According to Geoffrey Healey, the 100 Six engine with new 12 port head
had too much port opening so there isn't the needed gas velocity at
lower revs.
All the smoothing and streamlining and such probably doesn't hurt at
higher revs. I had all the porting and valve work done for mine, then
am switching to a 3000 block.
On Feb 19, 2011, at 11:37 PM, Austin Healey wrote:
> Hi Wilko,
>
> Thanks for Your idea.
> I dont intend to gring the port overly, just to "streamline" it by
> removing edges, roughnesses etc. I plan a special valveseat-cut,
> that I have used on Minis with success, accompanied with some valve
> shape modificaions.
> Does valve deshrouding do any good?
>
> Gergo
>
> 2011/2/19 Eric (Rick) Wilkins <e-wilkins at cox.net>
> WIth the 2.6 porting is not going to help, and may actually hurt
> performance. The ports are plenty big and are cited as one of the
> main reasons that 100 Sixes are more likely to cough and sputter.
>
> Wilko
>
>
> On Feb 19, 2011, at 10:42 AM, Austin Healey wrote:
>
> Hi,
>
> Just in case if You have some time...
>
> I am preparing to rebuild my engine (big breath, fingers crossed, St
> Christopher "activated" etc). I did some other engine rebuilds
> recently, soo
> have the basic equipment and common knowledge, but nothing Healey-
> specific.
> Can You give me some instructions on what to take extra care? Are
> there any
> recommended modifications?
>
> My plans are:
> - "fastroad" 2.6 engine, with 12 port head slightly ported/polished.
> - reprofiled cam (approx 260 in and 265ex degrees)
> - 10:1 CR
> - rear oil seal conversion
> - "bucket" oil seals on valve guides
> - slightly lightened/balanced crankshaft and flywheel
>
> Soo far.
>
> Any additions?
> Gergo
>
> PS: I have read some hints in the archieve, but I have got 1000s of
> letters
> :-o
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