Performance Timing Sprocket Group Buy

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Greg in Oz
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Performance Timing Sprocket Group Buy

Post by Greg in Oz » Fri 01 Apr, 2016 1:32 am

I am looking for MB owners to participate in a group buy of performance timing chain sprockets.

The custom manufactured sprocket will replace the original timing chain sprocket on the crankshaft. It allows the engine to operate at higher RPM and deliver increased power output (between 8% and 12% increase). This is cleverly yet simply achieved by way of the custom sprocket having one less tooth than the original sprocket. The result is the camshaft (or camshafts on twin cam and V8 engines) rotate at a marginally lower speed relative to the crankshaft than previously and therefore allow the crankshaft to achieve higher speed before being limited by issues such as valve bounce. Valve opening duration is also effectively increased for any given engine speed at considerably lower cost than replacing the camshaft (or camshafts) with performance items with a different grind.

No other modifications will be required to the engine as the chain tensioner will easily be able to take up the slight extra chain slack resulting from the crankshaft sprocket having one less tooth. Obviously, when fitting the new sprocket, a new chain, tensioner and chain guide rails should be fitted.

The attached image shows a prototype sprocket I have had manufactured to suit a double row timing chain. Price is yet to be determined and will obviously be lower if the order we place is for a larger number of sprockets. Sprockets will be made available for single and double row chains for various engines dependent on interest expressed. I am looking at having them manufactured for the M102 (both 8V and 16V), M103, M104, M110, M116 and M117. Other engines will be included if demand is sufficient.

Please reply here to express your interest in participating in the group buy and please indicate which engine you have (including model year to determine whether single or double row chain).
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107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Greg in Oz
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Re: Performance Timing Sprocket Group Buy

Post by Greg in Oz » Fri 01 Apr, 2016 11:35 am

Had a bit of a set back guys. Thought I was on track to have the modification completed on my 500SLC ready for tomorrow's Classic Rally Club event but when I tried starting it there was a funny noise and now it won't turn over. For now I'll push that one aside as it's a good job I've got my 190E Cosworth as a backup. If I get cracking now I'll have it modified in time to run it tomorrow instead. Better not hang around wasting time here.

PS. Also forgot to mention that I reckon if I can have a firm order in by midday today, I should be able to convince the machine shop to do the sprockets in 99.9% pure unobtanium rather than steel.
107023 - 350SLC: 1973, 3sp auto, icon gold, parchment MBtex (sold July 2012 after 29 years ownership)
107026 - 500SLC: 1981, 4sp auto, thistle green, green velour
124090 - 300TE: 1990, 4sp auto, arctic white, cream-beige MBtex
124090 - 300TE: 1992, 4sp auto, malachite (spruce green), black MBtex
201024 - 190E-2.0: 1985, 5sp manual, black, black MBtex
201028 - 190E-2.3 Sportline: 1990, 5sp manual, arctic white, blue leather
201028 - 190E-2.3: 1992, 4sp auto, blueblack, grey MBtex
201028 - 190E-2.3 Sportline: 1990, 4sp auto, signal red, black cloth (parts car)
201034 - 190E-2.3-16 Cosworth: 1985, 5sp manual, blueblack, black leather
YG2S8 - Mini Clubman GT: 1972, 4sp manual, blue, parchment vinyl (my first car which I still own)

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Bartman4800
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Re: Performance Timing Sprocket Group Buy

Post by Bartman4800 » Fri 01 Apr, 2016 1:18 pm

So how much would one of these be Greg, considering you are using Unobtanium? :dontknow:
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

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Tony From West Oz
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Re: Performance Timing Sprocket Group Buy

Post by Tony From West Oz » Fri 01 Apr, 2016 4:05 pm

Greg in Oz wrote:I am looking for MB owners to participate in a group buy of performance timing chain sprockets.

The custom manufactured sprocket will replace the original timing chain sprocket on the crankshaft. It allows the engine to operate at higher RPM and deliver increased power output (between 8% and 12% increase). This is cleverly yet simply achieved by way of the custom sprocket having one less tooth than the original sprocket. The result is the camshaft (or camshafts on twin cam and V8 engines) rotate at a marginally lower speed relative to the crankshaft than previously and therefore allow the crankshaft to achieve higher speed before being limited by issues such as valve bounce. Valve opening duration is also effectively increased for any given engine speed at considerably lower cost than replacing the camshaft (or camshafts) with performance items with a different grind.

No other modifications will be required to the engine as the chain tensioner will easily be able to take up the slight extra chain slack resulting from the crankshaft sprocket having one less tooth. Obviously, when fitting the new sprocket, a new chain, tensioner and chain guide rails should be fitted.

The attached image shows a prototype sprocket I have had manufactured to suit a double row timing chain. Price is yet to be determined and will obviously be lower if the order we place is for a larger number of sprockets. Sprockets will be made available for single and double row chains for various engines dependent on interest expressed. I am looking at having them manufactured for the M102 (both 8V and 16V), M103, M104, M110, M116 and M117. Other engines will be included if demand is sufficient.

