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(1) 2 »

Re: Engine, Tach, and Speedster Questions
#1
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Ron Schuman
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I have a 1930 320 cu in 90 HP 8 (according to the engine numbers and owners manual) and want to know the normal operating rpm range so I can find a proper tachometer. I am also looking for the appropriate tach. First time here, anyone else building a Packard speedster? Basing mine on a '28 526 (126 in WB) chassis. Found the '30 straight 8 and 4 speed and installed it. Kept all the wheel base and moved the motor/trans back 18 inches and down 1.5 inches. Moved the steering and crossmembers as required and in the process of building the body bucks for the 2 seater boattail body. The object is to use all period Packard parts (mechanical brakes, stock steering, etc.) as might have been used by a period long distance racer and when its finished drive the hell out of it.
Ron Schuman

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Posted on: 2009/1/2 12:24
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Re: Engine, Tach, and Speedster Questions
#2
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Ozstatman
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Quote:
RAS wrote: I have a 1930 320 cu in 90 HP 8.........First time here, anyone else building a Packard speedster? Basing mine on a '28 526 (126 in WB) chassis..........Ron Schuman

G'day Ron,
to Packardinfo. You're not alone in building a Speedster, have a look at Turbopackman's in the Project Blog Forum:
http://packardinfo.com/xoops/html/modules/newbb/viewtopic.php?topic_id=738&forum=10
There was also a discussion a little while ago with another member who has one.
And another matter, although - Could you please add your Speedster to the Owner Registry together with a pic, any known history and how you acquired it?

Posted on: 2009/1/2 14:20
Mal
/o[]o\
====

Bowral, Southern Highlands of NSW, Australia
"Out of chaos comes order" - Nietzsche.

1938 Eight Touring Sedan - SOLD

1941 One-Twenty Club Coupe - SOLD

1948 Super Eight Limo, chassis RHD - SOLD

1950 Eight Touring Sedan - SOLD

What's this?
Put your Packard in the Packard Vehicle Registry!
Here's how!
Any questions - PM or email me at ozstatman@gmail.com
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Re: Engine, Tach, and Speedster Questions
#3
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Owen_Dyneto
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Would be helpful to know the tire size and rear axle ratio. Here's some factory data for 1931 with 6.50x19 tires and 4.69 rear axle.

20 mph = 985 rpm
50 mph = 2463 rpm
70 mph = 3448 rpm
90 mph = 4423 rpm.

For the 4.38 rear axle, same tire size:

20 mph = 920 rpm
50 mph = 2302 rpm
70 mph = 3222 rpm
90 mph = 4142 rpm.

By just measuring your tire circumference and knowing the axle ratio you can work out any combination you want. I guess you know that a 5 inch stroke and babbitt bearings aren't conducive to long engine life at much above 2500 rpm or so.

Posted on: 2009/1/2 15:02
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Re: Engine, Tach, and Speedster Questions
#4
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Ozstatman
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Quote:
Ozstatman wrote:.......There was also a discussion a little while ago with another member who has one........

Found it, there are three posts from Turbo289 on Page 8 of Turbopackman's Project Blog and mentions the Speedster he's building in Nampa Idaho.

Posted on: 2009/1/3 3:13
Mal
/o[]o\
====

Bowral, Southern Highlands of NSW, Australia
"Out of chaos comes order" - Nietzsche.

1938 Eight Touring Sedan - SOLD

1941 One-Twenty Club Coupe - SOLD

1948 Super Eight Limo, chassis RHD - SOLD

1950 Eight Touring Sedan - SOLD

What's this?
Put your Packard in the Packard Vehicle Registry!
Here's how!
Any questions - PM or email me at ozstatman@gmail.com
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Re: Engine, Tach, and Speedster Questions
#5
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Eric Boyle
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I would look for a 5000 rpm tach, which is what I'm also looking for. Something like this would probably be perfect for you, even though it's only 4000 rpm, I don't think you'd ever top it out: Vintage Tach

Posted on: 2009/1/3 12:51
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Re: Engine, Tach, and Speedster Questions
#6
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Ron Schuman
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Thank you,
Looks like it will make for some interesting reading.,
ras

Posted on: 2009/1/3 16:40
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Re: Engine, Tach, and Speedster Questions
#7
Just can't stay away
Just can't stay away

Ron Schuman
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Owen,
Thanks for the info. This Packard stuff is all new to me and thats the kind of info I need to steer this project. If I want to cruise at anything over 50 it looks like I'll need a set of high speed gears.

Posted on: 2009/1/3 16:46
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Re: Engine, Tach, and Speedster Questions
#8
Just can't stay away
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Ron Schuman
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Thanks Eric,
Looking forward to reading about your speedster project.,
ras

Posted on: 2009/1/3 16:49
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Re: Engine, Tach, and Speedster Questions
#9
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Ozstatman
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Ron,
for adding your Speedster to the Owner Registry. And thanks also for the history and such, I enjoy these as they make interesting reading.

And I suggest, some here might think I'm pushy but what the heck I can only ask, could you document your Speedster in the Project Blogs Forum? I'm sure it will provide a great resource for others who may wish to do something similar. As well as provide you and us with regular documented updates of progress achieved.

Posted on: 2009/1/3 21:42
Mal
/o[]o\
====

Bowral, Southern Highlands of NSW, Australia
"Out of chaos comes order" - Nietzsche.

1938 Eight Touring Sedan - SOLD

1941 One-Twenty Club Coupe - SOLD

1948 Super Eight Limo, chassis RHD - SOLD

1950 Eight Touring Sedan - SOLD

What's this?
Put your Packard in the Packard Vehicle Registry!
Here's how!
Any questions - PM or email me at ozstatman@gmail.com
 Top  Print 
 


Re: Engine, Tach, and Speedster Questions
#10
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Jim
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Ron wrote: "...320 cu in 90 HP 8 (according to the engine numbers and owners manual) and want to know the normal operating rpm range..."

Ron,

Good question. I also wonder what maximum sustained rpm is healthy for these engines. I have a 39 320 that seems very unhappy if pushed over what seems like about 2100 - 2200 rpm. These engines make lots of torque. I currently have 4.36 : 1 gearing with overdrive (28% overdrive ratio) for a final drive ratio of 3.14 : 1. With 7.00 - 16 Firestones that are approx. 30 inches tall. The car seems very pleasant at 60 mph. I honestly believe it would pull taller gearing with no trouble at all. I look to drop to 4.09 : 1 rear gears giving a final ratio of 2.94 : 1.

Owen is spot on about the babbited connecting rod bearings being of concern in your engine. As light as your speedster will be, I would gear it to the moon if you want to go over 60 mph for sustained periods.

I would be very curious to hear other opinions from experienced operators of 320 8 cyl. engines on max. sustained rpm.

Your project looks very interesting.

Best of luck,
Jim

Posted on: 2009/1/4 1:19
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