103 Build
Grand HDF Member
Joined: Sep 2017
Posts: 4,359
Likes: 1,219
From: Dubuque, IA
While it's hard to say exactly where without cam specs like you said, but power should be ramping UP in that area. If the cams don't or aren't supposed to come on til like 4000rpm, then they're an even.worse choice than I thought considering how early they die as well.
That compression ratio is useless really. What I really wanted to know is corrected compression. Hard to say what that is based on the compression ratio without cam specs too. A compression test would have to be done.
Seems to me I recall those Grand Nationals having a real late dip like that only worse in.another build not too long ago.
Looks like they come on at 3500 and done at 5500 according to that 103 dyno. Now that's a nice flat curve.
Last edited by 60Gunner; Aug 4, 2022 at 08:59 AM.
Seasoned HDF Member
Joined: Dec 2005
Posts: 19,830
Likes: 7,968
From: poway
What I mean is that dip, while not a big one, is in a really bad area in the scheme if things to be losing power of any magnitude.
While it's hard to say exactly where without cam specs like you said, but power should be ramping UP in that area. If the cams don't or aren't supposed to come on til like 4000rpm, then they're an even.worse choice than I thought considering how early they die as well.
That compression ratio is useless really. What I really wanted to know is corrected compression. Hard to say what that is based on the compression ratio without cam specs too. A compression test would have to be done.
Seems to me I recall those Grand Nationals having a real late dip like that only worse in.another build not too long ago.
Looks like they come on at 3500 and done at 5500 according to that 103 dyno. Now that's a nice flat curve.
While it's hard to say exactly where without cam specs like you said, but power should be ramping UP in that area. If the cams don't or aren't supposed to come on til like 4000rpm, then they're an even.worse choice than I thought considering how early they die as well.
That compression ratio is useless really. What I really wanted to know is corrected compression. Hard to say what that is based on the compression ratio without cam specs too. A compression test would have to be done.
Seems to me I recall those Grand Nationals having a real late dip like that only worse in.another build not too long ago.
Looks like they come on at 3500 and done at 5500 according to that 103 dyno. Now that's a nice flat curve.
You really don't understand cams/motors do you.. Both are important.. Corrected compression is only good from idle to the somewhere around mid range then dynamic takes over. All 3 are important.. Dynamic is harder to figure.
Advanced
Joined: Aug 2011
Posts: 64
Likes: 15
From: New Mexico
Don did my cylinders and heads for my 107 build also and killed it. I went with S&S 585 cams and it rips. I'm a big fan of the KB pistons he uses. Your numbers are great, you have a great setup it sounds like and everything plays nice together as it should with a designed build.
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,090
From: Eastern IA
Got out for 236 miles today , put a big smile on my face . She gets up to triple digits quick , roll on 5th gear passing on 2 lane , it's a completely different bike , it just doesn't stop pulling. Vary smooth acceleration , vary happy with it.
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,090
From: Eastern IA
MAX-CELL Cam specs :
Valve Duration lift Timing 053 TDC
IN 244 590 20 - 44 194
EX 256 590 56 - 20 195
Other specs :
static compression 10.9 :1
corrected compression 9.85 :1
cold cranking compression 200.9 ( pressure )
Crankshaft run out .00075
Piston deck front .006
Piston deck rear .006
Front head volume 87cc
Rear Head volume 87cc
Valve Duration lift Timing 053 TDC
IN 244 590 20 - 44 194
EX 256 590 56 - 20 195
Other specs :
static compression 10.9 :1
corrected compression 9.85 :1
cold cranking compression 200.9 ( pressure )
Crankshaft run out .00075
Piston deck front .006
Piston deck rear .006
Front head volume 87cc
Rear Head volume 87cc
Road Warrior
Joined: Sep 2021
Posts: 1,789
Likes: 487
From: So fla
Enjoy it
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,090
From: Eastern IA
This is my motor's dyno sheet with the Fullsac DX pipe ...
Last edited by Stopit; Aug 6, 2022 at 10:30 AM.
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Stellar HDF Member
Joined: Jun 2018
Posts: 2,295
Likes: 494
From: WI
No matter how it is perceived, as long as your are content, 'for now' LOL, nice build. Stay safe on those 2-lanes!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Knowlede is Power...............................
Thanks for sharing
Knowlede is Power...............................
Thanks for sharing
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Stellar HDF Member
Joined: Nov 2012
Posts: 2,620
Likes: 1,090
From: Eastern IA
For now is the truth lol
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