Engine balancing

Discussion and technical advice for 84-89 AW10 & AW11 MR2. 3A-LU, 4A-GE, 4A-GZE.

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SuperRedMR2
Posts: 5494
Joined: Mon May 16, 2005 8:40 pm
Location: Wickford, Essex

Engine balancing

Post by SuperRedMR2 »

Hi all,

What components are required for complete engine balancing?

Does anyone ever balance the top end as well?

Cheers
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Lauren
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Re: Engine balancing

Post by Lauren »

The whole rotating assembly is balanced, which comprises, the flywheel, crank, rods and pistons.

You don't balance the top end, as there is no point in balancing camshafts.
2020 GR Yaris - Circuit Pack :lover:
aw11rally
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Joined: Wed Dec 31, 2008 12:46 am

Re: Engine balancing

Post by aw11rally »

Probably worth either balancing or replacing (with a lighter one) the crank pulley while you're at it.
SuperRedMR2
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Joined: Mon May 16, 2005 8:40 pm
Location: Wickford, Essex

Re: Engine balancing

Post by SuperRedMR2 »

I've had a lightened one before, didn't do me any favours and it was missing the harmonic balancer.

Going to stick to the standard crank pulley.
aw11rally
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Re: Engine balancing

Post by aw11rally »

Do you want to sell the alloy one?

What problems did it cause?
boondougal
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Location: Shavington (near Crewe)

Re: Engine balancing

Post by boondougal »

SuperRedMR2 wrote:I've had a lightened one before, didn't do me any favours and it was missing the harmonic balancer.

Going to stick to the standard crank pulley.


I have one of these alloy ones on my engine, i have a sneaky suspicion that once the car is actually on the road this pulley will be more trouble than its worth.
SuperRedMR2
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Location: Wickford, Essex

Re: Engine balancing

Post by SuperRedMR2 »

For starters when my cambelt snapped, I couldn't get it off.

The key slot wasn't particularly strong either.

It had basically melted to the end of the crank. It came off via a chisel which in turn damaged the end of my crank which I had to have sleeved.

It went in the bin ages ago. I thought it was a bargain for £75 with the alternator pulley, PAS AE86 pulley, water pump pulley and the crank. No, no it was not.
rev2rich
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Re: Engine balancing

Post by rev2rich »

jimi
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Re: Engine balancing

Post by jimi »

:roll:
Not much use for a 4A-GE :wink:
gon
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Re: Engine balancing

Post by gon »

you can (and should) also balance the clutch plate with the engine ...
Balance it without and then with .... on the second pass (with) material removal should only take place in the clutch plate
SuperRedMR2
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Joined: Mon May 16, 2005 8:40 pm
Location: Wickford, Essex

Re: Engine balancing

Post by SuperRedMR2 »

gon wrote:you can (and should) also balance the clutch plate with the engine ...
Balance it without and then with .... on the second pass (with) material removal should only take place in the clutch plate


I was going to do the clutch assembly as well :thumleft:
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