With flywheel weight/clutch choices I always ask what the use/application will be. Street or track? On the track I would get the lightest in my budget. However,with a street car,I would suggest of not going lighter than10-12lbs for a flywheel.You do need some inertia for pulling away from a stop. At first you may say that you will adjust your driving style to deal with the ultra light FW, but over time it will become a royal PIA.I also stay away from multi-disc clutches on the street,especially carbon/carbon. They just don't like being slipped/modulated to the level needed for street driving . I guess it comes down to how much,where and how you will be driving the car when done.
FastIndyFiero
JUN 13, 03:15 PM
I got my aftermarket ring gear in several days ago. It's only about a 1/4" wide (ID-OD), so the ID is about .25" larger than the stock '85 Duke ring gear. This doesn't leave me enough room to pin or screw it onto the flexplate. I wanted something with a SMALLER ID than the stock gear, so I had enough room to at least get some #10 fasteners in. Without any additional shear holding, using a shrink fit, the ring gear would be able to slip on the aluminum center at my worst case accel-decel scenario.
Does anyone know of any smallish-ID 142 tooth ring gears?
In other news, I finally got my car moved to my shop
I don't know what to look for when it comes to the SD stuff, but maybe he has something of use to you for a part of your build!
852m4se
OCT 02, 05:09 PM
nice. i wanna here an sd-4. they probly sound mean
FieroMonkey
DEC 05, 07:28 PM
quote
Originally posted by 852m4se:
nice. i wanna here an sd-4. they probly sound mean
You can hear my SD4 in this video...as long as you can ignore the annoying commentary that is.
Jfrost
DEC 11, 02:06 PM
Never heard an SD4 before, sounds very interesting, almost as if it has a constant rod knock. Great looking Indy though, looks like its a lot of fun to drive!
FieroMonkey
DEC 12, 01:02 AM
Can't speak for every SD4 out there, but I have 2 and they both have that internal rattle to them. Both have Jessel rockers and I have been told that it could be those. However I have noticed that every stock Duke Fiero I have ever owned has sounded like a rattling bubblegum machine to varying degree's so it could just be an inherent noise with the design of the engine, which is pretty much the same between the SD4 and the duke.
When i first got the Indy it had a hooker header on it and a straight pipe exhaust with no muffler. You could not hear the rattle for obvious reasons with that set-up.
But there are ppl here more knowledgeable about SD4's here than I am who might be able to shed some light on this.
RWDPLZ
JAN 21, 12:47 AM
Anything new?
FastIndyFiero
JAN 31, 01:48 AM
Nothing exciting right now, I've been working on machining some assorted flanges, and I'm still trying to get a flywheel design ironed out that won't cost me an arm and a leg for raw material for. I've also been doing some things to the car, cutting/repairing rust around the battery tray. Money is tight right now, though, so nothing big.
Hoffedav
FEB 22, 07:14 PM
Just read through this entire thread for the first time. In the beginning I was getting excited for the dyno numbers and 1/4 mile runs I expected to be in the latter pages. Then once I saw the switch to the DOHC head I knew it wasn't done by page 14 lol.
