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Froudey's Head Project (More Progression 2) 

 

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Posted: Tue May 20, 2008 11:21 pm 
Oompa Loompa
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Sorry for my lack of vocabulary.

If you have ever read a headgasket replacement guide, most of them insist to get the head machined so the head is no longer warped (warped meaning not level) when it makes contact with the engine block. Skimming the head is removing more material than is needed to level the head to boost the compression.

I wouldn't know how much it would be worth...if you disassembled the head yourself it'd be pretty cheap. Definately sub $500, Im guessing 250ish. Get yourself a quote from a machinist shop.
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Posted: Tue May 20, 2008 11:26 pm 
Oompa Loompa
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Btw, does anyone know of a die grinder kit to suit polishing a head?

I already have a die grinder and a industrial sized air compressor but I have no idea on how to accuire a kit to suit porting a head without individually buying all the fittings.
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Posted: Tue May 20, 2008 11:53 pm 
Getting Side Ways
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You need a compressor air tool and carbide porting tool....
http://www.carbidebur.com/

 

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Posted: Wed May 21, 2008 12:16 am 
Fordmods Junkie
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Hey Froudey, ask around for a spare head of another car which is cracked or something. If you are ringing around, see if the engine shops have cracked heads that they are just throwing out, see if you can tax that off them and practice on those before attacking the good head.

phong =P~

 

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Posted: Wed May 21, 2008 7:11 pm 
Getting Side Ways
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Froudey wrote:
cjh wrote:
Froudey wrote:
so the springs need to be compressed???


Yeah!!!, how else did you think you were going to get it apart???
You had better get a w/shop manual, eh?


i have a work shop manual for 3.9 series. is much if any differences from the 4L onwards?

i will price a spring compressing tool and purchase one when i have the cash. As i said before slow and steady...

Another queastion...
If this head is any good and i go well what is the go with the whole compression issue.... (ie 3.9 raises a 4L compression and a 4L lowers the decompression) is this an issue at all, eg. lower the power out put or torque or even raise said things


One of the differences may be the size of the HLA's. They are very similar otherwise, just little things here & there.
When you raise the compression ratio, it increases the torque. But in doing this, there can be consecquences, like too higher compression, pinging ( detonation ), engine won't run properly due to the ECU trying to compensate in some way.
You usually raise the comp. ratio because your running a longer duration/higher lift cam.
There other delamers to concider when changing engine specs, like comp. ratio, cam profiles, piston types ( flat tops, lumpy tops, etc ), valve head sizes..etc, etc.....

 

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Posted: Wed May 21, 2008 7:26 pm 
Getting Side Ways
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To Busy at work to do a ring around... but i am thinking i will get the head shaved and just clean all parts and then polish it etc etc and put it back together not going to change any bits from OEM so in theory i shouldn't stuff anything around...

 

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Posted: Thu May 22, 2008 12:06 am 
Smokin em up
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Froudey, I just finished reconditioning a 4L head for my car, I smoothed and polished exhaust and combustion chamber and slightly ported intake, then got head shop to chemical clean, flow test, shave, cut new valve seats, supply and fit new valve stem seals, supply new head bolts and gaskets, cost me $550, I got CMS to supply me new XR6 size exhaust valves and got an AU head gasket from ford, Total has estimated up to $850
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Posted: Thu May 22, 2008 10:24 am 
Getting Side Ways
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HP hungry wrote:
Froudey, I just finished reconditioning a 4L head for my car, I smoothed and polished exhaust and combustion chamber and slightly ported intake, then got head shop to chemical clean, flow test, shave, cut new valve seats, supply and fit new valve stem seals, supply new head bolts and gaskets, cost me $550, I got CMS to supply me new XR6 size exhaust valves and got an AU head gasket from ford, Total has estimated up to $850


great thanks for that got something to go from....

at lunch hopefully will get it into the sun light have a look at it and on the weekend start distmantling it... this is just a hobby / learning experiance to rebuilt it to OEM specs or xr6 spec

 

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Posted: Fri May 23, 2008 2:47 pm 
Getting Side Ways
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I got of my a** finally and took the head out of the boot of my car and put in my garage on the bench and gave a quick once over seems to be no cracks i also gave it a hit with degreaser and bug and tare grease remover product and it is currently sitting and degreasing on tomorrow i start distmantling.

(bunnings is opening up tomorrow so i wil get some tools)

 

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Posted: Sat May 24, 2008 4:41 pm 
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Some Progress Pictures Just taking rockers off and cam off...

 

 

Attachments:
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Posted: Sat May 24, 2008 6:33 pm 
Getting Side Ways
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i paid 80 for a skim and pressure test.

woulda been just 40 if i just wanted it skimmed without any pressure testing

 

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Posted: Sat May 24, 2008 7:49 pm 
Getting Side Ways
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I started to clean it more and it looks like a good head tiny bit of corrosion around the water ports but no more then any other head that had some many kms...

Would it be ok to give them a quick hit to clean the some of the tiny pitting on them....

Any thoughts towards painting it a cat yellow... or another colour

 

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Posted: Tue May 27, 2008 3:02 pm 
Getting Side Ways
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*Update going to purchase a set of spring compressors or find if i can borrow a set from father's best mate.. and then i will take the springs out and the pop round the corner and drop it off so it can be soda blasted (got quoted between 25 and no dearer then 35 dollars) so on tuesday next week i will have a nice clean head...

 

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Posted: Tue May 27, 2008 7:25 pm 
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Looks really clean like its come from an LPG motor.

 

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Posted: Tue May 27, 2008 8:31 pm 
Getting Side Ways
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twason wrote:
Looks really clean like its come from an LPG motor.

nah not from an lpg motored car, as far as i know it come from a car that had done around close to 400kms (Avis EB Falcon) Prior to taking the rockers off i just hit it with the hose and dried the water off.

I priced a set of spring compressor 65 dollars then i thought "well i wil prolly only use it twice max..." although it would be a handy thing to have and ad to my toolbox collection.

 

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