Fordmods Logo

xh i6 sohc 10:1 comp 

 

Page 1 of 2 [ 20 posts ] Go to page 1, 2  Next

 
 Post subject: xh i6 sohc 10:1 comp
Posted: Sat Dec 04, 2010 11:59 am 
Fordmods Newbie
Offline

Age: 27

Posts: 3

Joined: 4th Dec 2010

Ride: xhxr6

Location: yarra valley
VIC, Australia

Just wondering how far u need to go to achieve around 10:1 comp, can you just shave the head or do you need to run flat top pistons?
Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Sat Dec 04, 2010 12:11 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 2515

Joined: 27th Mar 2006

Gallery: 1 images

Ride: FG MkII Xr6t Ute

Location: Brisbane
QLD, Australia

I have a feeling if you run an AU head gasket and give the head a shave it will come pretty close.

Just be careful in shaving the head as it isn't an ideal way to increase comp (timing chain issues, no room for if you need to give it a skim after head gasket etc).

 

_________________

EVL098 wrote:
Cramping in the hand from having it on your Wang for an excessive period of time is a definate con.
Seriously do people google "f**k up modifications for Fords owned by Jews" and get linked straight to this site nowadays?

AU,factory fitted tickford kit/IRS, t5,Sports ryder/KYB: gone.

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Sat Dec 04, 2010 4:16 pm 
Getting Side Ways
Offline
User avatar

Age: 49

Posts: 6467

Joined: 18th Dec 2006

Ride: 93 ED sedan

Power: 161 rwkw

Location: Rockhampton
QLD, Australia

Pistons are the best way to get compression.......decking heads = problems....decking block = problems.

 

_________________

http://youtu.be/jJTh9F3Vgg0

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Sat Dec 04, 2010 10:08 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

it's doable with shaving the head and an AU gasket, but you will have chain rattle issues that will turn into broken chain guides.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Sun Dec 05, 2010 10:42 pm 
Oompa Loompa
Offline

Posts: 29

Joined: 10th Dec 2009

Ride: 98 XH Falcon Ute

Location: Cairns
QLD, Australia

mine is going to be at around 9.8:1 with the shaved head

 

_________________

XHII Falcon Ute, power 129.1rwkw 303.6Nm
mods: 2.5inch catback dumped at the diff.

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Sun Dec 05, 2010 10:44 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 4326

Joined: 30th Oct 2006

Gallery: 18 images

Ride: Envi EF

Location: Grafton
NSW, Australia

tickford_6 wrote:
it's doable with shaving the head and an AU gasket, but you will have chain rattle issues that will turn into broken chain guides.


Not really... you only need 20 or 30 thou off the head, with an AU gasket IIRC.

 

_________________

>>>EF Futura T build<<<

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 9:23 am 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

krisisdog wrote:
tickford_6 wrote:
it's doable with shaving the head and an AU gasket, but you will have chain rattle issues that will turn into broken chain guides.


Not really... you only need 20 or 30 thou off the head, with an AU gasket IIRC.



The AU gasket is only 18thou so it's about 25thou thinner then a pre AU gasket.
that's the same as taking 45 to 55thou off the head and using a EL gasket. that's alot and is more then enough to cause problems. When you start adding non standard cams into the mix it gets worse.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 12:57 pm 
Getting Side Ways
Offline
User avatar

Age: 54

Posts: 844

Joined: 12th Aug 2007

Gallery: 22 images

Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

tickford_6 wrote:
The AU gasket is only 18thou so it's about 25thou thinner then a pre AU gasket.
that's the same as taking 45 to 55thou off the head and using a EL gasket. that's alot and is more then enough to cause problems. When you start adding non standard cams into the mix it gets worse.


Has anyone measured the stock piston to valve clearance? I replaced my head gasket with an AU gasket & had 20 thou taken off the head. I'm also using ACL Race pistons. Now I'm wondering if the 'HLA noise' I'm can't fix is actually the valves hitting the pistons. :shock:

 

_________________

AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 1:54 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

Shortshift wrote:
tickford_6 wrote:
The AU gasket is only 18thou so it's about 25thou thinner then a pre AU gasket.
that's the same as taking 45 to 55thou off the head and using a EL gasket. that's alot and is more then enough to cause problems. When you start adding non standard cams into the mix it gets worse.


Has anyone measured the stock piston to valve clearance? I replaced my head gasket with an AU gasket & had 20 thou taken off the head. I'm also using ACL Race pistons. Now I'm wondering if the 'HLA noise' I'm can't fix is actually the valves hitting the pistons. :shock:



would have broken the valves by now.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 3:11 pm 
Getting Side Ways
Offline
User avatar

Age: 28

Posts: 4326

Joined: 30th Oct 2006

Gallery: 18 images

Ride: Envi EF

Location: Grafton
NSW, Australia

Yeh you would have known if it was valves hitting pistons by now! lol
I know the total is about 50 thou tickford_6, theres plenty done that way and are fine, including mine.

 

_________________

>>>EF Futura T build<<<

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 6:01 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

krisisdog wrote:
I know the total is about 50 thou tickford_6, theres plenty done that way and are fine, including mine.



Like i said, it's doable, but not ideal and there are plenty done that way that do have problems.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Wed Dec 08, 2010 9:17 pm 
Getting Side Ways
Offline
User avatar

Age: 54

Posts: 844

Joined: 12th Aug 2007

Gallery: 22 images

Ride: AU2 XR8 ute & 91 EA bitsa

Location: Melbourne
VIC, Australia

Thanks for the info chaps :D

 

_________________

AU2 XR8 with Raptor VL, ported Yella Terra GT40P heads, Scorpion 1.6 RRs, XE264HR-14 Comp Cam, ceramic coated Hurricane Headers, 60lb injectors, Walbro 255, 200cfi cats, 3" exhaust & Snow Performance water methanol injection

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Thu Dec 09, 2010 3:24 pm 
Getting Side Ways
Offline

Age: 36

Posts: 9453

Joined: 9th Nov 2004

Gallery: 4 images

Ride: Fordrunner 5.0 Turbo

Location: Wollongong
NSW, Australia

This might sound ridiculously bodgy but I'm just throwing it out there.


What about pad welding certain parts of your combustion chambers and working them back down to something more realistic with a dremel?
Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Thu Dec 09, 2010 4:06 pm 
Getting Side Ways
Offline

Posts: 6449

Joined: 11th Nov 2004

xcabbi wrote:
This might sound ridiculously bodgy but I'm just throwing it out there.


What about pad welding certain parts of your combustion chambers and working them back down to something more realistic with a dremel?



It's not bodgy, and is very common pratice on a number of engines that don't have aftermarket heads available.

 

_________________

PERMANENTLY BANNED

Top
 Profile  
 
 
 Post subject: Re: xh i6 sohc 10:1 comp
Posted: Thu Dec 09, 2010 5:51 pm 
Getting Side Ways
Offline

Age: 36

Posts: 9453

Joined: 9th Nov 2004

Gallery: 4 images

Ride: Fordrunner 5.0 Turbo

Location: Wollongong
NSW, Australia

True but with all of the man hours required to do this properly would it be more cost effective to use a set of custom dome top pistons? Or is the cost similar but the repeatability of hand grafting heads too difficult to achieve in order to warrant its use for the mainstream?
Top
 Profile  
 
Display posts from previous:
Sort by  
 Page 1 of 2  [ 20 posts ]  Go to page 1, 2  Next

Who is online

Users browsing this forum: No registered users and 33 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 12, 2017 9:36 pm All times are UTC + 11 hours

 

 

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