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Bill,
I didn't mean the noise when going from acceleration to overrun and vice
versa : this is caused by the clearance between pinion and crownwheel and I
agree that in a racecar this clearance should be wider than in a road car. I
did mean the noise caused by the teeth making contact and gliding over each
other : this should be quiet I believe.
Marcel.
_____
Van: Bill Babcock [mailto:ponobill@gmail.com]
Verzonden: vrijdag 12 augustus 2016 19:22
Aan: Marcel Van Mulders
Onderwerp: Re: [Fot] IRS Diff Cover
Easy to do, the equation for crown wheel and pinion seems to be heat is
inversely proportional to noise. I get them centered as much as my patience
will permit and run twice the specified clearance. Don't remember what that
is. But i do remember the disaster I had running at spec. the oil was
smoking after just a few warmup laps. good thing it was a test and tune day.
On Aug 12, 2016, at 12:41 AM, Marcel Van Mulders
<van.mulders.marcel@telenet.be> wrote:
Some years ago, I tried a new 4.33 pinion and crownwheel : after a road
test, the differential housing was already very very hot. No way to race
with that. It was installed correctly and running quiet.Returning to the
original 4.1 pinion and crownwheel in the same casing and the same LSD
solved this problem. The temperature of the diff is a result of how much
heat is generated and how much heat is transferred to the air. Probably an
overheating diff can also be caused by too much heat that is generated? LSD
of course, but also the heat generated by the pinion and crownwheel because
of some fault of the parts or the installation.
Marcel
_____
Van: Fot [mailto:fot-bounces@autox.team.net] Namens malaboge@aol.com
Verzonden: woensdag 10 augustus 2016 05:37
Aan: pvucinic@netspace.net.au; fot@autox.team.net
Onderwerp: Re: [Fot] IRS Diff Cover
Nope, no chance of the exhaust...or anything else that might be hot back
there. The heat looked like it came from the diff cover out to the poly
bush. The bush was melted the most on the back edge where the cover had the
biggest mass next to the bushing.
And this is with a Detroit locker, no heat building clutches inside!
-----Original Message-----
From: Peter Vucinic <pvucinic@netspace.net.au>
To: malaboge <malaboge@aol.com>
Sent: Tue, Aug 9, 2016 5:45 am
Subject: Re: [Fot] IRS Diff Cover
Wow! Melted poly mounts! Never seen that before! Sure it's not the exhaust
systems proximity to the differential casing that's adding to the equation?
Regards
Peter Vucinic
On 9 Aug 2016, at 11:55 AM, malaboge@aol.com wrote:
Oh I'm so jealous of that finned alum diff cover!
BUT, a more practical question...do you think the most oil capacity, or
directed internal oil dispersion is more important. (Already using RedLine
heavy shock proof oil).
Some history...
The Duke of Oil, our 4A has melted a set of the poly mounts (see a previous
pic someone else submitted...same deal here) in a normal sprint race. So,
diggin thru the pile-o-parts I find I have an early one piece TR6(?) diff
cover that is pretty much a square reservoir in the back (the oil reservoir
area looks about like the reservoir on the 2 piece 4A diff cover), and
another later (?) one piece cover that directs the oil flingin around in the
diff toward the ring gear and has more fins on it. However, the later more
heavily finned unit holds about 8 ounces less fluid, but it directs the oil
directly onto the gear and has those additional fins.
I would really like to skip the oil pump and cooler setup in the back of the
car, but may have to go that way anyhow.
BUT,
Has anyone had any experience with running the later, smaller oil capacity
but more finned and directed oil units? And how would it compare to the
larger open chamber cover?
If not, who has installed a pump and cooler back there? What did you use for
a cooler and where did you put the outlet and inlet on the diff...and why?
Usually in hot water myself...this time oil!
Nick in Nor Cal
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com <http://www.fot-racing.com/>
Archive: http://www.team.net/archive
http://autox.team.net/mailman/options/fot/pvucinic@netspace.net.au
_______________________________________________
fot@autox.team.net
http://www.fot-racing.com
Archive: http://www.team.net/archive
http://autox.team.net/mailman/options/fot/bill@ponostyle.com
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<META name=3DGENERATOR content=3D"MSHTML 11.00.10586.545"></HEAD>
<BODY=20
style=3D"WORD-WRAP: break-word; -webkit-nbsp-mode: space; =
-webkit-line-break: after-white-space">
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D159555818-12082016>Bill,</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D159555818-12082016>I didn't mean the noise when going from =
acceleration to=20
overrun and vice versa : this is caused by the clearance between pinion =
and=20
crownwheel and I agree that in a racecar this clearance should be wider =
than in=20
a road car. I did mean the noise caused by the teeth making contact and =
gliding=20
over each other : this should be quiet I believe.</SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D159555818-12082016>Marcel.</SPAN></FONT></DIV><BR>
<DIV lang=3Dnl class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>Van:</B> Bill Babcock =
[mailto:ponobill@gmail.com]=20
<BR><B>Verzonden:</B> vrijdag 12 augustus 2016 19:22<BR><B>Aan:</B> =
Marcel Van=20
Mulders<BR><B>Onderwerp:</B> Re: [Fot] IRS Diff =
Cover<BR></FONT><BR></DIV>
<DIV></DIV>Easy to do, the equation for crown wheel and pinion seems to =
be heat=20
is inversely proportional to noise. I get them centered as much as my =
patience=20
will permit and run twice the specified clearance. Don’t remember =
what that is.=20
But i do remember the disaster I had running at spec. the oil was =
smoking after=20
just a few warmup laps. good thing it was a test and tune day.
