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Thread: Lightweight Flywheel
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Uncle-Jim
Revvin Up
Posts: 64
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posted April 16, 2002 08:17 AM |
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Lightweight Flywheel
I'm interested to hear of any experiences with RB's lightw. steel flywheel in a truck. I'd appreciate both good and bad opinions. Would matching it with a better pressure plate and disc help?
I have one in my Rx-2, and love it, but this is a very light car.
Thanks, Jim
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Uncle Jim
72 Rx-2 Show Car; '77 REPU (250K & goin' strong) 2 - '76 Cosmo's
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Jeff20B
Moderator
Posts: 661
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posted April 16, 2002 03:48 PM |
 Edited By: Jeff20B on 16 Apr 2002 15:55 |
Your REPU is a '77 so it has the 3.90 diff gearing. This means a light steel flywheel may not be very easy to drive. On the other hand, if your diff is geared like a '74 (4.60) it is actually pretty usable. My friend got one on his '74 and has had great results. The good is quicker acceleration in 1st and 2nd, strong no-slip clutch (he needed a new one anyway), I can't think of any more. The bad is it's easier to stall, more vibrations, probably can't tow very well anymore (he hasn't tried towing anything yet). That's all the bad I can think of.
I'm in a unique position here. I've got a '74 REPU with a gutless 13B and the stock heavy 9 bolt flywheel. I'm most likely going to put this engine in my MG because it's diff is geared at 3.70! The oil pan etc all fit good too. If I do that, then I'll be removing the Cosmo's engine and puting it in my REPU because it doesn't seem to suffer from all the weirdnesses of my REPU's engine, though it seemed to smoke a bit when I had it running last (I will not spend tons of money getting my MG running. The costs need to be justified, but I won't know untill the MG is running/driving). The only catches are finding a good torquey engine for the Cosmo (it's an automatic) and deciding which type of flywheel to use on the Cosmo's engine to put into my REPU. It's already got the auto counterweight. Installing a light steel flywheel would be easy even without power tools (no need for a 54mm socket etc). But I got an REPU flywheel from the friend who installed a light steel flywheel on his '74 REPU. I already have the 215mm disk and pressure plate for the light steel flywheel (old stock parts from an RX-2), as well as an RX-7 225mm disk (same diameter as REPU, I think) and a his used REPU 9 bolt pressure plate. The only things I need to buy are a pilot bearing and seal. I'd also need to spend $300+ on the flywheel from racing beat if I decided to go that route. Hmm, $300 is more than I wanted to spend, especially if this old REPU flywheel still has some life left in it. It could always upgrade later.
By the way, you need to get the 215mm size parts to be compatible with your ribcase tranny bellhousing (that's what mazdatrix told me).
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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repuguru
Redlining
Posts: 319
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posted April 16, 2002 08:38 PM |
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I have towed cars with a lightweight steel flywheel with a 4.6 and the 3.9.
The 4.6 doesn't care.
The 3.9 is not a good match for a lightweight flywheel. In a truck anyway.
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jfaplanet
Redlining
Posts: 356
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posted April 16, 2002 08:46 PM |
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Stock Flywheel
I'm considering a 23# flywheel from an 81 RX-7 with matching clutch of course. Anyone got a good reason why I shouldn't try it. What have I got to loose. If it works I've got 2 more. If anyone is interested.
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74 REPU "Red"
74 REPU "Jethro" "TII"
74 RE-Courier vert
79 SA-SE(aka deathtrap)
79 SA-SE-FC (project
turbo)
http://home.bellsouth.net
/p/PWP-crgj
TN Forum:
http://tnrotary.10.forume
r.com/
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Jeff20B
Moderator
Posts: 661
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posted April 16, 2002 09:37 PM |
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You shouldn't use a stock 12A flywheel on a 13B.
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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wankel_dreams
Redlining
Posts: 293
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posted April 16, 2002 09:39 PM |
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whats the weight of a stock REPU flywheel?
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74 wankel panther
77 REPU
79 rx7
89 Vert
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repuguru
Redlining
Posts: 319
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posted April 17, 2002 05:11 AM |
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If you have your rotating group rebalanced you could run the 12a flywheel. If not you will have balance problems.
The stock REPU flywheel is somewhere around 35 lbs.
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Jeff20B
Moderator
Posts: 661
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posted April 17, 2002 03:06 PM |
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Yeah, it's similar in weight to the twin dizzy RX-2 12A flywheel. Really heavy (it worked fine in my MG though, and so should the REPU flywheel).
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'74 REPU
'76 Cosmo
'77 MG Midget 13B
'81 RX-7
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offline
1st Gear
Posts: 16
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posted June 18, 2002 02:54 AM |
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OEM weight on the rotor truck flywheel is 33 pounds, the heaviest of all rotor vehicles.
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