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On Wed, Jun 10, 2015 at 11:48 AM, Patrick Huckels <
bespokeroadsters@yahoo.com> wrote:
> In my quest to understand the different engine configurations with the
> TR250, 5 and TR6's, I have learned much about the variances in both the Feb
> (carbed) and the PI changes made over the model years. Primary changes were
> crankshafts, camshafts and cylinder heads along with their associated bits
> and bobs. Also distributor changes were made but I am not sure as to their
> relationship with compression ratios and HP.
> I would like everyone to look over what I understand and either confirm
> that I'm on the right track or off the most traveled path.
> Here's what I have so far
> *Fed/US carbureted cars*
> 1968-1971 Compression ratio of 9.5:1 Rated HP of 104
> 1972-1973 Compression ratio of 7.75:1 Rated HP of 106 Increased HP due to
> ????????
> 1974-1976 Compression ratio of 7.5:1 Rated HP of 101
> *PI Cars*
> 1968-1975 Compression ratio of 9.5:1 Rated HP of 150
> Any feedback is welcome.
>
Horsepower of the PI cars was reduced from 150 to 125 somewhere around 1972.
The torque ratings of the US cars should be part of the discussion, along
with the rpm's that the peak horsepower and torque readings were attained.
The peak numbers alone only tell part of the story.
Irv Korey
74 TR6 CF2276U
Highland Park, IL
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<div dir=3D"ltr"><br><div class=3D"gmail_extra"><br><div class=3D"gmail_quo=
te">On Wed, Jun 10, 2015 at 11:48 AM, Patrick Huckels <span dir=3D"ltr"><=
;<a href=3D"mailto:bespokeroadsters@yahoo.com"; target=3D"_blank">bespokeroa=
dsters@yahoo.com</a>></span> wrote:<br><blockquote class=3D"gmail_quote"=
style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><d=
iv><div style=3D"color:#000;background-color:#fff;font-family:HelveticaNeue=
,Helvetica Neue,Helvetica,Arial,Lucida Grande,sans-serif;font-size:12px"><d=
iv dir=3D"ltr">In my quest to understand the different engine configuration=
s with the TR250, 5 and TR6's, I have learned much about the variances =
in both the Feb (carbed) and the PI changes made over the model years. Prim=
ary changes were crankshafts, camshafts and cylinder heads along with their=
associated bits and bobs. Also distributor changes were made but I am not =
sure as to their relationship with compression ratios and HP.=C2=A0</div><d=
iv dir=3D"ltr">I would like everyone to look over what I understand and eit=
her confirm that I'm on the right track or off the most traveled path.<=
/div><div dir=3D"ltr">Here's what I have so far</div><div dir=3D"ltr"><=
b>Fed/US carbureted cars</b></div><div dir=3D"ltr">1968-1971 Compression ra=
tio of 9.5:1 Rated HP of 104</div><div dir=3D"ltr">1972-1973 Compression ra=
tio of 7.75:1 Rated HP of 106 Increased HP due to ????????</div><div dir=3D=
"ltr">1974-1976 Compression ratio of 7.5:1 Rated HP of 101</div><div dir=3D=
"ltr"><b>PI Cars</b><br></div><div dir=3D"ltr">1968-1975 Compression ratio =
of 9.5:1 Rated HP of 150</div><div dir=3D"ltr">Any feedback is welcome.<br>=
</div></div></div></blockquote></div><br></div><div class=3D"gmail_extra">H=
orsepower of the PI cars was reduced from 150 to 125 somewhere around 1972.=
<br><br></div><div class=3D"gmail_extra">The torque ratings of the US cars =
should be part of the discussion, along with the rpm's that the peak ho=
rsepower and torque readings were attained. The peak numbers alone only tel=
l part of the story. <br><br></div><div class=3D"gmail_extra">Irv Korey<br>=
</div><div class=3D"gmail_extra">74 TR6 CF2276U <br></div><div class=3D"gma=
il_extra">Highland Park, IL<br></div></div>
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