Flywheel pin information for KH motor

Wed Aug 6 15:40:55 EDT 2003

Yes I understand that every bit of inertia robs torque during acceralation.  I have never driven a turbo motor with lightened flywheels so you are correct I am working on theory in that regard. I have driven wild NA cars with aluminum flywheels and multi-disk small diameter clutches.  One accelerated so quick you had to leave your hand on the shift lever until you were in 3rd gear or you would slam the 9000 rpm readline.  VERY fun, but I think I would last about 1 day before I was in jail with that particular car.

My point with the street turbo is the extra inertia of a stock flywheel, although not idea, does have a nice side effect of spooling the turbo faster.  I am curious to those 4kqt owners out there with lightened flywheels.  From a rolling start of say 1500 rpm do you build full boost in first gear?  Javad I may be way off base as the wieght of the car may still be plenty to build boost with the low gears.  The 4kq is a lot heavier than other things I have built in the past.

I do agree the JT flywheel certainly is a pig though.  Todd I got the same weight when I measured the flywheel.  I got another 13 lbs for the clutch and flywheel (on my $6 bathroom scale).  Worst of all a lot of the wieght is at the rim.  Worst of all my crank rang up at 60 lbs.

Back on the original topic does anyone have ideas on the diameter of the pin?  Luke said about 3/4" long.  I think I will just use what I have available for diameter since the sensor is just looking for a transient.  I just don't have any 5k parts to reference.

Thanks
Eric

-------Original Message-------
>
> Eric, I agree with Todd, unless you've ever driven a car with a "lightened"
flywheel, it will be tough to determine this on theory alone, its not a
black and white issue, and there is much to be gained by removing a
reasonable amount of weight (from the right area) from a very heavy stock flywheel.

Javad

>Eric,
>  Sounds like you thought it through.  Thats good.  Go with your
>plan then.  I agree partially with you but I feel the early 10vt
>flywheels are EXCESIVELY heavy.  The 91' 200 flat flywheel is
>about 10+ lbs lighter but still a very heavy flywheel with more
>than enough mass for the turbo application.  I've driven a few
>cars with that flywheel "including an MC in an UR-Q" and think
>that it makes the throttle response much better and makes the
>car a tad more responsive. The Balanced and Blueprinted 10vt
>that I drove feels almost like a 20vt except it still runs out
>of breath at about 6000 rpm unlike hte 20vt.
>  Anyhow, just thought I'd bring that up.  The JT flywheel I
>believe falls somewhere in between the two anyhow so that will
>help some.  I believe its
>  MC-2/3B Flywheel - 18lbs
>  4kq/jt  Flywheel - 24lbs
>  5ktq/mc Flywheel - 29 lbs.
>I did sucsessfully lighten a 4kq flywheel to about 20lbs once
>before balancing.  After Balancing it would have been a little
>less.  Just an FYI for anyone curious.
>  Good luck Eric, I love my KH 4ktq.
>
>l8r
>   Todd
>   FS: 84' 4ktq KH motor, new paint (NOT MAACO)  Selling to make
>way for a 20vt ur-q.
>
>--- Eric <eric_audi.ql at mindspring.com> wrote:
>> I guess I differ in my opinion than most people here in
>> regards to light flywheels.  I think they are the way to go
>> hands down on a NA car or a race turbo, but I don't agree for
>> a street turbo.  Load is what spools a turbo and with the 4k
>> the gearing is already working against you in low gears (tall
>> gearing spools turbos faster also).
>>
>> Anyway I have a SPEC Stage II clutch good for 360 lb-ft and it
>> was far cheaper than getting a used 240 mm flywheel and sachs
>> clutch kit.
>>
>> -Eric
>>
>>
>> -------Original Message-------
>> From: Todd Phenneger <tquattroguy at yahoo.com>
>> Sent: 08/06/03 12:10 AM
>> To: Eric <eric_audi.ql at mindspring.com>, quattro at audifans.com
>> Subject: Re: Flywheel pin information for KH motor
>>
>> >
>> > Why not ditch it and get a 91' 200 flat face flywheel,
>> balance
>> it to match the motor.  ITs lighter and much stronger.  Not to
>> mention correct.  ITs also the same flywheel used on some
>> later
>> MC-2 motors.
>> l8r
>>   Todd
>>
>> --- Eric <eric_audi.ql at mindspring.com> wrote:
>> > I am using a JT flywheel in my KH conversion.  I know the
>> > location of
>> > the pin (I think), but I don't have a 5k to reference for
>> size
>> > and
>> > length of pin.  I would imagine the diameter would not be
>> > hugely
>> > important, but length might be.
>> >
>> > By the way if anyone has tried to email me in the last week
>> or
>> > so I was
>> > having trouble with email and did not get it.
>> >
>> > A big thanks in advance.
>> >
>> > Eric Sanborn
>> > '85 4kq in the middle of KH conversion
>> > http://www.mindspring.com/~robinsanborn/4000/
>> >
>>
>>
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