625 cams
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Road Captain
Joined: Aug 2014
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From: Central Arkansas
625 cams
Curious as to what kind of power the Tman 625 will produce compared to the S&S 625 either in a 103, 106, or 107.
Anyone running these setups?
Don't the Tmans come on early on? I'm running an Andrews 57. Would the Tmans come on earlier than my current setup?
Anyone running these setups?
Don't the Tmans come on early on? I'm running an Andrews 57. Would the Tmans come on earlier than my current setup?
When do the 57s really start to pop?
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Road Captain
Joined: Aug 2014
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From: Central Arkansas
Kirby,
Is this not comparable to what I already have? I am set at 10.1 and this graph shows 10.1.
Looking over ( dyno runs) of many different cams i would call most of them comparable. The only cam i didnt see any runs for is the woods 999, but i dont think its what you are looking for. Calls for 10.5 comp. and the usaul other mods, but for the bike to come on at a lower rpm dont we usaully have to give a little back up top? Maybe a lower tooth drive would put you right where you want be, if possible for the fxsb.
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From: san antonio
How do you know you static CR is set at 10:1? IIRC, you posted CCP at 185/188 a while back which would indicate to me that static CR is about 9.8?
I don't think your exhaust is helping you either. I would bet replacing the OEM head gasket with a .030" head gasket will help with that flat TQ line from 2600-3300 and perhaps move the curve to the left a bit as well as produce higher peak numbers. A better exhaust will help with the flat TQ line and moving the curve to the left as well; like the D&D pipe.
I would not throw the baby out with the bathwater; you just need to improve on what you have.
I don't think your exhaust is helping you either. I would bet replacing the OEM head gasket with a .030" head gasket will help with that flat TQ line from 2600-3300 and perhaps move the curve to the left a bit as well as produce higher peak numbers. A better exhaust will help with the flat TQ line and moving the curve to the left as well; like the D&D pipe.
I would not throw the baby out with the bathwater; you just need to improve on what you have.
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Thread Starter
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Road Captain
Joined: Aug 2014
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From: Central Arkansas
That makes sense. I didn't realize I was as low as 9.8.
Moving it left isn't the ultimate goal the 57's run great. I was just wanting more power keeping the power where I'm at or left of it.
I installed a .030 head gasket. What pistons would get me to where I need to be?
Moving it left isn't the ultimate goal the 57's run great. I was just wanting more power keeping the power where I'm at or left of it.
I installed a .030 head gasket. What pistons would get me to where I need to be?
Last edited by Pigbacon; Nov 30, 2014 at 11:54 AM.
HDF Community Team
Joined: Jun 2006
Posts: 12,780
Likes: 2,609
From: san antonio
That makes sense. I didn't realize I was as low as 9.8.
Moving it left isn't the ultimate goal the 57's run great. I was just wanting more power keeping the power where I'm at or left of it.
I installed a .030 head gasket. What pistons would get me to where I need to be?
Moving it left isn't the ultimate goal the 57's run great. I was just wanting more power keeping the power where I'm at or left of it.
I installed a .030 head gasket. What pistons would get me to where I need to be?
If you just want more, more cam will be required which will likely require better heads (IIRC your heads are Hillside Stage 1), larger T/B (you can have the OEM T/B bored) to supplement more cam as well as better 2:1 exhaust. You are still fighting the large back tire and the counter balancers that are power robbers; that big *** tire is also holding the initial TQ down as it robs power to get it spinning.
I still think a trans pulley change would be a more cost effective modification and would go that route before digging into the motor again. JMHO.