--===============1721110754782341005==
boundary="----=_Part_3123821_137064286.1577713560046"
------=_Part_3123821_137064286.1577713560046
Content-Transfer-Encoding: quoted-printable
Hi,
I can say with authority that advancing the cam will help a bit, but it won=
't result in gobs of power. Note that you must have a proper cam gear to do=
this, some on the market are not drilled properly limiting the amount of "=
change" you can make. Adjustable cam gears give you more adjustability and =
hence allowing you to optimize the cam on the dyno. BUT accessing the gear =
on the dyno is pretty hard to do, so we tend to stick with what has worked =
in the past with various cams. All that said, you will likely find a few to=
rques if you advance the cam up to about 4 degrees. Retarding the cam does =
NOTHING GOOD. Regarding tuning,=C2=A0 you want torque, not HP. Trust me on =
that. Side story: I had a late TR6 with really low power, the former owner =
spent scads of $$$ trying to get the car to run right. After I verified the=
basics, I was able to determine that the cam was retarded. A LOT. Intake w=
as opening ATDC. I fixed that and got over more 30 HP to the wheels. Cam ti=
ming does make a difference!
I got around 100 HP to the wheels with stock late cam (advanced 4 degrees),=
header, mild porting and a free-flow exhaust. The biggest gain: ditch the =
crank-driven fan. 8 HP. You could probably get another one or two by underd=
riving the alternator, but I've never done that. This was an SCCA "Street P=
repared" car with stock compression, pretty much no internal mods and balan=
cing. If you want real power, you can only get there with higher compressio=
n or boosting. Period.
The 5 main idea is good, but we would also suggest / recommend nitriding th=
e crank no matter what. Stock rods work great when properly prepared, but y=
ou can increase reliability by going to aftermarket rods that are lighter. =
Carillos are e$pen$ive but are also over 110 grams lighter than prepared st=
ock rods. There are cheaper alternatives to Carillo, but they come with som=
e risk. But over 100 grams: That's a LOT of both rotational and reciprocati=
ng mass and that will help for your killer harmonics. Note that 6300 is onl=
y one of them. The key is not staying at the killer RPMs - you need to not =
get there or go beyond them.
That's enough for now. ;-)
C ya,Bob Lang
p.s. the chart below is backwards - advancing a cam opens it EARLIER than t=
he published numbers (and retarding opens the valves later. For a stock lat=
e TR6 cam, try to open intake at around 22 BTDC. But the REAL number to go =
for is the lobe center, move that towards TDC to advance the cam. The stock=
cam lob center is around 110 ATDC, so make that less than 110 and your're =
good to go.
On Monday, December 30, 2019, 5:30:29 AM EST, Robert Perry via 6pack <6=
pack@autox.team.net> wrote: =20
=20
Hello All,
Since there is talk about modifications of their vehicles, has anyone tried=
to advance or retard the stock camshaft? I know why bother just change it.
