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 on: Today at 11:38:01 AM 
Started by wobblywalrus - Last post by wobblywalrus
This calculation is for a round edged circular orifice.  The current filter opening is 2.825 inches in diameter with a 6.27 square inch area.  The restrictor orifice will have a 1.437 inch diameter with a 1.621 square inch area.  This is a big decrease and it should help to reduce the intake plenum volume to the needed size.

 on: Today at 06:26:12 AM 
Started by Milwaukee Midget - Last post by fordboy628

Way to go Tom Donney!!

Hoping to see at least 3 cars in I/GT @ SpeedWeek 2019.


 on: Today at 12:14:17 AM 
Started by wobblywalrus - Last post by wobblywalrus
Pages 136 - 138 of this build diary are about Pendine.

Some expert advice in a PM, a phone call a few weeks ago, plus some references suggest the starting point for plenum sizing is 1 to 1.5 times the cylinder displacement at half stroke + port volume + external plenum volume, or the cylinder displacement, or 1.2 times the cylinder displacement.  The plenum volume must exclude the air filter volume if any of these criteria will be met.

There is a filter and a resonance chamber in the air box that Triumph made for this bike.  They are separated by a plate having a round edged slot in it.  This concept will be used on these plenums to isolate the filter.  Does anyone have flow data for different sizes of these orifi in cfm at at 28 inches of water?  The plan is to use the smallest one that will provide decent air flow.

 on: January 15, 2019, 06:25:06 PM 
Started by Milwaukee Midget - Last post by nickleone


 on: January 15, 2019, 02:14:16 PM 
Started by Seldom Seen Slim - Last post by edinlr
Just sent my annual donation and want to encourage everyone who can, to go to the home page go to the donate box at the bottom left.  What a priceless resource this site has been for me.

 on: January 15, 2019, 12:18:26 PM 
Started by wobblywalrus - Last post by Lemming Motors
Pendine Sands (historic LSR venue) is still used by some groups for speed runs; notably The Straightliners who are primarily motorcyclists but they are very tolerant of other wheeled craft at their events, maybe not Hercules though. shocked

 on: January 15, 2019, 11:03:43 AM 
Started by wobblywalrus - Last post by wobblywalrus

This shows how the beaches in the UK are wide and fat and can be raced upon.

 on: January 15, 2019, 10:45:07 AM 
Started by wobblywalrus - Last post by wobblywalrus
Thanks, Harold.  Any advice is appreciated.  This Helmholz tuning pretty mental for the ol' walrus.  The traditional british parallel twin has pistons that move up and down their bores at the same time and the firing occurs at opposite cycles.  The wave action and pressure and vacuum in a cylinder can be used to enhance the intake performance of its mate.  This engine has a staggered firing order caused by the rod journals being 90 degrees offset.  The wave actions in the intake are nor synchronous and this is why the plenums are being kept separate and it will be tuned like two 500 cc singles.  This was something explained to me years ago by a Harley tuner when I asked him why he always used two Mikuni carbs on separate manifolds for his race motors.  He said "with a staggered firing order one cylinder is at the last tit on the hog" or something like that.


 on: January 15, 2019, 05:56:08 AM 
Started by Seldom Seen Slim - Last post by fordboy628
Podunk's efforts for the Milwaukee Midget Project have been without equal.

The project, and the former record, simply would not have been possible without his expertise and output.

Thank you Terry.

 cheers  cheers  cheers

 on: January 15, 2019, 05:05:39 AM 
Started by mtiberio - Last post by Malcolm UK
Fast FACTS (the quarterly newsletter of the Speed Record Club) has welcomed many articles from Pork Pie illustrated from his views from behind the camera lens. The Editor has developed a method of ensuring that everyone can enjoy the articles by translating the German/American/English of the author into a fully understandable language for racers. Printed copies of this centuries back issues are available (the first 50 issues are on five CDs) -

Should you want to know about making speed runs in a range of cars (including the UK record holding jet car) then Fast FACTS will have many of the answers. Last month it was Ian Northeast with his Jensen on the Bonneville salt.

Issue 112 is in preparation as I write these words. The current Editor has created forty issues. Her name - Jane Pittwood.   

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