02GF74
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| posted on 12/5/06 at 02:19 PM |
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calling crossflow cylinder head experts
I thought all crossflow heads were flat i.e. no combustion chamber in the head, so what is the story with this one?
Is this pre-crossflow? Or for which crossflow engine?
http://cgi.ebay.co.uk/Ford-pre-crossflow-cylinder-head-race-rally_W0QQitemZ8064555490QQcategoryZ72205QQrdZ1QQcmdZViewItem
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Marcus
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| posted on 12/5/06 at 02:24 PM |
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That aint a crossflow!!
Count the ports - 8 on one side.
It's a pre - crossflow 
There were some crossflows (early) that used chambered heads and flat topped pistons - supposed to flow slightly better ISTR
Marcus
Marcus
Because kits are for girls!!
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Doh!Nut
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| posted on 12/5/06 at 02:27 PM |
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The title does say "Pre Crossflow"
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02GF74
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| posted on 12/5/06 at 02:30 PM |
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quote:
Originally posted by Marcus
That aint a crossflow!!
Count the ports - 8 on one side.
It's a pre - crossflow
There were some crossflows (early) that used chambered heads and flat topped pistons - supposed to flow slightly better ISTR
Marcus
ports - doh - didn't see that!!
who can tell me more about the chambered heads then? I take it I won't have one with my 711 (a later castng) of the block?
Just curious, but what effect will fitting one of those have, other than a probably substantial loss in CR?
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muzchap
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| posted on 12/5/06 at 02:37 PM |
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Turbo it
------------------------------------
If you believe you're not crazy, whilst everybody is telling you, you are - then they are definitely wrong!
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NS Dev
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| posted on 12/5/06 at 02:44 PM |
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quote:
Originally posted by Doh!Nut
The title does say "Pre Crossflow"
are you hallucinating?
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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Peteff
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| posted on 12/5/06 at 02:44 PM |
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The chambered heads were on 1100 and 1300 van engines for sure but they didn't have flat top pistons, just lower compression. The chamber on the
one I had was very shallow, not enough to run flat top pistons.
yours, Pete
I went into the RSPCA office the other day. It was so small you could hardly swing a cat in there.
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Marcus
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| posted on 12/5/06 at 02:44 PM |
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Back in the crossflows heydey, there was a lot of discussion about what was best. The Slightly chambered head just got it, but not for the head design
(if that makes sense).
The pistons can be made considerably lighter when flat top, reducing reciprocating mass and hence increasing power.
That said if you use the chambered head and normal pocketed pistons a turbo or supercharged crossflow sounds like a lot of fun
Marcus
Marcus
Because kits are for girls!!
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NS Dev
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| posted on 12/5/06 at 02:46 PM |
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Run flat top pistons but with no chambers!!! Just run em down the bore a touch, then you can get big valves in (which you can't with chambered
heads) and still run light pistons.
you'll have poor fuel consumption and have to run loads of ignition advance due to the lack of squish but it'll make good power!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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UncleFista
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| posted on 12/5/06 at 02:58 PM |
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quote:
Originally posted by NS Dev
quote:
Originally posted by Doh!Nut
The title does say "Pre Crossflow"
are you hallucinating?
The ebay title not this thread title 
Tony Bond / UncleFista
Love is like a snowmobile, speeding across the frozen tundra.
Which suddenly flips, pinning you underneath.
At night the ice-weasels come...
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NS Dev
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| posted on 12/5/06 at 03:09 PM |
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Ahhhh, I see!!
Obviously not Blue Smartie time!!
Retro RWD is the way forward...........automotive fabrication, car restoration, sheetmetal work, engine conversion
retro car restoration and tuning
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britishtrident
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| posted on 12/5/06 at 03:24 PM |
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Very early xflos had chambered heads -- not reall much just a small depression. It was soon dropped however the Mk1 Mexico was homologated with a
chambered head for "compresion correction".
As for the use on vans to lower the compressiion I can't comment although we maintained a fair size fleet for a national company they were so
reliable we never had the head off one.
In the late 70s chambered Xflos were produced by some tuners to try and reduce pistom weight in full house engines.
A good trick in the days of leaded 5 star was to fit 1100 pistons to 1300 engines for obvious reasons.
[Edited on 12/5/06 by britishtrident]
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