BT20V auto to manual conversion - 212mm ST20V Flywheel?

[Futo_gt86]

Car - AE71

motor / part in question - 212mm Silvertop manual flywheel

problem - Blacktop Engine auto flexplate

occurs/started when (if applicable)- weight difference

personal situation (if applicable)-

Hi all, searched, but couldn't find anything relevant.

I bought a Blacktop 20V engine, its Auto.
I have a 212mm Silvertop manual flywheel with brand new brass button clutch and beefed up pressure plate ready to bolt up.
I was researching and realized that the Blacktop 212mm flywheels were factory light weight.

Am I going to throw off the harmonics by using the Silvertop setup?

What was the auto ecu rev limit?

I was thinking about it (and praying), being auto, would the flexplate and bulky torque convertor weight more than the Silvertop stock flywheel...and therefor I can use my setup and keep rev limit at 8000rpm (adjustable aftermarket ecu)?

So yeah, all thoughts, opinions and experience with this type a thing would be much appreciated.
Thanks,
Ali

[Matt]

It'll be perfectly fine and I've used a Bigport flywheel on a 20v before on a stock ecu. Make sure you buy new flywheel bolts though as the auto ones are significantly shorter and will cause you problems if you use them on the manual flywheel.

The auto rev limit is 8200 , if you find a 6speed manual ecu the rev limit is 8400. I put a few youtube videos up a while ago where it videos me hitting limiter in my FWD 20v's. One is an ae101 and the other is the ae92.

The difference in flywheel weight is the removal of the excess material from outside of the clutch surface as shown in the picture below.

http://www.my-acoustic.com/Car/weight_issues/compare_20v_flywheel_weight/20v_flywheel.jpg

The weight difference can also be seen here http://www.my-acoustic.com/Car/weight_issues/compare_20v_flywheel_weight/compare_20v_flywheels_weight.htm

[Hen may possibly be a nut]

I've never heard of any drama s changing flywheels. Yes a lighter flywheel is generally better, and if it was an all-out build then it would be nice to dynamically balance the rotating assembly including the flywheel. But I wouldn't hesitate to bolt what you have together and rev it to the moon.

[Futo_gt86]

Too the moon and back!
Thanks Hen

[Futo_gt86]

It'll be perfectly fine and I've used a Bigport flywheel on a 20v before on a stock ecu. Make sure you buy new flywheel bolts though as the auto ones are significantly shorter and will cause you problems if you use them on the manual flywheel.

The auto rev limit is 8200 , if you find a 6speed manual ecu the rev limit is 8400. I put a few youtube videos up a while ago where it videos me hitting limiter in my FWD 20v's. One is an ae101 and the other is the ae92.

The difference in flywheel weight is the removal of the excess material from outside of the clutch surface as shown in the picture below.

http://www.my-acoustic.com/Car/weight_issues/compare_20v_flywheel_weight/20v_flywheel.jpg

The weight difference can also be seen here http://www.my-acoustic.com/Car/weight_issues/compare_20v_flywheel_weight/compare_20v_flywheels_weight.htm

Is there any truth in the old rumor about ARP 4age flywheel bolts bottoming out in crank and not torquing up right and then snapping?
I read some older archived posts about this on this site, got me scared...Clutch store sold me ARP, told me to check it and if so take off 2 threads.

[Matt]

I used arp on a build recently and didn't have a problem, put them in finger tight first and it should seal against the flywheel without a gap. If the case then torque to the ARP specs not factory.