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Dane Brown's Avatar
 
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Balance shaft delete kit???

Anybody ever use this? good idea or bad idea? BALANCE SHAFT DELETE KIT at LINDSEY RACING - Your Porsche Performance Parts Center
Old 08-28-2012, 05:08 PM
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Somebody just recently posted about that. John_AZ said it was a very bad idea.
Old 08-28-2012, 05:37 PM
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Alright well i guess i just got my answer haha. thanks.
Old 08-28-2012, 05:41 PM
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I mean it would increase vibration and shake everything up until stuff cracked and failed
Old 08-28-2012, 05:50 PM
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My son - for an experiment - ran without a balance belt in an 84 NA for a couple weeks. He ended the experiment because it was clear the car would shake apart.

The balance shafts are there for a good reason.
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Old 08-28-2012, 07:45 PM
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To run without the balance shafts you need the full version of the engine not just the rh side

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Old 08-28-2012, 08:45 PM
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It depends what you are using the car for.

If you are just using it for street, there will be little to no benefits and you risk vibrating things loose.

If you are using the car for track use only, then it will probably be beneficial but there are some precautions you should take.

The bulk of the vibration occurs around 3-4k RPM (if I remember correctly), so in a track car you are probably above those RPM's most of the time anyway. BUT, it is still a VERY good idea to reinforce the two main problem areas that are caused by running no balance shafts.

1. Your oil pickup/return tubes that hang down into the oil pan will vibrate and eventually crack, causing loss of oil pressure, and eventually can crack off completely (causing major catastrophe). You can reinforce the oil tubes by adding a secondary support bracket between the two tubes, and also re-braising where the tube meets the flanges.

2. Your fuel rail will vibrate and can crack or tear from the mounting tabs. It is a good idea to braise around the rail where the tabs meet the square rail.

Aside from that, it is also a good idea to re-tighten and re-torque every nut and bolt, especially in the engine/drive train components as well as suspension and chassis.

If you do all of that, you can safely run no balance shafts!
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Old 08-28-2012, 08:49 PM
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harmonics can occur anywhere in the range. it all depends on the masses involved. lighten a flywheel and you change the harmonics, yada yada. there is a boatload of math involved in figuring out the harmonics.

any harmonic means power lost. basically when rotating components are essentially fighting each other, there is energy not transmitted to the final output. this often exceeds the frictional and parasitic losses of the items involved in countering the harmonics.

it's not so simple, and i have yet to see anybody document gains across the board, and almost always there has been a loss in some areas of the curve, in spite of any gain in other areas

and then there is the side effect of the uncancelled harmonics.......................
Old 08-28-2012, 08:58 PM
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Yeah I think ill stick to keeping the balance shafts in there haha. Way to much unnecessary work just to delete something that really should not be deleted. Thank you guys for the good info. I just kept seeing the balance shaft delete kit on Lindsey racing and thought I would just ask. My car vibrates so bad right now the way it is sounds like constant bass, sets car alarms off sometimes in between 1000 and 3500 RPMs very annoying.

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Old 08-29-2012, 12:25 AM
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A local race shop dyno'd a 944 engine with and withiout the balance shaft.

Gained torque at some rpms, lost torque at other rpms, ended up a wash as far as performance goes.

May as well keep the shaft spinning.
Old 08-29-2012, 02:36 PM
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Meh, who cares if you lose oil pressure if the engine compartment is on fire from a rail failure?
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Old 08-30-2012, 07:25 PM
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