Re: [Fot] GT6 Crankshaft

[Scott Janzen via Fot <fot@autox.team.net>]

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Also, going back to the TR6 vs GT6 design, they both used the same =
connecting rods to save money.  They also essentially have the same =
block (same dimensions, anyway, though the TR6 block is heavier and has =
bulges on the manifold side). Because the TR6 has a stroker crank, the =
same pistons as the GT6 would end up colliding with the head. So, they =
raised the wrist pin height on the TR6 pistons to adjust for the stroke =
difference. =20
Jason is right on the advantages.  Piston cost should be the same - not =
sure if rods will cost more as they may be truly custom, versus what=E2=80=
=99s available for these engines. Maybe it=E2=80=99s worth it?

On Dec 6, 2021, at 10:38 AM, Jason Sukey via Fot <fot@autox.team.net> =
wrote:

Hi PJ,
         In theory, the closer the wrist pin is to the top of the =
piston, the more stable the piston is in the bore; the rings will seal =
better.  And the piston can be shorter with less mass.

Longer rods lead to less thrust loading of the piston against the =
cylinder wall.  Less friction for more power and less wear.=20

There's also the argument of rod length to stroke ratio, but I doubt we =
are making enough change here to count this as a benefit.

I can't say exactly how much power it's really worth, .... but if you =
are ordering custom pistons and rods anyways, it doesn't add any cost to =
make them "better".

Jason

On Mon, Dec 6, 2021 at 10:32 AM McKearn McKearn <mckearn2@gmail.com =
Can you explaine the longer rods and TR6 pistons to me please?
                            Thanks. P.J.

On Mon, Dec 6, 2021 at 12:51 AM Geoff Byrne via Fot <fot@autox.team.net =
You don=E2=80=99t need a billet crank in the 2litre motor mine revs to 8 =
but what you do need are 9 mm longer rods and then use TR 6 pistons=20
Geoff Byrne , TR racer down under

