High compression 103 - Road Glide Forums
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post #1 of 19 (permalink) Old 08-24-2018, 07:54 PM Thread Starter
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High compression 103

Searched on this topic and couldn't really find anything. All ended up with build a 107 but I dont have that money at this point. Is it worth it to do high compression pistons. I was thinking high compression pistons different valve springs and a high lift cam. Anyone have thoughts on this combo.
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post #2 of 19 (permalink) Old 08-24-2018, 08:18 PM
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Searched on this topic and couldn't really find anything. All ended up with build a 107 but I dont have that money at this point. Is it worth it to do high compression pistons. I was thinking high compression pistons different valve springs and a high lift cam. Anyone have thoughts on this combo.
I think high comp Pistons, rings, cyl hone and valve springs are a waste of money. Just do a cam and call her Good. Lots of good cam options making decent power. I donít think youíll get your moneys worth out of the other bits and bobs.
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post #3 of 19 (permalink) Old 08-24-2018, 09:49 PM
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Searched on this topic and couldn't really find anything. All ended up with build a 107 but I dont have that money at this point. Is it worth it to do high compression pistons. I was thinking high compression pistons different valve springs and a high lift cam. Anyone have thoughts on this combo.
I think high comp Pistons, rings, cyl hone and valve springs are a waste of money. Just do a cam and call her Good. Lots of good cam options making decent power. I don’t think you’ll get your moneys worth out of the other bits and bobs.
Let’s not forget milling the heads. You can milk the heads and do .030 head gasket and bump the compession to 10 plus what ever the mill is. I say 10.5 and call it good. Depending on cam and valve springs of course. The higher the lift the stouter the springs need to be and pushrods of course. Those 103 can get some pretty incredible numbers if done right. Just saying....


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2016 RG Custom Vivid Black
Freedom Union 2/1, Andrews 57H cam, Mach 2 A/C, .030 head gasket
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post #4 of 19 (permalink) Old 08-25-2018, 07:58 AM
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Good head job and a good cam , I am a S&S loyalist , and the 551 is a good torque cam that pulls hard to around 4000 , which is where most motors live .. Also the 570 and 585 .. I believe the 585 is as high as you can go with out some head work and different pistons ..

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post #5 of 19 (permalink) Old 08-25-2018, 08:04 AM
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Compression isn't the issue with the 103. Its the heads. So until you can afford to CNC the heads and put larger intake valves in, I would not pull the top end down unless it needs rings. You can still make 100HP+ with just cams, pipes and a good breather.

And if money is an issue, don't start until you have the piggy bank well stocked. Chances are you'll end up needing to split the cases and replace the wheels. If the oem set wobbles, and most do, you'll be needing to replace them too.


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Last edited by Thermodyne; 08-25-2018 at 08:06 AM.
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post #6 of 19 (permalink) Old 08-29-2018, 11:19 AM Thread Starter
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So what I have now is d&d fat cat 2 into1, sert, and a burst style intake. I'm getting a thundermax tuner from a buddy and was thinking cams for the winter. I read alot about milling the heads messes with the tb mounting. Is there no extra power to be had with the high compression pistons.
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post #7 of 19 (permalink) Old 08-29-2018, 01:54 PM
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well ya have the BEST exhaust , yeah there is power to be had with more compression . depends on what you want ... if ya bump up the compression , I would stay around 10.2-10.5 tops .. Get your heads done , don't need to be milled , just port and polish and put bigger valves in .. Anything over a 585 in the TC103 needs head work and valve spring changes , and some different pistons ..

Is this an interstate eater or not ?? That would direct me in my build ........

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post #8 of 19 (permalink) Old 08-29-2018, 02:09 PM
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You can milk the heads. Just saying....
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Good head job ..
Do you guys both have your minds somewhere else today? I may have to restrict your "guy" time together.


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post #9 of 19 (permalink) Old 08-29-2018, 03:57 PM Thread Starter
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I was thinking fuel moto level c heads and no more then 10.5 to 1. I ride mostly around 3000 rpm. Ride to work every day interstate and weekend just ripping and what not. I'm really looking for just a ass kicking quick to 120 bike that burns the tire all the way they there. I will end up with a 126 or bigger but that's about 3 years down the road. Untill then I will stay with the 103.
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post #10 of 19 (permalink) Old 08-29-2018, 03:58 PM Thread Starter
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And COME ON GUYS THIS IS A FAMILY FORUM
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