Guys,
I am not sure why everyone wants to say that the gearing in the 74's
was taller than in the 75's.
If the rear end ratios are 3.15:1 for the 75's and 3.54:1 for the
74's then the 75's have the taller ratio. As for overall ratio i find
it hard to believe that a 4 speed manual has taller gearing than a 3
speed automatic (especially if the cruising rpm in the 75 auto is less
than the 74 4spd.) and therefore the 74 should have a low overall
gearing and a definate advantage in 1/4 mile times (but may run out of
gear for top end)
A shorter gear will be faster than the taller gear (as long as it is
not too short). (The 3.54:1 w/4spd should not be too short.)
Assuming that the 74 had more horsepower and better gearing (and
should have been approximately the same weight) it really should have
been much faster (in the 1/4 mile and on the roll but maybe not top
end).
If the 75's were really faster there must have been a real
shortcoming of the 360 AMC motors like a very short torque curve or no
horsepower after 4400 rpm (as mentioned below). The Windsor appears to
have a good torque curve from the numbers below.
Note: 75 - 284 lb-ft @2200, 185 hp @3800, pulls to 5000 rpm
74 - 315 lb-ft @3100, 220 hp @4400, does not pull after 4400
rpm.
I am not biased as i have a 75. Of course it has not seen the road
in over 10 years.
Jamie
* Jamie Olenick olenick@ssims.nci.nih.gov
* "I'd rather be rich than stupid" J.H.
-----Original Message-----
From: Greg Monfort [SMTP:wingracer@email.msn.com]
Sent: Tuesday, January 06, 1998 11:56 AM
To: thomas m. benvie; bricklin@autox.team.net
Subject: Re: Does 74 out perform 75?
>Comparisons: 1974 1975
>Engine AMC 360 4bbl Ford 351 Windsor 2bbl
>Net Brake Horsepower 220 at 4400RPM 175 at 3800RPM
>Torque 315 at 3100RPM
>Compression Ratio 8.25:1 8.1:1
>Rear Axlw Ratio 3.15:1
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
'74s have 3.54:1 per R&T test. Windsor torgue: 284 @ 2200rpm.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>
>I got this info from a 75 Bricklin sales brochure and the 74
AMC technical
>Service Manual. do not know what the 74 Bricklin had for a
rearend ratio,
>but the 3.15:1 would have been the AMC car line rear for an
automatic, and
>3.54:1 for the standard. The 351 Cleveland Ford engine with a
4 bbl is a
>very potent engine, as was the Boss 351, but the 2bbl 351
Windsor was just
>a run of the mill engine,
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
Yes, from the Granada/Monarch.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
and more often than not replaced with one of
>Fords other powerplants by serious racers, such as the Mustang
guys.
>
>I find it hard to believe this Ford engine would outperform the
AMC (in
>spite of my AMC biases). If I remember correctly, the 360
Javelins were
>running low 14 second quarters,
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
R&T ('74) 17.8 @ 82mph / 1/4 mi. Top speed 111.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
while the 351 Windsor Mustangs were mid 15s
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
C&D ('75) 16.6 @ 83.6mph / 1/4 mi. Top speed 118. In
acceleration the '75
was a clear winner from over a second @ 30mph and maintaining
the gap, and
them some, all the way to 90mph. The main problem besides
slightly taller
overall gearing for the '74 was it wouldn't pull past 4400rpm
(for whatever
reason), while the '75 would pull to 5000rpm.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>(and with a 4 bbl)
>
>If you really want to improve a 74, all AMC blocks from 290-401
are exactly
>the same, just a different bore and stroke. The cranks are
different from
>72 up due to AMC using the Torquflite trans (which is way
better than, and
>replaced, the Borg Warner AMC used for 71 and before. This is
the same
>tranny Ford called the FMX, and used in 75 Bricklins). So find
a 401
>engine (even in Jeep Wagoneers), cylinder heads from 70 360 or
390 4 bbl
>engines, or 71 360 401 4bbl engines. These are high compression
(10.2:1)
>and very big valves. The AMC guys like the Edelbrock Torquer
intake, and a
>Holley no bigger than a 750. The free flow exhaust manifolds
used on the
>Bricklins are just as good as headers. There are all sorts of
cam grinds
>available. The 727 Torqueflite tranny made by Chrysler, used
by AMC and
>Bricklin, has numerous hop up items available. AMC rearend
ratios are
>available up to 5.00:1. The stock brake setup is adequate for
these
>modifications. I have a stock 69 AMX pulling low 13s, and a
factory Super
>Stock car capable of low 10s, high 9s, and a Funny Car...well,
I don't know
>yet. My plan when I owned #323 was to do the above mods.
>
>Anyone with AMC questions, feel free to ask.
>>>>>>>>>>>>>>
Thanks for the info.
GM
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