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stock TR-7 cylinder head thickness
Posted: 06 Dec 2014 13:43
by Tirebiter
Any here know the thickness of a new/unshaved/uncut/unwarped cylinder head ?
Posted: 08 Dec 2014 05:28
by john 215
Hi,
[:D] WELCOME TO THE BEST TR7 / 8 FORUM IN THE WORLD EVER [8D]
To be honest never read anywhere that dimension for a TR7 head, V8 yes, but not a four pot.
Neil has a new one for sale, if you ask nicely he may measure a set point for you ???
http://www.forum.triumphtr7.com/topic.a ... C_ID=21818
There are 20 thou thicker head gaskets available if you need one.
Cheers John
LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC BEAUTY FITTED WITH OVERDRIVE GEARBOX
1979 3.5 FHC CURRENTLY GARDEN ART !
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!
Posted: 08 Dec 2014 19:27
by Tirebiter
Thanks John I sent Neil a message asking ...
Posted: 08 Dec 2014 19:53
by john 215
Hi,
Be interesting to know the figure and where measured from.
Cheers John
LIVE LIFE A QUARTER OF A MILE AT A TIME!
1976 Speke FHC BEAUTY FITTED WITH OVERDRIVE GEARBOX
1979 3.5 FHC CURRENTLY GARDEN ART !
1982 2.0 DHC NOW A 4.6, BUILT NOT BROUGHT !!!!
Posted: 08 Dec 2014 23:20
by nick
Hello Tirebiter, welcome. This topic has been discussed on this forum. I bet if you use the search function and read through some old posts you will find it. I do remember that you measure from the half moon cutouts to the top of the head but the number escapes me.
Oops. Just found it.
http://www.forum.triumphtr7.com/topic.a ... +thickness
[img][IMG]http://i615.photobucket.com/albums/tt234/nickmi/TR7%201975/Yellow.jpg[/img]
nick
'79 TR7 DHC
'76 TR7 FHC
Posted: 12 Dec 2014 17:29
by Tirebiter
Hi Nick, Thanks for taking the time to do the search. I looked at the link but did not find a number. I have found what people say is the minumum thickness as measured from the half-moon
(actually it's the cam journal diameter but in the front or rear of the head. No other way to align-bore the cam journals during manufacture)
to the bottom of the head (4.427 inches or 112.45mm) but the same people do not also specify what is the maximum amount that can be safely milled from the head.
I have read a couple of different specifications for how much is too much to remove. Thus my enquiries.
Posted: 12 Dec 2014 18:37
by Stag76
The minimum thickness is to do with valve timing. If you want to mill more from the head to increase compression, you will have to re-drill the cam wheel to avoid retarding the valve timing too much. Depending on which pistons you are using, you may have to increase the valve cut-outs.
TR7 Convertible
Sprint Motor
MegaSquirt EFI
Posted: 12 Dec 2014 23:24
by nick
Did you push the correct link? 6th post down from our learned friend from Australia, Stag76
[img][IMG]http://i615.photobucket.com/albums/tt234/nickmi/TR7%201975/Yellow.jpg[/img]
nick
'79 TR7 DHC
'76 TR7 FHC
Posted: 14 Dec 2014 13:36
by Tirebiter
Nick, Yes, I saw where the minimum head thickness was listed. I'm trying to find a specification for what a new head thickness is.
TR-7 and TR-8 are two different cars. I like them both.