Thread: c.h.i.e.f 's 110 Isuzu county

I called a place called HB sales at islington the bloke there told me he would do it but when I asked how much I got the same old answer I get from everywhere (yeah mate we charge $140 an hour) I asked how long will it approx take ? The reply was "well it depends it could take ages or it could take little time at all we will have to have a look at it" they then proceeded to tell me that it is pointless balancing it without 1.having a crank to balance it to and 2.it needs to
be balanced to the individual crank,rods and pistons I then proceeded to ask "why can't the flywheel,pressure plate and inertia ring be staticly balanced as one ?" which will then mean that as a unit will be balanced to it's centre axis and asuming that the motor is already within its balance limits the addition of bolting that "balanced" arrangement to the crank shouldnt be a problem he then proceeded to inform me that the weights of the pistons will need to be checked etc etc (what instantly popped to mind was Dougal's investigations that found that one was around 17grams heavier from factory so couldnt be a real large concern) he then continued the conversation with "telling me about how any crank flexes otherwise they will crack I highly doubt this personally stress fatigue will cause failure and if the crank flexes there is the chance of metal to metal contact...he then told me that 3 grams unbalance at 3000rpm will be equal to 1ton out of balance ???? I'm thinking maybe putting up with the vibrations and try and not make them happen to often...

What a load of crap. So every time you change your clutch kit , you strip down your motor for balancing??

If someone can get us a crank, our guy up here will balance for us. We have had 2 balanced already with just a stub of a crank, but it's a PITA for him to set up.

Justin

Originally Posted by DRanged

What a load of crap. So every time you change your clutch kit , you strip down your motor for balancing??

If someone can get us a crank, our guy up here will balance for us. We have had 2 balanced already with just a stub of a crank, but it's a PITA for him to set up.

Justin

Exactly!!!! I have pointed out to everyone that comes over to see my progress (almost as fun as watching paint dry) that everything is perfectly machined then there is a thing called a pressure plate attached that is pressed and bolted together even though the pressure plate does have counter weights tacked to it for some balancing I highly doubt it will still be within 3grams as this bloke is suggesting...
So you know a bloke that may be able to help out hmmmm

Yep
The guy up here builds very nice race engines. In the past he has charged us around $150 to $ 250 but it would be more a fixed price with a crank as a jig.

So that goose you spoke with must strip his car down and balance everything when he fits new tyres??? What a Knob

Justin

Sounds like they just want to make the job as big as possible for their benefit.

Yes my motor was about 17g different from heaviest to lightest conrod, but that has to be an anomaly. There's no reason to suspect they were all that bad.
Kind of related, I've read recently from a Welsh engine tuner (and engineer) who when building race engines doesn't bother balancing the crank. He said that under power the cranks flex that much that balancing them spinning alone is pointless.
And I think I agree with him. Which means that for our engines the big improvements will be found in making sure conrods are the same weight and the flywheel is balanced. The crank probably isn't worth worrying about.

Just tell him you have a dynamic balance job on a flywheel only and ask if he wants the job.

I really should stop collecting cars and sort my own flywheel out.

HB Sales is the place. I assume you spoke to Bob.

I agree the flywheel should be balanced with the crank, etc. Then the pressure plate can be balanced seperately.

If the inertia ring is fully machined then it won't need balancing, providing it is centred properly on the flywheel.

Originally Posted by DRanged

Yep
The guy up here builds very nice race engines. In the past he has charged us around $150 to $ 250 but it would be more a fixed price with a crank as a jig.

So that goose you spoke with must strip his car down and balance everything when he fits new tyres??? What a Knob

Justin

Hahahaha yeeees

Originally Posted by Dougal

Sounds like they just want to make the job as big as possible for their benefit.

Yes my motor was about 17g different from heaviest to lightest conrod, but that has to be an anomaly. There's no reason to suspect they were all that bad.
Kind of related, I've read recently from a Welsh engine tuner (and engineer) who when building race engines doesn't bother balancing the crank. He said that under power the cranks flex that much that balancing them spinning alone is pointless.
And I think I agree with him. Which means that for our engines the big improvements will be found in making sure conrods are the same weight and the flywheel is balanced. The crank probably isn't worth worrying about.

Just tell him you have a dynamic balance job on a flywheel only and ask if he wants the job.

I really should stop collecting cars and sort my own flywheel out.

Thanks dougal any links to that article you were reading ? Yeah I suspect most motors will be out of weight in some areas which I can see the benefits in getting the motor blue printed i just suspect that the job is to hard for most places so they bypass the job at hand... You will now need to buy another 4bd1t to put in the new rangie rather than transferring everything over if I were you I'd turbo the new one just so you can run a blow off valve