Since they are CNC machined, I would *think* that they are neutral balanced if you took off the weight. I would spend the $40 at the machine shop just to make sure, though.

 

That is pretty much what the instructions say. I think I'll just take off the weights and put it on.

 

Is it true that a radical cam isn't as streetable with an aluminum flywheel? I just heard that is another "con" as far as aluminum flywheels are concerned.

 

I think it's pretty much a given that the more radical you go with a cam, the less streetable the entire package will become. Radical cams give up low speed torque in favor of higher RPM power. When you couple the cam with a lightweight flywheel that gives up angular momentum, the combination of less engine torque and less angular momentum means you will most likely have to get quite skilled with adding throttle and slipping the clutch in order to keep from bogging and stalling from the stoplight. Now add in a nice, grabby high performance clutch to the mix, and you may find that sedate launches from a stoplight (esp. in front of a cop) are rather elusive. Add some rain, some heavy traffic, and a left-hand turn onto a busy highway, and you might find that the package no longer feels "streetable".

The level of perceived streetability is all relative from one person to another. Personally, I found a SPEC stage II clutch, A Fidanza aluminum flywheel, and a (rather aggresive) Comp XE262 cam in my Feeble305 was just fine. It was also okay behind my Minirammed 385 with the 230/236 cam. I now have a stage 3 clutch in there now but I haven't yet driven it to tell you if it's pushed the car past what I'd call "streetable".

 

Ok good to know, this'll be going with a McLeod single disc clutch behind my ZZ4 for now. I have a nasty set of heads that are going to go on soon with a Comp 280XFI and 1.65rr (comes to 230/236 .596/.591 113 LSA) and I want to make sure I'm not setting myself up for failure. I guess my definition of streetable is having enough vacuum to operate the brakes and a steady idle. Someone was trying to tell me that aluminum flywheels can make the idle erratic, that was my main concern. Enough seat time and you should be able to "streetably" (i.e. not getting pulled over for "racing" from a stoplight because you accidently peeled out) drive a fairly aggresive setup IMO.

 

For what it's worth, Last fall I drove that flywheel, the 230/236 cam and the clutch through the Woodward Dream cruise. It was over FOUR hours of constant idling and clutching to do a round trip of 22 miles. We left at one PM and didnt make it back to the parking lot until five PM. I didnt once turn off the engine. In fact, the only failure was my left leg: I got shin splints from all that clutching. The engine ran GREAT, idled great, never once puked or otherwise overheated. Three hours after that thrash in idling traffic, I put it on the Livernois portable dyno on the corner of eleven mile and Woodward and pulled 396 RWHP in front of 150 people.

 

Great, that is what I want to hear! Some guys were making it sound like the aluminum flywheel would make the idle vary between 800-900 instead of holding steady at 850.

 

Looks like we were wrong. I removed the weights and installed it, and it vibrates like a 9.2 earthquake. I guess I'll buy another one and leave the weights on, I think it comes zero balanced and you drill the holes in the weight for an external balanced car.

 

i noticed on the other flywheel that was netural balanced there still was the weight just a lil drilled.........deff sucks to have to do the jon twice

 

You should have been in the car when I went WOT............I thought my steering wheel was going to disentegrate.

 

"Is it true that a radical cam isn't as streetable with an aluminum flywheel? I just heard that is another "con" as far as aluminum flywheels are concerned."

i can give some insight on this.

i'd say that with a bigger cam the light flywheel becomes much more touchy in traffic and when trying to launch "gingerly"

granted i have a solid disc clutch which has VERY little slip. so that compounds the problem.

 

Not to mention pay for 2 of the same flywheel.........

 

Well after a week of DD the aluminum flywheel I'll say that it has absolutely NO effect on "streetability".