<DIV><BR></DIV>
<DIV><BR>
<DIV>
<BLOCKQUOTE type=3D"cite">
<DIV>On Aug 12, 2016, at 12:41 AM, Marcel Van Mulders <<A=20
=
href=3D"mailto:van.mulders.marcel@telenet.be";>van.mulders.marcel@telenet.=
be</A>>=20
wrote:</DIV><BR class=3DApple-interchange-newline>
<DIV>
<META name=3DGENERATOR content=3D"MSHTML 11.00.10586.545">
<DIV>
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D561542107-12082016>Some years ago, I tried a new =
4.33 pinion and=20
crownwheel : after a road test, the differential housing was =
already=20
very very hot. No way to race with that. It was installed=20
correctly and running quiet.Returning to the original 4.1 =
pinion and=20
crownwheel in the same casing and the same LSD solved this =
problem. The=20
temperature of the diff is a result of how much heat is generated and =
how much=20
heat is transferred to the air. Probably an overheating diff can =
also be=20
caused by too much heat that is generated? LSD of course, but also the =
heat=20
generated by the pinion and crownwheel because of some fault of =
the parts=20
or the installation. </SPAN></FONT></DIV>
<DIV dir=3Dltr align=3Dleft><FONT color=3D#0000ff size=3D2 =
face=3DArial><SPAN=20
class=3D561542107-12082016>Marcel</SPAN></FONT></DIV><BR>
<DIV lang=3Dnl class=3DOutlookMessageHeader dir=3Dltr align=3Dleft>
<HR tabIndex=3D-1>
<FONT size=3D2 face=3DTahoma><B>Van:</B> Fot [<A=20
=
href=3D"mailto:fot-bounces@autox.team.net";>mailto:fot-bounces@autox.team.=
net</A>]=20
<B>Namens </B><A=20
=
href=3D"mailto:malaboge@aol.com";>malaboge@aol.com</A><BR><B>Verzonden:</B=
>=20
woensdag 10 augustus 2016 05:37<BR><B>Aan:</B> =
pvucinic@netspace.net.au;=20
fot@autox.team.net<BR><B>Onderwerp:</B> Re: [Fot] IRS Diff=20
Cover<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV style=3D"FONT-SIZE: 14pt; FONT-FAMILY: 'comic sans ms', =
sans-serif">
<DIV style=3D"FONT-SIZE: 10pt; FONT-FAMILY: arial, helvetica, =
sans-serif">Nope,=20
no chance of the exhaust...or anything else that might be hot back =
there. The=20
heat looked like it came from the diff cover out to the poly bush. The =
bush=20
was melted the most on the back edge where the cover had the biggest =
mass next=20
to the bushing.<BR>And this is with a Detroit locker, no heat building =
clutches inside!<BR><BR><BR>-----Original Message-----<BR>From: Peter =
Vucinic=20
<<A=20
=
href=3D"mailto:pvucinic@netspace.net.au";>pvucinic@netspace.net.au</A>>=
<BR>To:=20
malaboge <<A=20
href=3D"mailto:malaboge@aol.com";>malaboge@aol.com</A>><BR>Sent: =
Tue, Aug 9,=20
2016 5:45 am<BR>Subject: Re: [Fot] IRS Diff Cover<BR><BR></DIV>
<DIV id=3DAOLMsgPart_2_c1cd206c-8102-4239-8de1-7431b3b8f0ca>
<DIV class=3DaolReplacedBody>
<DIV>Wow! Melted poly mounts! Never seen that before! Sure it's not =
the=20
exhaust systems proximity to the differential casing that's adding to =
the=20
equation?<BR><BR>Regards=20
<DIV>Peter Vucinic</DIV></DIV>
<DIV><BR>On 9 Aug 2016, at 11:55 AM, <A =
href=3D"mailto:malaboge@aol.com"=20
target=3D_blank>malaboge@aol.com</A> wrote:<BR><BR></DIV>
<BLOCKQUOTE type=3D"cite">
<DIV>
<DIV style=3D"FONT-SIZE: 14pt; FONT-FAMILY: 'comic sans ms', =
sans-serif">Oh=20
I'm so jealous of that finned alum diff cover!<BR>BUT, a more =
practical=20
question...do you think the most oil capacity, or directed internal =
oil=20
dispersion is more important. (Already using RedLine heavy shock =
proof=20
oil).<BR>Some history...<BR>The Duke of Oil, our 4A has melted a set =
of the=20
poly mounts (see a previous pic someone else submitted...same deal =
here)=20
in a normal sprint race. So, diggin thru the pile-o-parts I =
find I=20
have an early one piece TR6(?) diff cover that is pretty much a =
square=20
reservoir in the back (the oil reservoir area looks about like the =
reservoir=20
on the 2 piece 4A diff cover), and another later (?) one piece cover =
that=20
directs the oil flingin around in the diff toward the ring gear and =
has more=20
fins on it. However, the later more heavily finned unit holds about =
8 ounces=20
less fluid, but it directs the oil directly onto the gear and has =
those=20
additional fins. <BR><BR>I would really like to skip the oil pump =
and cooler=20
setup in the back of the car, but may have to go that way=20
anyhow.<BR><BR>BUT,<BR>Has anyone had any experience with running =
the later,=20
smaller oil capacity but more finned and directed oil units? And how =
would=20
it compare to the larger open chamber cover?<BR><BR>If not, who has=20
installed a pump and cooler back there? What did you use for a =
cooler and=20
where did you put the outlet and inlet on the diff...and =
why?<BR><BR>Usually=20
in hot water myself...this time oil!<BR><BR>Nick in Nor=20
Cal<BR></DIV></DIV></BLOCKQUOTE>
<BLOCKQUOTE type=3D"cite">
=
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<A =
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