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+--- Thread: Chromidium Block. (/showthread.php?tid=9775)
Chromidium Block. - Chris Garner - 24-12-2024
For those who've never seen one. A rare item.
RE: Chromidium Block. - Ivor Hawkins - 24-12-2024
First I’ve ever seen Chris, but then I’ve never had a sports seven!
RE: Chromidium Block. - Martin Baker - 25-12-2024
I've got one of those too from my Speedy engine, only problem iis t has a crack around the back of no. 4 (unlined +.80).
Replaced with Tony Betts new block.
I keep wondering if it's worth having it laser welded. Any suggestions?
Happy Christmas all.
Martin
RE: Chromidium Block. - Peter Butler - 26-12-2024
(25-12-2024, 02:36 PM)Martin Baker Wrote: I've got one of those too from my Speedy engine, only problem is it has a crack around the back of no. 4 (unlined +.80).
Happy Christmas all.
Martin
Martin -
Did you mean "(unlined + 80)" ? If so, does this explain the performance of your Speedy? To what does this increase the c.c.'s?
Happy Christmas!
As ever,
Peter Butler
RE: Chromidium Block. - Reckless Rat - 26-12-2024
surely it's +0.080" and not 0.8.... ???
RE: Chromidium Block. - Robert Leigh - 26-12-2024
I have not bothered with the calculation, but have long understood that +.080" gives 803cc. Inevitably we confuse the units in this situation.
RE: Chromidium Block. - Ruairidh Dunford - 26-12-2024
The new metric slipper pistons are actually +0.004” bigger than the markings on the box.
+80 are actually +0.0084” - for each size.
This is sometimes very useful, particularly at the larger sizes…
RE: Chromidium Block. - dickie65 - 27-12-2024
I have had all the valve seats on my 9E Chromidium block welded up as well as some of the stud holes and other damage.
The block was given to me by a fellow Seven owner as it was un usable.
I took it to EMP in Havant for them to weld up using Lazer Welding which was cheaper than a new block but only just !!
It has saved an original part from scrap or being used as a doorstop.
I also have another 9E block without the Cromidium marking which I suspect was a Factory replacement as it came with an un numbered 9E crankcase.