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+--- Thread: Cylinder block sliced up (/showthread.php?tid=470)
Cylinder block sliced up - Geoff Halstead - 19-11-2017
Have made a start on slicing the early block, but the 24tpi blade In the bandsaw is too fine so after breaking one, after putting too much pressure on it, am now waiting for a much coarser 10/14 to use.
This is how far I've progressed, and quite an eye opener it is:
Geoff - Photos of slices to follow plus video using the new blade when it arrives.
RE: Cylinder block sliced up - Austin in the Shed - 19-11-2017
How do we reduce a photo size ,please.
RE: Cylinder block sliced up - Austin in the Shed - 19-11-2017
Common problem I think.
RE: Cylinder block sliced up - Nick Lettington - 20-11-2017
Wow... That certainly helps understand how they end up porous!
Nice through-studs too btw.
RE: Cylinder block sliced up - Ken Morton - 21-11-2017
Nice photo of the mag crankcase. Where did you get the mod for oil inlet pipe? Are they available?
RE: Cylinder block sliced up - Geoff Halstead - 25-11-2017
Been using an M42 10/14 Vari-Tooth blade from TuffSaws that is proving it's £16.00 cost over the standard 24tpi carbon steel type supplied with the bandsaw.
This supplier is often mentioned and praised, by those on the Model Engineer UK Forum
Just started on a late block, received from Jamie, and going be interesting to see the differences, but the first is the water gap between the cylinders, plus the valve guides are just about flush with the ports, unlike the early engine where they protrude into the ports quite significantly and no water gap between cylinders.
Geoff - A bit nippy in the Carport so play postponed for the day.
RE: Cylinder block sliced up - Tony Betts - 25-11-2017
[attachment=1430]Just found some of the cut up block parts from the NEW blocks I had made.
Might be helpful to show differences in water flow in new over old parts.
[attachment=1431]
[attachment=1432]
[attachment=1433]
[attachment=1434]
The last two pictures show the importance of proofing an item.
We had to do 18 changes to the pattern, and the casting pattern and box had to be totally remade 3 times to make the casting work.
However the difference in new and old blocks was clear, mainly due to there being no corrosion in the water jacket.
The first race car that had our new block fitted, on its first run out. Stopped the radiator from loosing half its water over 3 laps. And knocked 1 1/2 seconds of the cars best ever lap time. Even though the car had an electrical problem, and revs were limited to 6000rpm.
The improvement to the car from the new block, was down to the engine running cooler. So the bores were not bulging from poor water circulation, and bad heat transfer. It was run with same piston type, wich is our slipper Pistons. These Pistons run at a lower friction rate.
Hope all this helps and makes sence. Tony.
RE: Cylinder block sliced up - Ruairidh Dunford - 25-11-2017
Highly impressive Tony - b***s of steel to take on a project like that!
RE: Cylinder block sliced up - Tony Betts - 25-11-2017
Hi R,
I know it won't matter to many.
But when I first made the blocks, the out lay was enough to almost put me out of business.
Stock on the shelf was running down wilst I payed for everything. Including the first 30 to be made. And as the proofing took so long before I could take any money in. I was under a lot of pressure.
Trust me when I say, this was the time in my life I turned grey. And started to go bald.
ALOT OF STRESS.
Tony.
RE: Cylinder block sliced up - Ruairidh Dunford - 25-11-2017
I can only imagine Tony - as I said, impressive!