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

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  #31  
Old 26th November 2014
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Sup every one...i been a long time reader and fan of alot of u guys here on the forum this forum is like a bible to me..i love my ironhead to the point i lose sleep thinking of keeping her running right and restored..and reading this thread i did a compression test on ol'glenda and found shes reading 120-120 is that right?..btw 1980 ironhead sportster electric start
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  #32  
Old 26th November 2014
ratt2y ratt2y is offline
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I am not sure about this but I don,t think you can fill a combustion chamber to 14.7 psi with an intake valve 1/3 the size of the cylinder.you know what I mean LIFT/DRAG air flow.
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  #33  
Old 26th November 2014
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120/120 is fine, its not the actual figure but the difference between them that is important.
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  #34  
Old 26th November 2014
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Quote:
Originally Posted by Kauz789 View Post
... i did a compression test on ol'glenda and found shes reading 120-120 is that right?...
Just checking, did you remember to keep the throttle wide open during the test? and to have the engine at full operating temperature? If either of these was missed your result is less than it would be.

Welcome! to the IronHead forum.
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  #35  
Old 26th November 2014
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Yes i drove around town got fuel and back to my garage about 1/2 hour to 45mins and yes did the test with the throttle open
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  #36  
Old 27th November 2014
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I don't think the guy has done a compression test yet. He says he read it should be 110 psi. How about it Brownskull, done it yet? Borrow/buy a gauge. Warm it up, take both plugs out. Screw the gauge in one side then the other with the throttle open
and report. Lets put this to bed.
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  #37  
Old 3rd January 2015
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thinks ted.Fe Head just how fast can you kick an iron head?do a test of a running motor,you might get 250psi? I do see the math.I mean one lung it at 2000rpm.checking other jug with no fire?
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  #38  
Old 3rd August 2021
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Hallo what is the complet Timing Ratio of the R5 in Degrees?
The one of my BSA is
IN op 45° BTDC Clo 65°ABDC
EX op 65° ABDC Clo 30°ATDC

Comp Rate is 8:1 130psi is what i get with the Lowcomp Sporty Piston
The main problem is a overheatet EX valve.
Some Old man told me i have to set the timing so to get a flush of fresh air over the Ex valve to cool it....

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  #39  
Old 3rd August 2021
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did someone put low compression pistons in it?they were 9:1 from the factory.you'll get the best comp readings with the motor hot,throttle held wide open.
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  #40  
Old 3rd August 2021
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120-120 is what I would expect on a well used engine.

try the test again after squirting a little oil (enough to coat the walls/rings) into the cylinders.
If the pressures some up 10 PSi or so, your just looking at normal wear on an Ironhead of that age.

With a fresh battery an electric leg should be fast enough to get you a correct reading. Kicking is always "Problematical".
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