

Cheers guys, i couldn't find anything through the search function.
Top
 Profile  
 
 
Posted: Fri Jan 09, 2009 2:43 pm 
EFI Guru
Offline

Age: 52

Posts: 4289

Joined: 5th Nov 2004

Gallery: 28 images

Ride: 351 Vogue,XH 5.0,'17 5.0 Stang

Location: Perth
WA, Australia

The F303 is the largest..it has 512 lift and 228 @ 050.
My mates Capri uses one and it makes excellent power 330 rwhp at the peak with good torque through the rev range.
Top
 Profile  
 
 
Posted: Fri Jan 09, 2009 11:47 pm 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

depends on valve size etc..
The F303 is a GOOD cam..
TFS 1 also..
Lift is NOT the be all on valve clearance btw..
Std valve springs won't work either..

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
 
Posted: Sat Jan 10, 2009 3:51 pm 
Getting Side Ways
Offline
User avatar

Age: 33

Posts: 2058

Joined: 25th May 2006

Ride: ef xr8

Power: 229 rwkw

Location: Perth
WA, Australia

I have an AU2 5L motor with a comp cams XE270HR cam in it.

Very similar lift .512 and it goes very nicely indeed.

http://www.compcams.com/Cam_Specs/CamDe ... =1054&sb=2

Im not sure if its more or less aggressive though.

 

_________________

Because of Beer, Thirst is a Beautiful Thing!

'95 EF XR8 auto, Advance headers, 3" exhaust, Cobra manifold, BBK 75mm throttle body , 80MM Marauder MAF, Vortech V2 T Trim , 307 rwhp, 405 ft/lb 13.2 @ 105 MPH

Now N/A (permanent Lag) - AFR 165's, Comp XE270 cam, 1.6 RR - 269 rwhp 14.1 @ 102mph.

Top
 Profile  
 
 
Posted: Sat Jan 10, 2009 6:03 pm 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

I doubt much more lift .512 would net any more power with std heads..
In any case some clay on piston assemble head with old gasket assemble valve train , turn engine over and check thickness of clay..
Minimum is .080

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
 
Posted: Mon Jan 12, 2009 11:00 am 
Getting Side Ways
Offline
User avatar

Age: 33

Posts: 1239

Joined: 1st Jul 2005

Gallery: 9 images

Ride: EF XR8 & 2002 GSXR-1000

Location: Perth
WA, Australia

schnoods' engine has a set of AFR165s. Don't know if they are the competition editions or not though.

 

_________________

The fast fun: Suzuki GSXR1000
The one I use when I can't use the fast fun: Blown EF XR8

Top
 Profile  
 
 
Posted: Mon Jan 12, 2009 9:01 pm 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 2116

Joined: 13th Aug 2005

Gallery: 15 images

Ride: 1999 XHII XR8, 2002 AU Fairmont

Power: 236 rwkw

Location: Perth
WA, Australia

Yep schnoods engine has AFR165's with the Comp XE270HR-14 cam and 1.6 rockers.
On the AU 220kw engine (bottom end) 1.7 rockers could not be used with the above due to piston/valve clearance issues so they were swapped for 1.6's (was another mates engine with same combo)

 

_________________

STREETBUILT RACING
1999 XHII Falcon XR8 Ute 5.0L, TKO600 5spd, KB 2.1L Blower, 6.5psi, 12.2@113mph!!

Top
 Profile  
 
 
Posted: Mon Jan 12, 2009 11:54 pm 
Stock as a Rock
Offline
User avatar

Age: 31

Posts: 150

Joined: 10th Mar 2008

Ride: ED EF and AU V8s

Location: Perth
WA, Australia

does it make any difference to run a bigger cam with smaller ratio lifters then to say to run a smaller cam with bigger ratio lifters to equall the same amount of valve lift?

 

_________________

Too many cars atm

ED sprint
EF Fairmont V8
AU ghia V8

Top
 Profile  
 
 
Posted: Tue Jan 13, 2009 12:04 am 
Getting Side Ways
Offline
User avatar

Age: 31

Posts: 2116

Joined: 13th Aug 2005

Gallery: 15 images

Ride: 1999 XHII XR8, 2002 AU Fairmont

Power: 236 rwkw

Location: Perth
WA, Australia

nicskitz wrote:
does it make any difference to run a bigger cam with smaller ratio lifters then to say to run a smaller cam with bigger ratio lifters to equall the same amount of valve lift?


I've actually never heard of different ratio lifters, they are all the same size.

 

_________________

STREETBUILT RACING
1999 XHII Falcon XR8 Ute 5.0L, TKO600 5spd, KB 2.1L Blower, 6.5psi, 12.2@113mph!!

Top
 Profile  
 
 
Posted: Tue Jan 13, 2009 9:56 am 
Getting Side Ways
Offline
User avatar

Age: 39

Posts: 1886

Joined: 26th Nov 2006

Gallery: 7 images

Ride: EL XR8, '08 Mondeo XR5t

Power: 205 rwkw

Location: Perth
WA, Australia

nicskitz wrote:
does it make any difference to run a bigger cam with smaller ratio lifters then to say to run a smaller cam with bigger ratio lifters to equall the same amount of valve lift?


I've wondered the same thing, but we'll change lifters for rockers...

 

_________________

Trickflow Street Heat top end kit, 70mm BBK TB & EGR, 24lb injectors, Underdrives & 3.73s: 275rwhp - 13.15@105mph NA / 12.37@116mph N20

When injustice becomes law, resistance becomes duty

Top
 Profile  
 
 
Posted: Wed Jan 14, 2009 12:03 am 
Stock as a Rock
Offline
User avatar

Age: 31

Posts: 150

Joined: 10th Mar 2008

Ride: ED EF and AU V8s

Location: Perth
WA, Australia

woops i messed my words up a little lol

i ment to change between the 1.6:1 or 1.73:1 ratio rockers to equall the same lift using different cam sizes?

 

_________________

Too many cars atm

ED sprint
EF Fairmont V8
AU ghia V8

Top
 Profile  
 
 
Posted: Wed Jan 14, 2009 7:57 pm 
Getting Side Ways
Offline
User avatar

Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

A Crane 2031 with 1:72 rockers and AFR 165 heads work.. But still check..
Roller cams have VERY FAST ramp rates.. Fitting higher rocker ratio will give valve springs a hard time if not upgraded...

 

_________________

As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

Top
 Profile  
 
 
Posted: Fri Jan 16, 2009 12:16 pm 
Tyre Shredder
Offline

Posts: 311

Joined: 3rd Jan 2006

Location: tauranga
New Zealand

the duration of the cam has as much affect if not more than valve lift as its normally in the valve overlap period when theyre most likely to hit

as said above roller cams ramp up rates are quick there are ways to get the best of both worlds .... check out the different cam specs compare overall duration with figures @50 thou ....theres big differences

example comp xe 264 relatively small duration cam compared to crane 2031 which is 276 duration ..... the 264 @50 thou is only 2 deg smaller by having a real quick ramp up

could be an option for you if your concerned about P-V clearance

downside to the real quick ramp up is theyre real hard on valvetrain and can be a bit clattery
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 1  [ 13 posts ] 

Who is online

Users browsing this forum: No registered users and 15 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 Sun Dec 17, 2017 11:27 pm All times are UTC + 11 hours

 

 

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