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Re: Re: Re: Re: Re: Adding water to fuel
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Posted by Bill Jones on August 01, 2002 at 13:58:31 from (67.241.53.152):
In Reply to: Re: Re: Re: Re: Adding water to fuel posted by Brandon on July 31, 2002 at 20:52:29:
Brandon
The Merlins don't like turbo's! The thrust from the exhaust stacks and the pulsing of the top end gearing and so on don't mix with turbosupercharging very well.Boat racers have tried to configure turbos on merlin powered boats-but they never worked well enough.
However the Merlins used in unlimited airplane racing have developed up to and over 4 times their original potential-that's over 4,000 horsepower!! But to get it they use ADI ( 50% water,25% Ethyl alcohol,and 25% Methyl alcohol), NOS (nitrous oxide),more lead in the fuel and other "secrets".
The Merlins used in WWII used a Two Stage-Two Speed mechanically driven(geared) supercharger. This was aftercooled to prevent pre-ignition in the cylinders.So ,actually the Spitfire had an auxilliary super feeding the supercharger,that could be set at "low blower" for 6,000 ft. and below or at "high blower" for gulping thinner air at higher altitudes.
The Allison V-1710's were designed to be used with a turbosupercharger AND a geared two-stage supercharger from the beginning.In fact,the auxilliary supercharger(1st stage) consumed 490 hp. from the crankshaft at the 2250 hp. WER (war ememergency rating) rating! In the P-38,it was used with the GE turbos, and it was a success. In the P-51 and P-40,it wasn't, so they didn't perform as well.The Mustang of course got the Merlin and performance at altitude was improved greatly! The design of the Merlin supercharger system was what set it apart from the Allison.
Interesting sidenote- these engines were both originally designed for use with 87 octane fuel!
I think a chech would be fine to get that engine 8^) Good Luck! BillJ
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