[HEADWORK] Port Match and Polishing

[jdbubb@ix.netcom.com (Dan Bubb)]

Taking .04" off a JH head on an ABA block (assuming the ABA is 10:1 stock)
will get you 10.8 CR.
Taking .04" off a JH head on a JH block (assuming it is 8.5:1 stock) will
get you 9.1 CR.
Just thought I'd harden up some numbers.
Dan

----- Original Message -----
From: ATS - Patrick Bureau <pbureau@attbi.com>
To: Dave Ewing <rabbit16v@prodigy.net>; Scirocco List
<scirocco-l@scirocco.org>
Sent: Sunday, April 14, 2002 8:18 AM
Subject: RE: [HEADWORK] Port Match and Polishing


> Very Sweet... What did you use to do the P&P on the head, I am about to do
> this on my 8v JH Head, and I have been looking for information on what
> materials to use to do this (BY Hand or mechanical means?)  0.40" shaves
> eh..? thats a lot indeed... I have thinking of sending mine out to be
shaved
> 0.20" (to push the compression from 10:1 to 10.5/11:1 maybe, what kind of
> compression you have now with a 0.40" shave doen to the head, I am very
> curious of the results on that !
>
> ==========================================
> ATS - Patrick Bureau
> 1985 8v "ATS GTX" <- About to embark in ABA/JH project
> 1988 16v "ATS 16V" <- For Sale : 1500.00
> Web Site : http://longcoeur.com/scirocco
>
>
> =>-----Original Message-----
> =>From: scirocco-l-admin@scirocco.org
> =>[mailto:scirocco-l-admin@scirocco.org]On Behalf Of Dave Ewing
> =>Sent: Sunday, April 14, 2002 4:36 AM
> =>To: Scirocco List
> =>Subject: Re: [HEADWORK] Port Match and Polishing
> =>
> =>
> =>I installed a head that I port and polished myself last week.  I
> =>didn't take
> =>a bunch off but smoothed things out mostly.   Runs very strong and
quiet.
> =>The following is what I did:
> =>
> =>1.  Shaved head 40 thousandths  (the MAX for shaving a 16v head without
> =>having to move the tensioner stud--I can flip the tensioner all the way
> =>over!!!)
> =>
> =>2.  New intake valves, exhaust valves, and valve guides.
> =>
> =>3.  Exhaust cam on intake side which creates an asymetrical cam set and
a
> =>nice lumpy idle but not radical.  Have heard that this is similar
> =>to a 268?
> =>I might, and probably am, wrong but I measured the lobes and the exhaust
> =>lobes were much bigger over all and longer duration.
> =>
> =>4.  2.0L cam gears for quieter chain operation.
> =>
> =>5.  Adjustable cam sprocket--almost a necessity for shaving the head so
> =>much.
> =>
> =>6.  Autotech HD springs.
> =>
> =>7.  Ground vave seats.
> =>
> =>8.  Deshrouded valves.
> =>
> =>9.  Slight combustion chamber polish.
> =>
> =>10.  Minor port and polish.
> =>
> =>11.  2.0L 16v head.
> =>
> =>12.  STOCK TIMING BELT ADJUSTER STUD!!  I installed the head with the
> =>adjuster on the stud so I didn't have to pull the stud to install the
> =>tensioner.  From now on, I will jack up the motor to replace this
> =>so I don't
> =>wear out the threads in the head.  Heck, it's only time and I have more
of
> =>it than money!!
> =>
> =>I like this setup and feel it flows nicer and smoother than the
> =>P/P 1.8 head
> =>with euro cam.  I still need to play with the timing a little since I
> =>adjusted it advanced because of the increased compression and cam
> =>setup and
> =>still don't get even one ping so I think I might need to play with the
> =>adjustable cam sprocket a little.
> =>
> =>Check out pictures of the head not installed here:
> =>
> =>http://pages.prodigy.net/dcewing/_uimages/2.016v1.JPG
> =>http://pages.prodigy.net/dcewing/_uimages/2.016v2.JPG
> =>http://pages.prodigy.net/dcewing/_uimages/2.016v3.JPG
> =>http://pages.prodigy.net/dcewing/_uimages/2.016v4.JPG
> =>
> =>These weren't the final product but it was nice to be able to
> =>take pics then
> =>shape and smooth more accurately after looking at the pics.
> =>
> =>Dave
> =>
> =>
> =>
> =>
> =>_______________________________________________
> =>Scirocco-l mailing list
> =>Scirocco-l@scirocco.org
> =>http://neubayern.net/mailman/listinfo/scirocco-l
> =>
>
>
> _______________________________________________
> Scirocco-l mailing list
> Scirocco-l@scirocco.org
> http://neubayern.net/mailman/listinfo/scirocco-l