Final Evo Build
Club Member
Joined: Apr 2011
Posts: 5,802
Likes: 7,829
From: SE Louisiana
98hotrod, lesson learned, after some heat cycles on my TC build, the compression shows 202, dead on.
Can't get an accurate reading until it's run and lifters bled of air and fully pumped.
Can't get an accurate reading until it's run and lifters bled of air and fully pumped.
Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,614
From: Poolville
First, I'd like to thank all of you for the nice words. It's appreciated.......
Now, I did go out for a little ride last night. The bike runs extremely well and goes through the gears very quickly..... But I have a little Dilemma. I know this sounds a little crazy but I intended this build for my W6 EXP cam that I had Bob Wood specially grind for me. I mean isn't that where the build is built around, "The Cam"......... It's a W8 cam with opening and closing times of the valves changed a few degrees.
Now with the way I messed up the numbers for milling the pistons to achieve the right compression that I needed for the W9B I actually ended up with 10.44:1 static which is a little low for that cam, it really needs 11.0:1 static. so last night I decided to swap out the cams. Only took a couple of hours and i got it running. The idle is a little tamer but the bottom end from 2000 rpm is nasty....Rolling along in first gear at 2000 rpm I nailed the throttle and the rear tire screamed. 2nd gear fishtailed as third was still spinning...... I have no idea what rpm I shifted at but I really do like this cam better than the W9B..... It hits hard in the low and midrange......
Not only was the performance on the bottom end increased but my dynamic compression also went up to 200-202 psi. Its' hard to tell with my gauges. I have 2 compression gauges and they both go in 5 psi increments.....
I was very happy with the W9B but I'm freakin loving this W6EXP cam.... I'll try to get more videos up today.....
Now, I did go out for a little ride last night. The bike runs extremely well and goes through the gears very quickly..... But I have a little Dilemma. I know this sounds a little crazy but I intended this build for my W6 EXP cam that I had Bob Wood specially grind for me. I mean isn't that where the build is built around, "The Cam"......... It's a W8 cam with opening and closing times of the valves changed a few degrees.
Now with the way I messed up the numbers for milling the pistons to achieve the right compression that I needed for the W9B I actually ended up with 10.44:1 static which is a little low for that cam, it really needs 11.0:1 static. so last night I decided to swap out the cams. Only took a couple of hours and i got it running. The idle is a little tamer but the bottom end from 2000 rpm is nasty....Rolling along in first gear at 2000 rpm I nailed the throttle and the rear tire screamed. 2nd gear fishtailed as third was still spinning...... I have no idea what rpm I shifted at but I really do like this cam better than the W9B..... It hits hard in the low and midrange......
Not only was the performance on the bottom end increased but my dynamic compression also went up to 200-202 psi. Its' hard to tell with my gauges. I have 2 compression gauges and they both go in 5 psi increments.....
I was very happy with the W9B but I'm freakin loving this W6EXP cam.... I'll try to get more videos up today.....
Last edited by 98hotrodfatboy; May 27, 2017 at 06:55 AM.
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,079
Likes: 2,151
From: Ohio
Think you will be better off with that cam and the engine pulling hard in a real riding rpm range. Theory of hp engines is to run the rpm's up to get power but power being like drugs, the rpm range will keep going up and parts stress WILL become a factor
When good running HD engines are put against each other in a good ole boy straight away throttle roll, doesn't matter how much engine you have, the guy who rolls the throttle first is always hard to catch. The guy who has to drop gears to get his rpm into a high rpm power range won't catch a quick accellerating nasty mid range engine. Setting on that low and nasty mid range power you won't need to run the R's up into area's a Harley engine isn't designed for plus it makes real world riding a simple task.
Things I have noticed about strong mid range power is it seems like your speed doubles every 20 feet and can get in trouble because your brain isn't processing the speed to distance travel that can get you in trouble on back roads and brakes become a important factor until your brain adjusts. No doubt that engine can still climb into rpm's and be ready for rev limiter bump, you have already noticed a bigger cube engine can build R's quickly when it is healthy and once again the human brain takes a while to adjust.