The camshaft tooth degree is 8.57 (360 /42 teeth) with half tooth being 4.2=
8 degrees. So that would be=20
2.14 crankshaft degrees. Therefore advancing the camshaft a half tooth in =
crankshaft degrees=20
would be the following;
10/50 50/10 becomes 7.86/47.86 47.86/7.86
18/58 58/18 becomes 15.86/55.86 55.86/15.86
35/65 65/35 becomes 32.86/62.86 62.86/32.86
=C2=A0and if one retards the camshaft
10/50 50/10 becomes 12.14/52.14 52.14/12.14
18/58 58/18 becomes 20.14/60.14 60.14/20.14=20
35/65 65/35 becomes 37.14/62.86 62.86/37.14
Regards,
Robert
_______________________________________________
Archive: http://www.team.net/archive
6pack@autox.team.net
http://autox.team.net/mailman/listinfo/6pack
r6@yahoo.com
=20
------=_Part_3123821_137064286.1577713560046
Content-Transfer-Encoding: quoted-printable
<html><head></head><body><div class=3D"ydp961f228fyahoo-style-wrap" style=
=3D"font-family: Helvetica Neue, Helvetica, Arial, sans-serif; font-size: 1=
3px;"><div></div>
<div dir=3D"ltr" data-setdir=3D"false">Hi,</div><div dir=3D"ltr" da=
ta-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">I can =
say with authority that advancing the cam will help a bit, but it won't res=
ult in gobs of power. Note that you must have a proper cam gear to do this,=
some on the market are not drilled properly limiting the amount of "change=
" you can make. Adjustable cam gears give you more adjustability and hence =
allowing you to optimize the cam on the dyno. BUT accessing the gear on the=
dyno is pretty hard to do, so we tend to stick with what has worked in the=
past with various cams. All that said, you will likely find a few torques =
if you advance the cam up to about 4 degrees. Retarding the cam does NOTHIN=
G GOOD. Regarding tuning, you want torque, not HP. Trust me on that. =
Side story: I had a late TR6 with really low power, the former owner spent =
scads of $$$ trying to get the car to run right. After I verified the basic=
s, I was able to determine that the cam was retarded. A LOT. Intake was ope=
ning ATDC. I fixed that and got over more 30 HP to the wheels. Cam timing d=
oes make a difference!<br></div><div dir=3D"ltr" data-setdir=3D"false"><br>=
</div><div dir=3D"ltr" data-setdir=3D"false">I got around 100 HP to the whe=
els with stock late cam (advanced 4 degrees), header, mild porting and a fr=
ee-flow exhaust. The biggest gain: ditch the crank-driven fan. 8 HP. You co=
uld probably get another one or two by underdriving the alternator, but I'v=
e never done that. This was an SCCA "Street Prepared" car with stock compre=
ssion, pretty much no internal mods and balancing. If you want real power, =
you can only get there with higher compression or boosting. Period.</div><d=
iv dir=3D"ltr" data-setdir=3D"false"><br></div><div dir=3D"ltr" data-setdir=
=3D"false">The 5 main idea is good, but we would also suggest / recommend n=
itriding the crank no matter what. Stock rods work great when properly prep=
ared, but you can increase reliability by going to aftermarket rods that ar=
e lighter. Carillos are e$pen$ive but are also over 110 grams lighter than =
prepared stock rods. There are cheaper alternatives to Carillo, but they co=
me with some risk. But over 100 grams: That's a LOT of both rotational and =
reciprocating mass and that will help for your killer harmonics. Note that =
6300 is only one of them. The key is not staying at the killer RPMs - you n=
eed to not get there or go beyond them.</div><div dir=3D"ltr" data-setdir=
=3D"false"><br></div><div dir=3D"ltr" data-setdir=3D"false">That's enough f=
or now. ;-)<br></div><div dir=3D"ltr" data-setdir=3D"false"><br></div><div =
dir=3D"ltr" data-setdir=3D"false">C ya,</div><div dir=3D"ltr" data-setdir=
=3D"false">Bob Lang</div><div dir=3D"ltr" data-setdir=3D"false"><br></div><=
