Lightened Flywheel

[RRoller123]

Well, my Spider has finally gone into my local shop to have the lightened flywheel installed (and a new clutch, etc. while in there). When I get it back I will report on my perceptions of the differences, as I know this is a popular topic here!

Pete

[cormac]

WTG Pete...any specs/info on lightened flywheel...who did it, weight, etc?

thanks

PS. and is your weather any better, my son in Hamilton, NY had his first day over freezing in a long long time , seems like months

[RRoller123]

Weather is slowly getting better, will be in mid 40's (F) for 5 days straight! In day 2 of the string now!

The flywheel is Mark's:

http://allisonsautomotive.com/products.html

I weighed the one from my second engine (an '81) a long time ago, but for the life of me I can't remember the actual weight. I am curious now so I will go weigh it again.

Pete

[KevAndAndi]

WTG Pete...any specs/info on lightened flywheel...who did it, weight, etc?

thanks

PS. and is your weather any better, my son in Hamilton, NY had his first day over freezing in a long long time , seems like months

Hamilton winters are brutal. I went to Colgate U. (Class of '83), and one January my normally-reliable Honda Accord failed to start during that entire month.

[srwilson]

From Mark's page, "...weighs only 8.5 lbs compared to 13.9 lbs for the stock flywheel". Almost a 5 1/2 pounds savings there.

[So Cal Mark]

the stock flywheel is heavier than the one we weighed. It turns out that one had been lightened already. The stock flywheel is up close to 19lbs

[RRoller123]

My memory says that my stock flywheel was 18.? pounds, so that makes sense! I will weigh it again when I get through the snow and find where the garage is.

[So Cal Mark]

you'll love the way the engine revs with the aluminum flywheel

[garion]

Hamilton, NY??

I went to school over the hill at SUNY Morrisville.. Went to Colgate for a few parties here and there.. Good times.

[srwilson]

you'll love the way the engine revs with the aluminum flywheel

Mark, I can see how it would make a big difference if out of gear but how noticeable a difference does it make as you're running through the gears?

Any 0 to 60 testing? If so, can you post the times?

Just curious what $399 gets ya besides 8.5 pounds.

Thanks!

[cormac]

Hamilton, NY??

I went to school over the hill at SUNY Morrisville.. Went to Colgate for a few parties here and there.. Good times.

A little off topic...

response to KevAndAndi and garion (don't tell my wife about the parties )

my son is a sophomore (class of 2017) at Colgate, just declared Comp science as major last week...goal is to have '76 Spider restomodded for graduation present

[RRoller123]

srwilson: Parasitic losses. Doesn't actively make any more HP or torque, of course, just reduces the parasitic losses. Engine will brake (not break) faster too.

For a simple thought experiment, imagine a 200 pound flywheel, and what it would do to the car's acceleration and deceleration. The reverse is true when weight is removed.

[So Cal Mark]

you'll notice much better acceleration in gear and I'll disagree with the "no hp" claim. My 500 picked up 9hp with the addition of the light flywheel and no other changes.

[RRoller123]

Key word "actively" meaning this mod doesn't effect CR, fuel rate, spark, cam timing, etc, etc, but yes a dyno would show more, due to less parasitic loss. Maybe the 2L would go from 103 something to about 113 or more? (+10%)?

Pete

[srwilson]

Well Pete, I'm interested in your impressions when you get it back and have had a chance to give it a go.
Keep us informed!