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I have built solid mounts for my engine that locate it a little more than an
inch lower (the stock pan is parallel with the bottom of the frame) and used
a urethane mount for the transmission. Anyone had experience with this? Am I
asking for trouble? I've been using that configuration for about ten races.
A little harsh for the street, but I don't break mounts any more.
-----Original Message-----
From: R. KASTNER [mailto:kaskas@earthlink.net]
Sent: Thursday, March 25, 1999 10:16 AM
To: DLMAssoc@AOL.COM
Cc: fot@autox.team.net
Subject: Re: The Good, the Bad and the Ugly
Indeed we had problems with the transmission/bellhousing cracking, but,
remember we were using the engine and CAR at the highest amount of
usage, I.E. high revs for at least thirty to forty-five minute races.
This is 6500 revs for a good long time.As you have surmised there is a
method of aiding the situation,the mounts, and indeed this does help.
We did make mounts that supported the junction of the engine to the
transmission. We used small rubber engine mounts with long strap iron
brackets that came down to the bell housing bolts and the mounts were on
each side of the battery box. This did make a positive difference. But,
we never had this problem until we started making real power, that is
above 150 BHP. We broke at least ten or fifteen of the gearbox housings
until we made the hangers with rubber mounts . We still cracked the
casings , but the whole business at least held togeather for the length
of the event. At one time I also welded side plates onto the the gearbox
case but they also cracked. This was probably because they were very
soft after being annealed by the welding. I think I might have worried a
lot of people without cause for most will probably NEVER use the cars
and engines as hard as we did at that time. I'll try to answer any
comments on this.
DLMAssoc@aol.com wrote:
> FOTers:
>
> The discussion of bell housing breakage in early TR4s is very timely for
me...
> I'm ready to put one in a car but have stopped till I figure out what to
do to
> minimize the possibility of cracking.
>
> Kas has explained about the "gong" device they used to use, and Nick (at
least
> I think it was Nick) has recommended welding braces from the bell housing
to
> the tranny. Another "old" TR racer I talked to today said the problem was
> probably caused by the combination of engine and tranny flexing, since
they
> were supported only by the front motor mounts and the tranny mount at the
> rear. Without support in the middle, the flexing would break the bell
> housing. He said he used to install motor mounts at the rear of the
engine to
> eliminate the flex. This seems to make sense, but I wonder if anyone else
has
> done this or is there some reason this wouldn't take care of it.
>
> Thanks...
> Don Marshall
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<TITLE>RE: The Good, the Bad and the Ugly</TITLE>
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<P><FONT SIZE=3D2>I have built solid mounts for my engine that locate =
it a little more than an inch lower (the stock pan is parallel with the =
bottom of the frame) and used a urethane mount for the transmission. =
Anyone had experience with this? Am I asking for trouble? I've been =
using that configuration for about ten races. A little harsh for the =
street, but I don't break mounts any more.</FONT></P>
<P><FONT SIZE=3D2>-----Original Message-----</FONT>
<BR><FONT SIZE=3D2>From: R. KASTNER [<A =
HREF=3D"mailto:kaskas@earthlink.net";>mailto:kaskas@earthlink.net</A>]</F=
ONT>
<BR><FONT SIZE=3D2>Sent: Thursday, March 25, 1999 10:16 AM</FONT>
<BR><FONT SIZE=3D2>To: DLMAssoc@AOL.COM</FONT>
<BR><FONT SIZE=3D2>Cc: fot@autox.team.net</FONT>
<BR><FONT SIZE=3D2>Subject: Re: The Good, the Bad and the Ugly</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>Indeed we had problems with the =
transmission/bellhousing cracking, but,</FONT>
<BR><FONT SIZE=3D2>remember we were using the engine and CAR at the =
highest amount of</FONT>
<BR><FONT SIZE=3D2>usage, I.E. high revs for at least thirty to =
forty-five minute races.</FONT>
<BR><FONT SIZE=3D2>This is 6500 revs for a good long time.As you have =
surmised there is a</FONT>
<BR><FONT SIZE=3D2>method of aiding the situation,the mounts, and =
indeed this does help. </FONT>
<BR><FONT SIZE=3D2>We did make mounts that supported the junction of =
the engine to the</FONT>
<BR><FONT SIZE=3D2>transmission. We used small rubber engine mounts =
with long strap iron</FONT>
<BR><FONT SIZE=3D2>brackets that came down to the bell housing bolts =
and the mounts were on</FONT>
<BR><FONT SIZE=3D2>each side of the battery box. This did make a =
positive difference. But,</FONT>
<BR><FONT SIZE=3D2>we never had this problem until we started making =
real power, that is</FONT>
<BR><FONT SIZE=3D2>above 150 BHP. We broke at least ten or fifteen of =
the gearbox housings</FONT>
<BR><FONT SIZE=3D2>until we made the hangers with rubber mounts . We =
still cracked the</FONT>
<BR><FONT SIZE=3D2>casings , but the whole business at least held =
togeather for the length</FONT>
<BR><FONT SIZE=3D2>of the event. At one time I also welded side plates =
onto the the gearbox</FONT>
<BR><FONT SIZE=3D2>case but they also cracked. This was probably =
because they were very</FONT>
<BR><FONT SIZE=3D2>soft after being annealed by the welding. I think I =
might have worried a</FONT>
<BR><FONT SIZE=3D2>lot of people without cause for most will probably =
NEVER use the cars</FONT>
<BR><FONT SIZE=3D2>and engines as hard as we did at that time. I'll try =
to answer any</FONT>
<BR><FONT SIZE=3D2>comments on this.</FONT>
</P>
<BR>
<P><FONT SIZE=3D2>DLMAssoc@aol.com wrote:</FONT>
</P>
<P><FONT SIZE=3D2>> FOTers:</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>> The discussion of bell housing breakage in =
early TR4s is very timely for me...</FONT>
<BR><FONT SIZE=3D2>> I'm ready to put one in a car but have stopped =
till I figure out what to do to</FONT>
<BR><FONT SIZE=3D2>> minimize the possibility of cracking.</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>> Kas has explained about the "gong" =
device they used to use, and Nick (at least</FONT>
<BR><FONT SIZE=3D2>> I think it was Nick) has recommended welding =
braces from the bell housing to</FONT>
<BR><FONT SIZE=3D2>> the tranny. Another "old" TR =
racer I talked to today said the problem was</FONT>
<BR><FONT SIZE=3D2>> probably caused by the combination of engine =
and tranny flexing, since they</FONT>
<BR><FONT SIZE=3D2>> were supported only by the front motor mounts =
and the tranny mount at the</FONT>
<BR><FONT SIZE=3D2>> rear. Without support in the middle, the =
flexing would break the bell</FONT>
<BR><FONT SIZE=3D2>> housing. He said he used to install motor =
mounts at the rear of the engine to</FONT>
<BR><FONT SIZE=3D2>> eliminate the flex. This seems to make =
sense, but I wonder if anyone else has</FONT>
<BR><FONT SIZE=3D2>> done this or is there some reason this wouldn't =
take care of it.</FONT>
<BR><FONT SIZE=3D2>></FONT>
<BR><FONT SIZE=3D2>> Thanks...</FONT>
<BR><FONT SIZE=3D2>> Don Marshall</FONT>
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