Sent from my iPad

> On 6 Dec 2021, at 2:41 pm, Jason Sukey via Fot <fot@autox.team.net =
>=20
> =EF=BB=BF
> One more vote for a properly prepared stock crank. Mine is balanced =
and nitrided, but with a stock "damper".  No issues reving safely north =
of 7,000.  Auxiliary oiling to the front main bearings is a must for =
high rpm.
>=20
> I have Pauter rods,  a little heavier than Carillo's, but have larger =
bolts.   (5/16" vs 1/4" if I remember correctly)=20
>=20
> I'm running Venolia forged pistons, they work well but have since gone =
out of business.
>=20
> If you are going the custom rods/custom pistons route,  consider =
having the pistons made with a shorter compression height than stock, =
and longer rods to match.
>=20
> Jason
>=20
> On Sun, Dec 5, 2021, 10:25 PM Scott Janzen via Fot <fot@autox.team.net =
> I run a stock crank, crack tested, balanced, nitrided, with a =
vibration damper - no problem revving into the sevens, consistently.  =
I=E2=80=99m not sure you need billet on a GT6.  Never had a bottom end =
failure.
> Rods - Carillo - only drawback is little tiny bolts that need to be =
torqued by stretch gauge.  If you use the wrong lube on them you can =
overtorque them easily, and the little buggers cost about $40 each (ask =
me how I know).
> Pistons - I=E2=80=99ve had good luck with Wiseco making them for me - =
reasonable price, good specs, will make them any way you want them.
>=20
> On Dec 5, 2021, at 10:18 PM, McKearn McKearn via Fot =
>=20
> Hi all.
>  Am looking for info on GT6 billet crankshafts.  Also looking for =
opinions on connecting rods and forged pistons.  Starting with the =
bottom end this time..
>                              Thanks . P.J.
> _______________________________________________
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<html><head><meta http-equiv=3D"Content-Type" content=3D"text/html; =
charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; =
-webkit-nbsp-mode: space; line-break: after-white-space;" class=3D"">Also,=
 going back to the TR6 vs GT6 design, they both used the same connecting =
rods to save money. &nbsp;They also essentially have the same block =
(same dimensions, anyway, though the TR6 block is heavier and has bulges =
on the manifold side). Because the TR6 has a stroker crank, the same =
pistons as the GT6 would end up colliding with the head. So, they raised =
the wrist pin height on the TR6 pistons to adjust for the stroke =
difference. &nbsp;<div class=3D"">Jason is right on the advantages. =
&nbsp;Piston cost should be the same - not sure if rods will cost more =
as they may be truly custom, versus what=E2=80=99s available for these =
engines. Maybe it=E2=80=99s worth it?<br class=3D""><div><br =
class=3D""><div class=3D"">On Dec 6, 2021, at 10:38 AM, Jason Sukey via =
Fot &lt;<a href=3D"mailto:fot@autox.team.net"; =
class=3D"">fot@autox.team.net</a>&gt; wrote:</div><br =
class=3D"Apple-interchange-newline"><div class=3D""><div dir=3D"ltr" =
class=3D"">Hi PJ,<div class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp;In =
theory, the closer the wrist pin is to the top of the piston, the more =
stable the piston is in the bore; the rings will seal better.&nbsp; And =
the piston can be shorter with less mass.</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">Longer rods =
lead to less thrust loading of the piston against the cylinder =
wall.&nbsp; Less friction for more power and less wear.&nbsp;</div><div =
dir=3D"auto" class=3D""><br class=3D""></div><div class=3D"">There's =
also the argument of rod length to stroke ratio, but I doubt we are =
making enough change here to count this as a benefit.</div><div =
dir=3D"auto" class=3D""><br class=3D""></div><div dir=3D"auto" =
class=3D"">I can't say exactly how much power it's really worth, .... =
but if you are ordering custom pistons and rods anyways, it doesn't add =
any cost to make them "better".</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div class=3D"">Jason</div></div><br class=3D""><div =
class=3D"gmail_quote"><div dir=3D"ltr" class=3D"gmail_attr">On Mon, Dec =
6, 2021 at 10:32 AM McKearn McKearn &lt;<a =
href=3D"mailto:mckearn2@gmail.com"; class=3D"">mckearn2@gmail.com</a>&gt; =
wrote:<br class=3D""></div><blockquote class=3D"gmail_quote" =
style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div dir=3D"ltr" class=3D"">Can you =
explaine the longer rods and TR6 pistons to me please?<div =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; Thanks. P.J.</div></div><br =
class=3D""><div class=3D"gmail_quote"><div dir=3D"ltr" =
class=3D"gmail_attr">On Mon, Dec 6, 2021 at 12:51 AM Geoff Byrne via Fot =
&lt;<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank" =
class=3D"">fot@autox.team.net</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div dir=3D"auto" class=3D"">You =
don=E2=80=99t need a billet crank in the 2litre motor mine revs to 8 but =
what you do need are 9 mm longer rods and then use TR 6 =
pistons&nbsp;<div class=3D"">Geoff Byrne , TR racer down under<br =
class=3D""><br class=3D""><div dir=3D"ltr" class=3D"">Sent from my =
iPad</div><div dir=3D"ltr" class=3D""><br class=3D""><blockquote =
type=3D"cite" class=3D"">On 6 Dec 2021, at 2:41 pm, Jason Sukey via Fot =
&lt;<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank" =
class=3D"">fot@autox.team.net</a>&gt; wrote:<br class=3D""><br =
class=3D""></blockquote></div><blockquote type=3D"cite" class=3D""><div =
dir=3D"ltr" class=3D"">=EF=BB=BF<div dir=3D"auto" class=3D""><div =
class=3D"">One more vote for a properly prepared stock crank. Mine is =
balanced and nitrided, but with a stock "damper".&nbsp; No issues reving =
safely north of 7,000.&nbsp; Auxiliary oiling to the front main bearings =
is a must for high rpm.</div><div dir=3D"auto" class=3D""><br =
class=3D""></div><div dir=3D"auto" class=3D"">I have Pauter rods,&nbsp; =
a little heavier than Carillo's, but have larger bolts.&nbsp; =
&nbsp;(5/16" vs 1/4" if I remember correctly)&nbsp;</div><div dir=3D"auto"=
 class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">I'm =
running Venolia forged pistons, they work well but have since gone out =
of business.</div><div dir=3D"auto" class=3D""><br class=3D""></div><div =
dir=3D"auto" class=3D"">If you are going the custom rods/custom pistons =
route,&nbsp; consider having the pistons made with a shorter compression =
height than stock, and longer rods to match.</div><div dir=3D"auto" =
class=3D""><br class=3D""></div><div dir=3D"auto" class=3D"">Jason<br =
class=3D""><br class=3D""><div class=3D"gmail_quote" dir=3D"auto"><div =
dir=3D"ltr" class=3D"gmail_attr">On Sun, Dec 5, 2021, 10:25 PM Scott =
Janzen via Fot &lt;<a href=3D"mailto:fot@autox.team.net"; target=3D"_blank"=
 class=3D"">fot@autox.team.net</a>&gt; wrote:<br =
class=3D""></div><blockquote class=3D"gmail_quote" style=3D"margin:0px =
0px 0px 0.8ex;border-left:1px solid =
rgb(204,204,204);padding-left:1ex"><div class=3D"">I run a stock crank, =
crack tested, balanced, nitrided, with a vibration damper - no problem =
revving into the sevens, consistently.&nbsp; I=E2=80=99m not sure you =
need billet on a GT6.&nbsp; Never had a bottom end failure.<div =
class=3D"">Rods - Carillo - only drawback is little tiny bolts that need =
to be torqued by stretch gauge.&nbsp; If you use the wrong lube on them =
you can overtorque them easily, and the little buggers cost about $40 =
each (ask me how I know).</div><div class=3D"">Pistons - I=E2=80=99ve =
had good luck with Wiseco making them for me - reasonable price, good =
specs, will make them any way you want them.<br class=3D""><div =
class=3D""><br class=3D""><div class=3D"">On Dec 5, 2021, at 10:18 PM, =
McKearn McKearn via Fot &lt;<a href=3D"mailto:fot@autox.team.net"; =
rel=3D"noreferrer" target=3D"_blank" class=3D"">fot@autox.team.net</a>&gt;=
 wrote:</div><br class=3D""><div class=3D""><div dir=3D"ltr" class=3D"">Hi=
 all.<div class=3D"">&nbsp;Am looking for info on GT6 billet =
crankshafts.&nbsp; Also looking for opinions on connecting rods and =
forged pistons.&nbsp; Starting with the bottom end this time..</div><div =
class=3D"">&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; =
&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;Thanks . =
P.J.</div></div>
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