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Old 08-26-2010, 09:11 PM   #121
TrainedChimp
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Quote:
Originally Posted by Sergiok
Do you have an aftermarket can? A Dobeck/Wunderlich or other type of controller on the bike?
Me? No, I don't have anything like that. I have done Steptoe's CCP jumper trick and I have Booster plug.
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Old 08-28-2010, 04:12 AM   #122
lennie
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I have good news.

I went to visit my machinist friend Brian today and used his mill to drill the locating pin holes with a 3 mm carbide drill.

In measuring a sample of 12 sprockets the size ranged from 2.91 mm to 2.93 mm.

This along with the loctite securing the pins explains the effort required to remove the pins with a drift.

After drilling the holes they measured 2.98 mm to 2.99 mm.

I have calculated the I have removed between 1.6 thou and 2.1 thou from the holes.

This now allows the pins to be fitted with light pressure from my small hammer for fitting with no sign of the existing cracks opening at all.

I will post photos tomorrow as I have had long day and wish to rest.

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Old 08-28-2010, 05:15 AM   #123
Andrew
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How did I miss this mod, over the past seven years? Sounds like an easy boost to low-end torque, and something I can easily handle at home.
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Old 08-28-2010, 07:59 AM   #124
lightfighter
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Quote:
Originally Posted by Andrew
How did I miss this mod, over the past seven years? Sounds like an easy boost to low-end torque, and something I can easily handle at home.
i have only ever seen it mentioned here in the gspot, and on a sport boxer forum that lennie is on.

but they are good kit... "easy" is relative, but if you have a mechanical background, understand valve trains, and can read instructions... managable.
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Old 08-29-2010, 03:43 PM   #125
lennie
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Andrew,

I have been very low profile with my marketing over the last 10 years.

Install is easy at home. Take time, mark all timing marks, safety wire the chain, and be very careful with removal and install of the sprockets. I usually insert a phillip screw driver into the cam bolt hole to slide the sprocket out.

You will be more than happy with the results.
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Old 08-29-2010, 07:10 PM   #126
sbrownn
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Bolt failed

One of my cam sprocket bolts was over stressed upon removal. I don't know whether it had been done during assembly or when I loosened it, but when I put it back in it wouldn't torque down; just kept turning. I was really lucky I didn't twist it off in the cam shaft. Replaced them both.
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Old 08-29-2010, 07:31 PM   #127
lennie
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Adventurrer,

Best to replace the bolts with newies.

It can take a lot of pressure to get the bolts loose in the first place.
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Old 08-29-2010, 07:37 PM   #128
Kilo Sierra
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Lennie,

Please resend your last email from Thursday(I think) to me...I accidentally deleted it.

tks,
ks
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Old 08-29-2010, 08:10 PM   #129
Andrew
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Hmmm... basic question here, how do the new sprockets do anything different than if I were to just skip the chain over by a tooth with the existing sprockets? Seems that would achieve the same effect, of altering the cam timing... No? I have not taken an oilhead's head apart, but looking at the picture, it must be that the four holes fit onto pins on the camshaft, and so set the relative positions of teeth, TDC arrows, and cam lobes.
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Old 08-30-2010, 01:51 AM   #130
The Other JC
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Quote:
Originally Posted by Andrew
Hmmm... basic question here, how do the new sprockets do anything different than if I were to just skip the chain over by a tooth with the existing sprockets? Seems that would achieve the same effect, of altering the cam timing... No? I have not taken an oilhead's head apart, but looking at the picture, it must be that the four holes fit onto pins on the camshaft, and so set the relative positions of teeth, TDC arrows, and cam lobes.
360 degrees / 17 teeth would give a 21 degree turn per tooth. Quite a dramatic difference. Lennie has done the trial and error to get the best performance envelope at 9 degrees.
The sprocket is held in relation to the cam by a nipple, then 65NM of torque

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Old 08-30-2010, 05:37 AM   #131
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Quote:
Originally Posted by The Other JC
360 degrees / 17 teeth would give a 21 degree turn per tooth. Quite a dramatic difference. Lennie has done the trial and error to get the best performance envelope at 9 degrees.
The sprocket is held in relation to the cam by a nipple, then 65NM of torque
Ah, yes... 17 teeth... jumping just one would give about 21 degrees...

Sometimes my head gets ahead of my math.
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Old 08-30-2010, 05:57 AM   #132
The Other JC
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For the curious. The nipple placement is moved to account for the percentage degree change.
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Old 08-30-2010, 08:48 AM   #133
dede
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curious

Quote:
Originally Posted by The Other JC

For the curious. The nipple placement is moved to account for the percentage degree change.

Haven't seen the inside of an assembly. If the bolt is in the center holding the sprocket to the cam shaft and the alignment pin locates the sprocket radially. What do the rest of the holes do?
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Old 08-30-2010, 10:29 AM   #134
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Yes, the large center hole is where the bolt attaches. The smallest 5th hole is where the tab on the reluctor/camshaft timing device on the right head locates and is also held in by the main bolt. Thankfully the other 4 holes do not hold any fasteners or other devices.

Chuck
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Old 08-30-2010, 12:07 PM   #135
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Just weight reduction...
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