Firedrake

Just curious if anyone has either of these and any opinions? Any fitment issues? From what I've heard, Aasco's are the best aluminum flywheels......but the JUN is chromoly (spelling?) steel so it doesn't need a surface and *supposedly* is better than an aluminum flywheel.......All the flywheels I've ever dealt with have been clutchmasters aluminum, and I've never had any problems with them (except with trying to get a new replacement surface.....grrrrrr clutchmasters)....
Thanks!
Brian

Nick M

I have an Aasco in my H22a. I love it. There is nothing wrong with an aluminum flywheel. There was a good thread about aluminum vs. chromoly in the ITR forum.

Firedrake

Good to hear! I had planned to get the aasco, but thought I'd post on here first just in case there were fitment issues or something else...
Brian

Nick M

Works fine

Good luck.

jbontke

One thing about aluminum is that it contorts its shape under heat. Basically when it gets hot it expands more than steel. Also aluminum is weaker than steel. Some aluminum flywheels have lost their flat surface under heat expansion. Yes they have steel inserts but the aluminum is the backbone to the steel insert. So if the aluminum decides to contort the insert will also contort. This could leave you with a not completely flat surface and you would loose surface area contact for the clutch disc thus clutch slipage. This is one reason I have decided to go with chromoly steel. It is rigid.

Nick M

Is this hearsay or have u had an experience like this? Ive never heard of an aluminum flywheel contorting. Atleast not on this board. I do hear this theory alot though. Alot of all-motor guys use aluminum and with 8krpm clutch drops they seem to hold up fine.

jbontke

I have haven't personally had this experience, but a close friend of mine has. It was with a 1991 Mazda RX7 turbo. It started with the a centerforce dual friction clutch slipping on launches. He thought it was the clutch because the the same clutch failed me on my 1993 RX7. The flywheel was resurfaced. The guy who did it said he took off a good bit but there was plenty left for more resurfacing. WE figured that was correct because the clutch slipped and wore out the surface from heat. So then went in the ACT clutch with organic disc. Few months went by and back to the same old slipping. He called ACT pissed and ended up getting a sprung 6 puck clutch disc. Same thing with resurfacing the flywheel. 4 months pass and the same problem occurs. AFter talking with Ari Yallon of Rotary Performance, He suggested the idea. He had 2 aluminum units do the same with a couple of his customers. HE replaced them with chrom molly units and hasn't had a problem since. So the aluminum was replaced with chrom moly and no troubles since. THe RX7 had a street port, garret T-60-1, and NX to spool the turbo off the line. WIth dragradials it ran 121@11.73 with 2.0 sixty-foot times. I am a believer because of that. In my opinion, a daily driver might be fine with one, but a drag racer/autoXer ought to get a chrom moly for the extra abuse. For me I won't settle for nothing but the best, chromoly all the way. HOw exactly do you spell chrom moly?

dplatt

Aasco flywheels are VERY nice. No problems with any of them that I've installed. But the JUN is a really nice piece as well. Can't go wrong with either flywheel.

Firedrake

There is a pic of mine Haven't tried it out yet though, still need to put in the motor mounts and bolt the tranny back on.....
Only problem I had was the little alignment "nub" was slightly too big for the little hole on the flywheel, so I had to drill it a little....it was like 1/100 too small....
Brian

Firedrake

WHOA!!!....
I just noticed something........shouldn't there be a little bearing or something in the middle of my flywheel (like in the pic above?) because it didn't come with one......


Hmmmm.....now I'm perplexed.....anyone got some ideas??
Brian

Firedrake

Damn I'm an idiot!
I guess I need to go get one of those bearings from a honda? dealer
That's what I get for installing parts at like 3am
Brian

99_SH

The bearing you are reffering to is called a Pilot Bearing, and it sits in the middle of the flywheel. Most flywheels do not come with this bearing, and the stock one doesn't come with it either. The only manufacturer that supplies this bearing is Fidanza(and they only did so in their new design flywheel). So its nothing to worry about. But i'd call the manufactuer to make sure.

89civicdx

I have a JUN ultra light in my civ...its a very nice piece and I've had it for 4 years with no probs BUT if I ever buy another lightweight flywheel it will be an aluminum one. This is because not your average machine shop can't resurface chromoly and machine shops usually want more to grind chromoly. Also the fact that the alumium flywheels have replaceable friction surfaces should give them a greater lifespan.

Bontke

I believe that the flywheel you choose should depend on what kind of abuse you plan to put it through.

cybercrx00

I have a JUN ultralight in my CRX, never had a problem, it was sweet. Maybe someday the prelude will get one.