Negative overlap? Cometic and ARP ?'s - Page 2

linuxman51 · 11-09-2018, 09:59 AM

yeah, if you've milled out a bcp head that much I'm almost surprised it hasn't cracked. overlap doesn't burn exhaust gaskets. poor sealing is the main culprit, and ****ty gaskets is up there as well. the rubberized/metal clad gaskets always worked the best for me on 8v stuff. the paper felpro type gaskets (or dimpled paper/metal) are absolute gutterslut trash.

VB242 · 11-09-2018, 11:20 AM

^ well it's running now, I used the exhaust gaskets in the elring kit from FCP, metal over paper I think? I did buy new turbo manifold washers and copper nuts from Ian. I haven't driven it yet though just warmed it up to set the timing.

VB242 · 11-10-2018, 10:10 AM

I drove it in to work today, I swapped in a B cam, long story short the threads for the cam gear stripped out of the ipd cam. It seems more linear and less laggy but maybe down on power a little bit. Still, blasting out of the tunnel up the hill in 3rd put a big grin on my face :-)

mikep · 11-12-2018, 01:06 PM

Quote:

Originally Posted by VB242

So my guy is saying to use engine paint on the cometic, anyone have experience with this?

tell that caveman to go back to the 1960s.

VB242 · 11-12-2018, 02:25 PM

Quote:

Originally Posted by mikep

tell that caveman to go back to the 1960s.

He said they burnt a piston at the drag strip, pushed the piston out, pushed in a new one, sprayed the cometic with engine paint, slapped it back together and kept making runs.

Stiggy Pop · 11-12-2018, 02:41 PM

Dry and clean. I'm using a cometic on an o-ringed block and it went in dry and clean.

VB242 · 11-12-2018, 04:35 PM

Quote:

Originally Posted by Stiggy Pop

Dry and clean. I'm using a cometic on an o-ringed block and it went in dry and clean.

That's fine the first install, some of the viton went away so I supplemented with Hylomar for the second time around.

dl242gt · 11-12-2018, 06:26 PM

We used to use the copper gasket spray paint on the copper head gaskets for the AH Sprite and to seal the passages we would add weather strip adhesive. That was at the track to fix a blown head gasket. They didn't make Cometic gaskets for sprites or Volvos back then.

Lord_Athlon · 11-13-2018, 08:36 PM

Get a different head.

mikep · 11-13-2018, 09:48 PM

Quote:

Originally Posted by VB242

My head has had 2.6mm milled off plus the 2-3 thou today. It's almost to the point where the bcp cooling passages are getting too close to the fire ring.

I have some good heads if you need one.

VB242 · 11-14-2018, 04:09 AM

Quote:

Originally Posted by mikep

I have some good heads if you need one.

It's running now, not taking it apart again cause of Internet H8. In case you missed this on the wut didja do to ur car tread

11-09-2018, 09:59 AM	#26
linuxman51 BRANDSCHUTZVORSCHRIFTEN! Join Date: Dec 2002 Location: mont, AL	yeah, if you've milled out a bcp head that much I'm almost surprised it hasn't cracked. overlap doesn't burn exhaust gaskets. poor sealing is the main culprit, and ****ty gaskets is up there as well. the rubberized/metal clad gaskets always worked the best for me on 8v stuff. the paper felpro type gaskets (or dimpled paper/metal) are absolute gutterslut trash. __________________ "They bum rushed them in their own crib, they drank all their beer, they partied with their ladies and they left with the trophy" Now with in-house Dyno tuning! Megasquirt Tuning! Plug and play LH 2.4 Megasquirt, now with stealth mode!

11-09-2018, 11:20 AM	#27
VB242 Mojo Stealer Join Date: Sep 2011 Location: Virginia Beach	^ well it's running now, I used the exhaust gaskets in the elring kit from FCP, metal over paper I think? I did buy new turbo manifold washers and copper nuts from Ian. I haven't driven it yet though just warmed it up to set the timing. __________________ 1980 primer JDM flares franken-242DL, 1989 silver 780 sienna rear spring nivomat delete

11-12-2018, 02:41 PM	#31
Stiggy Pop Board Member Join Date: Feb 2011 Location: Granville, MA	Dry and clean. I'm using a cometic on an o-ringed block and it went in dry and clean. __________________ '79 242 943 pickup

11-12-2018, 06:26 PM	#33
dl242gt Can play the blues Join Date: Jun 2002 Location: S NJ, a suburb of Phila.	We used to use the copper gasket spray paint on the copper head gaskets for the AH Sprite and to seal the passages we would add weather strip adhesive. That was at the track to fix a blown head gasket. They didn't make Cometic gaskets for sprites or Volvos back then. Last edited by dl242gt; 11-12-2018 at 06:27 PM.. Reason: add copper

11-13-2018, 08:36 PM	#34
Lord_Athlon Just damn Join Date: May 2003 Location: Real world	Get a different head. __________________ 84 242 turbo msII My build https://forums.tbforums.com/showthread.php?t=8675309

11-10-2018, 10:10 AM	#28
VB242 Mojo Stealer Join Date: Sep 2011 Location: Virginia Beach	I drove it in to work today, I swapped in a B cam, long story short the threads for the cam gear stripped out of the ipd cam. It seems more linear and less laggy but maybe down on power a little bit. Still, blasting out of the tunnel up the hill in 3rd put a big grin on my face :-)

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