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  #31 (permalink)  
Old 07-11-2013, 08:41 AM
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I got the new TCI Flexplate in, and removed the old one. The old one was definitely warped. I'll take the blame for that. Anyways, the new Flexplate seems much stronger, so I'll take it as an upgrade. And the new converter; 400 rpm higher stall to help with the cam, and the bolts are threaded into this converter, instead of using nuts like the last one. Should be a huge improvement. Also found the vac line for the TH350 trans had a huge hole in it Might run a lot better when I fix that too





Here is video of the new setup in action. Seems a little wobbly to me, but I guess I'll take it (?)




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  #32 (permalink)  
Old 07-12-2013, 10:25 AM
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Flexplate shimming

Hello Stratt134,

I watched your video of the flexplate movement many times; you stated that the flexplate seems to be "wobbly".

I believe the problem relates to a lack of shims between the flexplate and crankshaft, resulting in twisting or warping your flexplate.

From your pictures I observed the following-you can tell me if they are incorrect.

1. Your first picture shows a 168 tooth flexplate, #399273 which appears to be the correct according to TCI site.
2. Picture 2 suggests your Eagle crank is 2 piece rear seal, judging from the counterweight flange at approximately 6 o'clock.
3. Pictures 1 and 2 appear to show that the flexplate section which bolts to the crank is recessed, probably .030" to .060"
4. Assuming there is a recessed area between the flexplate and crank, the flexplate will touch the crank counterweight first and will not sit squarely on the flange which will make the flexplate "wobbly".
5.In addition the bolts will not secure the flexplate to the crank due to a lack of mating service. If the flexplate is not bolted "flat" you will experience loose bolts, cracked centers and broken starters.
6. If the flexplate is not "true", it will not attach correctly/flush to the converter either.

I believe you need to add shims between the crank and flexplate as shown here:
Chevrolet Flexplate Shim - TCIŽ Auto

I can't comment on whether the starter itself is an issue. You will have to determine if it is properly attached, bolted and braced.

Looking forward to your response.
Regards,
Meldrum
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  #33 (permalink)  
Old 07-12-2013, 12:14 PM
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Meldrum,

AWESOME info, thank you very much. I will definitely check to see if the flexplate is hitting the counterweight on the crank. If so, I will shim accordingly.

Thanks again for the advice, very much appreciated
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Old 07-12-2013, 02:23 PM
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I will point out that for many years on automatic type fly wheels there is one hole that is small OE size, then the 2 others are larger.

This was done so the R&R guy could bolt down tight the small hole bolt to the converter, then rotate the engine and install bolts , then tighten them as he went... suppose to save time.
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Old 07-12-2013, 04:38 PM
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That starter sure looks like it's moving... More so on the inside bolt..
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  #36 (permalink)  
Old 07-13-2013, 08:09 AM
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Quote:
Originally Posted by meldrum View Post
I believe the problem relates to a lack of shims between the flexplate and crankshaft, resulting in twisting or warping your flexplate.

Yes, TCI 399273 flexplate. Question - the old eagle crank had the large counterweight on it; the new one does not - will that be an issue? (I thought this was an "internally balanced" Eagle 383 stroker kit?) 1974 350 block, 2 piece rear main seal.

I looked last night and thought for sure it needed to be shimmed. Took a closer look this morning and I'm not so sure. Check out the pictures, and a new video with a better angle




Old Eagle flexplate:







new flexplate, TCI # 399273 pictures:









To me it looks like it is just barely hitting... probably need those shims - although, I like the idea of the larger mounting surface without the shims...

There's definitely a clearance difference between the new TCI flexplate, compared to the oil pattern on the old Eagle flexplate...

Thanks again for all the help
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  #37 (permalink)  
Old 07-13-2013, 08:35 AM
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Just my opinion you should not have to worry about smaller mounting surface with the shim because the converter bolts will support the outer edge and reduce or stop wobble after you install shim ,,even with only a light rub from balance weight you run the risk of damaging front pump in trans .Just my opinion. I would use the shim.
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