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Join Date: Feb 2004
Location: Summerland B.C Canada
Posts: 648
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Balance shaft delete on a street engine, bad idea?
I am in the process of rebuilding my friends '84 944 engine. I've heard about race engines with no balance shafts, would the extra vibrations shorten the life of the engine? How much harsher would it actually be?
Thanks Kevin
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'73 914 2.0L |
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04-17-2008, 05:52 PM
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Trying to work for parts!
Join Date: Oct 2006
Location: MO
Posts: 1,760
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You mean no balance shaft belt right? Your not going to try and remove the balance shafts are you?
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04-17-2008, 06:02 PM
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No belt would be the easiest, but i was thinking of removing the shafts completly and fabing up some block off plates....with no shafts I'm thinking I could have issues with oil pressure though, would I?
Thanks Kevin
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'73 914 2.0L |
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04-17-2008, 06:06 PM
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your girlfriend will love you for it...
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Kyle 2008 Mini Cooper // '83 Porsche 944 // '01 Mazda Protege [sold] // "Never break more than you fix!" - SoCal Driver |
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04-17-2008, 06:15 PM
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Why must we have these anyway**? What do other straight fours do about vibration. What other motors use them? I don't recall vw using them...nor do I recall their motors vibrating themselves apart.
**bitter cause balance shaft bearing failure destroyed my last engine.
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WARNING: Do not buy from Ron Kirby of Fort Thomas, KY (currently RRRacing1970). |
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04-17-2008, 09:53 PM
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Burn the fire.
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The engine doesn't vibrate itself apart on most other cars. They do certain things to dampen the vibrations as much as possible... such as softer engine mounts, weight the crank differently, dual-mass flywheels, etc.
Porsche licensed the balance-shaft technology from Mitsubishi. It was not necessary, but helpful when considering comfort for the driver and passengers. Recommended for a street car, optional for a track car.
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04-17-2008, 10:15 PM
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On second thought I'm just going to leave them, I was just trying to simplify the engine. It's probably more work than it's worth for no real gain, well except a harsher ride!!
Thanks for the info guys!! Kevin
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'73 914 2.0L |
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04-17-2008, 11:57 PM
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meister member
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worth 7 hp.
May cause vibration at a certain frequency which will decrease the fatigue life of components which would cause premature failure. Speedy 
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1983 944 guards red with 16" Fuchs, Host of Wisconsin area timing/ balance shaft belt tensioning party 1987 944S Purchased from Legion. Corvette LT-1 V-8 conversion with Mega Squirt II Check on progress ---> www.porschehybrids.com/gallery/speedracing944 Favorite Road = www.tailofthedragon.com 318 turns in 11 miles (11 min 20 sec best run) |
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04-18-2008, 12:39 AM
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Location: Slidell, LA
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Most four-bangers are smaller than the 944.
The 2.5L...going up to 2.7L and 3.0L are very big for 4-cylinder engines. The VWs go up to about 2.0 (maybe 2.1). Heavier pistons and rods and everything else that rotates cause more vibrations.
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"I Am The Stig!" MistahSinclair 1986 N/A Daily Driving Project! |
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04-18-2008, 03:14 AM
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2017 Victory Octane
2005 Dodge Ram 1500 SLT
