[Healeys] Piston design

[Bob Haskell]

Bob Tullius (Group 44 and a P-51 owner) told us that when Rolls-Royce 
Merlin engines were rebuilt in the field, that the bores weren't 
standardized, so one had to hand select pistons.  Didn't Westinghouse 
make the cylinder heads?

Haynes has published a Spitfire manual.

Bob Spidell wrote:
> re: 
> 
> " Full throttle use was 
>> available for shortly over a 30 second burst and snapped a wire strung 
>> across the throttle quadrant" 
> 
> 
> AKA "War emergency power" * 
> 
> http://en.wikipedia.org/wiki/War_emergency_power 
> 
> 
> * like when an Me-109 was right on your tail. 
> 
> 
> 
> The Merlin was built under license by Packard for P-51s. Packard reduced the original 400+ variations of nuts, bolts and screws to a few dozen standard sizes. 
> 
> 
> 
> bs 
> 
> 
> -------------------------------- 
> Bob Spidell - San Jose, CA 
> 
> 
> 
> Wow! Is that what present day owners have to do? It would make owning a 
> Spitfire or Mustang (same engine) VERY expensive. As if just buying one was 
> not expensive enough! 
> Mike MacLean 
> 60 Sprite 
> 56 BN2 
> 
> On Mon, Jan 25, 2010 at 6:09 AM, Guy R Day <grday at btinternet.com> wrote: 
> 
>> Interesting little snippet from Federal Mogul that they have found that 
>> re-melting cast alloy piston centres (DuraBowl technology) reduces the grain 
>> size of the alloy and silicon particles resulting in a cost effective 
>> stronger and more thermally resistant piston. The immediate future is for 
>> diesel engines but - who knows? 
>> Another snippet for those who care - the Merlin engine (Spitfire) was 
>> removed, serviced and rebuild every 40 hrs under normal service and EVERY 
>> time full throttle was used, no matter how long for. Full throttle use was 
>> available for shortly over a 30 second burst and snapped a wire strung 
>> across the throttle quadrant to show the ground crew it had been used. Water 
>> injection was not used for decokes!! 
>>
>> Guy R Day 
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