div dir=3D"ltr" data-setdir=3D"false">p.s. the chart below is backwards - a=
dvancing a cam opens it EARLIER than the published numbers (and retarding o=
pens the valves later. For a stock late TR6 cam, try to open intake at arou=
nd 22 BTDC. But the REAL number to go for is the lobe center, move that tow=
ards TDC to advance the cam. The stock cam lob center is around 110 ATDC, s=
o make that less than 110 and your're good to go.<br></div><div><br></div>
=20
</div><div id=3D"ydpca4d004dyahoo_quoted_8709648701" class=3D"ydpca=
4d004dyahoo_quoted">
<div style=3D"font-family:'Helvetica Neue', Helvetica, Arial, s=
ans-serif;font-size:13px;color:#26282a;">
=20
<div>
On Monday, December 30, 2019, 5:30:29 AM EST, Robert Pe=
rry via 6pack <6pack@autox.team.net> wrote:
</div>
<div><br></div>
<div><br></div>
<div><div id=3D"ydpca4d004dyiv4021707000"><div><div style=
=3D"font-size:13px;color:rgb(0, 0, 0);font-family:arial, sans-serif;">Hello=
All,<br><br>Since there is talk about modifications of their vehicles, has=
anyone tried to advance or retard the stock camshaft? I know why bother j=
ust change it.<br><br><pre class=3D"ydpca4d004dyiv4021707000msgPlainWrap">T=
he camshaft tooth degree is 8.57 (360 /42 teeth) with half tooth being 4.28=
degrees. So that would be <br>2.14 crankshaft degrees. Therefore advancin=
g the camshaft a half tooth in crankshaft degrees <br>would be the followin=
g;
10/50 50/10 becomes 7.86/47.86 47.86/7.86
18/58 58/18 becomes 15.86/55.86 55.86/15.86<br><br>35/65 65/35 becomes 32.8=
6/62.86 62.86/32.86<br><br> and if one retards the camshaft
10/50 50/10 becomes 12.14/52.14 52.14/12.14
18/58 58/18 becomes 20.14/60.14 60.14/20.14 <br><br>35/65 65/35 becomes 37.=
14/62.86 62.86/37.14<br><br>Regards,<br><br>Robert<br></pre><br><br><br><di=
v id=3D"ydpca4d004dyiv4021707000elnk_signature_1577701574684" style=3D"font=
-weight:normal;font-style:normal;text-decoration:none;font-size:10pt;font-f=
amily:arial, sans-serif;color:black;"><pre></pre></div><br><br><br><div id=
=3D"ydpca4d004dyiv4021707000elnk_signature_1577701611235" style=3D"font-wei=
ght:normal;font-style:normal;text-decoration:none;font-size:10pt;font-famil=
y:arial, sans-serif;color:black;"><pre></pre></div><br><br><br><div id=3D"y=
dpca4d004dyiv4021707000elnk_signature_1577701681010" style=3D"font-weight:n=
ormal;font-style:normal;text-decoration:none;font-size:10pt;font-family:ari=
al, sans-serif;color:black;"><pre></pre></div><br><br></div></div>
</div>_______________________________________________<br>Support Team.Net <=
a href=3D"http://www.team.net/donate.html"; rel=3D"nofollow" target=3D"_blan=
k">http://www.team.net/donate.html</a><br>Suggested annual donation $=
12.96<br>Archive: <a href=3D"http://www.team.net/archive"; rel=3D"nofollow" =
target=3D"_blank">http://www.team.net/archive</a><br>Forums: <a href=3D"htt=
p://www.team.net/forums" rel=3D"nofollow" target=3D"_blank">http://www.team=
.net/forums</a><br><br><a href=3D"mailto:6pack@autox.team.net"; rel=3D"nofol=
low" target=3D"_blank">6pack@autox.team.net</a><br><a href=3D"http://autox.=
team.net/mailman/listinfo/6pack" rel=3D"nofollow" target=3D"_blank">http://=
autox.team.net/mailman/listinfo/6pack</a><br><br>Unsubscribe/Manage: <a hre=
f=3D"http://autox.team.net/mailman/options/6pack/robertlangtr6@yahoo.com"; r=
el=3D"nofollow" target=3D"_blank">http://autox.team.net/mailman/options/6pa=
ck/robertlangtr6@yahoo.com</a><br><br></div>
</div>
</div></body></html>
------=_Part_3123821_137064286.1577713560046--
--===============1721110754782341005==
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
_______________________________________________
Archive: http://www.team.net/archive
6pack@autox.team.net
http://autox.team.net/mailman/listinfo/6pack
--===============1721110754782341005==--
|