[Holeshot71]

Not knowing the weight differences between the two transmissions, could it be that the TKX is heavier than the Muncie and maybe the car just feels different due to the weight? Or maybe different harmonics are at play here?

[HWYSTR455]

I provide flywheel & PP for balancing as SOP, as well as truing the face. Never trust anything 'new' and always have it checked.

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[mgarblik]

Originally Posted by HWYSTR455

I provide flywheel & PP for balancing as SOP, as well as truing the face. Never trust anything 'new' and always have it checked.

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That is a wise practice indeed. As a point of reference, we rarely have a "balanced assembly" that is absolutely spot on vs our crankshaft balancer. We run our calibration arbor on the machine regularly. An AMC 401 we balanced recently was out 23 grams with the flex plate attached. We added a 5 gram weight welded near the existing weight on the outside edge of flex plate to dial that one in. We had a 400 Pontiac Eagle stroker kit crankshaft out around 30 grams on the front and 25 on the rear. That is typical. Had a Scat forged crank for a big Ford engine out 230 grams out on the front and 80 on the rear. Found out that one needed a "hatchet weight" added to the front and some weight added to the rear. (it did not come balanced). The only crankshafts we see that never seem to need any attention are the forged Honda crankshafts. They are dead nuts perfect every time. (factory forged).

[HWYSTR455]

Yes, I provide flexplates for balancing too. Even the SFI neutral ones, to be at least checked.

I provide balancers too, to be checked, though the SFI neutral ones are usually very good.

Not much you can do about converters, if they are way out, about the only thing you can do is replace them. 'Race' converters are usually very close to neutral, more so than 'street' ones.



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[HWYSTR455]

Don't overlook pulleys, and I nowadays only use the RARE billet ones, if not serp conversions.

I chased a vibration one time for a couple years, and for other reasons swapped the pulleys. A few months of driving and finally noticed the vibration was gone. Only thing that changed was the pulleys.

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[scott70]

Originally Posted by HWYSTR455

Don't overlook pulleys, and I nowadays only use the RARE billet ones, if not serp conversions.

I chased a vibration one time for a couple years, and for other reasons swapped the pulleys. A few months of driving and finally noticed the vibration was gone. Only thing that changed was the pulleys.

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Luckily I hadn’t changed anything other than flywheel, clutch and transmission. I’m going to attempt to remove weight today… it’s a little tight in there and he might of used red light,, who knows

[scott70]

Just what I figured… must be red loctited in. I guess I could try to put some heat to it. That weight is aluminum and if you look close I can see where they cut on it to probably get the weight they wanted. I can see cut marks on the edge.

[scott70]

Well I got the weight off. At start up it kinda felt the same but driving it I could tell the steering wheel didn’t have the buzz in it anymore. Tried 5000 rpm and 80 mph and it felt good. Also switched the Speedo gear from a 17 tooth white to a 18 tooth yellow gear and now the Speedo is dead nuts on the gps so it feels like some progress. Guess I could try this thinner weight that came with the clutch… so it would be this thin aluminum and the 2 screws that hold it on…. Or just leave it? They are both like 1/4” thick.

[Scarebird]

The screws may actually be heavier than that aluminum weight.

[mgarblik]

I am glad you felt a difference removing the weight and it actually improved. It would be very interesting if you had an accurate grams scale to weigh all this stuff. If you have access, weigh the screws each 1. Also each of the 2 weights you have. Now add it all up. Very hard to guess at this stuff, but I am going to just throw some numbers out there to explain the process. Lets say the screws are 5 grams each. The small weight is 20 grams and the big one is 40 grams. So when you started you had 50 grams on the flywheel. Now you have zero and it's better. I would add 1 screw and drive it. If better, add the second screw. If the same, add the second screw. If worse, remove the screw and your done. Drive with 2 screws. If better again, add the small weight. If worse, take one screw out, and your done. If the same, add the small weight. You can see the process. You keep adding a little weight until it gets worse again, then go back 1 step. Trial and error process.

For safety, I would NOT test it with 1 screw holding a weight in place. Good chance it will come loose and could do significant damage if it comes off at 5000 RPM's. Good luck with it. Your on the right track.

[scott70]

Originally Posted by mgarblik

I am glad you felt a difference removing the weight and it actually improved. It would be very interesting if you had an accurate grams scale to weigh all this stuff. If you have access, weigh the screws each 1. Also each of the 2 weights you have. Now add it all up. Very hard to guess at this stuff, but I am going to just throw some numbers out there to explain the process. Lets say the screws are 5 grams each. The small weight is 20 grams and the big one is 40 grams. So when you started you had 50 grams on the flywheel. Now you have zero and it's better. I would add 1 screw and drive it. If better, add the second screw. If the same, add the second screw. If worse, remove the screw and your done. Drive with 2 screws. If better again, add the small weight. If worse, take one screw out, and your done. If the same, add the small weight. You can see the process. You keep adding a little weight until it gets worse again, then go back 1 step. Trial and error process.

For safety, I would NOT test it with 1 screw holding a weight in place. Good chance it will come loose and could do significant damage if it comes off at 5000 RPM's. Good luck with it. Your on the right track.

I’ll try that tomorrow. I can go to the hardware store also and pick up a scale,,, just for reference sake.

[scott70]

Haven’t had time to do any testing today but the screws are 6 grams a piece and the weight is 37 for a total of 49-50 grams. The extra horseshoe shaped one is 9 grams . Now off to some deer hunting

[mgarblik]

Originally Posted by scott70

Haven’t had time to do any testing today but the screws are 6 grams a piece and the weight is 37 for a total of 49-50 grams. The extra horseshoe shaped one is 9 grams . Now off to some deer hunting

Fantastic! My guess wasn't too far off. Now you know exactly what your dealing with. Time to "tune it in".