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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #141  
Old 24th September 2020
XL Dane XL Dane is offline
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I rode together with a friend of mine, and we compared speedo readings. His old BMW 800 GS read 160 km/h when my GPS adjusted speedo read 140 km/h.

Just sayin’
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  #142  
Old 25th September 2020
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Quote:
Originally Posted by rcpfxrt View Post
Back in '65 my fire-breathing 1958 XLCH (1 of 4 sold in IL) Sportster turned the 1/4 mi at 12.36 coming thru the traps at around 105. It was 12.5:1 comp, Sifton 5-cycle cams, Jerry Branch heads, bored DL Linkert with 9x butterfly, extended straights, According to my speedo with a 21 countershaft sprocket it would top in the mid 130's, but I couldn't look at it enough with everything dancing around and my face flapping like a flag. Disbelieve or not - I don't really care, but that's what happened then.

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"HOME OF THE WORLDS FASTEST SPORTSTERS"...

I called them once and asked "HOW FAST"....

Mr. Riley replied...."As fast as your wallet is large.....tell me how fast you want to go and I'll tell you how much it will cost"
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  #143  
Old 25th September 2020
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50 year old speedo's are not accurate indicators. (if they ever were)

They are just an approximation at legal speeds, the faster you go the greater the error.

You can use the mile markers to check your Odometer and a stop watch to check the speed. 60 seconds for a mile is 60 MPH.....
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  #144  
Old 25th September 2020
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Put it in nuetral.



When the wheel bearings start smoking. You will quit wondering.

Edit: I think back in my USMC days. Gravity out of chopper will accell you to 175 MPH.
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  #145  
Old 26th September 2020
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Is it not still 322,870 MPH ?

We would probably have to specify where and what before we could really determine top speed.

Because that figure, 322.870 MPH, was done at Bonneville that bike could potentially be a lot faster at sea level (or below).

And it was done with two engines, not one.

So are we talking about full on race engines or a stock engine. (I kinda assumed stock).

But if so, which one. Some years were faster than others. Who is riding the bike and where and under what conditions ?

In "The Old Days" we were impressed by anything that could "Do the Ton".

A 1976 Sportster will do that but a 1976 Triumph would not.
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  #146  
Old 26th September 2020
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That 322 mph was two shovelhead engines ridden by a Sportster rider Dave Campos! IF they would have had more time and more tires, and more nitro they could have gone faster! Still a record 29 years later!
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  #147  
Old 27th September 2020
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I thought the Shovel engines were used as "ballast" to stabilize the Stream-liner and it was powered by Sportster engines ?
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  #148  
Old 27th September 2020
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10.22 @ 142 at Famoso last years last street scene.was hopin to get in the 9.0s
over 150s this year with some changes I've done since my last wreck but then the phoney flu hit...……………..
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  #149  
Old 27th September 2020
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The 322 record is no longer the fastest record because turbocharged bikes have gone faster! But it is still the fastest normally aspirated motorcycle!
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