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

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

The title does say "Pre Crossflow"

quote:

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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

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Turbo it

quote:

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Originally posted by Doh!Nut
The title does say "Pre Crossflow"

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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.

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

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!

quote:

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Originally posted by NS Dev

quote:

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Originally posted by Doh!Nut
The title does say "Pre Crossflow"

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are you hallucinating?

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Ahhhh, I see!!

Obviously not Blue Smartie time!!

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]