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

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  #1  
Old 19th October 2010
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Default Ironhead sportster piston mods (what have you done to better performance)

Here are my machined pistons for the 1000 cc xlcr.

56 g = 1.97534 oz lighter than forged wiseco pistons

24.16 g = 0.852218 oz lighter than stock sportster pistons











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Old 19th October 2010
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Get them coated and put on Total Seal Gapless rings and you will be a happy man.
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Old 19th October 2010
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Default Ironhead sportster piston mods (what have you done to better performance)

They will get coated next.

Still got a trick up my sleeve. Iīm machining new wrist pins right now.

I canīt find the the top gapless rings on the total seal web site. Anybody got a part number??

Buy the way the pistons are cnc machined .020 oversized wiseco pistons.
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Old 19th October 2010
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I'd spend some time hand finishing them. Round off those ridges on the tops of the domes, especially on the corners. Those sharp angles will create hot spots that can lead to pre ignition, then coat them. Have you measured the new domes? How much compression are you gonna lose? A light weight piston won't give you a performance advantage, but they will be a little easier on the rods at high rpm, but the lower compression will give you a performance difference.To really gain a longevity advantage you would need to go with a big bore and shorter stroke to get the piston speed down. That's what they did with the Evo's. Just wondering what you are trying to accomplish by lightening the pistons?
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Old 19th October 2010
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Default Ironhead sportster piston mods (what have you done to better performance)

Should give me better acceleration quicker throttle response (less rotating mass). Also hoping to get less stress on the rod and main bearings. Better oiling on the wrist pinīs and wrist pin bushings (2 extra oil holes).
Better top ring sealing (vertical gas ports).

The comp ratio is 9.5:1

Should work great with the cams i got.
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  #6  
Old 20th October 2010
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I canīt find the the top gapless rings on the total seal web site. Anybody got a part number??
I feel like I'm stating the obvious, but have you tried searching by the bore size?

http://www.totalseal.com/SearchByBore.aspx
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Old 20th October 2010
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Try calling Total Seal I'm sure they will help you out.

Just a question, why do you want the top ring gapless? I am running the second ring gapless in my 93" stroker with 10.5 pistons and it works just fine. I also put gapless in my stock 900cc '68 XLCH and the bike runs great.
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Old 20th October 2010
GA_Ironhead GA_Ironhead is offline
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FDNY, both rings or one only on the '68? Kick start only I assume?
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Old 20th October 2010
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Quote:
Originally Posted by GA_Ironhead View Post
FDNY, both rings or one only on the '68? Kick start only I assume?
Only one ring is the gapless ring and it is usually the second ring. That is the setup I'm running on both my Sportsters and I highly recommend the Total Seal gapless rings.

http://www.totalseal.com/TechPage.as...plessPistRings
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Old 20th October 2010
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Only one ring is the gapless ring and it is usually the second ring. That is the setup I'm running on both my Sportsters and I highly recommend the Total Seal gapless rings.
That is the same set up I have used in several car engines I have built, In fact you can buy just the second ring set from total seal if your pistons came with a set already.
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