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  #11  
Old 19th January 2015
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Aaron, I recently switched from n4 cams to Impact 560's. My bike seems to rev higher now but seems a little lazy getting there. I went a shade slower in the eighth but I only got a few runs in so I am still sneaking up on the tune. My cranking compression is 185 lbs. I am running stock xb heads with a .030" squish which calculates to 9.73:1 static. Is this too low? Most of the builds I have seen with these cams are at 10.5:1. I am gonna run at the track this weekend and hopefully get in plenty of runs to dial it in. oddly enough the thing seems to want less fuel and I thought more overlap would lean it out but I picked up 3 mph going from a 170 to a 162.5 main. Any thoughts? Thanks, Dave.
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  #12  
Old 19th January 2015
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Quote:
Originally Posted by madnss View Post
What's the number to punch in for the piston dome on the 30° domed pistons?
OK, so we have 30 degree 1250 pistons in the following dome sizes:
  • -1.3cc
  • .35cc
  • 9.7cc
  • 11.35cc
  • 15.35cc
  • 19.35cc (yours)
  • 27.35cc
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  #13  
Old 19th January 2015
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Quote:
Originally Posted by Fe Long View Post
How close does the calculator's effective compression ratio match up with the observed PSI being read from a compression tester when using a Gamma Factor in the 1.35 - 1.4 range for the CR's exponent?

At your elevation you probably would use an base atmospheric pressure of 14.5? maybe?

I was curious as to the correlation and comparrisons between similar ratios but working in different setups.

Thank you;
Aw geez, you're really going to make me go look up the formula I used?

Ok ... just a minute ... here you go ... the program uses 1.2 and 14.7
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  #14  
Old 19th January 2015
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Quote:
Originally Posted by davesz1r View Post
Aaron, I recently switched from n4 cams to Impact 560's. My bike seems to rev higher now but seems a little lazy getting there. I went a shade slower in the eighth but I only got a few runs in so I am still sneaking up on the tune. My cranking compression is 185 lbs. I am running stock xb heads with a .030" squish which calculates to 9.73:1 static. Is this too low? Most of the builds I have seen with these cams are at 10.5:1. I am gonna run at the track this weekend and hopefully get in plenty of runs to dial it in. oddly enough the thing seems to want less fuel and I thought more overlap would lean it out but I picked up 3 mph going from a 170 to a 162.5 main. Any thoughts? Thanks, Dave.
Yeah, 9.73 static only gives 8.6 corrected & 180psi. That's certainly not pushing things. There are a lot of dynamic things going on with a bike that's moving at speed, don't argue with the time slip is my advice.
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  #15  
Old 20th January 2015
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Originally Posted by aswracing View Post
Aw geez, you're really going to make me go look up the formula I used?

Ok ... just a minute ... here you go ... the program uses 1.2 and 14.7
Thank you Aaron, those numbers really help to explain the results I was getting - very much appreciated.
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  #16  
Old 20th January 2015
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I assume those dome volumes take the valve pockets in to consideration so those are net numbers ?
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  #17  
Old 20th February 2015
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Thanks Aaron, I ordered one of your 1250 blem kits yesterday and I already have a UPS notice that it's ready to ship! You guys rock!!!
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  #18  
Old 20th February 2015
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Quote:
Originally Posted by davesz1r View Post
Thanks Aaron, I ordered one of your 1250 blem kits yesterday and I already have a UPS notice that it's ready to ship! You guys rock!!!
Thanks for your business Dave, we sincerely appreciate it.
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Old 20th February 2015
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Well I came up with 25.9 CC domes with no sealer above the second ring.

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  #20  
Old 23rd March 2015
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Quote:
Originally Posted by davesz1r View Post
Aaron, I recently switched from n4 cams to Impact 560's. My bike seems to rev higher now but seems a little lazy getting there. I went a shade slower in the eighth but I only got a few runs in so I am still sneaking up on the tune. My cranking compression is 185 lbs. I am running stock xb heads with a .030" squish which calculates to 9.73:1 static. Is this too low? Most of the builds I have seen with these cams are at 10.5:1. I am gonna run at the track this weekend and hopefully get in plenty of runs to dial it in. oddly enough the thing seems to want less fuel and I thought more overlap would lean it out but I picked up 3 mph going from a 170 to a 162.5 main. Any thoughts? Thanks, Dave.
Ok, Hammer 1250 kit installed and broke in. front = 200 lbs. rear = 210 lbs. 7.506 1/8 mile et at 94.871 mph! Hell yeah! Just need a better rider.
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