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This is the flywheel I bought for my TR3A. =C2=A0=0Ahttps://www.bpnorthwes=
t.com/alloy-light-flywheel-tr2-tr3-tr4-tr4a.html=0AI've had no issues kill=
ing the car when starting in 1st gear, it's still very forgiving. And yes,=
the engine spins up nice and quick powered with 87.5 big bore kit.=0A=0AR=
ye=0APH: 530-FIND-RYE=0A=0AOn Sep 11, 2018, at 05:23 AM, Randall <tr3drive=
r@ca.rr.com> wrote:=0A=0Ado they make a lighter flywheel? What about Alumi=
num?=0A=0AFidanza offers an alloy flywheel (with a replaceable steel inser=
t for the=0Afriction surface). =0A=0AI've been running one for perhaps 15 =
years now; and I like the overall=0Aeffect. Makes the car much more nimble=
at low speeds (mostly in 1st gear).=0A=0AHowever, it did have a very defi=
nite effect (for me) on launching the car=0A(initial acceleration from a s=
tandstill); behind two different engines. Not=0Ahard to cope with, but eve=
n after all these years I still have to think=0Aabout it to avoid killing =
the engine. And I still occasionally do kill it,=0Ausually when I'm just p=
uttering around and thinking about something else.=0A=0AAlso, it is delibe=
rately a very tight fit on the end of the crankshaft. You=0Acan use the bo=
lts to pull it into place (tightening each bolt a fraction of=0Aa turn at =
a time, in a criss-cross pattern), but I had to heat the flywheel=0A(with =
a propane torch) to get it off.=0A=0AJoe A. had some lightweight steel fly=
wheels made, but I think he sold them=0Aall and has no plans to make more.=
=0A=0AThere are instructions in the "Competition Preparation" manual for h=
ow to=0Alighten a stock flywheel. Any decent machine shop should be able t=
o do the=0Awork (but I assume will insist you sign a waiver so they can't =
be=0Aresponsible if the resulting unit breaks in operation).=0A=0AIIRC, th=
e post-50K flywheel is somewhat lighter than the earlier one. I=0Adon't kn=
ow how the TR4A flywheel compares to either of the early ones, but=0Ait mi=
ght be slightly lighter still. The 4A clutch is lighter (I'm also=0Ausing =
a 4A clutch).=0A=0AIt's worth noting, perhaps, that weight distribution is=
important too; what=0Awe really want to minimize is rotational inertia. S=
o weight near the rim=0Ahas much more effect than weight near the center.=0A=
=0AYou also might want to think about what happens if, for example, you mi=
ss a=0Ashift and the flywheel breaks from centrifugal force. Serious racer=
s=0Ainstall extra shielding to (hopefully) protect them if the worst happe=
ns.=0A=0A-- Randall =0A=0A** triumphs@autox.team.net **=0A=0ADonate: http:=
//www.team.net/donate.html=0AArchive: http://www.team.net/pipermail/triump=
hs http://www.team.net/archive=0A=0AUnsubscribe/Manage: http://autox.team.=
net/mailman/options/triumphs/ryel@mac.com=0A
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<html><body><div>This is the flywheel I bought for my TR3A. </div><div><a
href=3D=
"https://www.bpnorthwest.com/alloy-light-flywheel-tr2-tr3-tr4-tr4a.html";>h=
ttps://www.bpnorthwest.com/alloy-light-flywheel-tr2-tr3-tr4-tr4a.html</a><=
/div><div>I've had no issues killing the car when starting in 1st gear, it=
's still very forgiving. And yes, the engine spins up nice and quick power=
ed with 87.5 big bore kit.</div><div><br data-mce-bogus=3D"1"></div><div c=
lass=3D"x-apple-signature">Rye<br>PH: 530-FIND-RYE</div><div><br>On Sep 11=
, 2018, at 05:23 AM, Randall <tr3driver@ca.rr.com> wrote:<br><br></d=
iv><div><blockquote type=3D"cite"><div class=3D"msg-quote"><div class=3D"_=
stretch"><span class=3D"body-text-content"><blockquote type=3D"cite" class=
=3D"quoted-plain-text">do they make a lighter flywheel? What about Aluminu=
m?</blockquote><br>Fidanza offers an alloy flywheel (with a replaceable st=
eel insert for the<br>friction surface). <br><br>I've been running one for=
perhaps 15 years now; and I like the overall<br>effect. Makes the car muc=
h more nimble at low speeds (mostly in 1st gear).<br><br>However, it did h=
ave a very definite effect (for me) on launching the car<br>(initial accel=
eration from a standstill); behind two different engines. Not<br>hard to c=
ope with, but even after all these years I still have to think<br>about it=
to avoid killing the engine. And I still occasionally do kill it,<br>usua=
lly when I'm just puttering around and thinking about something else.<br><=
br>Also, it is deliberately a very tight fit on the end of the crankshaft.=
You<br>can use the bolts to pull it into place (tightening each bolt a fr=
action of<br>a turn at a time, in a criss-cross pattern), but I had to hea=
t the flywheel<br>(with a propane torch) to get it off.<br><br>Joe A. had =
some lightweight steel flywheels made, but I think he sold them<br>all and=
has no plans to make more.<br><br>There are instructions in the "Competit=
ion Preparation" manual for how to<br>lighten a stock flywheel. Any decent=
machine shop should be able to do the<br>work (but I assume will insist y=
ou sign a waiver so they can't be<br>responsible if the resulting unit bre=
aks in operation).<br><br>IIRC, the post-50K flywheel is somewhat lighter =
than the earlier one. I<br>don't know how the TR4A flywheel compares to ei=
ther of the early ones, but<br>it might be slightly lighter still. The 4A =
clutch is lighter (I'm also<br>using a 4A clutch).<br><br>It's worth notin=
g, perhaps, that weight distribution is important too; what<br>we really w=
ant to minimize is rotational inertia. So weight near the rim<br>has much =
more effect than weight near the center.<br><br>You also might want to thi=
nk about what happens if, for example, you miss a<br>shift and the flywhee=
l breaks from centrifugal force. Serious racers<br>install extra shielding=
to (hopefully) protect them if the worst happens.<br><br>-- Randall <br><=
br>** <a href=3D"mailto:triumphs@autox.team.net"; data-mce-href=3D"mailto:t=
riumphs@autox.team.net">triumphs@autox.team.net</a> **<br><br>Donate: <a h=
ref=3D"http://www.team.net/donate.html"; data-mce-href=3D"http://www.team.n=
et/donate.html">http://www.team.net/donate.html</a><br>Archive: <a href=3D=
"http://www.team.net/pipermail/triumphs"; data-mce-href=3D"http://www.team.=
net/pipermail/triumphs">http://www.team.net/pipermail/triumphs</a> <a href=
=3D"http://www.team.net/archive"; data-mce-href=3D"http://www.team.net/arch=
ive">http://www.team.net/archive</a><br><br>Unsubscribe/Manage: <a href=3D=
"http://autox.team.net/mailman/options/triumphs/ryel@mac.com"; data-mce-hre=
f=3D"http://autox.team.net/mailman/options/triumphs/ryel@mac.com";>http://a=
utox.team.net/mailman/options/triumphs/ryel@mac.com</a><br></span></div></=
div></blockquote></div></body></html>
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** triumphs@autox.team.net **
Archive: http://www.team.net/pipermail/triumphs http://www.team.net/archive
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