Congrats, get it right and leave it alone, just ride the hell out of it because we all know the story of 3 more horse power
When good running HD engines are put against each other in a good ole boy straight away throttle roll, doesn't matter how much engine you have, the guy who rolls the throttle first is always hard to catch. The guy who has to drop gears to get his rpm into a high rpm power range won't catch a quick accellerating nasty mid range engine. Setting on that low and nasty mid range power you won't need to run the R's up into area's a Harley engine isn't designed for plus it makes real world riding a simple task.
Things I have noticed about strong mid range power is it seems like your speed doubles every 20 feet and can get in trouble because your brain isn't processing the speed to distance travel that can get you in trouble on back roads and brakes become a important factor until your brain adjusts. No doubt that engine can still climb into rpm's and be ready for rev limiter bump, you have already noticed a bigger cube engine can build R's quickly when it is healthy and once again the human brain takes a while to adjust.
Congrats, get it right and leave it alone, just ride the hell out of it because we all know the story of 3 more horse power
Last edited by 1997bagger; May 27, 2017 at 07:47 AM.
Stellar HDF Member
Joined: Jan 2015
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From: ct
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Thread Starter
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Seasoned HDF Member
Joined: Mar 2010
Posts: 21,092
Likes: 7,614
From: Poolville
Think you will be better off with that cam and the engine pulling hard in a real riding rpm range. Theory of hp engines is to run the rpm's up to get power but power being like drugs, the rpm range will keep going up and parts stress WILL become a factor
When good running HD engines are put against each other in a good ole boy straight away throttle roll, doesn't matter how much engine you have, the guy who rolls the throttle first is always hard to catch. The guy who has to drop gears to get his rpm into a high rpm power range won't catch a quick accellerating nasty mid range engine. Setting on that low and nasty mid range power you won't need to run the R's up into area's a Harley engine isn't designed for plus it makes real world riding a simple task.
Things I have noticed about strong mid range power is it seems like your speed doubles every 20 feet and can get in trouble because your brain isn't processing the speed to distance travel that can get you in trouble on back roads and brakes become a important factor until your brain adjusts. No doubt that engine can still climb into rpm's and be ready for rev limiter bump, you have already noticed a bigger cube engine can build R's quickly when it is healthy and once again the human brain takes a while to adjust.
Congrats, get it right and leave it alone, just ride the hell out of it because we all know the story of 3 more horse power
When good running HD engines are put against each other in a good ole boy straight away throttle roll, doesn't matter how much engine you have, the guy who rolls the throttle first is always hard to catch. The guy who has to drop gears to get his rpm into a high rpm power range won't catch a quick accellerating nasty mid range engine. Setting on that low and nasty mid range power you won't need to run the R's up into area's a Harley engine isn't designed for plus it makes real world riding a simple task.
Things I have noticed about strong mid range power is it seems like your speed doubles every 20 feet and can get in trouble because your brain isn't processing the speed to distance travel that can get you in trouble on back roads and brakes become a important factor until your brain adjusts. No doubt that engine can still climb into rpm's and be ready for rev limiter bump, you have already noticed a bigger cube engine can build R's quickly when it is healthy and once again the human brain takes a while to adjust.
Congrats, get it right and leave it alone, just ride the hell out of it because we all know the story of 3 more horse power
Funny you say every 20' your speed doubles because I'm going through my gears so quickly. I'm running a 3.26:1 overall gear ratio and feel as if I need to drop it to a 3.15 to enjoy the torque even more.....
Yea, nut, **** it's all the same.... But the way I prefer to be.... Thanx......
Seasoned HDF Member
Joined: Aug 2008
Posts: 5,079
Likes: 2,151
From: Ohio
[QUOTE]
Yea with a light bike you could most likely drop some gear ratio to load the engine, your engine set up should still pull when it isn't in it's sweet spot and the WTF light comes on when it hits it.
So much truth there and until you experience a larger cubic inch motor it's hard to imagine....
Funny you say every 20' your speed doubles because I'm going through my gears so quickly. I'm running a 3.26:1 overall gear ratio and feel as if I need to drop it to a 3.15 to enjoy the torque even more.....
Funny you say every 20' your speed doubles because I'm going through my gears so quickly. I'm running a 3.26:1 overall gear ratio and feel as if I need to drop it to a 3.15 to enjoy the torque even more.....