I just bought an F1 Racing 11.7 lb CroMo flywheel - Miata Turbo Forum - Boost cars, acquire cats.

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Old 01-25-2010, 06:57 PM   #1
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Default I just bought an F1 Racing 11.7 lb CroMo flywheel

I'll be the guinea pig.
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Old 01-25-2010, 07:25 PM   #2
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awesome. price?
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Old 01-25-2010, 07:31 PM   #3
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I see it at 195 shipped from ebay. Let us know how it holds up.
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Old 01-25-2010, 07:43 PM   #4
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I'm thinking about the 8.8 XTD here shortly. Hopefully yours holds good
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Old 01-25-2010, 08:05 PM   #5
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I already ordered the 9.9 lb one and have been testing it around the neighborhood this week. It will get abused at MSR-H next weekend. I'll post up the results, but so far so good...ubber light for under $200.
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Old 01-25-2010, 08:07 PM   #6
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Good to hear. Which brand did you go with jacob?
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Old 01-25-2010, 08:25 PM   #7
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Lol. I ordered the 9lb XTD prolite for 1.6ls today.

I'll let people now how it works in a few months

Oh and it was for sale on ebay for 189 + 14shipped. Offered them 170 and a few minutes later I paid for it for 184 to our door.
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Old 01-25-2010, 08:51 PM   #8
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Some of the flywheels will have the wrong thread 8x1.25mm instead of 8x1.0mm for the bolts that hold the pressure plate down. Just go to the hardware store and pick up new bolts. I would use some medium strength loctite too and possibly lockwashers if the factory uses em too.
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Old 01-26-2010, 01:37 AM   #9
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Quote:
Originally Posted by JasonC SBB View Post
Some of the flywheels will have the wrong thread 8x1.25mm instead of 8x1.0mm for the bolts that hold the pressure plate down. Just go to the hardware store and pick up new bolts. I would use some medium strength loctite too and possibly lockwashers if the factory uses em too.
I'd suggest being a little careful about picking up pressure plate bolts at the hardware store. Grade 8 bolts are typically used in inch sizes for clutches and flywheels in high performance applications. Metric grade 8.8 is well BELOW inch grade 8 in strength (116K psi vs. 150K psi tensile strength). A metric 10.9 grade bolt has slightly higher tensile and yield strength than a inch grade 8 bolt. No problem if your hardware store stocks 10.9 grade metric bolts but please don't risk grenading your pressure plate through your aluminum bell housing using run of the mill ungraded metric bolts to hold things together at 7,000 rpm.
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Old 01-26-2010, 10:27 AM   #10
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And I thought I had done well by reducing my stocker to 16lbs....need to make one out of aluminium now.
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Old 01-26-2010, 10:55 AM   #11
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I'd suggest being a little careful about picking up pressure plate bolts at the hardware store...
I don't think the pp bolts are actually that high of grade hardware- they only torque to 20ftlbs. and only need to manage the torque force of the springs and pedal/slave. Maybe you're thinking of the flywheel bolts? I know the bolts that came with my aluminum fidanza flywheel were nothing exceptional.
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Old 01-26-2010, 11:27 AM   #12
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I have a friend telling me to get everything balanced if I get that flywheel. Anyone have any trouble without getting theirs balanced?
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Old 01-26-2010, 11:32 AM   #13
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I'd definitely put a machinist's straight edge on it before installing.
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Old 01-27-2010, 12:01 AM   #14
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I have a friend telling me to get everything balanced if I get that flywheel. Anyone have any trouble without getting theirs balanced?
The 1.6 and 1.8 Miata motors are internally balanced, which means the flywheel assembly (flywheel, pressure plate, friction disk) and the dampener are neutral balanced. In "theory", one should have the flywheel assembly neutral balanced as a unit when replacing/swapping parts. I'm kind of struggling with whether or not I should do this when I replace my 1.6 assembly with a 1.8 stock flywheel and an ACT clutch setup. I think I can get away without doing it (stock flywheel and ACT clutch "should" both be neutral balanced) but I'll probably price out the balancing too. I'd really hate to get everything buttoned back up and then discover some "new" engine/driveline vibration.
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Old 01-27-2010, 10:23 AM   #15
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Oh ok. I didn't know that
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Old 01-27-2010, 12:53 PM   #16
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Lol. I ordered the 9lb XTD prolite for 1.6ls today.

I'll let people now how it works in a few months

Oh and it was for sale on ebay for 189 + 14shipped. Offered them 170 and a few minutes later I paid for it for 184 to our door.
Ordered the same one.
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Old 01-27-2010, 04:57 PM   #17
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Just ordered my XTD pro lite $189 shipped
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Old 01-28-2010, 10:04 PM   #18
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Xtd prolite ftw! I'm rocking it. Cromo is cromo.
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Old 02-01-2010, 09:12 PM   #19
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Just got my XTD prolite in. Looks great. Checked one of the old clutch to flywheel bolts and it threads in with 0 issues. The thread issue mentioned above as a possibility... they wouldn't thread into each other right? Having a brain fart moment.
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Old 02-01-2010, 10:56 PM   #20
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Any updates on guys that have been running it?
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