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+--- Thread: Which head (/showthread.php?tid=1707)
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Which head - Tiger - 12-09-2018
Hello
Just about to part strip my 1936 Ruby ARR
ENGINE Has the brass set pin above the web so expecting 3 bearing crank ?
It has the LC head is this correct for that engine.
Or was it possible to have either head originally?
Is their much advantage to the HC head ?
Thanks in anticipation
Regards
Tim
RE: Which head - Ruairidh Dunford - 12-09-2018
If your engine is three bearing then I think it would have originally come with a high compression head - these do work well.
However, if a previous owner suffered plug oiling or main bearing thump, they 'may' have fitted the low compression head to suppress the effects of these problems.
P.s. the 'brass' pin you mention is normally steel, in my experience, and locates in the centre camshaft bush to stop it rotating/moving.
RE: Which head - Tiger - 12-09-2018
Many thanks Ruairidh.
Just about to remove the sump and have a look at the bottom end.
My vehicles history is unknown.
Also appears to have been very badly treated.
So lots of wrongs to right
Hey Ho that’s life.
Agatha (my A7) Now in a happy place
Tim
RE: Which head - Chris KC - 12-09-2018
I only once drove with a LC head, which someone kindly lent me to get to an event while my own head was under repair. I was glad to hand it back though - I was accustomed to getting 60 or 70mph out of my Nippy and she suddenly wouldn't go over 40...
RE: Which head - Reckless Rat - 12-09-2018
The easy way to tell if you've got the High Compression or Low Compression head is to look at the water outlet to the top hose. On the low comp head it is longditudinal and held in place by one single central stud. The later, high comp head is located transversely with a two stud fixing. The spark plugs on the LC head are 18mm and the later head 14mm.
High Compression head here:
![[Image: 040_LI.jpg]](https://s6.postimg.cc/f6ftwmjkh/040_LI.jpg)
RE: Which head - garryruck - 06-02-2019
Just came across this high compression head and wondered what spark plugs are best,
RE: Which head - Bob Kneale - 06-02-2019
I always use Champion L86C plugs on my High Compression head in the Ruby 3 bearing engine On my 2 Bearing engine with a similar head, I've used the same, but the engine feels harsh, and I'll be going back to the Low Compression arrangement with Champion 18mm H6 plugs which feels better even though the power output is a little lower.
Cheers
Bob
RE: Which head - Derek Sheldon - 06-02-2019
Reckless, almost correct but I think that there are a few HCvheads out there with LC water off takes
RE: Which head - garryruck - 06-02-2019
Bob
Have you got a supplier for the H6 Champion plugs?
RE: Which head - Zetomagneto - 06-02-2019
(06-02-2019, 10:36 PM)Derek Sheldon Wrote: Reckless, almost correct but I think that there are a few HCvheads out there with LC water off takes
I’ve never seen one!