Please reply here to express your interest in participating in the group buy and please indicate which engine you have (including model year to determine whether single or double row chain).
snip
Greg, if you change the crank sprocket you HAVE to change the cam Sprockets too.If you take 1 tooth out of the crank sprocket you need to take two from each of the cam sprockets too. This ensures that the relative speeds of the crank and cams are the same. This would nullify your "advantage" of having fewer teeth on the crank sprocket.

Taking one tooth out of the crank sprocket will result in the cam rotating at a different ratio than the 2:1 of the stock sprockets, resulting in piston - valve impact.
Sorry to hear that you tried to run the engine in this condition. I hope this mistake is not too expensive to rectify.

Tony
Life is a journey, with problems to solve, lessons to learn, but most of all, experiences to enjoy.

'83 W123 300D 325000km (Wife's car Josephine - sold).
'84 W123 300D replaced good OM617 912 with OM617 952 and enjoyed having good acceleration for the first time since first driving a 300D in 2002 - became engine and trans donor for 300CD Turbodiesel conversion. Now parted out.
'86 W124 300D sold (Wife's old car - sold )
'85 W123 300CD, 275 000km (Fatmobile) rebuilt turbodiesel from previous Fatmobile transplanted into 280CE (SOLD)
'99 W202 C250 Turbodiesel (my darling Wife's car - Sold)
'98 W202 C250 Turbodiesel (my car - Sold)
'06 Ssanyong Musso Crew Cab 2WD Ute (OM662 diesel and Auto Transmission)

ChristoC
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Performance Timing Sprocket Group Buy

Post by ChristoC » Fri 01 Apr, 2016 5:35 pm

Tony, you are the master of understatement. [emoji23]

Greg, your "funny noise" - was that funny haha or funny-as-a-burning-orphanage ?
BTW that mod is enhanced if you replace the engine oil with distilled water.

April - what a great beginning to the month! ⚡️

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Re: Performance Timing Sprocket Group Buy

Post by CraigB » Fri 01 Apr, 2016 8:47 pm

Purely due to the author i did read it right through thinking, but it can't work can it...... and then noticed the date. Well done Greg.
Craig Baulderstone
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Re: Performance Timing Sprocket Group Buy

Post by T-Modell » Fri 01 Apr, 2016 10:04 pm

Yep a good one ... I think I can stop looking for a supplier of unobtanium here :laughing6: :laughing6:

Thomas :notworthy:
---------------------------------------------------------------
1967 W111 250SE Cabriolet, horizon blue
1973 W115 220D 5.0 Pick-Up Argentina, work in progress 2017/18/19
1986 R107 500SL, arctic white, the midlife crisis viagra replacement
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Bartman4800
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Re: Performance Timing Sprocket Group Buy

Post by Bartman4800 » Sat 02 Apr, 2016 2:17 pm

In the subsea oil and gas industry, we use unobtanium all the time.

Stronger than most steel alloys, better crevice corrosion lifespan than SAF 2507, lighter than titanium T-6, shinier than polished chrome. What more do you want at only 100 aud/kg :laughing6:

Well done Greg :notworthy:
1963 220 Sb Sedan "Kermit" (Australian Assembly)
1960 220 Sb Sedan "Zum Schlachten" (Early German Assembly, with a torsion bar spring for the bonnet) - Stored in Country WA
1981 Subaru Brumby 1.8 with Weber and 5-speed box "little utie" - Sold to another enthusiast!
2006 Ford Focus "daily driver"
2002 VW Passat V6 30V Station Wagon (SOLD - This car into a money pit)
2011 Kia Sportage "Missus commuter Bus"
2002 Mitsubishi Rosa Bus (converting it to a motor home)

kiqnkf
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Re: Performance Timing Sprocket Group Buy

Post by kiqnkf » Sun 10 Apr, 2016 4:55 pm

I represent "Supercheap" auto parts, and we sell overpriced garbage that does not work for very long, if at all, to all manner of retards that dare venture into one of our branches.

This sounds like a faeces idea, so I would like to purchase 1000 of these, however, I will need them manufactured in china, and due to the prohibitive cost, and un-obtainability of 99.9% pure unobtanium, I, in keeping with our companies policy of "Advertise super-cheap, pay supercheap, but mark up until the pricetag runs out of room" I will need the material to be changed to something a little more cost-effectively.

After talking to our tech-support team (14 y.o. Eliza, and her 12 y.o. twin sister Liza) we think the material "gorgonzola" should maintain the nescessary structural integrity required for this project.

As per usual, we will need payment terms in line with, again, company policy, we pay yearly on 35th Octember, all of our suppliers, and would need you to be agreeable to this.

Any other questions regarding our deal, can be directed directly to Supercheap tech support.

Regards, S.Cheap.

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