Light steel or aluminum flywheel?
08-24-07, 12:36 PM
#1
Light steel or aluminum flywheel?
I've got an NA 20B. I've tried a Racing Beat light steel flywheel and it was pretty good. Is it worth while to get an aluminum flywheel? Or should I stick with steel because it's stronger and all that?
I heard people in Japan don't even bother with aluminum because of the strength issue.
I heard people in Japan don't even bother with aluminum because of the strength issue.
05-21-10, 12:19 AM
#2
Wow, no replies.
Never mind about the strength issue. It's NA so no real torque to worry about.
Ok, I went ahead and got a Racing Beat aluminum flywheel for '83-'92 NA (it matches my tranny). I weighed it just by itself. Looks like 7.5 pounds. I then weighed the RB light steel; 13 pounds.
The last time I had it running, was with the light steel flywheel, a stock Daikin 225mm disc and pressure plate setup. This combination felt really good to drive. No slip at all, but I didn't push it because the MegaSquirt was not tuned. The exhaust was undersized. The ports were all stock. Maybe about 150HP (but probably less). This is about to change.
The new setup will be gtorx7 inspired ports (huge), properly sized 3" exhaust, and an RB aluminum flywheel. The power goal is 300HP and 200 ft/lbs. The clutch goal is something that's driveable/pleasant on the street.
Which clutch disc and pressure plate should I use? I have several choices, all 225mm and some 215mm:
225mm Centerforce I or II
225mm RB street strip (Exedy)
225mm OEM Daikin (was used on 20B before and drove nicely but never tested its limits)
215mm Centerforce I or II pressure plate (currently in the '81 on the 13B and drives excellently)
215mm RB street strip
215mm OEM Daikin (I won't even try this lol can you imagine a 20B with a dinky stock 215mm?)
Also various clutch discs in both sizes:
ACT Performance - SS 225mm part# 3000203 (brand new, untested)
Daikin OEM 225mm (tested and drove beautifully)
Daikin OEM 215mm
no-name OEM 215mm (currently in the '81, love it!)
Never mind about the strength issue. It's NA so no real torque to worry about.
Ok, I went ahead and got a Racing Beat aluminum flywheel for '83-'92 NA (it matches my tranny). I weighed it just by itself. Looks like 7.5 pounds. I then weighed the RB light steel; 13 pounds.
The last time I had it running, was with the light steel flywheel, a stock Daikin 225mm disc and pressure plate setup. This combination felt really good to drive. No slip at all, but I didn't push it because the MegaSquirt was not tuned. The exhaust was undersized. The ports were all stock. Maybe about 150HP (but probably less). This is about to change.
The new setup will be gtorx7 inspired ports (huge), properly sized 3" exhaust, and an RB aluminum flywheel. The power goal is 300HP and 200 ft/lbs. The clutch goal is something that's driveable/pleasant on the street.
Which clutch disc and pressure plate should I use? I have several choices, all 225mm and some 215mm:
225mm Centerforce I or II
225mm RB street strip (Exedy)
225mm OEM Daikin (was used on 20B before and drove nicely but never tested its limits)
215mm Centerforce I or II pressure plate (currently in the '81 on the 13B and drives excellently)
215mm RB street strip
215mm OEM Daikin (I won't even try this lol can you imagine a 20B with a dinky stock 215mm?)
Also various clutch discs in both sizes:
ACT Performance - SS 225mm part# 3000203 (brand new, untested)
Daikin OEM 225mm (tested and drove beautifully)
Daikin OEM 215mm
no-name OEM 215mm (currently in the '81, love it!)
05-21-10, 12:52 AM
#3
Keep in mind the old setup was severly underpowered for a 20B. It couldn't break them loose in gear. Or should I say it couldn't break the right rear tire loose in gear (open diff) on a sub 2000 pound car. The OEM Dakin clutch setup held fine even during quick blasts up to 5k (tiny stock ports and tiny 2" exhaust).
I then aquired an Exedy RB street strip pressure plate (Daikin's performance division) from a friend who bought it from Mazdatrix. After that I got this ACT performance disc:
thinking it would hold the expected power.
It should hold the torque, according to this if the Exedy P-plate is anything like ACT's HD pressure plate.
268ft/lbs is more than enough capacity. But how does it drive? Especially with an aluminum flywheel?
I then aquired an Exedy RB street strip pressure plate (Daikin's performance division) from a friend who bought it from Mazdatrix. After that I got this ACT performance disc:
thinking it would hold the expected power.
It should hold the torque, according to this if the Exedy P-plate is anything like ACT's HD pressure plate.
268ft/lbs is more than enough capacity. But how does it drive? Especially with an aluminum flywheel?
