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Join Date: Mar 2006
Location: South Hill Puyallup
Posts: 468
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CMW Motorsports Stroker kit
Does anyone have experience with CMW's stroker kits? Has anyone here built a motor using one of their kits? Specifically the kit that takes a 3.0/3.2 to 3.9? Will this kit build a street motor with lots of torque or a high rpm/hp motor?
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86 Carrera 70 914-6 |
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11-04-2008, 07:37 PM
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Join Date: Aug 2006
Location: Los Osos, Ca
Posts: 398
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I'm sorry, I don't know about their kits, but I do know that generally longer relative strokes are torquier and larger relative bores rev better. Of course there will be exceptions to this.
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11-04-2008, 08:10 PM
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Join Date: Oct 2001
Location: Momence, IL 60954
Posts: 1,911
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I've seen photos just recently on Henry's crank thread of one of CMW's cranks that they have made up billet. Look like great stuff. I know the cylinders they include are also top notch since I make them for them :-)
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Charles Navarro President, LN Engineering and Bilt Racing Service http://www.LNengineering.com Home of Nickies, IMS Retrofit, and IMS Solution |
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11-05-2008, 04:34 AM
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CMW Strokers
I have two CMW stroker engines.
one is a 2.9 based on a 2.7 7r. 93mm Bore, the second is a 3.7 based on a 3.0 case and crank, with 100mm jugs. The stroke is gained via crank mod. Twin plugged, currently put out 395 HP at the wheels with undersized throttle bodies.. Steve at CMW is very good to deal with.. We are currently doing a 4.2 kit, but it is still in the development stage on our end.. |
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11-06-2008, 03:37 AM
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Join Date: Mar 2006
Location: South Hill Puyallup
Posts: 468
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ONQRACing,
The 3.7 liter is it a race motor? how high is the compression? What kind of rpm are you attaining? What rpm will the internals safely tolerate? I ask because I am interested in building a street/track motor for my carrera with the 3.9 kit. I would like to attain 350hp with carbs or ITB's with a motor that has some longevity for the street. No emmission requirements where I am at.
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86 Carrera 70 914-6 |
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11-06-2008, 11:14 AM
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3.7
We have the MoTeC set to a modest 7600 limit, but the dyno runs were in the 9's to see peak HP and TQ. I am running 964 cams which have about as large a lobe as will fit in the cam towers. the Compression is 14:1-1 but we are adding a shim to give more than a mm clearance, so we need to recalculate, SB around 13:1-1.
The pistons are JE that CMW machines the dome and valve relief for our spec. Full race, running TMW ITB's 3003 (undersized) off the 2.9 for now. Headers 1 5/8into SuperCraps. Very reliable, RPM is limited to keep meantime between rebuilds down. We get about 35 hours out of a top-end.. Both are torn down for winter rebuilds as we speak. Hope this helps.. Andrew |
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11-06-2008, 11:24 AM
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Less brakes, more gas!
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Ok Andrew!
THIS THREAD IS USELESS WITH OUT PICS!  -michael
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 Michael '82 Euro SC 'Track Rat' 22/29 Hollows, 22/22 Tarrets, Full ERPB F/R, Rennline Tri Brace, Glass bumpers, Pro 2000's, 5 pts, blah blah blah '13 Cayenne GTS |
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11-06-2008, 02:58 PM
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3.7 pics
pics of the 3.7 long..
   
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11-06-2008, 03:30 PM
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Quote:
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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11-06-2008, 03:39 PM
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Not bad for about 24.5k.. Economy what??? Might be letting the 2.9 go after rebuild.. Would like an RSR 3.8.. Santa, you listening??
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11-06-2008, 03:52 PM
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What cam/compression running on the 2.9? Assume you dyno'd it at some point?
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'79 930/934 replica 80 RSR-look(Now in Sicily) 914/6 2.7 (Projekt 908/3) 1965 Karman Ghia-Class winner 2007 Carrera Panamericana/Ducati 900ss/GhezziBrian STW D-Zug Produkte/D-Zug.com |
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11-06-2008, 04:08 PM
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2.9 specs
The 2.9 runns leaded 110, and dyno's 305 at the flywheel. As for the Cams, I will need to find the specs, they are ELGIN, welded and custom grinds, proprietary grind over .500 lift, over 300 degrees seat to seat duration. Pistons are Wiseco
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11-06-2008, 04:44 PM
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3.7 runs unleaded Sunoco GTplus 104 unleaded
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11-06-2008, 04:45 PM
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Oh, 2.9 compression is 13:1
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11-06-2008, 04:45 PM
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Join Date: May 2002
Location: Kingston, NY
Posts: 75
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Quote:
I have had experience with the CMW heads and I would not use them for paperweights. They machining is some of the worst I've seen and unfinished to the point that the sharp edges cut my fingers. The bigger is better philosophy that CMW uses (port size and valve diameter) is old school and does not work as well as newer technology available. I have flow bench data for flow and velocity on the heads as well as some dyno work. Not worth the money. |
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11-07-2008, 06:04 AM
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Cmw
Well this is why they make chocolate and vanilla, right?
I only use CMW for the Piston domes, the heads are Porsche 3.0 worked in-house for plugs and valves. I have heard their heads are sharp out of the box, which is not good. My 964 cams are not stock profile, just use them as a base for custom. My current cam profile does not come in until 6800, I need to search for the lobe specs. |
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11-07-2008, 06:23 AM
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Ugly Betty
1980 Porsche 911SC
Red Dragon
908ster
